钛合金激光-TIG复合焊接保护状态对焊缝成形及性能影响  

Effect of protection condition on forming and performance of weld in titanium alloy laser-TIG hybrid welding

作　　者：史吉鹏[1] 王红阳[1] 杨林波[1] 刘黎明[1] 

机构地区：[1]大连理工大学辽宁省先进材料连接技术重点实验室,大连116024

出　　处：《焊接学报》2017年第2期61-65,共5页Transactions of The China Welding Institution

基　　金：国家科技重大专项资助项目(2013ZX04001-041-05)

摘　　要：用激光-TIG复合热源对2.5 mm厚TA15钛合金进行对接焊试验.利用万能力学拉伸机、红外热成像仪、电子探针(EPMA)、扫描电镜(SEM)等分析手段对焊接接头进行测试分析,并与单TIG焊进行对比.分析焊接工艺参数和接头保护时间对焊接接头形貌和性能的影响.结果表明,实现2.5 mm厚钛合金全熔透焊接时,激光-TIG复合焊比单TIG焊速度更快、热输入更低,焊缝和热影响区更窄,晶粒更细;相同保护条件下,激光-TIG复合焊接头比单TIG焊接头具有更高的强度、塑性和更好的疲劳性能;激光-TIG复合焊缝冷却速率高于单TIG焊,获得良好的保护状态时所需保护时间更短.Laser-TIG hybrid experiments were carried out for butt weld of the TA15 titanium alloy sheets with 2. 5 mm thick. Multifunction tensile testing machine,infrared thermometer,EPMA and SEM were used to analyze the weld joints,and a comparison with single TIG was made. Welding process,joint performance and weld protection were investigated. Results show that compared with single TIG welding,when full penetration welding of Ti alloy with 2. 5 mm thick is realized,laser-TIG hybrid welding possesses faster welding speed and lower heat input,which leads to a narrower and a finer microstructure. Laser-TIG hybrid welding produces weld joints with higher strength,plasticity and better fatigue performance. And because the cooling rate of laser-TIG hybrid welding is higher than that of single TIG,it needs shorter time of protection to achieve good results.

关 键 词：激光-TIG复合焊 钛合金 接头性能 接头保护 

分 类 号：TG407[金属学及工艺—焊接]