Numerical Study of Plasma Arc Behaviors
Complete understanding the physical mechanisms of the plasma arc is critical to its application in welding of medium thickness plates. In this study, a mathematical model is developed to analyze the temperature, fluid flow, electromagnetic fields and pressure distribution in plasma arc welding. The correlations between the torch structure (nozzle diameter) and the plasma arc properties are analyzed qualitatively. The influence of the plasma gas flow rate on the plasma arc behavior is also simulated numerically. The temperature distribution and current density of the plasma arc change greatly with a little variation of the nozzle diameter and/or the plasma gas flow rate. Compare to the tungsten-inert-gas arc with almost same conditions, the heat intensity, fluid velocity and pressure at the anode surface rise by one order of magnitude for a plasma arc. The analysis results lay solid foundation for effective usage of plasma arc welding.
Arcs Plasma arc welding nozzle plasma gas flow rate
Jian Xiaoxia Wu Chuansong
MOE Key Laboratory for Liquid-Solid Evolution and Materials Processing, and Institute of Materials Joining, Shandong University, Jinan, 250061, China
国际会议
济南
英文
1-12
2012-08-24（万方平台首次上网日期，不代表论文的发表时间）