MIG welded joint between aluminium and steel members and MIG welding process

摘要

A MIG welded joint (10) between aluminum and steel members (12,14) is obtained by overlapping the aluminum member and the steel member each other and performing MIG welding using a filler wire (26) made of a 4000 or 5000 series aluminum alloy on an end face (16) of the overlapped aluminum member, wherein the aluminum member has a thickness P ranging from 0.5 to 2.0 mm, and the steel member has a thickness Q satisfying the following formula : 0.6 ‰¦ Q/P ‰¦ 0.8.