【作者】 赵耀邦； 雷正龙； 陈彦宾；

【Author】 ZHAO Yao-bang,LEI Zheng-long,CHEN Yan-bin(State Key Lab of Advanced Welding Production Technology,Harbin Institute of Technology,Harbin 150001,China)

【机构】 哈尔滨工业大学现代焊接生产技术国家重点实验室；

【摘要】 在激光-电弧双面焊接工艺试验的基础上,以6mm厚5A06铝合金为试验材料,探讨激光功率对激光-电弧双面焊接头特征的影响规律。用金相显微镜观察到的焊缝宏观形貌显示,随着激光功率增加,焊缝中部熔宽、电弧侧熔宽逐渐增加,并造成电弧一侧焊缝余高的增加;扫描电子显微(SEM)组织表明,随着激光功率增加,电弧侧焊缝组织第二相质点变得粗大;采用能谱分析(EDS)对焊缝深度方向的Mg元素进行线扫描,发现随着激光功率增加,焊缝镁元素的烧损越来越严重。采用热电偶对激光-电弧双面焊接的热循环曲线测量证明,随着激光功率的增加,工件温度升高、热循环延长,这是造成焊缝形貌和微观组织及成分变化的主要原因。更多还原

【Abstract】 The 6 mm thickness of 5A06 aluminum alloy was welded by laser-TIG double-side welding to analyze the influence of laser power on the Joint characteristics.The weld profile shows that the weld width both in the middle and at the arc side is getting wider with the increasing laser power.what’s more,the extra height is caused by the increasing laser power.The microstructure of SEM indicates that the second phase particle is becoming larger with the increasing laser power.The Mg element content in the weld acquired by the EDS method reveals that more and more Mg element is vaporized by the increasing laser power.The Heat cycle curves of different laser power during laser-TIG double-side welding proves that the higher temperture and longer time is found with the increasing laser power,which are the main reason for the changing weld profile,microstructure and composition.更多还原