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  • Polymer and Materials Science  (495)
  • Inorganic Chemistry  (259)
  • Aircraft Propulsion and Power  (12)
  • 1980-1984
  • 1950-1954  (766)
  • 1951  (766)
Collection
Publisher
Years
  • 1980-1984
  • 1950-1954  (766)
Year
  • 1
    Publication Date: 2019-06-28
    Description: A comparison of the operating characteristics of 75-millimeter-bore (size 215) cylindrical-roller one-piece inner-race-riding cage-type bearings was made using a laboratory test rig and a turbojet engine. Cooling correlation parameters were determined by means of dimensional analysis, and the generalized results for both the inner- and outer-race bearing operating temperatures are compared for the laboratory test rig and the turbojet engine. Inner- and outer-race cooling-correlation curves were obtained for the turbojet-engine turbine-roller bearing with the same inner- and outer-race correlation parameters and exponents as those determined for the laboratory test-rig bearing. The inner- and outer-race turbine roller-bearing temperatures may be predicted from a single curve, regardless of variations in speed, load, oil flow, oil inlet temperature, oil inlet viscosity, oil-jet diameter or any combination of these parameters. The turbojet-engine turbine-roller-bearing inner-race temperatures were 30 to 60 F greater than the outer-race-maximum temperatures, the exact values depending on the operating condition and oil viscosity; these results are in contrast to the laboratory test-rig results where the inner-race temperatures were less than the outer-race-maximum temperatures. The turbojet-engine turbine-roller bearing, maximum outer-race circumferential temperature variation was approximately 30 F for each of the oils used. The effect of oil viscosity on inner- and outer-race turbojet-engine turbine-roller-bearing temperatures was found to be significant. With the lower viscosity oil (6x10(exp -7) reyns (4.9 centistokes) at 100 F; viscosity index, 83), the inner-race temperature was approximately 30 to 35 F less than with the higher viscosity oil (53x10(exp -7) reyns (42.8 centistokes) at 100 F; viscosity index, 150); whereas the outer-race-maximum temperatures were 12 to 28 F lower with the lower viscosity oil over the DN range investigated.
    Keywords: Aircraft Propulsion and Power
    Type: NACA-RM-E51I05
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  • 2
    Publication Date: 2019-06-28
    Description: Tests of two propellers having two blades and differing only in the inboard pitch distribution were made in the Langley 8-foot highspeed tunnel to determine the effect of inboard pitch distribution on propeller performance. propeller was designed for operation in the reduced velocity region ahead of an NACA cowling; the inboard pitch distribution of the modified propeller was increased for operation at or near free-stream velocities, such as would be obtained in a pusher installation. conditions covering climb, cruise, and high-speed operation. Wake surveys were taken behind the propellers in order to determine the distribution of thrust along the blades and to aid in the analysis of the results. Test results showed that the modified propeller was about 2.5 percent less efficient for a typical climb condition at all altitudes, 2 percent more efficient for one cruise condition, and 5 percent more efficient for high-speed operation. speed condition, the modified propeller showed a 6-percent loss in efficiency due to compressibility; whereas the original propeller showed an 11-percent efficiency loss due to compressiblity. The lower compressibility loss for the modified propeller resulted from the fact that the inboard sections of this propeller could operate at increased thrust loading after compressibility losses had occurred at the outboard sections.
    Keywords: Aircraft Propulsion and Power
    Type: NACA-TN-2268
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  • 3
    Publication Date: 2019-06-27
    Description: An experimental investigation was conducted to determine the cooling effectiveness of a wide variety of air-cooled turbine-blade configurations. The blades, which were tested in the turbine of a - commercial turbojet engine that was modified for this investigation by replacing two of the original blades with air-cooled blades located diametrically opposite each other, are untwisted, have no aerodynamic taper, and have essentially the same external profile. The cooling-passage configuration is different for each blade, however. The fabrication procedures were varied and often unique. The blades were fabricated using methods most suitable for obtaining a small number of blades for use in the cooling investigations and therefore not all the fabrication procedures would be directly applicable to production processes, although some of the ideas and steps might be useful. Blade shells were obtained by both casting and forming. The cast shells were either welded to the blade base or cast integrally with the base. The formed shells were attached to the base by a brazing and two welding methods. Additional surface area was supplied in the coolant passages by the addition of fins or tubes that were S-brazed. to the shell. A number of blades with special leading- and trailing-edge designs that provided added cooling to these areas were fabricated. The cooling effectiveness and purposes of the various blade configurations are discussed briefly.
    Keywords: Aircraft Propulsion and Power
    Type: NACA-RM-E51E23 , REPT-2203
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  • 4
    Publication Date: 2019-07-11
    Description: Strain-gages were used to measure blade vibrations causing failures in the third stage of a production 11-stage axial-flow compressor. After the serious third-stage vibration was detected, a series of investigations were conducted with second-stage vane assemblies of varying angles of incidence. Curves presented herein show the effect of varying the angle of incidence of second-stage vane assembly on third-stage rotor-blade vibration amplitude and engine performance. A minimum vibration amplitude was obtained without greatly affecting the engine performance with a second-stage vane assembly of 9deg. greater angle of incidence than the assembly normally furnished with the engine.
    Keywords: Aircraft Propulsion and Power
    Type: NACA-RM-SE51F08
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  • 5
    Publication Date: 2019-07-11
    Description: An investigation of the altitude performance characteristics of an Allison J35-A-17 turbojet engines have been conducted in an altitude chamber at the NACA Lewis laboratory. Engine performance was obtained over a range of altitudes from 20,000 to 60,000 feet at a flight Mach number of 0.62 and a range of flight Mach numbers from 0.42 to 1.22 at an altitude of 30,000 feet. The performance of the engine over the range investigated could be generalized up to an altitude of 30,000 feet. Performance of the engine at any flight Mach number in the range investigated can be predicted for those operating condition a t which critical flow exits in the exhaust nozzle with the exception of the variables corrected net thrust, and net-thrust specific fuel consumption.
    Keywords: Aircraft Propulsion and Power
    Type: NACA-RM-E50I15
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  • 6
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    In:  CASI
    Publication Date: 2019-08-13
    Description: The performance of a jet power plant consisting of a compressor and a turbine is determined by the characteristic curves of these component parts and is controllable by the characteristics of the compressor and the turbine i n relation t o each other. The normal. output, overload, and throttled load of the Jet power plant are obtained on the basis of assumed straight-line characteristics.
    Keywords: Aircraft Propulsion and Power
    Type: NACA-TM-1258
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  • 7
    Publication Date: 2019-07-11
    Description: This report presents a compilation of static sea-level data on existing or designed American and British axial-flow turbojet engines in terms of basic engine parameters such as thrust and air flow. In the data presented, changes in the over-U engine performance with time sre examined as well as the relation of the various engine parameters to each other.
    Keywords: Aircraft Propulsion and Power
    Type: NACA-RM-51K29
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  • 8
    Publication Date: 2019-07-12
    Description: Component data on the J35-A-23 compressor and two-stage turbine were used to determine the problems in matching the two units for operatio n in a turbojet engine. Possible operating regions were determined an d an equilibrium operating line was also determined for the assumed c onditions of zero flight speed and a jet nozzle area approximately 5. 5 percent greater than the wide-open nozzle area.
    Keywords: Aircraft Propulsion and Power
    Type: NACA-RM-E51H15
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  • 9
    Publication Date: 2019-07-12
    Description: A .General Electric fuel and torque regulator was tested in conjunction with a T31-3 turbine-propeller engine in the sea-level static test stand at the NACA Lewis laboratory. The engine and control were operated over the entire speed range: 11,000 rpm, nominal flight idle, to 13,000 rpm, full power. Steady-state and transient data were recorded and are presented with a description of the four control loops being used in the system. Results of this investigation indicated that single-lever control operation was satisfactory under conditions of test. Transient data presented showed that turbine-outlet temperature did overshoot maximum operating value on acceleration but that the time duration of overshoot did not exceed approximately 1 second. This temperature limiting resulted from a control on fuel flow as a function of engine speed. Speed and torque first reached their desired values 0.4 second from the time of change in power-setting lever position. Maximum speed overshoot was 3 percent.
    Keywords: Aircraft Propulsion and Power
    Type: NACA-RM-SE1H20
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  • 10
    Publication Date: 2019-07-12
    Description: At the request of the Bureau of Aeronautics, Department of the Navy, an investigation of the Westinghouse XJ34-WE-32 turbojet engine is being conducted in the NACA Lewis altitude wind tunnel to determine the steady-state and transient operating characteristics of the controlled and uncontrolled engine at various altitudes and ram pressure ratios. As part of this program, transient performance data that illustrate the operation of the engine is obtained in the form of oscillographic traces. Similar data for engine operation i n the afterburning range, covering a range of throttle settings from the minimum value giving rated speed (throttle position, 72 degrees) to full afterburning (throttle position, ll0 degrees), is presented herein. These data thus serve to indicate the transient characteristics of the engine when the throttle is advance into, withdrawn from, and moved within the afterburning range in a stepwise manner, as well as the steady-state stability of the engine during afterburning .
    Keywords: Aircraft Propulsion and Power
    Type: NACA-RM-SE50L29
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  • 11
    Publication Date: 2019-07-12
    Description: This report summarizes the effects of fuel volatility and engine design variables on the problem of starting gas-turbine engines at sea-level and altitude conditions. The starting operation for engines with tubular combustors is considered as three steps; namely, (1) ignition of a fuel-air mixture in the combustor, (2) propagation of flame through cross-fire tubes to all combustors, and (3) acceleration of the engine from windmilling or starting speed to the operating speed range. Pertinent data from laboratory researches, single-combustor studies, and full-scale engine investigations are presented on each phase of the starting problem.
    Keywords: Aircraft Propulsion and Power
    Type: NACA-RM-SE51B02
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  • 12
    Publication Date: 2019-07-12
    Description: An investigation was conducted at the NACA Lewis laboratory to determine whether simulated porous gas-turbine blades fabricated by the Eaton Manufacturing Company of Cleveland, Ohio would be satisfactory with respect to coolant flow for application in gas-turbine engines. These blades simulated porous turbine blades by forcing the cooling air onto the blade surface through a large number of chordwise openings or slits between laminations of sheet metal or wire. This type of surface has a finite number of openings, whereas a porous surface has an almost infinite number of smaller openings for the coolant flow. The investigation showed that a blade made of sheet-metal laminations stacked on a support member that passed up through the coolant passage was completely unsatisfactory because of extremely poor coolant flow distribution over the blade surface. The flow distribution for two wire-wound blades was more uniform, but the pressure drop between the coolant supply pressure and the local pressure on the outside of the blades was too low by a factor ranging from 3 to 3.5 for the required coolant flow rates. The pressure drop could be increased by forcing the wires closer together during blade fabrication.
    Keywords: Aircraft Propulsion and Power
    Type: NACA-RM-SE51C13
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  • 13
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 233-234 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 14
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 212-221 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Wetting of metals by waterIn the following own experiments and such of other authors are discussed concerning the balances of wetting of air, water and metal,  -  the explanation of which has hardly been tried so far  - , as they appear to be of importance for the basic research of the corrosion of metals. In view of the fact that their methodic has haidty been used in corrosion research, only the basic trials are demonstrated.Prior to the careful measurings of Bartell and Cardwell only more informative researches on the wetting of metals by water were made by older authors. This article, therefore, starts from the experiments on gold and silver made by Bartell and Cardwell. Own observations on mercury follow, which admit certain qualitative statements on account of the knowledge of the respective surface tension of liquid mercury. As regards other metals, among which platinum shows particularly remarkable results, only preliminary qualitative results can be discussed. They lead to some consequences concerning the question of the sort of combining power of oxygen of air to the surfaces of metals.A survey is given on the indirectly gained values of the surface tension of solid metals. These values yield together with the heats of adsorption obtained on metal catalysers a comparative measure for the different adsorption power on metal surfaces.The conclusions from the observed rivalry between the wetting by water and the adsorption of air are compared with the results of various authors on the adsorption of gases or aequous mediums on metal surfaces. Finally a hypothesis is proposed for the traceadhesion of water (Wasscr-Haftspur-Erscheinung).
    Notes: Im folgenden werden fremde und eigene Untersuchungen über Benetzungsgleichgewichte des Stofftrios: Luft, Wasser, Metall, deren Ausdeutung bisher kaum versucht wurde, zusammenfassend diskutiert, da sie für die Grundlagenforschung der Metallkorrosion von Bedeutung sein dürften. Mit Rücksicht darauf, daß ihre Methodik in der Korrosionsforschung bisher kaum Anwendung fand, werden zunächst die Verfahrens-Grund-Lagen dargelegt.Vor den sorgfältigen Messungen von Bartell und Cardwell wurden nur seitens älterer Autoren mehr orientierende Untersuchungen über die Benetzung von Metallen durch Wasser veröffentlicht. Deshalb wird von den Untersuchungen Bartells und Cardwells an Gold und Silber ausgegangen. Hieran schließen sich eigene Beobachtungen an Quecksilber, welche dank der Kenntnis der in Frage kommenden Grenzflächentensionen des flüssigen Quecksilbers gleichfalls noch gewisse quantitative Aussagen ermöglichen. Uber andere Metalle, von denen Platin besonders bemerkenswerte Erscheinungen lieferte, können nur vorläufige, qualitative Ergebnisse besprochen werden; auch ergeben sich einige Folgerungen zur Frage der Bindungsart von Luftsauerstoff an Metalloberflächen.Nach einem Überblick über indirekt erschlossene Werte der Oberflächentension fester Metalle, die neben den an Metallkatalysatoren erschlossenen Adsorptionswärmen ein Vergleichsmaß für die unterschiedliche „Adsorptionskraft“ von Metalloberflächen ergibt, werden dic Schlußfolgerungen aus der zu beobachtenden Konkurrenz von Wasserbenetzung und Luftadsorption mit Ergebnissen verschiedener Autoren über Adsorption an Metallflächen aus gasförmigem oder wäßrigem Medium verglichen. Schließlich wird für die vom Verfasser früher beschriebene Wasserhaftspurerscheinung eine Hypothese vorgeschlagen.
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  • 15
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 235-235 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 16
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 238-238 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 17
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 239-239 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 18
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951) 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 19
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 288-288 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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  • 20
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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  • 21
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951) 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 22
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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  • 23
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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  • 24
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 361-361 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 25
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    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 365-367 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Phase boundary-lines, especially in their impotance for corrosionTwo phases have a common cleavageplane, whilst three phases touch one another along a boundary line only. Corroesponding to an adsorption in the first case in an adlineation in the second case. Both processes diminish the free energy and herewith the activity of the boundary, so inhibiting the possibilities of corrosion.Local elements, glow cathodes and catalysts consisting of several components are typical systems acting at microscopic boundary-lines. Cavitation is the inverse phenomenon.Macroscopic boundary-lines in partially filled containers, formed by wall, liquor and gaseous phase, are about this especially active, as being mixed with a four-phases-point-system, that results from the heterogeneity of the container wall. Gravity potentials, and electrokinetic potentials have their maximum value in the boundary-lines too.
    Notes: Zwei Phasen haben eine gemeinsame Grenzfläche, während drei Phasen sich nur entlang einer Grenzlinie berühren. Der Adsorption im ersten Falle entspricht eine Adlineation im zweiten Falle. Beide Vorgänge setzen die freie Energie und damit die Aktivität der Grenze herab, hemmen also Korrosionsmöglichkeiten.Lokalelemente, Glühkathoden und Mehrstoff-Katalysatoren sind typische Systeme, die an mikroskopischen Grenzlinien zur Wirkung kommen. Kavitation bildet die inverse Erscheinung hierzu.Makroskopische Grenzlinien an teilgefüllten Behältern, die durch Wandung, flüssigem Inhalt und gasförmiger Phasegebildet werden, sind darüber hinaus besonders aktiv, da sie von einem Vierphasen-Punktsystem durchsetzt sind, das infolge er heterogenität der Behälterwand resultiert.Gravitationspotentiale und elektrokinetische Potentiale haben ebenfalls in den begrenzenden Linien ihren maximalen Wert.
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  • 26
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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  • 27
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 359-359 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 359-359 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 360-360 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 360-360 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 360-360 
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    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 386-393 
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    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 394-394 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 398-401 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 401-401 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 342-346 
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    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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  • 37
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 349-349 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 362-365 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Description / Table of Contents: Dissolving-speed of iron in 0,1n-hydrochloric acid1For polished test pieces of iron the increased dissolving-speed in 0,1n-hydrochloric acid in the first seconds is due to the effect of a surface-oxyde.Tests with iron pieces without surface-oxyde (reduction in hydrogen, no touching of the reduced sample with air) show an increasing of the initiating dissolving-speed as well in aqueous as in etheric hydrochloric acid, which may be explained by an increased reactivity of active iron-atoms of the surface. At coarse-field aerated test-pieces the effect of the surface-oxyde is smaller than the increased activity of the surface.The diagram of solubility of polished (surface-oxyde) samples is distinctly different to that field (surface activity) test-piecees.
    Notes: 1Bei geschliffenen Eisenproben wird die erhöhte Auflösungsgeschwindigkeit in 0,1n HCl in den ersten Sekunden auf die Wirkung eines Oberflächen-oxydes zurückgeführt.2Versuche mit Eisenproben ohne Oberflächenoxyd (Reduktion in Wasserstoff, keine Berührung der reduzierten Probe mit Luft) zeigen sowohl in wässeriger als auch in ätherischer Salzsäure eine Erhöhung der Anfangs-Lösungs-geschwindigkeit, die durch eine erhöhte Reaktionsfähigkeit aktiver Eisenatome der Oberfläche zu erklären ist. Bei grobgefeilten belüfteten Proben tritt die Wirkung des Oberflächenoxydes gegenüber der erhöhten Aktivität der Oberfläche in den Hintergrund.3Der Charakter der Lösbarkeits-kurven der geschliffenen (Oberflächenoxyd) bzw. gefeilten (Oberflächenaktivität) Proben ist deutlich verschieden.
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 401-404 
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 406-406 
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 404-405 
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 441-444 
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    Description / Table of Contents: Variation of corrosions by wetting agents. II. The influence of non-ionogen wetting agentsSurface-active substance are able to change the corroding effect of tap water on unalloyed steel in a favourable manner, as far as pitting is avoided and only removing tuberculation takes place. Non-ionogen wetting agents are more effective hereby than anion-active ones. A higher decreasing of the surface tension of the water by addition of over 4%0 of the wetting agent raises the efficacy. The chemical constitution of the used surface-active substances, however, seems to be of essential importance.
    Notes: Oberflächenaktive Stoffe können die korrodierende Wirkung von Leitungswasser auf unlegiertem Stahl insofern günstig verändern, als Lochkorrosion vermieden wird und nur noch abtragende Narbenkorrosion auftritt. Nichtionogene Netzmittel sind dabei wirksamer als anionaktive. Eine stärkere Erniedrigung der Oberflächenspannung des Wasser durch Zusatz von je 4%0 des Netzmittels erhöht die Wirkung. Die chemische Konstitution der verwendeten oberflächenaktiven Körper scheint jedoch von wesentlicher Bedeutung zu sein.
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 465-468 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 461-464 
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    Description / Table of Contents: Influence of the state of surface on the endurance bending strengthResults of endurance fatigue tests taken from literature are comparable,  -  as well known  - , only in a limited degree. One of the reasons for this disadvantageous limiting in the evaluation is to be found in the differences in the treatment of the surface of the bar. The known performance on the influence of surface qualities and treatment on the fatigue limit gives the highest value for polished surfaces of bar.In contrast hereto lately performed endurance bending tests with non-alloyed steels and brilliant-finish polished bars showed a rotating beam fatigue limit which was 57-18% lower than that on usually smoothed or polished samples. The careful treatment of those bar surfaces was practised by polishing in that manner as in preparing a “metallographic polished specimen”. About one hour of polishing resulted a high-mirror finished surface of bar, free of scratches and grooves. The microhardness of the bar surface has been lowered hereby, e. g. at Armco-iron, from 200 to 130 kg/mm2.For better comparability of results in endurance bending strength stated by different testing offices, the method of treatment of test pieces ought to be indicated.
    Notes: Versuchsergebnisse von Umlaufbiegeversuchen aus dem Schrifttum sind, wie bekannt, nur begrenzt vergleichbar. Einer der Gründe für diese nachteilige Einschränkung bei der Auswertung liegt in Verschiedenartigkeiten bei der Bearbeitung der Staboberfläche. Die bekannte Darstellung über den Einfluß der Oberflächenbeschaffenheit und Bearbeitung auf die Dauerfestigkeit gibt für polierte Staboberflächen den höchsten Wert an.Bei neuerdings durchgeführten Umlaufbiegevrsuchen mit unlegierten Werkstoffen und hochfein polierten Proben war im Gegensatz dazu die Wechselbiegefestigkeit 5-18% niedriger als bei üblich geschliffenen oder polierten Stäben. Die sorgfältige Bearbeitung der Staboberfläche erfolgte hier durch Polieren wie bei der Herstellung eines „metallographischen Schliffes“. Etwa eine Stunde Polierzeit ergab eine spiegelblanke Staboberfläche, frei von Kratzern und Riefen. Die Mikrohärte der Staboberfläche ist dadurch z. B. bei Armco-Eisen von 200 auf 130 kg/mm2 erniedrigt worden.Der Zustand der Bearbeitung von Umlaufbiegeproben sollte zur Verbesserung der Vergleichbarkeit von Ergebnissen der Wechselbiegefestigkeit von verschiedenen Prüfstellen gekennzeichnet sein.
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 478-478 
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    Notes: Schrifttum (Verkrätzung von Pb-Schmelzen, Oxydationsgesetze)  -  Untersuchung der Pb-Verkrätzung (Versuchsmethodik: Wesen und Untersuchung der Anlauffarben, Zusammensetzung der Versuchs-Reinbleisorten und Versuchs-Bleilegierungen, Durchführung der Verkrätzungsversuche, Auswertung der Zeit-Farbwechsel-Versuche, Einfluß der Temperatur auf die Dicke der Anlaufschicht)  -  Auswertung der Verkrätzungsversuche mit Reinblei  -  Primäre Oxydation von Al-, As-, Ca-, Cd-, Mg-, Sb-, Zn- und Sn-haltigem Blei; Einfluß der Oxydationstemperatur auf die Verkrätzung von Sb-, As-, Ag-, Cd-, Cu-, Hg-, Ni-, Sb-, Te-, Bi-, Al-, Sn- und Znhaltigem Blei  -  Auswertung der Verkrätzungsversuche mit Bleilegierungen (Verkrätzung von Pb—Ca-[Al]-, Pb—Te-[Sn]- und Pb—Sb-[Sn, Cu]-Legierungen)  -  Deutung der Versuchsergebnisse mit Hilfe des Volumenquotienten von Pilling und Bedworth  -  Einfluß von reinem Sauerstoff und Wasserdampf auf den Oxydationsvorgang von Sb-haltigem Blei (Versuchseinrichtung und -durchführung)  -  Verzögerung des Verkräzungsvorgangs nach mehrmaligem Entfernen der Krätze (zeitlicher Wechsel der Anlauffarben, Erfassung und Beeinfiussung der Verzögerung, das Problem der Verzögerung, Löslichkeit von O2 in der Schmelze)  -  Zusammenfassung.
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    Notes: Überprüfung und Kritik der Tödtschen „Absolutmessungen der Sauerstoffmenge durch Strommessung zwischen einer sauerstoffbeladenen Platin-Elektrode und einer unpolarisierbaren Anode“.
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 282-282 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 277-278 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 282-286 
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    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 286-286 
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    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 249-258 
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    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Description / Table of Contents: Materials of construction for the chemical industry 2nd part: Non-ferrous metalsContinuing the first part of the survey on materials of construction for the chemical industry the following matters are dealt with: Corrosion of cupper, aluminium, nickel, titanium, zirconium, tantalum, precious metals as well as their possibilities of usage in the chemical industry.
    Notes: In Fortsetzung des 1. Teiles der Übersicht über die Konstruktionswerkstoffe für die chemische Industrie werden Korrosionsverhalten von Kupfer, Aluminium, Nickel, Titan, Zirkon, Tantal und Edelmetallen sowie ihre Einsatzmöglichkeiten in der chemischen Industrie behandelt.
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 275-276 
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    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 278-278 
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    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 298-307 
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    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Corrosion resistance of aluminium bronzeA survey is given over structure, smelting, casting, mechanical-technological properties, corrosion behaviour and applications of aluminium bronzes, which represent a group of alloys consisting especially of copper and aluminium, and in the course of time being completed by other elements, as tin, nickel and manganese, for improving the qualities of the alloys and making them fit for particular requirements. A characteristic peculiarity of these bronzes is their extreme ability, by oxydation of the aluminium contained in the alloys to form thin but very close and adhering films on their surfaces, which protect the bronzes against corrosion and especially against oxydation. This ability has determined doubtless the important technical copper alloys, which show their optimal properties at middle temperatures, in that sphere their mechanical criterions being especially fit too.
    Notes: Es wird ein Überblick gegeben über Struktur, Schmelzen, Vergießen, mechanisch-technologische Eigenschaften, Korrosionsverhalten und Einsatzmöglichkeiten von Aluminiumbronzen, die eine Gruppe von Legierungen umfassen, die sich hauptsächlich aus Kupfer und Aluminium zusammensetzen und denen im Laufe der Jahre zur Steigerung ihrer Güte und Erfüllung spezieller Anforderungen noch weitere Elemente, wie Zinn, Nickel und Mangan beigefügt worden sind. Als charakteristische Besonderheit dieser Bronzen ist ihre außerordentliche Fähigkeit anzusehen, durch Oxydation des in den Legierungen enthaltenen Aluminiums dünne, jedoch sehr dichte und festhaftende Filme auf ihren Oberflächen zu bilden, die die Bronzen gegen Korrosion und vor allem gegen Oxydation schnisch wichtigsten Kupferlegierungen gemacht, die ihre optimalen Eigenschaften bei mittleren Temperaturen zeigen, da in diesem Bereich auch ihre mechanischen Kennwerte besonders günstig sind.
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 308-310 
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    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 310-313 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 346-349 
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    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 350-351 
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 355-356 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 356-357 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 357-357 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 243-249 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 258-261 
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 261-272 
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 276-277 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 278-281 
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    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 292-296 
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    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Improvements in the region of “Thermit welding”The strong affinity of aluminium to oxygen makes it possible to reduce heavy metals, e.g. iron, from their oxydes. Hereof Hans Goldschmidt evolved the alumino-thermics and the „thermit“-process.  -  The chemical and thermo-chemical principles of the thermit process are given. The iron gained from its oxydes by aluminothermic way is refuned in statu nascendi by adding steelforming components to the thermit mixture. For the thermit welding process, beside the technics of practice, the metallurgy of the thermit steel has most importance. Thermit steels of different kinds and with high qualities can be produced. Welding of streetcar- rails according to the thermit process is usual in all the world. Since more than 25 years railways, preceding the German Bundesbahn, are welding their rails to longer length and partially without spaces. A further range of application is the constructive or repairing welding of large working pieces of cast and wrougth steel.
    Notes: Die starke Affinität des Aluminiums zum Sauerstoff ermöglicht es, Schwermetalle, z. B. Eisen, aus ihren Oxyden zu reduzieren. Hieraus entwickelte Hans Goldschmidt die Aluminothermie und das „Thermit“-Verfahren. Die chemischen und thermochemischen Grundlagen des Thermit-Prozesses werden angegeben. Das auf aluminothermischem Wege aus seinen Oxyden gewonnene Eisen wird in statu nascendi durch Beigabe stahlbildender Zusätze zur Thermit-Mischung veredelt. Für das „Thermit“-Schweißverfahren ist neben der Ausführungstechnik die Metallurgie des Thermitstahles von größter Bedeutung. Man kann Thermitstähle von verschiedener Art und mit hohen Güteeigenschaften herstellen. Die Verschweißung von Straßenbahnschienen nach dem „thermit“-Verfahren ist in der ganzen Welt üblich. Seit über 25 Jahren schweißen auch Eisenbahnen, allen voran die Deutsche Bundesbahn, ihre Schienen zu größeren Längen und teilweise lückenlos zusammen. Ein weiteres Anwendungsgebiet ist die konstruktive oder instandsetzende Schweißung großer Werkstücke aus gegossenem und geschmiedetem Stahl.
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    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 313-314 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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