| 摘要 |
PROBLEM TO BE SOLVED: To provide a joint body of different materials by a steel material and an aluminum material and its spot welding method capable of achieving the spot welding having high welding strength. SOLUTION: In the joint body 3 of different materials of a steel material 1 and an aluminum material 2 of the specified plate thickness are welded by the spot welding. An Al<SB>5</SB>Fe<SB>2</SB>-based compound layer is provided on the steel material side, and a layer of an Al<SB>3</SB>Fe<SB>2</SB>-based compound and an Al<SB>19</SB>Fe<SB>4</SB>Si<SB>2</SB>Mn-based compound is provided on the aluminum material side of a welding interface 6 of the joint body. The mean thickness 1<SB>1</SB>in the nugget depth direction in a range of±0.1 mm around a nugget of the layer of the Al<SB>3</SB>Fe-based compound and the Al<SB>19</SB>Fe<SB>4</SB>Si<SB>2</SB>Mn-based compound is set to be 0.5-10μm to obtain the high welding strength. COPYRIGHT: (C)2007,JPO&INPIT |
