DP590GA热镀锌双相钢电阻点焊接头性能  

Properties of resistance spot welding joint of DP590GA hot galvanized dual-phase steel

作　　者：徐士航[1] 王敏[1] 施天寅[1] 潘华[2] 雷鸣[2] 

机构地区：[1]上海市激光制造与材料改性重点实验室上海交通大学,上海200240 [2]宝山钢铁股份有限公司技术中心,上海201900

出　　处：《电焊机》2009年第10期70-73,共4页Electric Welding Machine

摘　　要：针对热镀锌双相钢板(DP590GA)电阻点焊接头问题,研究了接头正拉和拉剪强度随焊接电流的变化规律,并与普通双相钢板(DP590)点焊接头试验结果进行了比较,同时结合两种钢板点焊熔核尺寸随焊接电流的变化以及SEM能谱分析得出的熔合区锌残留量情况,分析了影响热镀锌钢板点焊接头强度的主要原因。结果表明:当其他焊接参数一定时,DP590GA与DP590点焊接头强度和熔核尺寸随着焊接电流的变化趋势在焊接电流各个阶段有所不同,而熔核区的残留锌量随焊接电流的减小而增加,从而揭示了锌层使点焊区域接触电阻降低和焊接电流密度减小引起的熔核直径减小、熔合区残留锌量增加以及锌层更易引起点焊飞溅三个因素在不同的焊接电流范围内对点焊接头强度的影响作用。Aiming at resistance spot welding joint of hot galvanized dual-phase（DP590GA） steel,the rule of cross-tensile strength and tensile-shear strength of the joint changing with welding current are researched ,and compared with the spot-welding test result of common dual-phase plate（DP590）.Meanwhile,combining facts of spot-welding nugget diameter changing with welding current and zinc residue in fusion zone by SEM spectrum analysis ,main reasons that affect the strength of spot-welding joint of hot galvanized steel are analyzed.The results show that when other welding parameters are fixed, the trends of spot-welding joint strength and nugget diameter of DP590GA and DP590 changing with welding current differ at each current stage.And zinc residue in fusion zone increases with decreased welding current.It indicates three factors affect the strength of spot-welding joints differently at each stage.They are less nugget diameter caused by less contact resistance of spot-welding zone and welding current density because of zinc coating, increase of zinc residue in fusion zone,and zinc coating can cause splash in spot welding more easily.

关 键 词：热镀锌 双相钢 接头强度 熔核直径 镀锌层 

分 类 号：TG453.9[金属学及工艺—焊接]