1. New or long unused welding machine, often due to moisture so that the insulation resistance between the winding, winding and the insulation resistance between the housing is greatly reduced, in the beginning of use is prone to short circuit and grounding, resulting in equipment and personal accidents. Therefore, before using the application of shaking table to check its insulation resistance is qualified.

2. Start the new welding machine before, should check whether the electrical system contactor part is good, think normal, can be started under no load test run. Prove that there is no hidden electrical problems, before the test run under load, and finally can be put into normal operation.

3. DC welding machine should be rotated in the prescribed direction, for with ventilation fan to pay attention to the fan rotation direction is correct, should be used by the upper blowing out. To achieve the purpose of cooling the welding machine.