FILLER METAL FOR WELDING ALUMINUM ALLOYS

摘要

Filler metal for welding AlZnMg type alloys raises the resistance to stress corrosion without increasing the susceptibility to exfoliation corrosion. The composition of the filler metal includes a copper addition which suppresses weld boundary corrosion while additions of manganese, titanium, chromium and zirconium inhibit weld cracking. High weld strengths are attained using the said filler metal. In particular the filler metal consists essentially of in weight %: zinc from 1.0 to 4.0%; magnesium from 2.0 to 5.0%; copper from 0.2 to 0.5%; manganese from 0.3 to 0.5%; titanium from 0.05 to 0.2%; chromium from 0.05 to 0.3%; zirconium from 0.05 to 0.2%; and the balance aluminum.