PROCESS FOR LAP-BONDING OF TWO METAL MEMBERS HAVING DIFFERENT MELTING POINTS

摘要

In an area where an Al alloy plate and a steel plate lap each other, a circular blank of steel plate is made to lap the Al alloy plate, and these three members are compressed by a pair of electrodes while a welding current is passed between the both electrodes. Thus melting of a current passing portion of the Al alloy plate and a neighborhood thereof, removal of the melted portion due to partial expanding deformation of the blank toward the Al alloy plate, abutting of the expanding deformed portion against the steel plate and resistance welding of the expanding deformed portion with the steel plate are successively carried out.