A dynamic welding heat source model in pulsed current gas tungsten arc welding

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作   者：

Zhang Tong;  Zheng Zhentai;  Zhao Rui; 

作者机构：

School of Materials Science and Engineering;  Hebei University of Technology; 

关键词：

Heat source model;  Pulsed current gas tungsten arc welding;  Numerical simulation;  Welding temperature field; 

期刊名称：

Journal of Materials Processing Technology

i s s n：

0924-0136

年卷期：

2013 年 213 卷 12 期

页   码：

2329-2338

页   码：

摘   要：

A time-dependent welding heat source model, which is defined as the dynamic model, was established according to the characteristic of PCGTAW. The parabolic model was proposed to describe the heat flux distribution at the background times. The recommended Gaussian model was used at the peak times due to the bell-shaped temperature contour. The dynamic welding heat source was composed of these two models with a function of time. To assess the validity of the dynamic model, an experiment was conducted in which the pulsed current gas tungsten arc deposits on the plate. From the comparison of the experimental and the simulated values, it can be concluded that the dynamic heat source model, which uses the parabolic model at the background time, is more realistic and accurate under the same welding conditions.