sealey 130 mig welder

[Lightfellows]

Hi Can anyone assist
My welder arcs for 1 or 2 max seconds then stops. Wire keeps coming out.

Any idears ?
Martin

 

[Hutcho]

Checked your earth connections

 

[eddie49]

Hello and welcome to the Forum.

Do you get the same fault on all settings of the "1/2" and "Min/Max" switches?

Power for the wirefeed motor comes from the DC welding output, tapped-off directly at the rectifier and then fed to the motor speed controller. The fact that the wire continues to feed means that the basic output remains OK, but the high current needed for welding is not reaching the workpiece. As Hutcho suggested, a poor connection somewhere in that path may be causing a high resistance. The initial flow of current causes heat, which will increases the resistance so welding stops.
Check all the connections to the heavy thick wires, from the secondary of the transformer to the rectifier, the inductor ( choke coil ), the torch, and the work return cable and clamp. Open, clean, and re-tighten the bolted connections, and particularly check the spliced clamped joint to the work return cable. You may have to cut open the sleeving over that joint to see it.