Microstructure and Properties of an Al 6061/Galvanized Plate Fabricated by CMT Welding

Abstract

Aluminum alloy 6061 was welded with zinc coated low carbon steel by cold metal transfer (CMT). The microstructure composition, morphology and growth process of the welding joint and the HAZ were researched. The weld area on the side of the galvanized steel sheet mainly contains Fe₂Al₅. And on the side of the aluminum alloy substrate, it is mainly filled with a needle-like FeAl₃. At the same time, Al₈Fe₂Si is formed at the edge of FeAl₃. The zinc-rich region on the side of the aluminum alloy mainly contains an aluminum-zinc solid solution and an aluminum-zinc co-crystal, and the current size had no significant effect on the type and morphology of the compounds produced in the interface layer.

Keywords

cold metal transfer / microstructure / microhardness / dissimilar metals

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