特种钎剂辅助铝/钢异种合金TIG熔-钎焊  

TIG welding-brazing of special flux assisted aluminum-steel dissimilar alloys

作　　者：宋建岭[1] 林三宝[1] 杨春利[1] 马广超[1] 

机构地区：[1]哈尔滨工业大学现代焊接生产技术国家重点实验室,哈尔滨150001

出　　处：《焊接学报》2010年第2期45-48,共4页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(50874033)

摘　　要：采用铝硅钎料进行了铝/钢异种合金TIG熔-钎焊试验,开发出了适用于TIG电弧热源下的特种钎剂,通过高速摄影观察了液态钎料的润湿铺展行为,并分析了接头特性.结果表明,特种钎剂能够显著促进钎料的润湿铺展,钎剂成分(质量分数,%)为:改性的Noclock钎剂(KAlF4:K3AlF6,65:35)55～78,Zn10～20,Sn10～20,K2SiF62～5.液态钎料的铺展包括两部分:一是通过成形槽,沿钢背面进行铺展,获得良好的背面成形;二是沿坡口表面进行"上坡"铺展,实现焊缝正面成形.铝/钢TIG熔-钎焊接头具有熔焊与钎焊的双重性质,接头抗拉强度可达115.5MPa,断裂于焊缝/不锈钢界面层.The experiments of special flux assisted TIG welding-brazing for aluminum and steel dissimilar alloys was carried out by using Al-Si eutectic filler metal. The special flux applied to TIG heating was developed, the wetting and spreading behavior of liquid filler metal on the steel surface was observed by high-speed camera, and the typical TIG welding-brazing butt joint was analyzed. The results show the special flux can greatly promote the wetting and spreading of the filler metal on the steel surface, which the composition (mass fraction, %) is the modified Noclock flux (KAlF4: K3AlF6, 65∶35) 55-78,Zn 10-20,Sn 10-20 and K2SiF6 2-5. With the action of special flux, the spreading behavior of liquid filler metal consists of two parts: one is to spread on the back face to pack the steel; the other is to uphill spread on the front face of the groove to form a sound brazed joint. A sound welding-brazing butt joint is obtained, which has a dual characteristic: in aluminum side it is a welding joint, and in steel side it is a brazing joint. The tensile strength of the butt joint reaches 115.5 MPa and the fracture occurs the interface of welded seam and the steel.

关 键 词：铝-钢异种合金 钨极氩弧熔-钎焊 特种钎剂 接头特性 

分 类 号：TG457.1[金属学及工艺—焊接]