Change polarity on older mac mig welder - Welding Tools

SOURCE: mig welder powers up but only clicks when trigger is squeezed

1] Remove the power cable from the power. (socket on the wall) remove the top cover there should be a fuse located on the wiring panel.
2] perform all your house keping- like, all plugs and socket are tight, the correct contact tip with the the right wire size, roller/s are also the correct ones for the wire size and are turning if they are turning but not feeding the wire, then, the rollers need to be tightend , get back to us.

SOURCE: How do I stop splatter

Is your material clean? A little bit of foreign material on it will make a big difference. Mig welding can't stand rust, oils, excessive mill scale, moisture, and paints.Is your wire clean, no rust on it, and dry? Another problem could be magnetic arc blow.That is when your welding, and you get huge amounts of spatter blowing from your puddle as you weld. To stop that, move your ground to a different location, or move your material to a different angle.Its caused by the magnetic energy created from the current running from your ground, through your material and into your arc. Try Pam cooking spray for anti spatter.

SOURCE: I have a BOC 250R

Yes, swapping leads will reverse the polarity....

heatman101

David Soto

• 414 Answers
• Posted on Jun 26, 2011

SOURCE: I have an older Hobart

Hi:

have you tried to by-pass the gun switch by disconnecting the gun cable (not the lead) and using a paper clip to by-pass the gun?. If the motor turns then you need to replace the gun switch if not probably the PC board fuse it's blown.

David Soto

• 414 Answers
• Posted on Sep 07, 2011

SOURCE: How do you switch the polarity switch on the 115

Hi:
Disconnect you ground clamp form the negative side pole and switch it to the positive pole, same for the gun disconnect the from the positive side and switch it to the negative pole.
Good luck.