ISSN:
1573-8892
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Conclusions It is recommended that nondestructive methods be used to check the semifinished product in the production of tungsten wire. In particular, the elastic modulus of the bars should be determined. The clastic modulus of the semifinished product depends to a considerable extent on the presence of microcracks and the degree of cold-working of the metal: the degree of cold-working can be used to evaluate the processing characteristics of the semifinished product and predict the yield of useable products during subsequent deformation. During the initial stages of deformation of tungsten compacts, the wire semifinished product should either be placed in at least one of three groups based on elastic modulus or should be discarded as being unprofitable for further processing. Wire from grade-VA tungsten compacts with a cross section of 10.5 × 10.5 mm is most easily obtained from 7.2-mm-diam, bars with an elastic modulus in the range (410–510)·103 MPa. Such bars are best used as the semifinished products for making filament wire with a diameter 〈0.3 mm. Bars having an clastic modulus in the range (510–620)·103 MPa should be drawn to a diameter of 0.3–1.5 mm. Bars with an elaste modulus below 410·103 MPa should be used as electrodes for resistance welding (diameter 〉1.5 mm).
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02463583
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