| 摘要 |
PROBLEM TO BE SOLVED: To provide a bonding method and the resulting bonding structure in which when three or more sheets including dissimilar metals to be bonded are layered and bonded by resistance welding, even in a combination of the materials where a dissimilar material interface and the same material interface are mixed and where heating in the dissimilar material interface becomes smaller than that in the same material interface due to the difference of contact resistance between both interfaces, a nugget of desired size can be formed in each interface while inhibiting a decrease in thickness of a material at a low melting point side and bonding strength of each interface can be secured. SOLUTION: A first current is conducted between a three-sheet layered plate materials wherein an aluminum alloy plate 1, a zinc plated steel plate 2 and a bare steel plate 3 are layered in this order. A nugget Ns is preferentially formed in an interface between the zinc plated steel plate 2 and the bare steel plate 3, which are the same materials. Then, a second current greater than the first current is conducted, and a nugget Nd is formed in an interface between the aluminum alloy plate 1 and the zinc plated steel plate 2, which are dissimilar materials. COPYRIGHT: (C)2009,JPO&INPIT |
