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  1. #1
    Join Date
    Jan 2008
    Location
    east central il
    Posts
    23

    Red face bobcat 225 and tig alum

    need to tig an aluminum oxygen cylinder base back on to cylinder what setting to use with weldcraft tig torch and argon gas.i know i have to scratch start on a piece of copper, it is 3/16 thick aluminum. machine is bobcat 225NT

  2. #2
    Join Date
    Apr 2008
    Posts
    171

    Default

    you need a high-frequency arc starter and stabilizer
    like the miller HD-251 to weld aluminum with the bobcat
    they run around $1000.00

  3. #3
    Join Date
    Dec 2007
    Location
    alabama
    Posts
    749

    Default

    Why copper?
    2, XMT's 350 cc/cv
    1, BOBCAT 250
    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

  4. #4
    Join Date
    Jan 2008
    Location
    Colorado
    Posts
    673

    Default

    I hope you're only making something decorative. There's NO welding allowed on any high pressure cylinder. Not even during manufacturing.
    RETIRED desk jockey.

    Hobby weldor with a little training.

    Craftsman O/A---Flat, Vert, Ovhd, Horz.

    Miller Syncrowave 250.

  5. #5
    Join Date
    Jan 2008
    Location
    east central il
    Posts
    23

    Default conversion to cold smoker

    Quote Originally Posted by Craig in Denver View Post
    I hope you're only making something decorative. There's NO welding allowed on any high pressure cylinder. Not even during manufacturing.
    it is to be part of a cold smoker no pressure

  6. #6
    Join Date
    Jan 2008
    Location
    east central il
    Posts
    23

    Default why copper

    Quote Originally Posted by fabricator View Post
    Why copper?
    it supposedly dont eat the tungsten

  7. #7
    Join Date
    Dec 2007
    Location
    alabama
    Posts
    749

    Default

    Thats a new one for me.I think you were misinformed.However you will need high frequency a/c in order to tig aluminum.
    2, XMT's 350 cc/cv
    1, BOBCAT 250
    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

  8. #8
    Join Date
    Dec 2007
    Location
    Beech Island South Carolina
    Posts
    11

    Default alum welding

    You can use Heilum to weld alum But it's not as clean.Rent a bottle for a month will it be cheaper.

  9. #9
    turbo38t Guest

    Default

    You can DC tig aluminum......why wouldn't it work with the Bobcat?
    Quote Originally Posted by fabricator View Post
    Thats a new one for me.I think you were misinformed.However you will need high frequency a/c in order to tig aluminum.

  10. #10
    Join Date
    Nov 2006
    Location
    Lake of the Ozarks MO
    Posts
    3,558

    Default

    Quote Originally Posted by retiredIW View Post
    it supposedly dont eat the tungsten
    I do not doubt one bit that there is a place for the copper thing...I have heard it as well but it is not used for aluminum. Trust me I did about 10 years on a 225NT Bobcat with an old Linde Freekbox and a #26V torch with a valve and pure argon. That is the minimum you will get by with unless you can score lab grade helium for using DC EN.
    You should just find someone with a spoolgun or hire a pro to tig it for just welding one item.
    Bring your stuff and come on down to my shop and I'll do 'er for free
    I like to shoot the bull with old welders

    www.facebook.com/outbackaluminumwelding
    Miller Dynasty 700...OH YEA BABY!!
    MM 350P...PULSE SPRAYIN' MONSTER
    Miller Dynasty 200 DX "Blue Lightning"

    Miller Bobcat 225 NT (what I began my present Biz with!)
    Miller 30-A Spoolgun
    Miller WC-115-A
    Miller Spectrum 300
    Miller 225 Thunderbolt (my first machine bought new 1980)
    SPEEDGLAS 9100XX

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