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  • Tig cup sizes.

    What are the rules regarding electrode size when matching with cup size.
    I have found nothing written in a Miller book that explains this subject.

  • #2
    Originally posted by jmpgino View Post
    What are the rules regarding electrode size when matching with cup size.
    I have found nothing written in a Miller book that explains this subject.
    It's not about electrode size, rather than weld size. The bigger/wider the weld, the more coverage you need. Travel speed is a factor too. Fast travel can leave molten puddle uncovered, so an increase in trailing gas is desired. A bigger cup can help.
    Nothing welded, Nothing gained

    Miller Dynasty700DX
    3 ea. Miller Dynasty350DX
    Miller Dynasty200DX
    ThermalArc 400 GTSW
    MillerMatic350P
    MillerMatic200 with spoolgun
    MKCobraMig260
    Lincoln SP-170T
    Linde UCC305 (sold 2011)
    Hypertherm 1250
    Hypertherm 800
    PlasmaCam CNC cutter
    Fadal Toolroom CNC Mill
    SiberHegner CNC Mill
    2 ea. Bridgeport
    LeBlond 15" Lathe
    Haberle 18" Cold Saw
    Doringer 14" Cold Saw
    6 foot x 12 foot Mojave granite

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    • #3
      Per the miller TIG handbook, page 61:

      The inside diameter of the gas cup should be at least threetimes the tungsten diameter to provide adequate shieldinggas coverage. For example, if the tungsten is 1/16" in diameter,the gas cup should be a minimum of 3/16" diameter.Figure 8.2 is an example of gas cup size and torch position.

      http://www.millerwelds.com/resources/TIGhandbook/


      And shovelon's got it right for how large of a cup to go with.

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