焊接参数对不等厚钛合金角接结构激光诱导电弧焊接成形的影响  

Effect of welding parameters on laser-TIG induced welding of unequal thickness titanium alloy fillet structure

作　　者：吕晓辉 徐信坤 高健 王红阳[1] 刘黎明[1] LV Xiaohui;XU Xinkun;Gaojian;WANG Hongyang;LIU Liming(Key Laboratory of Liaoning Advanced Welding and Joining Technology,School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024,China;Representative Office of the Army in Dalian,Dalian 116024,China)

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焊接与连接重点实验室,辽宁大连1160242 [2]陆军驻大连地区代表室,辽宁大连1160242

出　　处：《电焊机》2020年第7期18-23,I0003,I0004,共8页Electric Welding Machine

基　　金：国家重点研发计划(2018YFB1107902)。

摘　　要：采用低功率激光诱导TIG电弧焊接技术,对15 mm和6 mm厚TC4钛合金板的角接结构焊接工艺进行研究。分析了焊接参数对不等厚板角接结构焊缝成形、焊接接头典型组织特征和显微硬度分布的影响机理。试验结果表明:在激光功率485 W、TIG电弧电流240 A、预留间隙0.3 mm时可获得最佳成形焊接接头;激光与电弧的匹配增大了焊接参数选择范围,可增强面对特殊结构的焊接适应性。钛合金不等厚板角接结构焊后接头呈非对称状,两侧组织存在差异,薄板侧晶粒长大明显,出现柱状晶区,TC4双相钛合金焊后组织中出现的网篮组织能提升焊缝强度。The low-power laser-TIG hybrid welding technology was used to test the based welding of the 15 mm and6 mm TC4 titanium alloy fillet structures. Analyze the difference in weld formation of fillet joint structures of unequal thickness plates with different welding parameters,typical microstructure characteristics and microhardness distribution of welded joints.The results show that the best welding joint is obtained when the laser power is 485 W,the TIG arc current is 240 A,and the reserved gap is 0.3 mm;the matching use of the laser and arc allows a wider range of welding parameter choices,which enhances welding adaptability to special structures. The joints of unequal-thickness plate of titanium alloy have asymmetric joints after welding. The microstructures on the two sides are different and the grains on the thin plate side grow significantly and columnar grains appear. The basketweave structure in the TC4 α-β titanium alloy after welding can improve the strength of the weld.

关 键 词：不等厚 角接结构 焊接适应性 TC4双相钛合金 网篮组织 

分 类 号：TG457[金属学及工艺—焊接]