| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide the dissimilar metal welding method of a steel sheet and an aluminum alloy sheet for suppressing formation of an intermetallic compound on a weld interface, and can improve joint strength, fatigue strength and corrosion resistance, and dissimilar metal welded joint. <P>SOLUTION: When a steel sheet 1 and an aluminum alloy sheet 2 are subjected to resistance spot welding, energizing time Bt(ms) and stop time Rt(ms) are made into the conditions satisfying expressions ä2≤Bt≤10} and ä1≤Rt≤5}, pulsation energizing under pressurizing force EF(kN) is performed in the range of 2 to 8 times, after the final energizing stop for the stop time Rt(ms) is completed, immediately, the pressurizing force is increased to pressurizing force FF(kN) after the completion of the energizing satisfying an expression ä1.2×EF≤FF≤2.0×EF}, subsequently, the pressurizing is held for a holding time Ht(ms) satisfying an expression ä50≤Ht≤300}, and thereafter, the pressurizing force is unloaded. <P>COPYRIGHT: (C)2012,JPO&INPIT |
