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  1. #1
    Join Date
    Oct 2007
    Posts
    6

    Question sheild gas for weldin aluminum?

    ok...i've was trained to use 100% argon or 75 argon and 25 helium to tig weld and mig weld aluminum but i seen on another site won't say who but they say to use 75 helium and 25 argon...which helium is a hotter burning gas.. and is light but my ? are they right is that the right mixture to mig and tig weld aluminum with?

  2. #2
    Join Date
    Aug 2007
    Location
    arkansas
    Posts
    781

    Default

    you can, but DANG that is going to be expensive. i also dont see the problem with using 100% argon. its what i use daily on aluminum usually more than 3/8 thick. sometimes 2 inch thick, and dont have problems with penetration.
    welder_one

    nothing fancy, just a few hot glue guns for metal
    www.sicfabrications.com

  3. #3
    Join Date
    Mar 2006
    Location
    Ocean City, Maryland
    Posts
    951

    Default

    I use straight Argon for both MIG and TIG. Thickest I have welded aluminum is 1/2" and argon works great on all that I've used it for.
    Scott
    HMW [Heavy Metal welding]

  4. #4
    Join Date
    Nov 2006
    Location
    Lake of the Ozarks MO
    Posts
    3,583

    Default

    Quote Originally Posted by boardmanr View Post
    ok...i've was trained to use 100% argon or 75 argon and 25 helium to tig weld and mig weld aluminum but i seen on another site won't say who but they say to use 75 helium and 25 argon...which helium is a hotter burning gas.. and is light but my ? are they right is that the right mixture to mig and tig weld aluminum with?
    The need for different gas changes with what you are welding on with a particular machine. If you have enuff amps to weld a piece of 1/2" with straight argon well good for you, but if you can't get enuff heat then helium allows you to do this with a less capable machine. For example a 200 Dynasty is a fine tig welder but has a limit to what it will do and by using helium it can weld thicker metal than it would with straight argon and it will let you turn back the amps on less thick material to a setting where the duty cycle is higher.
    It can be confusing at first but after awhile it isn't all that big of a deal...just keep reading and asking questions.

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