| 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. |
| 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 |
| DOI： |
| 分类号: |
| 基金项目: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) |
|
| Analysis of residual stress and hardness of T-joint on China low activation martensitic steel laser weld |
|
LEI Yucheng1, LI Zhennan1, ZHU Yanshan2, JU Xin3
|
|
1.School of Material Science and Engineering of Jiangsu University, Zhenjiang 212013, China;2.Technical Center of Jinan Iron and Steel Co., Ltd., Jinan 250101, China;3.Physics Department, University of Science and Technology of Beijing, Beijing 100083, China
|
| Abstract: |
| 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. |
| Key words: low activation martensitic steel YAG laser welding incidence angle residual stress hardness |
