快速冷却对6005A铝合金多道次MIG焊接残余应力的影响  

Effect of Rapid Cooling on Residual Stress in Multi-Pass MIG Welding of 6005A Aluminum Alloy

作　　者：胡云瑞 李鸣申 王留芳 吕赞[2] HU Yunrui;LI Mingshen;WANG Liufang;LYU Zan(CRRC Sifang Co.,Ltd.,Qingdao 266111,China;Faculty of Aerospace Engineering,Shenyang Aerospace University,Shenyang 110136,China)

机构地区：[1]中车四方车辆有限公司,山东青岛266111 [2]沈阳航空航天大学航空宇航学院,辽宁沈阳110136

出　　处：《热加工工艺》2022年第1期103-106,共4页Hot Working Technology

基　　金：国家自然科学基金项目(51705339)。

摘　　要：快速冷却工艺作为一种随焊应力控制方法,可应用于铝合金材料的焊接,并已取得良好的残余应力控制效果。但是目前针对快速冷却工艺控制铝合金厚板多道次焊接残余应力的研究却鲜有报道。本研究以6005A铝合金为研究对象,采用试验和模拟的方式对快速冷却条件下的铝合金多道次MIG焊接温度和残余应力进行研究。研究表明,快速冷却工艺在焊接过程中可迅速降低焊接温度,并缩小高温区域范围。最终,焊缝区纵向残余拉应力峰值由96.8 MPa降低为77.2 MPa,下降幅度为20.2%。As a control method of welding stress,rapid cooling technique can be used in welding of aluminum alloy,and it has achieved good control effect of welding residual stress.However,few reports have focused on the study of rapid cooling to control the residual stress of multi-pass welding of thick aluminum alloy plate.In this research,experimental and numerical methods were used to study the effect of rapid cooling on welding temperature and residual stress of 6005A aluminum alloy multi-pass MIG welding.The results show that the rapid cooling could quickly decrease the welding temperature and the high temperature range in the welding stage,and the peak longitudinal residual tensile stress of the weld decreases from 96.8 MPa to 77.2 MPa,with a decrease amount of 20.2%.

关 键 词：快速冷却 铝合金 MIG焊接 温度 残余应力 

分 类 号：TG457.14[金属学及工艺—焊接]