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  • Tungsten Problem (?)

    A friend has let me use his Lincoln Tig 300/300 (the later model, not the old timer) to practice on at his shop and we are having a problem in that the green tungsten won't form a ball. Even he can't get a ball to form. It does weld, but not as smoothly as it should. The arc can go along fine then it becomes finicky and wanders (looks like arc blow in SMAW). I'm practicing on clean (3M Roloc polish pads) 1/8 aluminium with 3/32 Weldmark electrodes using straight Argon at 15 cfh. I'm on AC mid-range, current range 7, with start "ON" (constant). I have no idea what those setting translate to in amps. The torch is a Weldcraft water cooled with a #6 collet (no gas lens). The ground is solid. I think the problem is in the electrode but even if I switch to a new one the problem again develops. Any ideas? Thanx

  • #2
    Originally posted by idahoguy View Post
    A friend has let me use his Lincoln Tig 300/300 (the later model, not the old timer) to practice on at his shop and we are having a problem in that the green tungsten won't form a ball. Even he can't get a ball to form. It does weld, but not as smoothly as it should. The arc can go along fine then it becomes finicky and wanders (looks like arc blow in SMAW). I'm practicing on clean (3M Roloc polish pads) 1/8 aluminium with 3/32 Weldmark electrodes using straight Argon at 15 cfh. I'm on AC mid-range, current range 7, with start "ON" (constant). I have no idea what those setting translate to in amps. The torch is a Weldcraft water cooled with a #6 collet (no gas lens). The ground is solid. I think the problem is in the electrode but even if I switch to a new one the problem again develops. Any ideas? Thanx
    Your HF(spark switch?) should not be on start, it should be on AC continuous. The switch should have 3 positions, start, on, and continuous(AC).

    I bet the points inside the machine are shot now too. I would clean and regap your points, then put the HF on the correct setting and have another go.

    Good Luck.
    Last edited by shovelon; 12-30-2012, 02:49 PM.
    Nothing welded, Nothing gained

    Miller Dynasty700DX
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    MillerMatic200 with spoolgun
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    • #3
      I just pulled this manual and it is a bit confusing. I does mention something about failing PFC capacitors. You may want to have them checked.

      http://www.lincolnelectric.com/asset...oln3/im349.pdf
      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

      Comment


      • #4
        Thanks for the quick responses. Pg 7 of the manual (IM349) says the "SPARK" switch should be set to "ON" for aluminium. I don't have the right equipment to check the capacitors and I know from my military experience that can be risky. Is that the case here?

        Comment


        • #5
          Originally posted by idahoguy View Post
          Thanks for the quick responses. Pg 7 of the manual (IM349) says the "SPARK" switch should be set to "ON" for aluminium. I don't have the right equipment to check the capacitors and I know from my military experience that can be risky. Is that the case here?
          I believe it is rather simple. Like looking them over for damage and take a voltage reading with a volt/amp meter. But looking over the inside and blowing out is always a good idea.
          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

          Comment

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