TC4钛合金激光填丝焊接工艺研究  

Research on Laser Filler Wire Welding Process of TC4 Titanium Alloy

作　　者：黄宇[1,2] 冯爱新[1,3] 罗敬文 李自强[1] 毛加成 程宝义[1] 吴浩[1] 张华夏[1] HUANG Yu FENG Aixin LUO Jingwen LI Ziqiang MAO Jiacheng CHENG Baoyi WU Hao ZHANG Huaxia(School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China School of Mechanic and Electronic Engineering, Wenzhou University, Wenzhou 305035, China Shanghai Smart-Prima Technology Limited Cooperation, Shanghai 201111, China)

机构地区：[1]江苏大学机械工程学院,江苏镇江212013 [2]上海普睿玛智能科技有限公司,上海201111 [3]温州大学机电工程学院,浙江温州325035

出　　处：《热加工工艺》2016年第19期23-26,30,共5页Hot Working Technology

基　　金：国家自然科学基金项目(51175237;51305050);"高档数控机床与基础制造装备"科技重大专项(2013ZX04009031-4);科技部中俄双边政府间2014-2015科技合作项目(CR17-11);浙江省国际科技合作专项(2013C14007);温州市工业科技研究开发项目(J20130033);江苏省"六大人才高峰"A类项目(1721111091)

摘　　要：针对钛合金激光自熔焊对毛坯和装夹精度要求高,焊接后表面存在凹陷、咬边、不饱满等问题,对1 mm厚TC4钛合金进行激光填丝焊试验,研究了焊丝送入条件、离焦量和送丝速度对焊缝成形质量的影响,并优选工艺参数,分析了焊接接头的显微组织、硬度和拉伸强度。结果表明:在工艺参数为离焦量+2 mm、激光功率800 W、焊接速度20mm/s、送丝速度25 mm/s、送丝角度50°、丝光间距0 mm时进行激光填丝焊,焊缝表面未出现凹陷、不饱满等缺陷,且焊缝微观组织致密。焊接接头的平均抗拉强度为1287 MPa,大约是基材的1.32倍,比激光自熔焊提高了20.96%左右。In view of high accuraly requirements of blank and clamping and some welding defects （like sag, surface undercut underfill and so on） tending to occur in the process of autogenously laser welding, the laser filler wire welding tests for TC4 titanium alloy sheet with lmm thickness were carried out to investigate the influence of wire feeding condition, defoeusing and wire feeding speed on weld forming quality. The microstructure, microhardness and tensile strength of welded joint were also investigated through choosing optimized process parameters. The results show that adapting some reasonable technology parameters can efficiently improve the weld forming quality （like sag, surface undercut, and density）, and the best process parameters of laser filler wire welding for TC4 titanium alloy are obtained： defocus 2 ram, laser power 800W, welding speed 20 mm/s, filler wire effding speed 25 ram/s, filler wire feeding angle 50°, and mercerizing spacing 0 ram. The average tensile strength of the welded joint with filler wire is 1287 MPa, which is 1.32 times of substmte and 20.96% higher than the joint with autogenously laser welding.

关 键 词：TC4钛合金 激光填丝焊 工艺参数 显微组织 

分 类 号：TG456.7[金属学及工艺—焊接]