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Please help - how do you preheat aluminum for mig ?????

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  • Please help - how do you preheat aluminum for mig ?????

    Would like some advice on preheating aluminum bar.
    Tack welding 1/4 inch aluminum bar for tack weld at T joint.
    How would I preheat for mig welding with a passport plus using spool gun
    an argon.

    Anyone have experience welding aluminum bar with mig ?

  • #2
    Please help - how do you preheat aluminum for mig ?????

    That thin you really don't need a preheat just turn it up and go.


    • #3
      Originally posted by Stu Miles View Post
      Anyone have experience welding aluminum bar with mig ?
      35 years worth. I use a propane torch...Bob


      • #4
        Hi Bob

        Hi Bob
        I guess I should have asked first -
        Do I need to preheat the 1/4 inch aluminum bar ?
        using passportplus/spoolgun/110.
        I've been told it's not possible as it will be too cold,
        then told it would melt too fast.

        Thanks for reply,


        • #5
          Don't know about your passport as i have never used one but you will just have to try a couple of small chunks of what you will be doing. That would be the best way. Just my thoughts...Bob


          • #6
            Even with heat, you are pushing the passport at 110. It all depends on how practice pieces work out.


            • #7
              I had to weld 7" x 7" x 8' chunks of aluminum to 4x4x1/4" TS and used a propane rose bud and a temp stick, I brought it up to 450 degrees before welding it with my push pull set up.


              • #8
                Try a test piece first. If the bead profile is too high, then preheat and try it.
                Some things need preheat just to get the bead to flow out decent.
                I like to use the AO torch and smoke it (with the soot) myself. Then heat until smoke is gone. Works good for me.


                • #9
                  Mapp gas burns hotter. Costs more but works better.


                  • #10
                    Make sure if you are preheating or welding to insulate it, if you are welding on a steel table, the steel really sucks the heat out of aluminum and makes it difficult to weld


                    • #11
                      Thank you

                      Thanks - the advice and tips here are really helpful,
                      appreciate your time replying.


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