Droplet Transfer Behavior of Flux Cored Wire TIG Welding  

作　　者：Lijun Yang Tianxi He Ying Liu Yonglei Zhai Huan Li 

机构地区：[1]School of Materials Science and Engineering,Tianjin University,Tianjin 300350,China [2]Tianjin Key Laboratory of Advanced Joining Technology,Tianjin 300350,China

出　　处：《Transactions of Tianjin University》2018年第1期82-90,共9页天津大学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.51175374);the Natural Science Foundation of Tianjin(No.16JCZDJC38700)

摘　　要：This paper puts forward a new method to achieve flux cored wire TIG welding and uses high-speed photography to analyze the droplet transfer behavior and forces acting on the droplet. The droplet transfer forms include bridging transfer, slag column guided transfer, and non-contact transfer; each of these forms may be observed as the melting position of the welding wire changes. The important role of surface tension in the process of droplet transfer is proposed using static force balance theory and pinch instability theory. The phenomenon of droplet backward swing during welding process could be attributed to the vapor recoil force produced by vapors from the droplet. The welding experiments show that the proposed welding process is stable and that the weld quality produced is good.This paper puts forward a new method to achieve flux cored wire TIG welding and uses high-speed photography to analyze the droplet transfer behavior and forces acting on the droplet. The droplet transfer forms include bridging transfer, slag column guided transfer, and non-contact transfer; each of these forms may be observed as the melting position of the welding wire changes. The important role of surface tension in the process of droplet transfer is proposed using static force balance theory and pinch instability theory. The phenomenon of droplet backward swing during welding process could be attributed to the vapor recoil force produced by vapors from the droplet. The welding experiments show that the proposed welding process is stable and that the weld quality produced is good.

关 键 词：TIG WELDING FLUX cored wire DROPLET transfer Surface tension Vapor RECOIL force 

分 类 号：G64[文化科学—高等教育学]