c25 or straight co2

[bigwelder]

just wanted to know what everyone thinks about using c25 verses using straight co2

[Wayne]

Gas

I use CO2. I have tried the mix but for my work the CO2 does a better job. I do a lot of repair work ( field and shop) and fab work with new steel. I have found the CO2 is a lot more forgiving when the part you are repairing is not perfectly clean and the penetration is better.
Wayne

[bigwelder]

i use straight co2 at work and i know we never clean anything before its welded and we have no penetration problems what so ever

[Mike W]

I have been using CO2 for 20 years. Since I also have an argon tank I am going to build a gas mixer just for the fun of it.

[weldmup]

Co2

just wanted to know what everyone thinks about using c25 verses using straight co2

CO2 is for mostly Spray arc on Thick Steel portions.Seventy five percent argon mixed with Co2 is primarily for thin gauge steel and can be easily used for short circuit transfer.mixes with over 80 percent argon are used for spray and short circuit transfer,but CO2 is the true spray transfer gas to use.

[bigwelder]

i have heard so much about different transfer methods but to me i just weld with .035 solid wire and straight co2 coming from a miller delta weld 300 set at 26 volts with the inductance control set at 23 wire speed around 75

[Wayne]

Gas

Weldmup.
What settings do you use to spray with CO2 and .035 wire?
Wayne

[hankj]

I used CO2 with the MM135 because it gave the biggest bang with the lower power. It worked just fine. Many folks report spatter problems with it; I had none.

When I got the 210 last month, I picked up 80CF of C-25, since I had the POWER! Welds real nice, but the difference is more noticeable welding thicker stock when the power is up (e.g. 3/8"). There is virtually no spatter, and the weld bead is very clean looking.

So, I guess what I'm saying is that there's a place for each - kinda up to the weldor!

Hank

[Bulldog]

I've only ever used C25. I'm paying close attention to this thread.
Bulldog

[Mike W]

I wonder where the c25 came from. Why not c50?

[bigwelder]

I wonder where the c25 came from. Why not c50?

im thinking it came from the fact of the 25% mix

[bigwelder]

i have used nothing but co2 and at times it does have alot of spatter but its due to weldor error not the gas

[Paul Seaman]

I'll stand on the other side of the fence. I prefer the c25 {75% argon-25%CO2} It has less spatter and cleaner arc charactoristics. Although it has less penetration it runs so much cleaner it is worth it to me. If I had a machine that I needed to max the penetration totally out yes I would grab for CO2. I have access to machines with much higher capacities than my mm210 so if can't do it I can get to a machine that can.

[hankj]

Weldmup,

Huh? Spray can only be accomplished in an argon-rich atmosphere?

Bigwelder,

I agree to a point, but as long as I stayed inside the parameters of the MM135, there was no spatter to speak of. If I treid to go where no man has gone before, BAD juju!

Hank

[BCarlucci]

hankj,

As far as i've ever been told you can only spray transfer correctly with a mix of 90%ar and any combo of Co2 after that, i.e 90/10,92/8, 95/5 etc. I've never heard of being able to spray with straight CO2, so i'm with you as to shruggin my shoulders.

BC