Cs对铝/钢激光熔钎焊接头组织及性能的影响  

Effect of Cs on microstructure and properties of Al/steel laser welded-brazed joints

作　　者：刘陆涛 浦娟[1] Liu Lutao;Pu Juan(Jiangsu University of Science and Technology,Zhenjiang 212003,Jiangsu,China)

机构地区：[1]江苏科技大学,江苏镇江212003

出　　处：《焊接》2023年第10期13-17,共5页Welding & Joining

基　　金：江苏省产学研合作项目(BY20221434)。

摘　　要：以无Cs型和含Cs型AlSi12药芯焊丝为填充金属,进行6061铝合金和Q235钢激光熔钎焊试验研究,用光学显微镜、扫描电子显微镜对熔钎焊接头的宏观形貌、微观组织进行分析,探讨药芯焊丝中Cs元素对AlSi12焊丝在钢表面的润湿铺展性能、接头微观组织及拉伸性能的影响。研究结果表明,药芯焊丝中加Cs元素,大大提高了熔融的焊丝在母材背面的润湿铺展性能,从而获得饱满美观的铝合金/钢激光熔钎焊接头形貌。Cs元素通过冶金反应过渡进入铝合金/钢焊接接头中,一定程度上阻碍了Al,Fe之间的反应,降低了接头界面反应层的金属间化合物层(IMCs)厚度,但是略微降低了接头的抗拉强度。Laser welding-brazing tests of 6061 aluminum alloy and Q235 steel were carried out by AlSi12 flux-cored welding wire without Cs and with Cs as filler metal.Macrostructure and microstructure of welded-brazed joints were analyzed by optical microscope and scanning electron microscope.Influence of Cs element on wetting and spreading ability of flux-cored welding wire on the steel surface,microstructure and tensile properties of welded-brazed joints was discussed.The research results showed that adding Cs element into flux-cored welding wire improved wetting and spreading ability of molten welding wire on the back of base metal,resulting in a full and beautiful appearance of Al alloy/steel laser welded-brazed joints.Cs elements transferred into Al alloy/steel welded-brazed joints through metallurgical reaction,and it hindered reaction between Al and Fe,so that thickness of intermetallic compound layer(IMCs)was decreased at the interface of welded-brazed joints.Moreover,tensile strength of welded-brazed joints was reduced.

关 键 词：激光熔钎焊 Cs元素 铝/钢异种金属 IMC界面层 抗拉强度 

分 类 号：TG456.7[金属学及工艺—焊接]