CLAM钢激光焊T形接头残余应力及硬度分析  

Analysis of residual stress and hardness of T-joint on China low activation martensitic steel laser weld

作　　者：雷玉成[1] 李振南[1] 朱延山[2] 巨新[3] 

机构地区：[1]江苏大学材料科学与工程学院,镇江212013 [2]济南钢铁股份有限公司技术中心,济南250101 [3]北京科技大学数理学院,北京100083

出　　处：《焊接学报》2012年第6期73-76,116,共4页Transactions of The China Welding Institution

基　　金：江苏省研究生创新计划资助项目(CX09B_195Z);国家973计划资助项目(2008CB717802)

摘　　要：采用功率为4 kW的Nd:YAG激光器,对4 mm厚的CLAM钢板组成的T形接头,用不同的激光入射角度进行了激光焊接试验,对焊缝接头的宏观成形,残余应力的分布以及硬度变化进行观察和测试.结果表明,入射角度为14°时焊缝接头具有明显的未熔合现象,随着焊接角度的减小,采用12°和10°时完全熔合,接头表面的残余应力为压应力,入射角度为12°时翼板残余压应力比腹板的大,入射角度为10°时腹板的残余应力较大,接头截面的内部残余应力变化很大,焊缝区的硬度相对于母材有明显提高,焊接热影响区未出现软化现象.T-joint of 4mm-thick CLAM steel was welded by 4 kW Nd：YAG laser welding equipment with different incident angles.Forming,distribution of residual stress and hardness are observed and analyzed.The result show that there is significant lack of fusion in the joint when the incidence angle is 14° and the joint fully fuses when the angle is 12°or 10° with the decreasing of incidence angle.The residual stress of the joint surface is compressive stress,the stress of flange is larger that of web when the angle is 12°.But the stress of web is larger when the angle is 10°.Inner stress largely changes in the section of the weld joint,compared with base metal,the hardness of weld zone has significantly increased and HAZ is not softened.

关 键 词：中国低活化马氏体钢 Nd:YAG激光焊 入射角度 残余应力 硬度 

分 类 号：TG456.7[金属学及工艺—焊接]