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Miller dimension NT450

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  • cruizer
    replied
    There is crud (likely teflon tape) in the feeder screen where the gas comes in. Quite common.

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  • ryanjones2150
    replied
    Probably be an easy fix for the tech guys anyway.

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  • angrybird61
    replied
    Yeah that's what I said. Lol. His response was," it wasn't your 8000 dollars for the machine". My rebuttal was "it wasn't yours either". He walked away a little angry.

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  • ryanjones2150
    replied
    Ah cmon! Tell your boss to grow a pair! He's no fun.

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  • angrybird61
    replied
    I checked for debris, there was none. I also unscrewed the hose from machine and it does get uninterrupted flow. I did notice a clicking from inside the machine when the flow stops. Sounds like a relay or solenoid. An airgas rep is gonna pick up the machine and check it for us. Our boss doesn't want us to open it up for warranty reasons.

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  • digr
    replied
    Take the hose off the reg and turn on the gas and see if you get flow if so take the hose off at the machine and try again, at least you will isolate the problam

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  • H80N
    replied
    Originally posted by ryanjones2150 View Post
    I'm kind of paranoid about getting crap in the lines. Even if I disconnect the fitting end from the machine, I purge the lines before I reconnect them.
    I have been bitten a few times over the years... a victim of my own brainfade or laziness.... where I forgot to crack the valve to blow out debris....
    and drove a slug of crud into the regulator...

    https://www.youtube.com/watch?v=x4Aoanbe0NI

    Some of the newer regulators have a sintered bronze filter in the nipple to prevent this type of damage

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  • ryanjones2150
    replied
    I'm kind of paranoid about getting crap in the lines. Even if I disconnect the fitting end from the machine, I purge the lines before I reconnect them.

    Leave a comment:


  • H80N
    replied
    Originally posted by angrybird61 View Post
    I'll have to listen for a solenoid tomorrow. I can hold down the trigger for about 3 secs before gas stops flowing. I can count how long it takes gas to stop and it's the exact same amount of time each time. At first I thought there was a sensor of some sort that would stop the gas from flowing if there was no arc. A coworker noticed it when he was messing with wire speed. But we started running beads, and the gas stops flowing while welding too.
    Was not kidding about the possibility of crud... that is why you are supposed to crack the tank valve for a moment to blow out any debris that may have deposited in transport...before reconnecting the regulator...
    ...........the described symptoms would fit

    Originally posted by H80N View Post
    Maybe a piece of lint/crud/fluff between the gas bottle and the regulator..... not uncommon if somebody was a little sloppy when they changed out the bottle
    Last edited by H80N; 11-30-2015, 06:58 PM.

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  • angrybird61
    replied
    I'll have to listen for a solenoid tomorrow. I can hold down the trigger for about 3 secs before gas stops flowing. I can count how long it takes gas to stop and it's the exact same amount of time each time. At first I thought there was a sensor of some sort that would stop the gas from flowing if there was no arc. A coworker noticed it when he was messing with wire speed. But we started running beads, and the gas stops flowing while welding too.

    Leave a comment:


  • ryanjones2150
    replied
    can you hear the solinoid clicking on and off? Surely that machine has one.

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  • H80N
    replied
    Maybe a piece of lint/crud/fluff between the gas bottle and the regulator..... not uncommon if somebody was a little sloppy when they changed out the bottle

    Leave a comment:


  • angrybird61
    started a topic Miller dimension NT450

    Miller dimension NT450

    Hi everyone, I'm new here and have done a search with no results, so now I'm asking for your help. At work we have a Dimension NT450 as stated in the title. The shielding gas stops coming out after about 3 seconds of welding, when on the mig setting. The cylinder is full and the regulator is set to about 25 or so cfm. We are in an enclosed shop so wind is not an issue. The ball inside the flowmeter completely drops and the weld becomes very porous after a few seconds after holding the trigger? Is there a gas solenoid inside the machine that may be causing this problem? Any help would be appreciated. Thanks in advance.
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