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Comments on newbie SS tube weld

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  • Comments on newbie SS tube weld

    Am starting to tig weld a SS exhaust pipe.
    Name:  b9d7fd1eeab72bc985fb7926960f5913.jpg
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    Not pretty, but is anything obvious that can be changed to improve the weld ? Besides practice.

    3" Tube 1/16 wall 304 SS
    1/16 308 filler
    1/16 red tungsten
    pipe purged w. argon

  • #2
    Have you tried just fusion welding the tubes together?


    • #3
      Looks like you may be movig a bit fast, you may wish to slow the torch a little. Try to be more even with the filler dabs to get a nicer appearance as well. With stainless you should be back gassing the weld with argon or using flux to prevent the weld from crystalizing and becoming brittle.



      • #4
        Fusion , as in no filler ?
        Yes I tried that, welds look really nice , just didnt know it they would be strong enough to not crack down the road.

        I was trying to move as fast as possible, as I read somewhere that if you overheat SS it burns the chrome out & turns the weld black.
        Bead in pic has not been brushed yet, but definatly looks grey/black.
        Does the color look OK ?

        Am purging pipe with argon, It was nasty inside before ( my last post was about the sugaring inside pipe )



        • #5
          Yes, no filler. As long as the back purge or flux supports the root well the weld will be as strong as the base metal. If the root falls too much, causing a concave face, then the strength could be comprimised, but for an exhaust system, I don't think cracking would be an issue. I've never had problems.

          What kind of machine are you using to weld up the exhaust?


          • #6
            A syncrowave 200
            Have not changed any of the settings, just using the default adjustments on the machine.


            • #7
              how fast is your argon coming out from your torch?


              • #8
                Have flow set at 25


                • #9
                  cool...I guess just try what the other guys have mentioned...hmm...wonder if you are too heavy on the foot pedal?


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