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Optimization of Double-pulse Process in Resistance Spot Welding of Hot Stamped Steel Sheet

机译：热冲压钢板电阻点焊双脉冲工艺的优化

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摘要

The application of high strength steel sheets in automobile manufacturing has increased dramatically. To improve the joint performance of high strength steel sheet, an optimized RSW process was proposed. Double-pulse welding schedule was employed in the process. Under the second pulse current, the central temperature in the weld was higher than Ac3, and the second nugget was formed. The weld including two nuggets with different size and same center was obtained under the optimized process. By Vickers hardness analysis, the soft-hard alternating structure in the weld was formed. Under the same nugget size, the cross-tension strength of joints increase 30% by the optimized process. By comparison, the maximum tensile shear strength of RSW joints under dual-nugget process was higher than that under traditional heat treatment process. Furthermore, the temperature field under dual-nugget process was simulated and the weld thermal cycle of typical nodes in different weld regions were obtained. The simulation results explained the formation mechanism of the soft-hard alternating structure in the welds. The two ellipsoidal softening zones were formed respectively under different pulse welding currents.
机译：高强度钢板在汽车制造中的应用急剧增加。为了提高高强度钢板的关节性能，提出了优化的RSW工艺。在该过程中使用双脉冲焊接时间表。在第二脉冲电流下，焊缝中的中心温度高于AC3，形成第二块。在优化的过程下获得包括具有不同大小和相同中心的两个掘金的焊缝。通过维氏硬度分析，形成焊缝中的软硬交变结构。在相同的熔核尺寸下，关节的横张力强度通过优化过程增加了30％。相比之下，双核法下RSW关节的最大拉伸剪切强度高于传统热处理过程中的最大拉伸剪切强度。此外，模拟了双核靶案下的温度场，并获得了不同焊接区域中典型节点的焊接热循环。仿真结果说明了焊缝中软硬交替结构的形成机理。在不同的脉冲焊接电流下分别形成两个椭圆形软化区。

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