Accession Number : AD0872263

Title :   A Study of Pulsed Arc Welding Applied to Aerospace Alloys.

Descriptive Note : Final rept. Apr 67-Jun 69,

Corporate Author : GENERAL DYNAMICS GROTON CT ELECTRIC BOAT DIV

Personal Author(s) : Ashauer, Richard C. ; Goodman, Samuel ; Rienks, Frits ; McMaster, James A.

Report Date : DEC 1969

Pagination or Media Count : 126

Abstract : Initially it was thought that pulsing the GMA welding arc might preclude the need for stabilizing additions to the shielding gas, and that controlled one-drop-per-pulse metal transfer could be used to reduce contamination or alloy depletion that occurs with a spray (multiple-droplet) transfer welding arc. It was determined that the use of pulse arc welding did not preclude the need for arc stabilizers such as oxygen and/or carbon dioxide. Furthermore, it was shown that with a modified Vickers power supply, one-drop-per-pulse transfer could be achieved only under a very limited range of conditions, and that more suitable welding performance resulted from multiple-drop-per-pulse metal transfer. The results of mechanical and metallurgical tests showed no significant general improvements in weld quality that could be traced to pulse welding variables. Further, pulsed GMA welds were of lower quality in terms of soundness, strength, and toughness than the corresponding GTA welds.

Descriptors :   (*ARC WELDING, ALLOYS), (*INERT GAS WELDING, PULSES), STEEL, ALUMINUM ALLOYS, SHEETS, METAL PLATES, CONTAMINATION, WELDS, OXYGEN, CARBON DIOXIDE, TOUGHNESS.

Subject Categories : Metallurgy and Metallography
      Fabrication Metallurgy

Distribution Statement : APPROVED FOR PUBLIC RELEASE