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  • 1
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    Chamber free fusion welding root side purging method and apparatus (1995)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A method and apparati are presented for non-chamber root side purging in fusion welding of oxygen reactive metals which require that the molten weld zone and local solid areas of the weld seam remaining at high temperatures be shielded from normal atmosphere to prevent degradation of the welded area. The apparati provide an inert atmosphere to the root side of a weld joint through a porous medium whereby the jet-like thrust of the plasma arc actually draws the continuously supplied inert atmosphere into the path of the molten or high temperature solid weld zone. The porous medium is configured so it can be placed at the borders of the weld seam and substantially parallel to the seam without restricting the view of the root side of the seam. The inert gas is dispersed evenly through the porous media and across the weld seam, at the point of arc penetration and in front of and behind the arc. The apparati can be constructed so as to limit the amount of inert gas flow and can be mobile and travel synchronously with the welding arc.
    Keywords: METALLIC MATERIALS
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Chamber free fusion welding root side purging method and apparatus (1993)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A method and apparati are presented for non-chamber root side purging in fusion welding of oxygen reactive metals which require that the molten weld zone and local solid areas of the weld seam remaining at high temperatures be shielded from normal atmosphere to prevent degradation of the welded area. The apparati provide an inert atmosphere to the root side of a weld joint through a porous medium whereby the jet-like thrust of the plasma arc actually draws the continuously supplied inert atmosphere into the path of the molten or high temperature solid weld zone. The porous medium is configured so it can be placed at the borders of the weld seam and substantially parallel to the seam without restricting the view of the root side of the seam. The inert gas is dispersed evenly through the porous media and across the weld seam, at the point of arc penetration and in front of and behind the arc. The apparati can be constructed so as to limit the amount of inert gas flow and can be mobile and travel synchronously with the welding arc.
    Keywords: METALLIC MATERIALS
    Type: NAS 1.71:MFS-28832-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Ternary gas plasma welding torch (1995)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A plasma arc welding torch is discussed. A first plasma gas is directed through the body of the welding torch and out of the body across the tip of a welding electrode disposed at the forward end of the body. A second plasma gas is disposed for flow through a longitudinal bore in the electrode. The second plasma gas enters one end of the electrode and exits the electrode at the tip thereof for co-acting with the electric welding arc to produce the desired weld. A shield gas is directed through the torch body and circulates around the head of the torch adjacent to the electrode tip.
    Keywords: MECHANICAL ENGINEERING
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    NASA TECHNICAL REPORTS
  • 4
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    Imaging The Leading Edge Of A Weld (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Proposed optical system integrated into plasma arc welding torch provides image of leading edge of weld pool and welding-arc-initiation point. Welding torch aligned better with joint. System includes coherent bundle of optical fibers and transparent cup.
    Keywords: FABRICATION TECHNOLOGY
    Type: MFS-28797 , Laser Tech. Brief.; 2; 1; P. 96
    Format: text
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  • 5
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    Plasma arc welding weld imaging (1994)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A welding torch for plasma arc welding apparatus has a transparent shield cup disposed about the constricting nozzle, the cup including a small outwardly extending polished lip. A guide tube extends externally of the torch and has a free end adjacent to the lip. First and second optical fiber bundle assemblies are supported within the guide tube. Light from a strobe light is transmitted along one of the assemblies to the free end and through the lip onto the weld site. A lens is positioned in the guide tube adjacent to the second assembly and focuses images of the weld site onto the end of the fiber bundle of the second assembly and these images are transmitted along the second assembly to a video camera so that the weld site may be viewed continuously for monitoring the welding process.
    Keywords: MECHANICAL ENGINEERING
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  • 6
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    Plasma arc welding torch having means for vortexing plasma gas exiting the welding torch (1994)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A plasma arc welding torch is described wherein a plasma gas is directed through the body of the welding torch and out of the body across the tip of the welding electrode disposed at the forward end of the body. The plasma gas is provided with a vortexing motion prior to exiting the body by a vortex motion imparting member which is mounted in an orifice housing member and carried in the forward portion of the torch body. The orifice housing member is provided with an orifice of an predetermined diameter through which the electric arc and the plasma gas exits.
    Keywords: MECHANICAL ENGINEERING
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  • 7
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    Welding Using Chilled-Inert-Gas Purging (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Report describes study of fusion welding using chilled inert gas. Marked improvement shown in welding of aluminum using chilled helium gas. Chilling inert gas produces two additional benefits: 1) creation of ultradense inert atmosphere around welds; 2) chilled gas cools metal more quickly down to temperature at which metals not reactive.
    Keywords: FABRICATION TECHNOLOGY
    Type: MFS-31010 , NASA Tech Briefs (ISSN 0145-319X); 19; 8; P. 80
    Format: text
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  • 8
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    Improved Back-Side Purge-Gas Chambers For Plasma Arc Welding (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Improved chambers for inert-gas purging of back sides of workpieces during plasma arc welding in keyhole (full-penetration) mode based on concept of directing flows of inert gases toward, and concentrating them on, hot weld zones. Tapered chamber concentrates flow of inert gas on plasma arc plume and surrounding metal.
    Keywords: FABRICATION TECHNOLOGY
    Type: MFS-31012 , NASA Tech Briefs (ISSN 0145-319X); 19; 5; P. 89
    Format: text
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  • 9
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    Swirl Ring Improves Performance Of Welding Torch (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Plasma-arc welding torch modified to create vortex in plasma gas to focus arc into narrower and denser column. Swirl ring contains four channels with angled exit holes to force gas to swirl as it flows out of torch past tip of electrode. Degradation of electrode and orifice more uniform and need to rotate torch during operation to compensate for asymmetry in arc reduced or eliminated. Used in both keyhole and nonkeyhole welding modes.
    Keywords: FABRICATION TECHNOLOGY
    Type: MFS-28828 , NASA Tech Briefs (ISSN 0145-319X); 19; 6; P. 78
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  • 10
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    Nonchamber, Root-Side, Inert-Gas Purging During Welding (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Improved apparatus distributes inert gas to protect against oxidation on root side of weld during welding and after welding while joint remains hot. Simple and lightweight; readily moved along weld path in synchronism with torch. Because it concentrates inert gas where needed, consumes gas at relatively low rate, and not necessary to monitor oxygen content of protective atmosphere. Apparatus does not obscure view of root side of weld. Used for full-penetration plasma-arc welding of such reactive metals as aluminum/lithium alloys and titanium.
    Keywords: FABRICATION TECHNOLOGY
    Type: MFS-28832 , NASA Tech Briefs (ISSN 0145-319X); 19; 5; P. 86
    Format: text
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