热源顺序对HG785D高强钢激光-电弧复合焊耦合机理与接头性能的影响  

Effect of Heat Source Order on Coupling Mechanism and Mechanical Properties of Joints in Laser-Arc Hybrid Welding of HG785D High-Strength Steels

作　　者：李昊岳 檀财旺[1,3,2] 张强 陈波 宋晓国[3,2] 李俐群 冯吉才[1] Li Haoyue;Tan Caiwang;Zhang Qiang;Chen Bo;Song Xiaoguo;Li Liqun;Feng Jicai(State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, Heilongjiang 150001, China;Shandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology Weihai, Shandong 264209, China;Science and Technology on Vehicle Transmission Laboratory, China North Vehicle Research Institute, Beijing, 100072, China;Shandong Institute of Shipbuilding Technology, Weihai, Shandong 264209, China)

机构地区：[1]哈尔滨工业大学先进焊接与连接国家重点实验室,黑龙江哈尔滨150001 [2]山东船舶技术研究院,山东威海264209 [3]哈尔滨工业大学山东省特种焊接技术重点实验室,山东威海264209 [4]中国北方车辆研究所车辆传动重点实验室,北京100072

出　　处：《中国激光》2018年第5期78-87,共10页Chinese Journal of Lasers

基　　金：山东省重大科技创新工程项目(2017CXGC0811)

摘　　要：采用激光-电弧复合焊的方法焊接了HG785D高强钢,研究了不同热源顺序下激光功率和送丝速度对焊接过程的影响。观察了复合焊过程中等离子体的动态变化,并获取了不同热源顺序下等离子体的电子温度和电子密度,揭示了焊接过程热源耦合机理。结果表明,随着激光功率的增大,焊缝熔深先减小后增大;随着送丝速度的增大,焊缝熔深逐渐减小。相较于电弧先导,激光先导等离子体的体积较大且电子温度较高,焊缝熔深较大,同时接头的抗拉强度较大,但塑性较弱,且接头各区域的显微硬度较大。The laser-arc hybrid welding of HG785 Dhigh-strength steels is performed and the effects of laser power and wire feeding speed on the hybrid welding process under different heat source orders are investigated.The dynamic behavior of plasma in the hybrid welding process is investigated.The electron temperature and electron density in plasma under different heat source orders are obtained and the coupling mechanism of heat sources in the welding process is disclosed.The results show that,the weld penetration decreases first and then increases with the increase of laser power,and it decreases gradually with the increase of wire feeding speed.Under the laser-leading condition,the plasma possesses a large volume and a high electron temperature,and the weld penetration is large,simultaneously,the tensile strength of joints is high but the plasticity is weak,and the micro-hardness at each area of joints is high,if compared with those under the arc-leading condition.

关 键 词：激光技术 复合焊接 等离子体 电子温度 电子密度 耦合机理 

分 类 号：TG456.7[金属学及工艺—焊接]