(A) arc welding machine
Current generated by the different types can be divided into DC and AC arc welder arc welding machine into two categories.
(1), AC arc welding machine is actually in line with the requirements of step-down transformer, as shown in Figure 16-3. It 220V or 380V supply voltage down to 60-80V (ie welding load voltage), which meets the needs of arc, but also to ensure personal safety. Welding, the arc voltage will drop to normal operation automatically when the operating voltage required for 20-30V, stable arc burning to meet the requirements. Output current is alternating current, according to the needs of Welding Electrode Manufacturers , the current is transferred from the tens of hundreds of amperes amperes. It has a simple structure, convenient, low cost, material saving, easy to use reliable and maintenance advantages, disadvantages arc stability is not as good as DC arc welding machine, for some types of electrodes do not apply.
(2), DC arc welding machine can be divided into two categories: direct current arc welding generators and welding rectifiers.
DC arc welding generator is composed of AC motors and DC generators, as shown, electric motor driven generator running through to meet the Carbon Steel Electrode requirements issued by the DC. Can be characterized by a stable DC, therefore, easy arc, arc stability and weld quality is good, but the structure is complicated, more difficult to manufacture and maintenance, high cost, use noise. Therefore, it is generally used in the current special requirements of the occasion.