Because electric welding machines have special performance requirements. Electric welding machine is to use the high-temperature arc generated when the positive and negative electrodes are short-circuited, to melt the solder on the electrode and the material to be welded, so as to combine the contacted materials. Electric welding machine has special performance requirements and cannot be used as forming machine. Molding machine is to shape small particles or powdery materials to meet the requirements of particle shape before calcination.