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Thread: Mig gun problem

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  1. #1
    Join Date
    Mar 2013
    Posts
    25

    Default Mig gun problem

    I have a Miller 35s with a Bernard gun. How do I know what model it is. The reason is that the gas nozzle and diffuser I think need to be replaced. The contact tip just started pushing out when I go to weld and it seems that it burns back and welds the tip. I went to clean the nozzle with a plumbing pipe cleaner and cleaned the wrong end. The nozzle seems to have some sort of resin as the insulator and I think it is shorting out. Help !!! Tom

  2. #2
    Join Date
    Oct 2005
    Location
    North Central Indiana
    Posts
    782

    Default

    Show a picture of the gun and any adapters that may have been needed to connect the gun to the machine so guys that might know can help you.

    Here is Bernards guns and parts

    http://www.millerwelds.com/products/.../bernard-guns/

  3. #3
    Join Date
    Mar 2013
    Posts
    25

    Default

    Not sure how to post pics. The machine is old and the gun is the replacement model and there's no markings other than the name. Would I be able to bring the parts to have matched up. What would cause the burn back to happen as soon as I pull the trigger, when just before I cleaned the wrong end of the nozzle, it worked. Do you think it's shorting out because I cleaned the insulating material away.

  4. #4
    Join Date
    Oct 2005
    Location
    North Central Indiana
    Posts
    782

    Default

    Quote Originally Posted by concreteguy View Post
    Not sure how to post pics. The machine is old and the gun is the replacement model and there's no markings other than the name. Would I be able to bring the parts to have matched up. What would cause the burn back to happen as soon as I pull the trigger, when just before I cleaned the wrong end of the nozzle, it worked. Do you think it's shorting out because I cleaned the insulating material away.
    I'm no repair guy concreteguy, I hate to give ideas that could get you hurt or your equipment..... (but if it was me) I would squeeze the trigger with the nozzle
    off and see if it shorts out at the tip. Again the safest way would be to take the gun to your welding supply.... call first. If there is a gun adapter let them know, they may or may not want you to bring it with you so they can match things up.

  5. #5
    Join Date
    Aug 2010
    Location
    Los Angeles
    Posts
    1,165

    Default

    Many nozzles are built with insulation between the thread and body. If you can take your torch and nozzle to an LWS, they may be able to match it up for you.
    Nothing welded, Nothing gained

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  6. #6
    Join Date
    Jul 2010
    Location
    Four Flags city
    Posts
    301

    Default

    If you have a Centerfire style gun the nozzle holds the contact tip in place and need to replace or tighten the nozzle.If you have an older style gun with oblong contact tip,1/4? turn tightens the tip into the diffuser,change it out to Centerfire.

  7. #7
    Join Date
    Mar 2013
    Posts
    25

    Default

    I went to the local welding/gas supply and they matched the diffuser and nozzle. I went and installed them and all seems to be well. It being and old machine-1973- would have hated not to be able to get the parts, It still welds fairly well. At least as good as I can do. Thanks for the help

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