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  1. #1
    Join Date
    Nov 2012
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    West Central Mountains
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    Default 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. #2
    Join Date
    Aug 2010
    Location
    Los Angeles
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    1,158

    Default

    Quote 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 at 01:49 PM.
    Nothing welded, Nothing gained

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  3. #3
    Join Date
    Aug 2010
    Location
    Los Angeles
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    Default

    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

  4. #4
    Join Date
    Nov 2012
    Location
    West Central Mountains
    Posts
    29

    Default

    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?

  5. #5
    Join Date
    Aug 2010
    Location
    Los Angeles
    Posts
    1,158

    Default

    Quote 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

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