Analysis of the Arc Dynamic Process in GMAW Under the Influence of Pulsed Magnetic Field

In the gas metal arc welding process with short circuiting transfer mode has un-regularity,poor arc stability,larger spatter,and poor weld form,the horizontal pulsed auxiliary magnetic field in the short circuiting transfer welding process was established.According to short circuiting transfer period T_c and its coefficient of variation CV,optimize the applied auxiliary magnetic field and the MIG/MAG welding process parameters.The controlled auxiliary magnetic field can reduce both of the arc short circuiting transfer period T_c,and the coefficient of variation CV.When the statistical average of the pulsed magnetic field duration t_on take value for the specific welding parameters short circuiting time T₁,making short circuiting transfer period tends to be uniform.The experiments show that make the applied magnetic field strength appropriate arc short circuiting transfer period T_c and the coefficient of variation CV lower,it can accelerate the disconnection of the short circuiting transfer liquid bridge,reduce the short circuiting peak welding current,thereby reducing the energy accumulation at the end of the short circuiting transfer,so as to reduce the electrical explosion spatter loss rate of the process and keep the metal transfer stable.