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I have a mastercraft arc welder that turns on but won't arc the overload light is not on or enything

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I'm not familiar with this model and I don't know it's age, but as a general check item on any welder, make sure your welding leads are in good shape and that your earth clamp is actually connecting to it's lead. They can burn and tarnish with use and fail to connect. Check likewise the lead connection into the electrode holder. Check their attachment to the welder unit too. There may be a thermal overload protection fuse/device/switch inside the unit which may need to be reset/replaced if you've worked it heavily recently.
If the welder is TOTALLY silent when you switch it on, it may indicate a transformer failure for some reason, usually there is a little bit of buzz or hum. Within safe limits (bear in mind there are dangerous high voltages inside the welder) you might use a simple multi-meter to check that you are getting transmission of power from A to B throughout the unit to the work piece, and that you've got adequate voltage arriving at the work. More safely, with input power totally switched off and unplugged, you can use a multi-meter to check continuity of circuits through the welder to make sure there isn't a break in connection somewhere from a component fault or failure.

Posted on Dec 02, 2014

  • Bob Jones Dec 02, 2014

    I'm not familiar with this model and I don't know it's age, but as a general check item on any welder, make sure your welding leads are in good shape and that your earth clamp is actually connecting to it's lead. They can burn and tarnish with use and fail to connect. Check likewise the lead connection into the electrode holder. Check their attachment to the welder unit too. There may be a thermal overload protection fuse/device/switch inside the unit which may need to be reset/replaced if you've worked it heavily recently.

    If the welder is TOTALLY silent when you switch it on, it may indicate a transformer failure for some reason, usually there is a little bit of buzz or hum. Within safe limits (bear in mind there are dangerous high voltages inside the welder) you might use a simple multi-meter to check that you are getting transmission of power from A to B throughout the unit to the work piece, and that you've got adequate voltage arriving at the work. More safely, with input power totally switched off and unplugged, you can use a multi-meter to check continuity of circuits through the welder to make sure there isn't a break in connection somewhere from a component fault or failure.

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Has the unit ever overheated or gone past the duty cycle while welding causing it to shut down?

Posted on Nov 27, 2014

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Posted on Jan 02, 2017

kel1guy2002
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SOURCE: MG 255 MIG welder purchased

Hi and welcome to FixYa, I am Kelly
This is from memory and not out of any manuals so if the solution does not fit your unit feel free to see other Experts advice.
My experience as a welder if you have wire feed and gas is that there is a problem with the ARC voltage. Most units have a potentiometer (pot / dial) to control the ARC voltage. If the pot wiper is dirty you may not be getting the proper ARC voltage. Move the ARC voltage dial rapidly full range several times, (20 or more). This usually cleans off the pot wiper arm and the unit will operate normally again.

Is this a Cornwell unit? There are many different MIG 255 units out there and I did not equate the MG255 to a particular brand. I did see Cornwall nmentioned 2 times.

Even if this does not work for you I would appreciate any future feedback even if your seeking other advice.

Kelly

Posted on Jul 24, 2011

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