摘要
采用不同激光/电弧能量配比(QR_(LA))对8 mm厚Q345钢板进行激光-MIG(metal inertgas,MIG)复合焊接,研究了QR_(LA)对复合焊接头的截面形貌和显微组织的影响,并分析了不同QR_(LA)下焊接过程的温度场和接头残余应力分布的变化规律。结果表明,随着QR_(LA)增大,熔宽显著下降,焊接过程的最高温度略有升高。因焊速较快,粗晶热影响区出现了较多的马氏体,且马氏体数量随着QR_(LA)增大而略有增加。QR_(LA)在0.72~1.0范围时,等效残余应力、纵向残余应力、横向残余应力和厚度方向残余应力峰值随着激光功率增加均出现下降趋势。但QR_(LA)从1.0上升至1.18时,各应力的峰值随着激光功率增加而有所上升。
Hybrid laser-MIG welding of 8 mm thick Q345 steel plates was carried out using different laser-to-arc heat input ratio(QR_(LA)).The effects of QR_(LA) on the cross-sectional macro-morphology and the microstructures in the hybrid welded joint were investigated.Development of temperature field distribution in the welding process and residual stress distribution in the welded joint under different QR_(LA) were also analyzed.The results show that the weld bead width decreases while peak temperature in the welding process increases with elevated QR_(LA).The microstructure of coarse grained HAZ is mostly martensite due to the high welding speed,and the amount of martensite increases with elevated QR_(LA).The stress levels of equivalent residual stress,longitudinal residual stress,transverse residual stress and through-thickness stress all reduce moderately as laser power increases with QR_(LA) in the range of 0.72~1.0.However,the stress levels of the four stresses increases slightly as laser power increases with QR_(LA) in the range of 1.0~1.18.
作者
严春妍
朱子江
张浩
张可召
顾正家
包晔峰
YAN Chunyan;ZHU Zijiang;ZHANG Hao;ZHANG Kezhao;GU Zhengjia;BAO Yefeng(College of Mechanical and Electrical Engineering,Hohai University,Changzhou 213022,China)
出处
《电焊机》
2022年第2期1-7,共7页
Electric Welding Machine
基金
国家自然科学基金资助项目(51804097)
中央高校基本业务费基金(B200203154)。
关键词
激光电弧复合焊
激光/电弧能量配比
显微组织
温度场
残余应力场
hybrid laser arc welding
laser-to-arc heat input ratio
microstructure
temperature field
residual stress filed
