mig welding with CO2?

[sharky8js]

I went to my local welding supply to buy a tank of argon 75% CO2 25% gas.
The guy told me to save my money and just buy the 100% CO2, it will last 5-7x longer than the argon/co2 mix.
What??? I've never heard of that!!
I'm only planning on using my millermatic 135 for some small project and body work.
Is this guy a nut??
Whats your opinion??

[monte55]

He is correct. The co2 is a liquid that boils off and gives you the protective gas and deeper penetration you may need with a small welder. The 75/25 will give you a weld with less splatter and nicer if you have the power.

[Broccoli1]

I went to my local welding supply to buy a tank of argon 75% CO2 25% gas.
The guy told me to save my money and just buy the 100% CO2, it will last 5-7x longer than the argon/co2 mix.
What??? I've never heard of that!!
I'm only planning on using my millermatic 135 for some small project and body work.
Is this guy a nut??
Whats your opinion??

He is sort of correct- it only lasts longer because you get more for less $

Flow rate is Flow rate:

20# CO2 tank equates to about 174CF of Gas/ by yer flow rate and that is how long it lasts.


CO2 is usually cheaper and a 20# tank is a blt easier to transport BUT some people don't like the way it welds- produces more spatter. I used it on my SP135 and seemed just fine for me but I wasn't doing body work- but I did do a fair amount of sheet metal work.

[aametalmaster]

I use both in my shop and like the 75/25 better for most work. But when i weld outside its all co2 since most of it is blowing away anyways...Bob

[sharky8js]

Well then I guess I'll give it a try,
I just wanted some opinions before I spent the money - since I need to buy a bottle.
Other than splater, is there any reason not to use co2?

[aametalmaster]

Other than splater, is there any reason not to use co2?

Nope..Bob

[Broccoli1]

You'll need the CGA adapter for your Regulator and don't forget to pick up a teflon washer also.

http://weldingdirect.com/a8arregtoco2.html

[FusionKing]

Some of the older Millers were designed to run on it. Like the MM200 for instance.
If you can control your inductance, you can set your machine to run sweeter when using it. Many higher end mig machines have inductance control.

[sharky8js]

So are you saying my current regulator will not work with CO2?
I have a Harris - off a 1989 L-tec or it came off a 2002? Miller 220.
My welder is a Millermatic 135 110v.

[nfinch86]

So are you saying my current regulator will not work with CO2?
I have a Harris - off a 1989 L-tec or it came off a 2002? Miller 220.
My welder is a Millermatic 135 110v.

Yes, It will !!!
You need the Adapter Ed, was refering to in the above post.

............Norm

[big mike]

Western Ent part # 806

[crawler]

Some of the older Millers were designed to run on it. Like the MM200 for instance.
If you can control your inductance, you can set your machine to run sweeter when using it. Many higher end mig machines have inductance control.

Millermatic Passport is designed to use CO2. It works very well with CO2.

[Danny]

For thin auto sheet metal C25 would be the better choice over CO².

[FusionKing]

Millermatic Passport is designed to use CO2. It works very well with CO2.

You are correct of course.
I thought about that after I hit submit and was too lazy to go back and edit... We have the forum for that