MULTI-HEAD DC AND AC WELDER

The utility model relates to a multi-head direct current and alternate current welding machine, which belongs to a manual arc welding machine. The utility model is characterized in that the number of the welding machine head is 3*n (n is from 1 to 5); the electric current polarity of each head can be converted into the alternate current or the direct current for 3*n welders to carry out alternate current welding or direct current welding at the same time. A power transformer of the utility model is provided with 3*n groups of uniphase output and each group of output is the power supply of a one head direct current and alternate current welding machine; when two direct current output ends are in joint in parallel, the two direct current output ends can be used as a carbon planer; when matched with resistors, the output end can be used a heating power supply for work pieces to meet various working conditions of the manual arc welding.