Accession Number : ADA953841

Title :   Investigation on the Welding of High-Strength Aluminum Alloys.

Descriptive Note : Progress rept. no. 8, 1 Feb-30 Apr 49,


Personal Author(s) : Meyer,A. R. ; Williams,R. D. ; Voldrich,C. B.

Report Date : 30 APR 1949

Pagination or Media Count : 40

Abstract : The object is to develop methods for improving the strengths of joints in high-strength aluminum alloys. Welds made with ten aluminum-magnesium-zinc alloys based on the Frontier 40E composition were hot short when deposited in 24S and 75S base metal. These tests have indicated that copper pickup from the high-alloy base metal forms a low-melting complex eutectic during welding. This is thought to be the principal cause of cracking. Welds were made without cracking in 61S base metal, owing to its lower alloy content. Exploratory tests showed that sound welds could be made in all three base metals when welded with high-magnesium aluminum-base filler rods with the argon-arc process. Though the alloy modifications tested to date did not decrease hot cracking in the 40E-type weld deposits made by the argon-arc process, additional tests should be made on the effect of other welding techniques and processes upon hot cracking. The few welds made with aluminum-magnesium filler rods have had relatively high strengths with moderate ductility. Tests will be made on a series of aluminum-magnesium alloy filler rods ranging from 5 to 15 per cent magnesium, to determine whether further improvements can be attained by any of these changes in magnesium content.

Descriptors :   *Welded joints, *Aluminum alloys, *High strength alloys, *Welding, Welding rods, Fillers, Magnesium alloys, Cracking(Fracturing), Eutectics, Strength(Mechanics), Fillers, Base metal, Ductility, Welds

Subject Categories : Metallurgy and Metallography
      Fabrication Metallurgy
      Couplers, Fasteners, and Joints

Distribution Statement : APPROVED FOR PUBLIC RELEASE