TC4钛合金激光点焊工艺研究  

Study on laser spot welding process of TC4 titanium alloy

作　　者：郑建超 李锋 谢洪志[1] 关峰[1] 赵兴旺 ZHENG Jianchao;LI Feng;XIE Hongzhi;GUAN Feng;ZHAO Xingwang(Shenyang Aircraft Industry(Group)Co.,Ltd.,Shenyang 110034,Liaoning,China;No.1 Military Representative Office of the Air Force in Shenyang Area,Shenyang 110034,Liaoning,China)

机构地区：[1]沈阳飞机工业(集团)有限公司,辽宁沈阳110034 [2]空装驻沈阳地区第一军事代表室,辽宁沈阳110034

出　　处：《金属加工(热加工)》2025年第2期57-63,共7页MW Metal Forming

摘　　要：研究了不同离焦量、焊接功率和焊接速度等参数下TC4钛合金激光点焊的内外部质量和力学性能。采用场发射扫描电子显微镜、光学显微镜对焊点内外部质量进行观察,并经抗剪强度测试,分析了激光功率对抗剪强度的影响,对比了激光点焊与电阻点焊的抗剪强度差异。结果表明:离焦量可有效增加焊点的熔深,提高熔核直径;激光功率越高,焊点熔核直径越大;焊接速度的增加可改善焊点的表面质量,降低表面凹陷;激光点焊试件的抗剪强度与熔核直径之间呈正相关,与电阻点焊对比,激光点焊的抗剪强度要略低于电阻点焊。Investigates the internal and external quality,as well as mechanical properties,of laser spot welding of TC4 titanium alloy under different parameters of defocusing amount,welding power,and welding speed.Field emission scanning electron microscopy and optical microscopy were employed to observe and analyze the internal and external quality of the weld spots,and shear strength tests were conducted to analyze the influence of laser power on shear strength.The shear strength differences between laser spot welding and resistance spot welding were also compared.The results show that the defocusing amount can effectively increase the penetration depth and improve the nugget diameter of the weld spots.Higher laser power leads to a larger nugget diameter of the weld spots.An increase in welding speed can improve the surface quality of the weld spots and reduce surface depressions.There is a positive correlation between the shear strength of the laser spot welding specimens and the nugget diameter.Compared with resistance spot welding,the shear strength of laser spot welding is lower.

关 键 词：激光点焊 离焦量 焊接功率 焊接速度 熔核直径 

分 类 号：TG456.7[金属学及工艺—焊接]