脉冲宽度对亚微米级TC4钛合金激光微接焊缝成形及力学性能的影响  

Influence of Pulse Width on Laser Micro-weld Formation and Mechanical Properties of Sub-micron TC4 Titanium Alloy

作　　者：居琪萍 汪立高 许明方 梁晓梅 曹浩 陈玉华[2] JU Qiping;WANG Ligao;XU Mingfang;LIANG Xiaomei;CAO Hao;CHEN Yuhua(Fangda Special Steel Technology Co.,Ltd.,Nanchang 330012,China;Nanchang Hangkong University,Nanchang 330063,China;Harbin Welding Institute Limited Company,Harbin 150028,China)

机构地区：[1]方大特钢科技股份有限公司,江西南昌330012 [2]南昌航空大学,江西南昌330063 [3]哈尔滨焊接研究院有限公司,黑龙江哈尔滨150028

出　　处：《电焊机》2022年第6期126-130,共5页Electric Welding Machine

基　　金：国家重点研发计划资助项目(2021YFB3401100);黑龙江省头雁行动计划-能源装备先进焊接技术创新团队资助项目(201916120);新型钎焊材料与技术国家重点实验室开放课题(SKLABFMT202005)。

摘　　要：采用脉冲激光焊对0.2 mm厚TC4钛合金薄板进行对接焊,研究脉冲宽度对焊缝成形、微观组织和接头强度的影响。结果表明,由于冷却速度较快,得到的焊缝微观组织均为取向随机的针状α’马氏体相组成的网篮组织。随着脉冲宽度的增加,焊缝形貌由半圆形向X形转变。当脉冲宽度在2.7~4.9 ms时,试样的抗拉强度呈逐步递增趋势,脉冲宽度为4.9 ms时抗拉强度达到最大值(898.58 MPa)。硬度测试结果表明,脉冲宽度的增加导致焊接线能量增加,当脉冲宽度为4.9 ms时,焊缝区显微硬度达到最大值(379 HV)。TC4 titanium alloy has attracted extensive attention in various fields because of its excellent weldability.The butt welding of 0.2 mm TC4 titanium alloy sheet was carried out by pulse laser welding.The effects of pulse width on weld formation,microstructure and joint strength were studied.The results show that the microstructure of the weld is composed of needle martensiteα’phase with random orientation due to the high cooling rate.With the increase of pulse width,the joint morphology changes from semicircle to X shape.When the pulse width is between 2.7 ms and 4.9 ms,the tensile strength of the sample increases gradually,and reaches the maximum value(898.58 MPa)when the pulse width is 4.9 ms.The hardness test results show that the increase of pulse width leads to the increase of welding line energy.When the pulse width is 4.5ms,the microhardness of weld zone reaches the maximum value(379 HV).

关 键 词：超薄钛合金 脉冲激光焊 微观组织 力学性能 

分 类 号：TG456.7[金属学及工艺—焊接]