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The growing weld

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  • The growing weld

    I did a search and could not find anything so here is my question....
    I just bought a MM180 with auto set and love the thing, when i weld it will be fine but right at the end of the weld it starts to grow like some kind of mutant weld. When i grind the "mutant" weld its hollow inside so its kinda like a bubble.

    All my metal is clean new metal, its not rusty or oily or anything...
    Thanks for any info everyone.

  • #2
    oxygen contamination. could be wrong gun angle,not enough sheilding gas,too far out with nozzle.


    • #3
      What do you do?

      When finishing your weld do you simply stop or do you back weave? If your bead run is good than your settings are probably good.


      • #4
        back weave? sorry i dont know what that is. and yes when i come to the end of my weld i do just stop. should i turn the gas up? im running at bout 20.


        • #5
          Are you talking Mig !!

          If you don't keep the Mig bead moving when you stop there is a mutant bubble.


          • #6
            back'em up

            back weave: when you get to the end of the bead, don't quit. Reverse direction and weld back over your bead about 1/2".


            • #7
              What they said..

              If you just stop you're going to see this happen, I don't have to explain the back weave as Craig in Denver summed it up pretty good. In addition to your back weave, pull your gun away at the opposite direction with a flip of your wrist.

              Hope this helped.



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