Numerical analysis of heat and mass transfer process of welding arc during gas pool coupled activating TIG welding

A mathematical model is established to reveal heat and mass transfer process of gas pool coupled activating TIG welding arc.The coupling of welding arc with cathode is numerically simulated by using simplified cathode sheath model.By means of computation,the characteristic parameters of welding arc such as the plasma temperature,the distributions of oxygen,velocity of plasma,electric potential,and current density are obtained and compared with those of the arc of traditional TIG welding.The results show that oxygen is mainly distributed in the arc periphery,and only a small amount diffuses into the arc,compared with the arc of TIG welding,the arc temperature and velocity of plasma will increase,and the peak values of current density,heat flux,and arc pressure at anode surface increase under the same welding conditions.