What is the difference between using CO2/Argon mix, and using just Co2 or Argon when welding?

Mig (metal inert gas) welding with Co2 is known as mag (metal active gas) welding. Pure argon is for aluminum and stainless. Plain old Co2 is cheap and usable but not recommended (some steels). Argon Co2 mix is the best. I would use a 75%argon 25% Co2 mix. Plain Co2 adds some carbon to the joint (not good for some metals). Flux core only (gas-less mig) is junk unless you don't care about your welds, it is full of porosity and slag.

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RE:

What is the difference between using CO2/Argon mix, and using just Co2 or Argon when welding?

I'm about to get a small MIG welder that is capable of using CO2, Argon, or a mix as a shielding gas. I can also use flux core, but I already know that flux just makes a mess.

What I want to know is what is the difference between using either Co2 or Argon by them selves, or using a mixture...

Mig (metal inert gas) welding with Co2 is known as mag (metal active gas) welding. Pure argon is for aluminum and stainless. Plain old Co2 is cheap and usable but not recommended (some steels). Argon Co2 mix is the best. I would use a 75%argon 25% Co2 mix. Plain Co2 adds some carbon to the joint (not good for some metals). Flux core only (gas-less mig) is junk unless you don't care about your welds, it is full of porosity and slag.

Hes right on this one

Argon Co2

Argon gas is used to stabilize and control the arc when welding with Tugsten Inert Gas(T.I.G.) welding but does not supply enough penetration when using a process with much less Control of the arc like, M.I.G. Pretty much any CO2/argon mix(75%,25%,...) will work great with any most materials. If you try your hand at Stainless or Aluminum i would Research it first.

Flux-Core welding is one of the best and widely used welding processes. It is easy and convenient, it is very useful with thick material and welds that need to withstand a big strain. If you are able to set your V/A properly the Flux will actually lift itself off the weld before your done, making it very clean and smooth finish.

Also porosity is NOT normal EVER. If you start to get porosity in any of your welds check the following:

Where is the gas?- is there wind pushing it away? is the tank empty?

Is the Weld area clean? Is there water, oil, dust, sand that is causing impurities to get into the weld pool?

Good Luck

Always have a fire extinguisher on hand while welding!!

I used Mig with Argon welding since 5 years ago to welded metal sheets it was OK, but now my Mig welding machine not working anymore, and the technician guy recommends that stop to use Argon use Co2 instead it will be better.

But i still not understand that i used 5 years ago without any problem just now happens?

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For mig welding you should use the mix (75/25). you can use co2 for mild steel but be aware if you need a sound weld the carbon in the co2 will add carbon to your weld. It could cause problems down the road. I would look around for a supplier that sells the mix gas. At worst you could use flux core and no gas but it will not be pretty.

you can use CO2 for steel- the weld will be just as strong, but not as clean. Straight Argon is for welding Aluminum, and doesnt work well for steel.

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