Gas Nozzle, which type for MIG welding ALU ?

  1. SV1BDO

    SV1BDO Member

    Messages:
    101
    Location:
    Greece, Egio City
    The Polish e-shop weldes.de has 3 different types of gas nozzles for the MB-15 torch,
    Conical (narrow 9,5mm dia), Standard (12mm dia) & Cylinder (wide 16mm dia). See bellow pics.
    Which one is best for welding ALU? Using my poor experience from TIG welding, where a wider gas nozzle produces better results, I conclude that the wider one (cylinder) will be the best for MIG welding ALU, or am I wrong ? Has anybody experience with narrow or wide nozzles ?
    10x-mb-15-gas-nozzle-shroud (1).jpg 10x-mb-15-gas-nozzle-shroud.jpg
     
  2. Hood

    Hood Forum Supporter

    Messages:
    9,117
    Location:
    Carnoustie, Scotland
    It is MB36 I use but I find the mid sized one (which you don't show) is best.


    ScreenHunter_733 Aug. 20 16.29.jpg
     
    SV1BDO likes this.
  3. Always use the biggest diameter you can, will improve gas coverage
     
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  4. SV1BDO

    SV1BDO Member

    Messages:
    101
    Location:
    Greece, Egio City
    Thank you both for your replies. I have to agree with @backpurge, as while I made some tests welding alu with a new double pulse MIG, I had black smoke only on the upper part of the welding (the bottom part was shiny clear), so I think that a wider nozzle will improve gas coverage.
     
  5. Hood

    Hood Forum Supporter

    Messages:
    9,117
    Location:
    Carnoustie, Scotland
    Be interesting to see. I thought that as well and ordered some straight ones in and got a disappointment :D
    Maybe I should have upped the flow but as I already work around the 17-20LPM I thought that should have been plenty.
    Maybe the smaller torch will make a difference though so looking forward to the results.
     
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