Abstract
In this paper, a three-layer structure consisting of ultra-high strength steel and high strength steel was resistance spot welded. Macro characteristics of the joint were described in terms of nugget diameter, nugget offset, penetration rate, indentation depth, the indentation diameter, and thickness thinning rate. The results show that the smallest nugget diameter is about 6.3 mm and nugget offset is ignorable. Welding parameters have discrepant influence on penetration rate. The maximum penetration rate is about 71 %. Indentation diameter ranges from 6 to 8.6 mm and increases with welding parameters. Indentation depth varies with welding parameters and reaches a maximum value 1.3 mm. Because of the delay of deformation, welding time and electrode force have little effect on thickness thinning rate when they are in relatively low level. However, thickness thinning rate increases with welding time and electrode force when they are in high level, which is like the trend in welding current. The maximum thickness thinning rate is about 33 %.
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