铜/钨异种金属A-TIG电 弧点焊工艺及性能研究

针对钨板轧制过程中，铜/钨接头处的连接问题，本文采用TIG对铜/钨异种金属进行焊接，分别对涂覆SiO2和未涂覆SiO2活性剂的试件进行搭接点焊，并对焊点形貌、接头截面及微观形貌和抗拉强度进行分析。结果表明，未涂覆SiO2的焊点呈凸起状，且不规则，界面结合处存在较多的孔洞缺陷，涂覆SiO2的焊点中心出现圆形凹坑，界面处孔洞等缺陷减少；接头界面处均发生了铜/钨的互扩散，涂覆SiO2的试件比未涂覆的界面更加致密；相同电流下，涂覆SiO2的接头强度比未涂覆SiO2的高，并且接头断裂位置明显不同

Research on process and performance of Cu/W dissimilar Metal welded by A-TIG arc spot welding

Due to the connection problem of Cu/W during the rolling process of tungsten plate, dissimilar metals Cu/W are welded by Tungsten inert gas(TIG) welding.In the case of coating SiO2 and uncoating SiO2 activating flux,the spot welding of W overlapped by Cu was conducted,respectively,the appearance of spot welding,cross-section,microstructure and tensile strength of joints were analyzed,respectively.The results indicate that top surface of the welding spots uncoated SiO2 are convex and irregular,many holes at the interface,in the case of coating SiO2,the center of welding spot appears round pits,the number of holes at interface reduce.Interdiffusion occurs between Cu and W,the interface of samples coated with SiO2 is more tightness than the uncoated. When the welding current is same,the strength of joint coated with SiO2 are higher than the uncoated,in the two cases of welding ,fracture exists a large different.