汽车用DP800双相钢点焊工艺窗口和接头性能  

Spot welding parameter window and joint properties of automotive DP800 dual-phase steel

作　　者：孙希庆[1] 高朝乾[1] 张武[2] 计遥遥[2] 刘东亚 XUN Xiqing;GAO Caoqian;ZHANG Wu;JI Yaoyao;LIU Dongya(Geely Automobile Research Institute Co.,Ltd.,Ningbo 315000,China;Technology Center,MAANSHAN Iron & Steel Co.,Ltd.,Maanshan 243000,China)

机构地区：[1]浙江吉利汽车研究院有限公司,浙江宁波315000 [2]马鞍山钢铁股份有限公司技术中心,安徽马鞍山243000

出　　处：《电焊机》2017年第12期59-62,共4页Electric Welding Machine

摘　　要：开展2.0 mm厚DP800双相钢的电阻点焊试验,测试DP800双相钢点焊工艺窗口,研究焊接电流、焊接时间、电极压力对焊点拉剪力的影响规律,并观察接头不同区域的微观组织。结果表明,DP800高强钢焊接性较好,点焊工艺窗口满足工业应用要求;随着焊接电流和焊接时间的增加,焊点直径和拉剪力先增加后趋于平稳;随着电极压力的增加,点焊直径和拉剪力先增加后减小;焊点热影响晶粒细小,由马氏体组织构成;焊核为典型的柱状晶,显微组织为马氏体和少量的贝氏体。The resistance spot welding test of2mm thick DP800dual phase steel was carried out.Spot welding parameter window of DP800dual-phase steel was measured.The influence rule of welding current,welding time and electrode pressure on the tensile and shearing force of solder joints was studied,and the microstructure of different regions of joints was observed.The results show that the weldability of DP800high strength steel is good,and the spot welding process window meets the requirements of industrial application.With the increase of welding current and welding time,the diameter and tensile strength of welding spot first increase and then become stable.With the increase of electrode pressure,the spot welding diameter and the tensile shear force firstly increase and then decrease;the heat affected grain size of the weld spot is small and consist of martensite structure;the weld core is a typical columnar crystal,the microstructure is martensite and a small amount of bainite.

关 键 词：DP800双相钢 点焊 工艺窗口 接头性能 

分 类 号：TG457.11[金属学及工艺—焊接]