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Tig Gasses

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Tig Gasses

Postby DrDogwood » Mon Mar 20, 2017 12:18 am

Hello
Well New to these forum things so let me give this a try.
Jody Talks about adding Helium when tig welding to Make a smaller machine act a little bigger. My question is this. I have Tri-Gas (90%Helium 7.5%Argon 2.5% CO2) can I add this to my Argon threw a Y In my supply line or will the Co2 give me problems. I will be honest most of my welding over the years has been mig and stick with very little Tig I can usually get things done with the Tig but I am by no means an Aerospace Tig welder.Well any help/Advice will be appreciated
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Re: Tig Gasses

Postby weldin mike 27 » Mon Mar 20, 2017 6:51 am

Hello Doc.

There is a lot to be gained in mixing gasses for tig, but only very specific ones. Argon is usually the main one with little bits of helium added sometimes. However, if you are just doing hobby stuff, don't confuse yourself. Pure argon, thats the way to go.

On your exact question, That gas is for MIg, which is why it has the C02, to give punch to the arc. For this reason, you cannot use it for tig because the tungsten needs to be in an inert atmosphere, otherwise it will just disintegrate. (ask me how i know)
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Re: Tig Gasses

Postby Olivero » Mon Mar 20, 2017 1:50 pm

Yeah,

TIG needs an inert shielding gas. Argon is the main one and can be mixed in whatever ratio with helium to increase heat output, its mainly done for thicker aluminum I believe.

I use 100% argon for everything I do, never experimented with helium and Argon is all we use at work.
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Re: Tig Gasses

Postby Farmwelding » Mon Mar 20, 2017 1:59 pm

Yep. Just use argon for now. If you start doing a lot of aluminum jobs with 1/2" thickness and up, depending on the amperage range of your machine, then you may consider helium. Helium will take your 200 amp machine and let it do 3/4" aluminum, just barely. Now if you have a dynasty 400 or 700, then this isn't an issue, but for most of us we don't have these and if we are losing jobs because we can't weld inch thick aluminum then helium is maybe something you want, but argon is far more versatile. Yeah and any CO2 in your tig gas does fun things. Just like welding galvanized without removing the coating and then tiggin it. It is all sorts of fun.
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Re: Tig Gasses

Postby LtBadd » Mon Mar 20, 2017 2:43 pm

As others have stated argon is all you really need, however in a production environment, welding stainless, the addition of 2-5% hydrogen can be used to provide more energy to the arc and the stainless will wet out a little better. Most shops do not use this but it is an option that is available.
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Re: Tig Gasses

Postby Farmwelding » Mon Mar 20, 2017 3:42 pm

LtBadd wrote:As others have stated argon is all you really need, however in a production environment, welding stainless, the addition of 2-5% hydrogen can be used to provide more energy to the arc and the stainless will wet out a little better. Most shops do not use this but it is an option that is available.

I am curious, hydrogen is explosive, electricity and heat plus gas that is explosive? How does this work? How is there explosion or fire?
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Re: Tig Gasses

Postby LtBadd » Mon Mar 20, 2017 4:09 pm

Farmwelding wrote:
LtBadd wrote:As others have stated argon is all you really need, however in a production environment, welding stainless, the addition of 2-5% hydrogen can be used to provide more energy to the arc and the stainless will wet out a little better. Most shops do not use this but it is an option that is available.

I am curious, hydrogen is explosive, electricity and heat plus gas that is explosive? How does this work? How is there explosion or fire?

It's such a small % and mixed with the (inert) argon it's not an issue. For manual welding they don't mix it above 5%, just found this have a look, higher % are for mechanized applications
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Re: Tig Gasses

Postby exnailpounder » Mon Mar 20, 2017 4:17 pm

Stoichiometry. Any flammable has to have a certain amount of oxygen to be explosive. The hydrogen is dissolved in inert gas so it never gets any O2 to make it go boom.
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Re: Tig Gasses

Postby exnailpounder » Mon Mar 20, 2017 4:17 pm

Richard stole my thunder :lol:
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Re: Tig Gasses

Postby Farmwelding » Mon Mar 20, 2017 5:08 pm

So I wonder what kind of fun it would be with pure hydrogen or half hydrogen and half oxygen. That would be cool for a bout two seconds until your face burned off. Seems interesting! Don't anyone try it.
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