Variation of Temperature, Pressure, Potential and Current Density in Cold Metal Transfer (CMT) Welding Process

Abstract : A unified comprehensive mathematical model was developed to simulate the transport phenomena occurring in the cold metal transfer welding process (CMT). It includes the arc plasma, droplet generation, velocity, current density, Temperature distribution, onto the workpiece. The continuum formulation is used for the conservation equations of mass, momentum, and energy in the arc plasma region. The distribution of pressure, temperature, and flux for the plasma zone are all calculated as a function of time. It is also observed that these distributions for a moving heat source are non-axisymmetric and the peaks shift to the arc moving direction. It is observed that the temperature obtained in the Cold metal transfer welding process is less than the conventional welding methods like GMAW, GTAW, SMAW, and SAW.