基于铜合金中间层的钛合金与不锈钢激光-电弧复合热源焊接研究  

Laser-Arc Hybrid Welding of Titanium Alloy and Stainless Steel with Copper Interlayer

作　　者：王红阳[1] 李权[1] 宋刚[1] 刘黎明[1] 

机构地区：[1]大连理工大学材料科学与工程学院辽宁省先进材料连接技术重点实验室,辽宁大连116024

出　　处：《中国激光》2016年第5期38-44,共7页Chinese Journal of Lasers

基　　金：国家自然科学基金(51304034);新世纪优秀人才支持计划(NCET-13-0079);辽宁省高等学校优秀人才支持计划(LJQ2013007)

摘　　要：运用激光-电弧复合热源焊接方法,通过添加Cu-Zn中间层实现了TC4钛合金与304不锈钢的良好焊接,并对搭接接头横截面形貌、微观组织、相成分、力学性能及断裂位置进行了分析。结果表明,钛合金与不锈钢复合焊接接头过渡区组织成分主要包括Ti-Cu金属间化合物、铜基固溶体及Fe-Cu共析混合物。随着激光功率的增加,在钛-铜界面一侧,生成的Ti-Cu金属间化合物厚度逐渐增大,对接头性能产生不良影响,激光功率较大时断裂发生在钛-铜界面处。在铜-不锈钢界面一侧,Cu和Fe元素互扩散的深度和密度随激光功率的增大逐渐增加,有利于提高接头性能,激光功率较小时断裂发生在铜-不锈钢界面处。实现钛合金与不锈钢的良好焊接的关键在于Ti-Cu金属间化合物与Fe-Cu共析混合物的协调控制。The TC4 titanium alloy and 304 stainless steel are welded by laser-arc hybrid heat source with copper interlayer.Macrostructure and microstructure of cross sections,main compositions,mechanical properties and fracture positions of welding joints are examined.The results show that the transition zone is characterized by Ti-Cu intermetallic,solid solution of copper,and Fe-Cu eutectic mixture.With the increase of laser power,the thickness of Ti-Cu intermetallic near the Ti-Cu interface increases,which has harmful effect on mechanical properties.Fracture of joint mainly happens at the interface between titanium alloy and copper when laser power is higher.The mutual diffusion depth and density of elements,such as copper and iron near the interface between copper and stainless steel,also increase,which is beneficial to enhancing mechanical properties.Fracture of joint mainly happens at the interface between the copper and stainless steel when laser power is lower.The key point to achieve favorite welding joint is the control of Ti-Cu intermetallic and Fe-Cu eutectic mixture.

关 键 词：激光技术 激光-电弧复合焊接 钛合金 不锈钢 铜中间层 金属间化合物 

分 类 号：TG44[金属学及工艺—焊接]