Metal transfer characteristics of tandem narrow gap GMAW for flat welding position  

作　　者：蔡笑宇 林三宝 范成磊 杨春利 徐望辉 张威 

机构地区：[1]State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology, Harbin, 150001 [2]Xi' an Space Engine Factory, Xi' an, 710100

出　　处：《China Welding》2015年第3期64-72,共9页中国焊接（英文版）

基　　金：This research is supported by National Natural Science Foundation of China （Grant No. 51275109）.

摘　　要：A series of experiments of tandem narrow gap GMAW for flat welding position were carried out. The arc behavior and metal transfer process were observed by a high-speed photography system. The effects of the welding parameters on the metal transfer were investigated. The results show that the arc behavior and metal transfer process of tandem narrow gap GMA W are different from these of bead-on-plate tandem GMA W. The arc behavior and metal transfer process are influenced by the distance between the two wires, the peak voltage, the pulse frequency and the peak time. With the increase of the distance between the two wires, the metal transfer mode gradually transforms from one pulse-multi droplets into one pulse-one droplet, and the average welding current increases. With the increase of the peak voltage, pulse frequency or peak time, the metal transfer mode transforms from one pulse-one droplet into one pulse-multi droplets, and the arc tends to occur between the wire and the sidewall.A series of experiments of tandem narrow gap GMAW for flat welding position were carried out. The arc behavior and metal transfer process were observed by a high-speed photography system. The effects of the welding parameters on the metal transfer were investigated. The results show that the arc behavior and metal transfer process of tandem narrow gap GMA W are different from these of bead-on-plate tandem GMA W. The arc behavior and metal transfer process are influenced by the distance between the two wires, the peak voltage, the pulse frequency and the peak time. With the increase of the distance between the two wires, the metal transfer mode gradually transforms from one pulse-multi droplets into one pulse-one droplet, and the average welding current increases. With the increase of the peak voltage, pulse frequency or peak time, the metal transfer mode transforms from one pulse-one droplet into one pulse-multi droplets, and the arc tends to occur between the wire and the sidewall.

关 键 词：metal transfer arc behavior narrow gap welding tandem GMAW 

分 类 号：TG444.7[金属学及工艺—焊接] TG403