一种新型的窄间隙焊接温度场测量方法  

A new method to measure narrow gap welding temperature field

作　　者：兰虎[1,2] 张华军 田小林 林尚扬 汪彬 李刚[2] LAN Hu;ZHANG Huajun;TIAN Xiaolin;LIN Shangyang;WANG Bin;LI Gang(Rongcheng Campus,Harbin University of Science and Technology,Rongcheng 264300,China;College of Engineering,Zhejiang Normal University,Jinhua 321004,China;Harbin Welding Limited Company,Harbin 150028,China)

机构地区：[1]哈尔滨理工大学荣成学院,荣成264300 [2]浙江师范大学工学院,金华321004 [3]哈尔滨焊接研究院有限公司,哈尔滨150080

出　　处：《焊接学报》2018年第2期110-114,134,共6页Transactions of The China Welding Institution

基　　金：黑龙江省科学基金项目(QC2017057)

摘　　要：准确测定粗晶热影响区(coarse-grained heat affected zone,CGHAZ)的热循环曲线是分析窄间隙焊接(narrow gap welding,NGW)冶金过程的基本前提.针对NGW CGHAZ狭小对焊接温度场测量带来的挑战,提出了一种新型的近侧壁隐藏布置热电偶测温方法,成功获取了先进高强钢厚板窄间隙旋摆电弧熔化极活性气体保护焊(narrow gap metal active gas welding with arc swinging and shifting,NG-S^2MAG)立焊接头CGHAZ的热循环曲线,并通过理论分析计算和显微组织对比证实了新方案的可行性.结果表明,在实现坡口双侧侧壁"分时"熔合过程中,NG-S^2MAG立焊电弧的逐次逼近而后远离造成温度曲线的"多峰"性,使得母材CGHAZ在1 200℃以上的高温区停留时间较传统直通电弧MAG立焊短.Accurate measurement of thermal cycle curves in coarse-grained heat affected zone(CGHAZ)near the fusion line on both sides of the groove is the basic premise to analyze the thermal process and metallurgical process of narrow gap welding(NGW).Aiming at the challenge of the measurement of welding temperature field for narrow CGHAZ in NGW,a new concealed thermocouple method was proposed to acquire the thermal cycle curves of CGHAZ during multi-layer narrow gap MAG welding process with arc swinging and shifting(NG-S 2MAG)at vertical position,and the feasibility of the new method was proved through theoretical analysis and experimental demonstration of microstructure.The results show that the characteristics of thermal cycle curves of CGHAZ during multi-layer NG-S 2MAG is multi-peak,which is caused by arc swinging and asynchronous fusion of both side-walls of the groove,which determines that the holding time at above 1 200℃in CGHAZ zone will be less than that in the conventional through-arc GMAW welding.

关 键 词：窄间隙焊接 焊接温度场 数值模拟 焊接热模拟 

分 类 号：TG401[金属学及工艺—焊接]