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  • Re: TIG setup for 20 gauge mild steel?

    From N Stewart@21:1/5 to Mike Graham on Mon Dec 26 19:18:07 2022
    On Thursday, August 29, 2002 at 3:16:16 PM UTC-7, Mike Graham wrote:
    --
    =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Mike Graham | Fighting the good fight against porosity, [email protected] | lack of fusion, and people who constantly <http://www.metalmangler.com>| try to correct the spelling of 'weldor'.

    I have some previous TIG welding experience with 1/8" + material. I am now moving to 20ga sheet metal for some auto body work. Here's my question:
    Would it work to weld 20 ga steel with .040 tungsten and a #4 cup? My thought is a small controlled area would be easier to work withing than a 1/16 tungsten and a 3/4" + Furick cup.
    All experienced responses are appreciated.

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  • From Snag@21:1/5 to N Stewart on Mon Dec 26 21:51:49 2022
    On 12/26/2022 9:18 PM, N Stewart wrote:
    On Thursday, August 29, 2002 at 3:16:16 PM UTC-7, Mike Graham wrote:
    --
    =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- >> Mike Graham | Fighting the good fight against porosity,
    [email protected] | lack of fusion, and people who constantly
    <http://www.metalmangler.com>| try to correct the spelling of 'weldor'.

    I have some previous TIG welding experience with 1/8" + material. I am now moving to 20ga sheet metal for some auto body work. Here's my question:
    Would it work to weld 20 ga steel with .040 tungsten and a #4 cup? My thought is a small controlled area would be easier to work withing than a 1/16 tungsten and a 3/4" + Furick cup.
    All experienced responses are appreciated.


    MIG , .025 wire at about 30 amps . I'm not a weldor , I'm a cabinet
    maker with a metal addiction . Actually , if ya gotta TIG it I'd suggest
    you stay with the #6 cup and 1/16" tungsten . The amperage has a lot
    more to do with the weld than than the cup/tungsten size . 1/16" or .050
    filler , smaller is better ... too large filler sucks too much heat
    out of your puddle .
    But still , I'm not a weldor .
    --
    Snag
    "You can lead a dummy to facts
    but you can't make him think."

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  • From John B.@21:1/5 to [email protected] on Tue Dec 27 11:43:40 2022
    On Mon, 26 Dec 2022 19:18:07 -0800 (PST), N Stewart
    <[email protected]> wrote:

    On Thursday, August 29, 2002 at 3:16:16 PM UTC-7, Mike Graham wrote:
    --
    =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- >> Mike Graham | Fighting the good fight against porosity,
    [email protected] | lack of fusion, and people who constantly
    <http://www.metalmangler.com>| try to correct the spelling of 'weldor'.

    I have some previous TIG welding experience with 1/8" + material. I am now moving to 20ga sheet metal for some auto body work. Here's my question:
    Would it work to weld 20 ga steel with .040 tungsten and a #4 cup? My thought is a small controlled area would be easier to work withing than a 1/16 tungsten and a 3/4" + Furick cup.
    All experienced responses are appreciated.

    Years ago I was a USAF certified TIG (we called it "Heli Arc" :-)
    welder and I remember an old civilian welder that used to come in our
    shop got in an argument about how thin a piece could be welded. He
    ground a very long taper on the electrode and (I think) changed to a
    smaller cup and preceded to weld some stuff that was hardly thicker
    then newspaper :-)

    I'd give it a try with what I had, maybe tapering the electrode a bit
    more and weld some scrap pieces of what you intend to weld and then
    change to a smaller electrode and cup if that doesn't work.
    --
    Cheers,

    John B.

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  • From Jim Wilkins@21:1/5 to Mike Graham on Tue Dec 27 07:11:11 2022
    "N Stewart" wrote in message news:[email protected]...

    On Thursday, August 29, 2002 at 3:16:16 PM UTC-7, Mike Graham wrote:
    --
    =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Mike Graham | Fighting the good fight against porosity, [email protected] | lack of fusion, and people who constantly <http://www.metalmangler.com>| try to correct the spelling of 'weldor'.

    I have some previous TIG welding experience with 1/8" + material. I am now moving to 20ga sheet metal for some auto body work. Here's my question:
    Would it work to weld 20 ga steel with .040 tungsten and a #4 cup? My thought is a small controlled area would be easier to work withing than a
    1/16 tungsten and a 3/4" + Furick cup.
    All experienced responses are appreciated.

    -----------------------

    I've MIG welded Ford and thinner Honda sheet metal and TIG welded 0.025"
    wall aircraft tubing (for practice), though neither enough to consider
    myself skilled. The professional advice I received was to go with MIG for
    auto body, one reason being to protect the electronics from TIG's high frequency, high voltage. Another is the low penetration and wide weld bead
    from pushing the MIG gun. You could look for advice on TIG welding aircraft tubing.

    I used the same 1/16" tungsten and gas lens on the 4140 tubing that I'd used for thicker stock, without a problem. This was in night school under expert supervision, with my own Lincoln Square Wave 175 since it's what I'd use at home.
    jsw

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