Electron Beam Welding of High Strength Aluminum Alloy (Report I)

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It has been a general consideration that super super dulalmin, the representative of which is 7075, can not be successfully welded with conventional fusion welding method. So we have been investigating the application of EB welding process to this sort of materials. In this paper we report the penetration characteristics and the mechanical properties of 7075. Considerable differences in welding penetration phenomenon were found between alloys depending on the sort and amount of alloying element when the penetrations do not reach to the bottom of the plate thickness (partial penetration). In particular, the penetration of 7075 which contains Zn and Mg of higher vaporization pressure as principal alloying elements is much deeper than 2xxx aluminum alloys whose main alloying element is Cu. From the view point of mechanical properties, the properly EB welded 7075 exhibits tensile strength comparable to the yield strength of base metal, but the fracture mode seems to be rather brittle with small elongation. The fracture toughness of the weld, however, is superior to that of base metal.
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