To efficiently obtain a sound joining part by using arc welding without forming a fragile and thick inter-metallic compound layer in joining of dissimilar materials of an aluminum member 2a and a steel member 2b.
The method for joining the aluminum and the steel is constituted as follows. A solid wire made of an aluminum alloy, to which at least 3-15 wt% of silicon is added, is made as a welding wire 1. The aluminum member 2a, which is made of the aluminum or the aluminum alloy, and the steel member 2b, the surface of which zinc plating or aluminum plating or zinc aluminum alloy plating is applied to, are joined by pulse MIG welding. The joining part on the aluminum member 2a side is molten and joined. The joining part on the steel member 2b side is not molten but is joined by forming a thin inter-metallic compound layer.
DO KOGUN
YAZAWA ICHIZO
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