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Bad diode? pull the trigger it goes hmmmmmm!! then blows the breaker. 75 amp tote mig

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  • badenhop
    badenhop May 11, 2010

    Make, model, description of how we're trying to weld? Are you able to strike an arc? Did you just buy it?

  • Eric ersland Apr 03, 2012

    If it's a carry unit they sometimes get shorted from welding current to welder chassis or drive motor,and other circuits thru a forign object bouncing around in drive roll/spool compartment wire can also loop off spool in this scenario locking it up and shorting, once trigger is pulled the entire spool of wire is hot.if trigger wires out to trigger shorts to welding current any where in cable hose or gun this can blow breakers too?

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  • 8 Answers

Could be. Could also be a shorted winding in the transformer. I have seen the aluminum windings burn and melt on some welders.
Over the years of messing with welders I have hardly seen many bad diodes....it is usually something else.
To check the diodes, you will need to disconnect them inside and use an ohm meter. Set your ohm meter on a low resistance setting and check them in both directions. If you check a diode and it is like you touched the meter leads together (dead short) them yep it needs replacement. When you test them you should read more resistance one direction than the other, if it reads like it is an open circuit like you didn't touch the leads, then test on a higher resistance setting, if you never do show a reading (infinite resistance) then it needs replacement.

Posted on May 24, 2009

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