焊接电流对M51/B318异种金属精密电阻焊接头质量的影响  

Effect of welding current on welding quality of M51/B318 dissimilar metal joint using resistance welding

作　　者：李远波[1] 吴德成 刘国跃 贾寓真 郭松名 LI Yuanbo;WU Decheng;LIU Guoyue;JIA Yuzhen;GUO Songming(Guangdong University of Technology,Guangzhou 510006,China;Bichamp Cutting Technology(Hunan)Co.,Ltd.,Changsha 410200,China;Sawing Engineering Research Center of Hunan Province,Changsha 410200,China)

机构地区：[1]广东工业大学,广州510006 [2]湖南泰嘉新材料股份有限公司,长沙410200 [3]湖南省高速高效双金属锯切工程技术研究中心,长沙410200

出　　处：《焊接学报》2019年第5期73-78,I0005,共7页Transactions of The China Welding Institution

基　　金：湖南省战略性新兴产业科技攻关类项目(2016GK4018);长沙市科技计划资助项目(KQ1706171)

摘　　要：文中采用精密电阻焊进行高速钢M51与高强度弹簧钢B318异种钢材焊接,着重分析了焊接电流对接头特性四个指标(接头剪断力、热影响区大小、挤出熔渣量、有无飞溅情况)的影响.结果表明,焊接电流与接头剪断力呈抛物线关系,焊接电流自900 A上升到1 300 A时,接头剪断力随之增加并达到峰值,当焊接电流达到1 400 A时,由于焊接能量过大出现熔渣飞溅现象,接头剪断力下降;随着焊接电流增加,热影响区的大小及挤出熔渣量也呈现先增大后减小的趋势.文中还结合微观组织分析了焊接电流对焊缝质量的影响机理.In this study,dissimilar steels of high speed steel M51 and high strength spring steel B318 was welded by the precision resistance welding method.The influence of welding current on four indexes of joint characteristics(shear force,heat influence zone,extrusion slag amount and splash condition)is analyzed emphatically.The results show that the welding current is in parabolic relationship with the shear force of the joint.When the welding current rises from 900 A to 1 300 A,the shear force of the joint increases to a peak value,and when the welding current reaches 1 400 A,the shear force of the joint decreases due to slag spatter result from excessive welding energy.With the increase of welding current.The size of heat affected zone and the amount of molten slag in extrusion increase firsty and then decrease.Finally,the influence of welding current on weld quality is analyzed with microstructure.

关 键 词：异种金属焊接 精密电阻焊 焊接电流 双金属带锯条 微观组织 

分 类 号：TG453.9[金属学及工艺—焊接]