中厚板铝/钢异种材料激光深熔钎焊工艺的研究  

Laser Keyhole Welding-brazing for Dissimilar Metals between Aluminum Alloy and Steel

作　　者：钱伟[1] 崔丽[1] 马彪[1] 杨武雄[2] 杨胶溪[2] 

机构地区：[1]北京工业大学材料科学与工程学院,北京100124 [2]北京工业大学激光工程研究院,北京100124

出　　处：《应用激光》2015年第4期451-455,共5页Applied Laser

基　　金：国家自然科学基金资助项目(项目编号:51475006);北京工业大学基础研究基金资助项目(项目编号:X4009012201401)

摘　　要：采用光纤激光器,不添加任何填充材料,对6.0mm厚5083铝合金和3.5mm厚低碳钢板材进行激光深熔对接工艺试验,研究激光偏移量对接头焊缝成形的影响。利用光学显微镜、扫描电镜、显微硬度仪、拉伸试验机等研究接头界面的微观组织、显微硬度和抗拉强度。结果表明,激光束偏移量Δd由0.3~0.7mm变化时,界面金属间化合物从21.0μm逐渐减小到4.1μm;当激光偏移量为0.7mm和0.3mm时,接头界面层的平均硬度分别为765.4 HV和671.3 HV。当激光偏移量为0.6mm时,接头抗拉强度强度最高,平均抗拉强度为107 MPa,达铝母材的60%。The laser keyhole welding was carried out onthe butt joints between the Q235 steel sheets with thickness of 3.5mm and the 6.0mm thick 5083 aluminum alloy with a fiber laser.The effects of laser distance on the weld shape were investigated.The microstructures and mechanical properties of the joints were investigated by optical microscope,scanning electron microscope,micro-hardness tester and tensile testing machine.Results show that the thickness of intermetallic layer in the interface of the welded joints gradually decreases from 21.0μm to 4.1μm with laser distance varies from 0.3to 0.7mm.When the laser distanceis0.7mm and 0.3mm,the average hardness of the intermetallic layeris 765.4HV and 671.3HV,respectively.The maximum tensile strength is 107 MPa when the laser distance is 0.6mm,which reaches the 80%tensile strength of the 5083 alloys.

关 键 词：铝/钢异种材料 激光深熔钎焊 金属间化合物 力学性能 

分 类 号：TG442[金属学及工艺—焊接]