Why can't the welding machine be started with a new relay?

There may be many reasons why the welding machine can't start, including:

The relay is not connected correctly, so it is necessary to confirm whether the relay is connected correctly.

There is something wrong with the relay, so it is necessary to check whether the relay works normally.

The power cord or terminal is loose or falling off, so it is necessary to check whether the power cord is connected correctly.

Other components inside the welding machine are faulty, so it is necessary to further check other circuit components inside the welding machine.

It is recommended that you check these potential problems and take appropriate measures as needed. If you are not sure what the problem is, it is best to contact professional maintenance personnel for maintenance. Before carrying out any maintenance work, be sure to pay attention to safety and ensure that the welding machine has been turned off and unplugged.