ABSTRACT This paper presents an innovative approach that uses a pulse-profile to improve the welding quality of CP1180 steel in resistance spot welding process. Three pulses with two cooling times were used in the developed multi-pulse welding (MPW) schedule. The experimental results show that the first pulse increases the contact area between the sheets to improve the current flow pattern. The second pulse was designed to extend the sheet-to-sheet contact area and corona bond for preventing rapid nugget growth. Using these designs, the nugget size was maximised through the third pulse. The maximum nugget size using the designed MPW schedule was 18.5% greater than that of the single-pulse welding schedule and the weldable current range was extended by 130%.

中文翻译：

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使用多脉冲电阻点焊提高超高强度钢的熔核尺寸和可焊电流范围

摘要 本文提出了一种创新方法，该方法使用脉冲轮廓来提高 CP1180 钢在电阻点焊过程中的焊接质量。在开发的多脉冲焊接 (MPW) 计划中使用了具有两个冷却时间的三个脉冲。实验结果表明，第一个脉冲增加了片材之间的接触面积以改善电流流动模式。第二个脉冲设计用于扩大片材与片材的接触面积和电晕结合，以防止熔核快速生长。使用这些设计，通过第三次脉冲使金块尺寸最大化。使用设计的 MPW 计划的最大熔核尺寸比单脉冲焊接计划大 18.5%，可焊接电流范围扩大了 130%。