Effect of the wire preheating temperature on the metal transfer in GMAW with thick wire
A hot wire GMAW method using a TIG arc to preheat the wire was proposed and the corresponding experimental system was developed. The images of molten metal droplets in GMAW with thick-wire diameter of 3.2 mm were captured by a high-speed camera, and the influence of the wire temperature on metal transfer was analyzed by measurements of droplet radius and transfer frequency. Two metal transfer modes were mentioned in this paper: the short-circuit transfer and globular transfer mode. The results demonstrate that the wire temperature significantly impacts the droplet transfer mode, droplet size and transfer rate at certain welding current range. And with the increasing wire temperature , the change of metal transfer mode was observed. By increasing the temperature of the welding wire, the droplet size decrease and the droplet frequency of metal transfer increases accordingly. In addition, it is important that the drop spray mode, which hardly occurs in GMAW with steel wire, was obtain by means of increasing the temperature of welding wire.
thick wire GMAW wire temperature metal transfer
Ni Jun Gao Hongming Zhang Zongyu
State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, 150001, Heilongjiang, China
国际会议
济南
英文
1-8
2012-08-24（万方平台首次上网日期，不代表论文的发表时间）