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Cracks in Aluminum Weld

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  • #16
    Originally posted by FATFAB View Post
    Where?

    1234567890
    Open eyes, look in picture.

    Griff

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    • #17
      Originally posted by Blackbird455 View Post

      See it now?

      The little black pepper looking flakes that float on the top of the puddle turn into stuff that looks like that. Also notice that the white "flash" on the outside of the bead is narrow, meaning only a small amount of DCEN in the cycle, balance adjustment might fix it, but like was said before, if it was plasma cut, there is alot of oxide present, and it needs to be removed before welding.
      Thanks for the back-up there blackbird.

      Griff

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      • #18
        Originally posted by jpmassey View Post
        Hmmm....I might be watching for enough penetration. This is my 1st major AL welding project, so I was excited just not to blow a 1/2" hole in it.

        I didn't think that preheating was required on such thin material?
        Pre-heat is not required if you have enough machine.

        "Hot cracking" ( that is what this crack is) is influenced by only three things:
        1. base alloy chemistry
        2. filler alloy
        3. joint design

        1 and 2 are self explanatory. 3 also includes amount of filler put into the joint.


        Griff

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        • #19
          Originally posted by jpmassey View Post
          Syncrowave 250dx
          I believe I was using pointed 2% thoriated.
          No pulse option.
          I just saw where you have a SyncroWave 250. That is plenty of machine for .125 and no pre-heat.
          5356 is the "correct" filler for the 5052 base but the 4043 "should" have been ok due to its higher silicon content. That is out of the "book" .

          Griff

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          • #20
            Looks like more filler is needed to offset the undercut.

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