在不同焊接工艺参数下对780DP钢和DC04普碳钢进行窄搭接焊接试验,研究了焊接工艺参数对两种钢焊接接头质量的影响.结果表明:焊接过程中热输入量过大和过小分别会造成焊瘤和未焊透两种典型焊接缺陷,其杯突试验裂缝均平行焊缝；焊接质量对电极轮压力的变化最为敏感,对焊接电流和焊接速度的敏感性依次减弱；由于受焊接热循环作用,焊接接头热影响区和焊缝区组织变化较大；焊缝区和热影响区的硬度相对于母材有所提高；当搭接量为1.7 mm、传动侧焊接补偿为0.4 mm、碾压轮压力为40 kN时,焊接的最佳工艺参数为焊接电流16 kA、焊接速度7 m·min-1、电极轮压力15 kN.
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