TC4钛合金激光-MIG复合焊接头组织与性能研究  

Study on the structure and properties of titanium alloylaser-MIG hybrid welding joint

作　　者：皇甫乐森 赵勇[1] 陈宇航 周礼龙 潘艳飞 陈国强 HUANGFU Lesen;ZHAO Yong;CHEN Yuhang;ZHOU Lilong;PAN Yanfei;CHEN Guoqiang(School of Materials Science and Engineering,Jiangsu University of Science and Technology,Zhenjiang 212100,China;Aerospace Engineering Equipment(Suzhou)Co.Ltd.,Suzhou 215100,China;Jiangsu Changjiang Intelligent Manufacturing Research Institute Co.Ltd.,Changzhou 213000,China;Jiangsu Yangtze Mitsui Shipbuilding Co.Ltd.,Taicang 215000,China)

机构地区：[1]江苏科技大学材料科学与工程学院,镇江212100 [2]航天工程装备(苏州)有限公司,苏州215100 [3]江苏长江智能制造研究院有限责任公司,常州213000 [4]江苏扬子三井造船有限公司,太仓215000

出　　处：《江苏科技大学学报(自然科学版)》2025年第1期38-41,共4页Journal of Jiangsu University of Science and Technology:Natural Science Edition

基　　金：江苏省产学研合作项目(BY2020449)。

摘　　要：采用激光-MIG复合焊接方法焊接了5 mm厚的TC4钛合金对接接头,焊后观察和分析了接头不同部位的微观组织特征,并通过拉伸和硬度试验测试接头的力学性能,结果表明:采用激光功率3.8 kW,焊接电流120 A,焊接速度0.8 m/min,光丝间距2 mm,离焦量6 mm的焊接工艺参数焊接5 mm厚TC4钛合金对接接头,焊缝表面呈银白色且成形良好,内部无气孔缺陷.焊缝区主要由α′+β相组成,β柱状晶内部为互相垂直的针状马氏体α′;粗晶区β晶粒呈等轴状,α′相尺寸相比于焊缝更小;细晶区少量的针状马氏体α′相分布在α+β基体上.接头热影响区硬度最高,为359HV;拉伸试样均断裂在母材处.A 5 mm thick TC4 titanium alloy butt joint was welded using laser MIG hybrid welding method.The microstructure characteristics of different parts of the joint were observed and analyzed after welding,and the mechanical properties of the joint were tested through tensile and hardness tests.The results showed that the welding process parameters of laser power 3.8 kW,welding current 120 A,welding speed 0.8 m/min,light wire spacing 2 mm,and defocus distance 6 mm were used to weld the 5 mm thick TC4 titanium alloy butt joint.The surface of the weld seam is silver white and well formed,with no internal stomatal defects.The weld area is composed ofα′+βphases,inside columnar crystals being mutually perpendicular acicular martensiteα′.In the coarse-grained region,βgrains are equiaxed,and compared to the weld seam,the relative size ofα′phase is smaller.A small amount of acicular martensiteα′phase in the fine-grained zone is distributed on theα+βsubstrate.The hardness of joint heat-affected zone is the highest,being 359HV;the tensile specimens all fracture at the base metal.

关 键 词：TC4钛合金 激光-MIG复合焊 微观组织 力学性能 

分 类 号：TG456.7[金属学及工艺—焊接]