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双相钢DP780电阻点焊工艺研究

Lun RAO,Wanpeng DONG,Yafang LIU,Pengpeng YU,Bin PAN

Hot Working Technology（2016）

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Abstract
研究了双相钢DP780的电阻点焊工艺.采用超景深显微镜和维氏硬度计等手段研究了点焊接头的微观组织和力学性能.优化试验参数为:焊接电流12kA,焊接时间10 cyc,电极压力3.5 kN.双相钢点焊接头熔核微观组织为柱状晶,主要是马氏体和少量的铁素体.在拉剪条件下,其点焊接头主要有界面撕裂和熔核剥离等失效模式.
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