摘要
采用CO2激光焊接汽车专用高强钢,得到了性能良好的激光焊接件。为了提高本试验的测量精度,对测量残余应力的小孔法作了必要的修正。使用ANSYS软件对激光焊接残余应力进行了有限元分析,仿真结果与修正后的测试值吻合,在此基础上研究了高强钢激光焊接线能量对残余应力的影响规律。试验结果表明,纵向残余应力在距离焊缝中心约2.5 mm处达到最大,距离焊缝越远残余应力值越小,并最终达到稳定;在被焊试件前添加引弧板,可以使焊接试件起始段的残余应力分布与稳定段接近,消除了起始段残余应力不稳定的现象;线能量增加,则横向残余应力逐渐增大,而纵向残余应力的最大值减小。
The excellent welding joints are obtained when the high strength automobile special steels are welded by CO2 laser. In order to improve the measuring accuracy of the test, the small hole method of measuring residual stress is revised necessarily. The simulation results coincide with the modified test values after ANSYS software being used to calculate residual stress. The influence of line energy on residual stress is researched for laser welding high strength steel plates by the test method. The test results show that the longitudinal residual stress reaches a maximum at a distance of approximately 2.5 mm far away from the center of welding seam, and the farther away from the weld seam, the smaller the value of residual stress is, and the residual stress ultimately achieves stability. The residual stress distribution of the initial stage is close to that of the stable stage by adding the arc plate in front of the welded specimen, which eliminates unstable phenomenon of residual stress of the initial stage. The transverse residual stress increases gradually and the maximum value of the longitudinal residual stress decreases when the line energy increases.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2015年第6期129-135,共7页
Chinese Journal of Lasers
基金
广东省自然科学基金(2014A030313638)
国家自然科学基金(51375101)
关键词
激光技术
激光焊接
高强钢
残余应力
线能量
laser technique
laser welding
high strength steel
residual stress
linear energy
