How is the direct connection and reverse connection of the direct current arc welding machine? On what occasions are they used?
DC arc welding machine is connected and reverse: positive connection method is connected with the cathode welding, the workpiece is connected with the anode, reverse on the contrary, the general use of basic electrode requirements using reverse DC, DC method with acid electrode, alkaline electrode if the positive connection method, stability of arc welding process is not stable. For.
By using the direct current connection method, the workpiece is connected to the anode. Because the temperature in the anode zone is higher than that in the cathode zone, the workpiece is deep melted and the welding rod melts slowly. It is suitable for welding the workpiece with thicker thickness.When the DC reverse connection is used, the welding rod meets the anode, and the welding rod melts faster, while the workpiece has a lower melting depth. This method of arc is relatively stable, and it is difficult to generate hydrogen pores. Suitable for welding thin steel plate, nonferrous metal, stainless steel, surfacing welding and welding of basic welding rod.
The positive connection and reverse connection are relative to the workpiece, and the positive connection is the output of the welder, the positive electrode (see the right picture), and vice versa.
