摘要
采用钨极惰性气体焊(TIG)对铜/钨异种金属进行焊接,分别对涂覆SiO_2和未涂覆SiO_2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拉力进行分析。结果表明,未涂覆SiO_2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SiO_2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SiO_2的试件比未涂覆的界面更加致密;相同电流下,涂覆SiO_2的接头拉力比未涂覆SiO_2的高,并且接头断裂位置明显不同。
Dissimilar metals Cu/W were welded by Tungsten Inert Gas(TIG).In the case of coating SiO2 activating flux and uncoating SiO2,the spot welding of W overlapped by Cu was conducted,and the appearance of spot welding,cross-section,microstructure and tensile strength of joints were analyzed.The results indicate that top surface of the welding spots without SiO2 are convex and irregular,and there are many holes at the interface.In the case of coating SiO2,however,the center of the welding spot exhibits round pits,and the number of holes at interface declines.Interdiffusion occurs between Cu and W,and the interface of samples coated with SiO2 is tighter than that of the uncoated.When the welding current is the same,the strength of SiO2-coated joint is higher than that of the uncoated.In addition,fracture appears at markedly different positions in the two cases of welding.
作者
顾玉芬
邓志然
石玗
李广
张刚
Gu Yufen;Deng Zhiran;Shi Yu;Li Guang;Zhang Gang(State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2019年第3期947-952,共6页
Rare Metal Materials and Engineering
基金
国家自然科学基金(51675256)
兰州理工大学红柳杰出人才培养计划(J201201)
关键词
TIG点焊
活性剂
宏观形貌
微观形貌
拉力
TIG spot welding
activating flux
macroscopic feature
microstructure
pull force
