Butt Joining of Aluminum to Steel by Arc Brazing Process

摘要

Butt joining of aluminum alloy to carbon steel and stainless steel was conducted by using gas tungsten arc welding process with Zn-15%A1 and Al-12%Si flux-cored filler wires, respectively. The microstructure and mechanical properties of the as-welded and post-weld heat treated joints were examined. Presetting 1.5mm-wide welding gap can promote the wetting ability of molten filler metal on the faying surfaces, and then significantly enhance the joint strength. During tensile testing, the specimens from 5A02 Al/Q235 carbon steel joint fractured in Al base metal, but those from 5A02 Al/304 stainless steel joint fractured in the weld or through the interfacial layer. Hardening effect was observed in the heat-affected zone (HAZ).