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Thread: Black bead

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  1. #1

    Default Black bead

    I'm new to tig welding and I'm welding 16 Ga 304 s/s. The bead looks ok but the bead is black not the nice coppery brass colored that I see when other people weld S/S, is it too much heat or not enough or something toatally different. Please help. Thank You.

  2. #2
    Join Date
    Dec 2007
    Location
    alabama
    Posts
    746

    Default

    Can be 1 or all of these things: Too hot and/or too slow travel speed; Wrong gas and/or wrong cup angle; Gas lines not sealed,leaking argon or sucking in air.
    2, XMT's 350 cc/cv
    1, XMT 350 vs
    1, TRAILBLAZER 302
    1, MILLER DVI
    1, PASSPORT PLUS
    1, DYNASTY 200 DX
    1, MAXSTAR 150 STL
    1, HOBART CHAMP
    1, HF-251 BOX
    1, S-74d
    1, S-75DXA
    2, 12-RC SUITCASES
    2, 30 A spoolguns

  3. #3
    Join Date
    Dec 2008
    Posts
    12

    Default

    Crystallization... you're probably cooking it!

    Sounds like you're 'too hot' and/or going to slow. Back-purging of some kind will help with both sides of the weld, but is intended for the 'back side'.. (obviously). I've had some success with COPPER behind the S.S. in order to act as a 'heatsink'.

    Also, Try again with the tip of your Tungsten 'squared off' just the tiniest bit... Doing this will make the ARC somewhat wider and penetration won't be as 'narrow', thus spreading the heat out a bit more...

    Good Luck

  4. #4
    Join Date
    Jul 2007
    Posts
    241

    Default

    Im No expert at Stainless,but the only time Ive gotten a black bead is when I put way too much heat into the part.Mike

  5. #5
    Join Date
    Aug 2010
    Location
    Wisconsin
    Posts
    20

    Default

    It's either too much heat caused by slow speed or welding to hot. It could also be not enough gas coverage. Bottle is low or welding in windy conditions.

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