不锈钢/铝合金异种金属激光-MIG熔钎焊工艺研究  

Research on Laser-MIG Fusion-Brazing Welding of Stainless Steel/Aluminum Dissimilar Metals

作　　者：朱宗涛[1] 万占东 薛珺予 

机构地区：[1]西南交通大学材料科学与工程学院,成都610031

出　　处：《材料导报》2017年第12期52-55,共4页Materials Reports

基　　金：国家自然科学基金(51405398);中央高校基本科研业务费专项资金(2682015CX007)

摘　　要：分别采用激光-MIG复合焊和单MIG焊,实现了2mm厚的304不锈钢和6061铝合金对接接头的熔钎焊,对比了不同焊接热源对接头显微组织、界面层化合物及力学性能的影响。结果表明,采用激光-MIG复合焊可以获得性能良好的不锈钢-铝对接接头。激光-MIG复合焊接头的界面层化合物为FeAl_2和Fe_4Al_(13),厚度约为5μm;而单MIG焊接头的界面层化合物厚度约为3μm,主要为Fe_4Al_(13)。激光-MIG复合焊接头的抗拉强度为105MPa,比单MIG焊接头提高了10.8MPa,达到铝合金母材的33.9%。接头试样拉伸断裂均起裂于钎焊界面处,并向余高处扩展,且由脆性断裂转变为韧性断裂。The sound butt joints of 304 stainless steel/6061 alloy with a thickness of 2 mm were obtained using laser-MIG hy- brid and MIG fusion-brazing welding. The microstructure, interface near stainless steel and mechanical property of the joints were in- vestigated. The compounds layer in stainless steel/alloy laser-MIG hybrid fusion-brazing joints consisted of FeAlz （near stainless steel） and Fe4 Al13 with a total thickness of 5 μm, but the thickness of joints welded by MIG was 3 μm. The tensile strength of laser- MIG hybrid fusion-brazing joints increased to 105 MPa （10. 8 MPa higher than that of MIG fusion-brazing joints）, which is 33.9% of the tensile strength of 6061 alloy. The fractures of the tensile specimens all originated in the interface of intermetallic compounds and spread to the reinforcement on the top side. The fracture mode also changed from the brittle rupture at the beginning to ductile rupture in the end.

关 键 词：异种金属 激光-MIG复合焊 熔钎焊 金属间化合物 

分 类 号：TB456.9[一般工业技术]