Best Gas for MIG Welding: CO2 vs. C25 MIG Mix

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A viewer asked us whether straight CO2 or an Argon blend was the best choice for MIG Welding. In this episode, we take a look at the differences between the two and Paul welds with both gasses for a side-by-side comparison.
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5 авг 2024

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Комментарии : 161

@jeffjohnson2792 4 года назад

Thanks for being quick and to the point. Can't stand the youtubers that just love to fill time with their blah blah. Subscribed.

@geraltofrivia7193 3 года назад

Agreed

@azlanyhasser5098 3 года назад

You right, bro...

@tomrado5249 2 года назад

lol same I subscribed on the 2nd video because he kept it to the point

@randomschittz9461 Год назад

What part of TN? I’m from Sparta.

@jeffjohnson2792 Год назад

@@randomschittz9461 Chattanooga.

@georgegucchi3680 2 года назад

Back in 1979 I was working at a welding shop. We had been using straight CO2. A salesman came in and gave us two bottles of Argon/CO2. We used it and loved it. But we had been using #9 welding lens which was dark enough for CO2. The arc brightness on the argon mix is much higher. We all had a bad night with burned out eyes from using the mix gas with too light of shade of lens. Argon arc 3:00 , CO2 arc 3:56 .

@donsmith9081 2 года назад

Use the darkest shade you can see thru. I use an 11 for gmaw

@norgermish1 5 лет назад

It depends on what you are welding, from my experience which is nothing like this guy, I am a machinist not a welder. If you are going to be working on sheet metal 14-20 gauge then the C25 will probably be the better way to go (if choosing to use gas and not flux core wire). Argon helps cool the weld and helps keep down spatter less heat less warpage less burn through etc. But it is just an opinion, he didn't seem to clarify what thickness metals he was going to be working with using those gases.

@chardon59803 8 лет назад

Thank you, exactly what I was wondering as I convert my flux core to gas for my hobby projects. Very informative.

@kickpublishing 8 лет назад

This was a great video - my instincts tell me this guy did not start welding last week.

@Welddotcom 8 лет назад

Dr. Ralph, You would be correct. Paul did training seminars for Lincoln Electric for over 30 years. Thanks for watching.

@mrt7512 2 года назад

As someone getting started with welding as a hobby I appreciate the straightforward explanation.

@dinkarjha4284 4 года назад

Very informative - concept is clear ... and specifically Mr Cody's reply i find it very logical and professional!!!

@chapiit08 8 лет назад

Great video, it helped me dispel my doubts regarding what to get for my hobby shop. Greetings from Argentina.

@jsabados 4 года назад

I have used flux core but want to change to solid core. This helped me decide what gas to get. Thank you.

@samarmas5082 2 года назад

Thank you sir for the quick explanation, you went straight to the point and it was easy to understand.

@timothym2241 2 года назад

I appreciate the economy of using straight C02. The fill is cheaper, and the bottle lasts way longer. I did however once suffer from a freeze up of a flow meter, which damaged its safety disc. So, I went back to a gauge and gauge style regulator, as opposed to a ball type flow meter.

@allenlarabie8854 4 года назад

Awesome video. Straight to the point. Simple explanation. 👍👍

@bobgreen3116 3 года назад

Thank you. Great demo. I always wanted to know what the difference was between the 2 gasses. Nice job. 👍👍

@tannorokrane3135 4 года назад

I love Pauls video's!!! What a great human!

@jnsfaith7030 4 года назад

I agree. I love this guy. Hes the best on youtube. I hope they are paying him good money. No bs

@regsparkes6507 3 года назад

That answered my questions. Thanks very much!

@thepitpatrol 3 года назад

I subscribed because this video was straight to the point.

@RickaramaTrama-lc1ys 4 года назад

That answered the question I had and thanks for doing so~!

@leeloxleigh1471 2 года назад

I started off using flux core then moved on to argon. But I found the best results when using Co2. I think that if you can, experiment and find what suits you. After all one size doesn't fit all.

@billthompson9595 5 лет назад

Thank you very much I am welding 1/2" PLATE TO 1/8"X1 1/2"X 18" SQ TUBING AND TRYING TO GET GOOD PENNITRATION INTO THE 1/2" PLATE WITHOUT BURN THROUGH ON THE 1/8" SQ TUBING I AM GOING TO GIVE THE CO2 A TRY AGAIN THANK YOU.

@stevelong2108 Год назад

Thank you for the info for us, the hobbyist!

@thatoldbob7956 6 лет назад

Isn't that the other way around? AUTOGAS it's called what I am using for years and as far as I know it's 25% argon and 75% CO2. I did a lot of auto-body work with it. Thanks for the video, very useful.

@freemarketjoe9869 3 года назад

questions answered. many thanks.

@PacificPinesRanch 2 года назад

Super helpful. Thank you!

@ircimager 9 лет назад

i've always been taught c25 cept for aluminum. straight c02 was never brought into consideration til today. think i'll stick with c25, though as i like the flatter bead profile

@edwardcruz5187 3 года назад

paul, ed here .. hey i just stated watching your videos, mig monday is what i started watching and would like to see 1. some verticle up welding on 1/4". 2. how to start dialing in the parameters for mig welding .035 using an argon mix ..

@scottwillis5434 4 года назад

Thanks for the informative video! Any chance of a slice and etch - or adding an existing slice and etch pic?

@joserios8312 3 года назад

thank very profesional and clear

@StupidEarthlings 5 лет назад

Was that (at 1:06) an actual cross section from the weld you did with the c02 ? Cuz the penetration profile looks great. :)

@bigneil8888 4 года назад

Very helpful, thank you

@MrKotBonifacy Год назад

From my own experience - argon stabilises the arc and makes it less aggressive, thus for welding thin sheets (like in body repair) Argomix is better. Two years back I helped my pal to repair the body of a second-hand van he purchased and planned to turn into RV of sort. I did most of the welding in my "personal" shop, with a rather simple MIG machine and straight CO2, using solid 0.8mm (0.03") wire - and it was OK. Not bad, not great - just "well, good enough, would do". Then we took the car to some other place to spray paint it (again done by myself; that place had nothing to do with painting cars, it was just bigger place I could use, and it has a way more powerful compressor than that little "farter" back in my shop). Anyway, while there I noticed some missed spot that had to be welded before painting, and I took that bigger MIG machine that was there, running 1.2 mm wire (0.05") and 90%Ar/10%CO2 gas. I was kinda hesitant to weld such thin sheets with this thick wire - I expected some serious burn-throughs and some "fighting" to get it done - but to my surprise it turned out to be WAY smoother than welding it with that thinner wire on straight CO2.No burned holes, just touch and go, full success at first try. Maybe the machine also contributed to it as it was a grade better than what I used before, but the gas surely makes the difference. Then comes the other end of the spectrum - if you have to weld some thicker stuff and your machine isn't really heavy duty one to crank amperage to 300 A on short circuit mode it's better to slow the wire a bit and use spray transfer method - but you can't really do spray transfer with straight CO2. so mixed gas is the must. But then as this guy in the video has said - for hobbyist/ home shop/ light stuff simple MIG on straight CO2 is just good enough, and the gas is way cheaper.

@saurabh9978 6 лет назад

Sir, you also comment on the weld profile, how does it affect the soundness of the weld with different wire?

@RCbasheracer 7 лет назад

are u using the same kind of wire for both ?

@JohnDoe-vq8bg 5 лет назад

Flux and stick because these GAS GIANTS ARE OUT OF CONTROL IN PRICES.

@mahindaherath2818 3 года назад

Thank you so much.

@goheat77 5 лет назад

great video

@hunterinthebush 3 года назад

Thank you!

@anthony9thompson 4 года назад

Thank you so much

@codyhereford2217 6 лет назад

Not only is 100% co2 cheaper you also get alot more Volume in the cylinder than argon or argon mix, due to co2 being a liquid in the high pressure cylinder.

@ionutth4895 5 лет назад

@TMoD7007 so c25 argon mix is the best choice for mig weld? And 100% argon for tig alu and stainless?

@ionutth4895 5 лет назад

@TMoD7007 ok in learning :)

@oceanhouse8080 4 года назад

6$ per 20 lbs of liquid that's cheap enough to run air tools...

@carolshawol6699 4 года назад

Co2 for short circuit is fine your right about spray but alot of dual shield fluxcores run best on straight Co2. C25 will make you lose ductility you should run straight co2 with gas fluxcore

@ascaniozamperla2839 4 года назад

@TMoD7007 you ever try tri-mix? It is the bees knees for stainless

@yvesedwingdamian9654 8 лет назад

hi. thanks for your videos. I have a question can I weld 16 gauge stainless steel whit 75% argon 25%(I don't remember the other). an if you can do a video whit your ahp200 tig welder .how to set the machine and how weld thin stainless steel whit that machine or whit mig thanks

@rolandocrisostomo2003 4 года назад

Great video thank you. But I would have to admit, I watch it on a Thursday.

@markharrisllb 4 года назад

I’m using 18% CO2 82% Argon, it seems to be easier to get in the hobbyist bottles in the OK. If I move up to the larger bottles they all seem to be tri gas.

@louderthanwords5929 8 лет назад

thank you very very very much.

@gregwest6032 7 лет назад

Dad gum Argon is so expensive here in Hi. You are looking at 500 bux here just to get a 125 bottle. Fixin to switch from flux core to Co2. Had to get my 5# beer Co2 bottle tested and filled and will just call it good.

@nicolec7290 3 года назад

Thank you

@seandrake7534 3 года назад

Will the cot run hotter on the same settings as 75/25 ?

@day71711 Год назад

I see a Everlast and amp welder on the table are those machines worth buying over a muller or Lincoln? Are the internals similar?

@adriansandor1733 5 лет назад

Thank you sir for your time, I also use argon-co2 mix only for mig welding steel, but I heard that the regulator is going to freeze when welding with 100% co2. Is it true? I didn’t try straight co2 yet but the advantage is that is much cheaper here in Romania. Thank you.

@leonardpearlman4017 4 года назад

Some CO2 regulators have electric heaters built in, or some kind of heat exchanger to pick up heat from the room. If you just use the same regulator as before it WILL turn into a snowball! There's a maximum amount you can withdraw from one CO2 cylinder. Ideally you would use a few tanks and a manifold, I use the heated regulator. Some MIG welders have an electric outlet built in to them, which is handy for this.

@charliejonescreations9018 7 лет назад

thanks,helpful

@mrmidnight32 4 года назад

That’s funny I have that same welder combo. AHP 201XD and a Everlast i-MiG 200

@donsmith9081 2 года назад

Another Sad Neverlast Spam.

@cornwasher 6 лет назад

Nicely done. What could help with this demo is giving wire speed, rate of gas pressure/flow rate, wire size and plate thickness....

@Billbobaker 4 года назад

How do you set up your mix with two tanks?

@koitorob 6 лет назад

In UK i've only ever used Argoshield 5. 95% CO2 and 5% argon. I was told that 100% CO2 burns the mig torch tip out.

@formeitwastuesday.1515 5 лет назад

The machines that didnt have inductance didnt weld nice beads with 100%c02 but the one that did didnt have a problem.

@thomasme9676 2 года назад

You started to say turn off a bottle. How are you mixing your gas? I was thinking of trying that. Thanks Tom

@asm7050 7 лет назад

tks

@7439norma 6 лет назад

I bought some0.023 wire for my eastwood 135 mig but on the wire it said 80/20 for the gas my gas bottle is 75/25 will this work with the 80/20 wire?

@reallygoodattention 5 лет назад

not a problem

@goodboyringo9716 2 года назад

At time 1:40 he said most people would pick C25 because it cost less but ... At time 4:49 he said he would do the straight co2 cause it was a less costly gas , so I'm confused ?

@steisje 7 лет назад

Hello. My regulator keeps freezing up when welding with co2... Any ideas?

@DrunkGoatt 7 лет назад

you could buy a heated regulator

@leonardpearlman4017 7 лет назад

There are heated ones that plug in, and heat-exchanger ones that have some copper tube or otherwise pick up room heat. The heat exchanger ones work fine here in FL where it's always hot. Might want the electric one in a cold climate? Bigger welders often have a 110v outlet built in that's good for this.

@alloutofdonuts3998 3 года назад

Which is better for thin wall 304 or 409 stainless tubing(exhaust)? C02? Seems like c02 might be less likely to burn thru? I know it should be tig and have gas going through the pipes but I’m not that fancy lol and it’s for my own personal use not commercial.

@donsmith9081 2 года назад

Tri-mix for SS it has helium also.

@AlexRodriguez-bb5bu 4 года назад

I've always wondered what gas would be best to use for my everlast mig welder.

@donsmith9081 2 года назад

Another sad Neverlast Spam.

@WV591 5 лет назад

nicely done. now we know.tu

@noride11 3 года назад

C25 = 75% Argon + 25% CO2. The image had it right though. As always, great video thank you for making these!

@theskrublords 7 лет назад

Can't you weld with pure argon tho? how's that like?

@leonardpearlman4017 4 года назад

It's sad! Not enough energy, and for steel apparently you want a slightly oxidising condition, as well as more arc energy so they say. Pure Argon is used for Aluminum MIG, and of course for all metals with TIG.

@ogreunderbridge5204 3 года назад

Nice video, but I miss the pure Argon comparison

@cesarmg4642 9 лет назад

Wich flow do you consider for either gas?? And about stainless steel, straight argon would be the best choice?? Thanks!!

@adriansandor1733 5 лет назад

No, you can’t mig weld stainless with pure argon, it doesnt make fusion and wet properly. I welded a stainless steel water tank and I struggle to get a decent job. It’s better to use c25 or c18 mix instead of pure argon, idealy would be 98 % argon and 2 % co2. Good luck!

@toycoma98 3 года назад

I had to use an adapter to connect regulator to a co2 tank. I have a 20lbs aluminum co2 tank with handle.

@djtoo7 3 года назад

Can u lay down the tanks or put them under your welding table and still use them?

@donsmith9081 2 года назад

yes just not acetalene.

@THX..1138 8 лет назад

Another important point hobby welders should know is blended gases have a self life. The gases separate over time and so are meant to be used within a short period after the bottle is filled, not months later. Chances are most hobby welders and even small body shops or mechanics who don't do a lot of welding are in fact welding with spoiled gas. They would likely be better off switching to straight CO2. It would save them money and produce more consistent results.

@mcamposc02 7 лет назад

THX 1138 sorry but thats is not thrue. CO2 and Argon are gas and a gas always fill all the space were is conteined. only the liquids can segregate when are inerts

@THX..1138 7 лет назад

Yes it true, it's called gas stratification. This quote is from Praxair. "Because of the difference in the specific gravity (weight) of the gases, stratification can occur with an argon/carbon dioxide cylinder filled by conventional methods. Carbon dioxide is heavier than argon and settles at the bottom of the cylinder. Inconsistent mixing in the cylinder is a common result."

@melgross 6 лет назад

I’ve had 8 years of chemistry, and 4 years of physics. The answer is that it’s not true. I don’t know where you saw that, but it’s incorrect, wherever you found it. If it were true, the earths atmosphere would have stratified billions of years ago, despite the wind currents around the planet. If we were talking about hydrogen and another very heavy gas, it’s theoretically possible that the hydrogen would end up on top. But in reality, it will never happen because of the small, restricted nature of containerization, and the Law of Entropy. Look it up. Also look up Boyle’s Law.

@DBLewisOrlando 6 лет назад

"Blending equipment can help solve another problem with pre-mixed blends: the stratification and separation of argon and CO2 inside the tank, explains David Bell of Concoa (Control Corp. of America, Virginia Beach, VA). "When CO2 and argon are mixed in a cylinder, the gases must be injected in the cylinder at different times, using some measured volume of each gas to produce the desired mix. CO2, which is in a liquid phase, is normally injected first and then the argon is injected, but this method doesn't allow for a uniform blending of the gases in the cylinder, causing stratification." Stratification can also happen if the mixture isn't used for an extended period, he adds. "This occurs since the CO2 at high pressure in the mixed gas cylinder will continually attempt to return to the liquid phase and settle to the bottom of the cylinder." weldtalk.hobartwelders.com/forum/weld-talk-topic-archive/welding-processes/9307-argon-mig-mild-steel

@mikemudimba5531 5 лет назад

This is priceless information for me right now. Thank you so much

@Sam-lk6eo 2 года назад

Hi Paul, I'm a little bit confused ? At the start you said most People tend to go for C25 mix, As it is a cheaper option, But near the end You chose 100% Co2 because its cheaper to buy ?

@leonardpearlman4017 2 года назад

I think that first mention was a mistake! CO2 is clearly cheaper. Also easy to obtain, and there's a lot in a tank.

@Journey4SureKnowledge-N-Wisdom 8 лет назад

Thanks for the video :o) I've been mig welding for over 20 years and got pretty good at it for being self-taught, but haven't done much welding on stainless steel to have the in's n out's of it and so needed to know if straight CO2 be good enough to weld 1/16" - 1/8" stainless steel that is 304 and 409 grade? I'm not needing perfectly looking welds... just a weld that is decent-nice looking.

@leonardpearlman4017 7 лет назад

I've tried "dual-shield" type stainless. That's gas-shielded flux-core stainless. Normally pretty expensive, I got it surplus. Worked great. Intense powerful arc, black slag and under that a gleaming smooth stainless bead! This with CO2. I think stainless solid wire and CO2 would be too oxidizing for stainless. The traditional gas for this might be something like Argon-Oxygen 1%, and you'd still want to think about what's happening on the back of the weld!

@actorzone856 5 лет назад

I have been using fire extinguishers for my CO2, and yes i turn the cylinders upside down because there is a stem in the cylinder, i have found i am getting stunning welds on clean shiny steel and good acceptable and rugged welds on not shiny clean old well used steel, the welds are far better than using the best gasless wire on the market, i don't buy the cheap gasless wires as they do crap welds which i have proven that with my experience and i have noticed bugger all splatter with straight CO2.

@gabrielcarrizo4880 4 года назад

So what do you do with the heating problem, I'm about to get a mig machine and I'm worried about it

@oldaccount9190 5 лет назад

CO2 is commonly used in my country argon is mostly for stainless steel by 90% for minimal wage

@rubenvargas3547 2 года назад

Walt is the man 👍

@ronsbeerreviewstools4361 6 лет назад

Thanks for posting this informative video. Ill pick CO2, because of cost, why not. But Is there now a mig wire where you dont need gas.?

@ramonvasquez8312 6 лет назад

flux core no gas more clean up though

@ronsbeerreviewstools4361 6 лет назад

Thanks for the information, Ill take the cleanup- versus those gas tanks & regulator.

@hgj2019 3 года назад

From my experience the FCAW is not a good choice for light gage sheet metal, like auto body work. Since you have to weld scattered spots to prevent metal warping from excess heat you run a great risk of slag inclusions at each start/stop. MIG would clearly be a better choice. Any residual flux or flux smoke (there is usually a good bit) can cause paint problems if not COMPLETELY cleaned from the metal.

@rmcmunoz2 6 лет назад

So for the most part , c-25 is cheaper then straight co2 ?

@ohiomapleguy 3 года назад

no, c100 is cheaper. Maybe he misspoke when he said that or its just an old video, but C25 is about 4x as expensive to run than C100. at least nowadays since this is a 3yr old question. this link goes in depth. welditu.com/welding/tips-mig/mig-welding-with-100-co2/

@leonardpearlman4017 2 года назад

No! That was a mistake. It happens!

@baronvonchickenpants6564 4 года назад

I think Co2 is better for car panels also if you blow a hole it's easier to fill , am I wrong???

@reubenvargas2824 8 лет назад

Where do you buy those welding shirts at

@ThatWeldingGuy 8 лет назад

Any local welding supply would have them. You can also get them on Amazon.

@nickrockz97 7 лет назад

reuben vargas i got mine at northern tool

@SnakePliscan 7 лет назад

Personally the puddle control and the far superior finished weld appearance make the marginally more expensive C20 or C25 well worth the expense. I think the inverter based Migs may have a small advantage over the transformer based machines on strait Co2 but if you want to lay down awesome spray transfer like welds (C20 territory) that ain't happening on Co2.

@Fringeless 7 лет назад

Well, not to mention that you get alot more weld time with straight co2

@domjohnson2579 2 года назад

How much cheaper is C100 vs C25?

@bobbydeol8860 5 лет назад

Our company is using 98% Argon & 2% oxygen(O2), on sheet of 1.2 mm stainless steel. Can u please explain me the purpose of 2% oxygen?

@ironken1796 5 лет назад

O2 helps stabilize the arc and seems to help wetting. I have only used Ar/O2 mixes in spray. I have never tried using Ar/O2 mixes in short circuit....I don't know if that is even recommended.

@robsolo127 3 года назад

Thoughts on argon helium?

@tarakai2 2 года назад

Works very well when TIGGING aluminium as it produces a hotter weld. It's very good for when you only have a single phase (240V) machine and you are trying to weld 6mm alloy plate.

@keane8213 5 лет назад

When they say it's 75% argon and 25% co2, what do they mean? Is that what's in the bottle already or do you set it to that...? Confused

@stevenmurata4392 5 лет назад

Already mixed in bottle.

@goatsinker347 2 года назад

Should've included straight Argon too.

@michaeldvorak5556 2 года назад

He did this in an earlier video. 100% argon is not acceptable.

@kaieteurcanada 4 года назад

Did you say that c25 is less expensive than co2 at 1.40 +>

@mdavis4930 4 года назад

Kaieteur Canada I think he did at first

@kwd57 9 лет назад

At 1 mjn 40 sec you say c25 is cheaper, but then at other parts, you say Co2 is cheaper.

@ratdude747 9 лет назад

+kwd57 probably mispoke.. Caption to "fix" this?

@dahveed284 8 лет назад

+kwd57 I noticed that too.

@Welddotcom 8 лет назад

+kwd57 100% Co2 is the cheapest. We have put a caption into the video to correct the confusion.

@ke6bnl 6 лет назад

co2 is in liquid form in the bottle so there is much more for the same size bottle

@aggiejet 3 года назад

As of today, 1-5-2021 there is no caption that I could see clearing up the confusion about which is cheaper.

@markbroad119 2 года назад

trimix Argon Helium Co2

@marcussatterwhite 4 года назад

👌

@massimo79mmm 4 года назад

in europe we use, in the 90% of time, 87-13 or 82-18 even in thick plates, because the puddle is warmer, and it bring to less fragile and more tensile strenght welds. with 100% co2 you have more penetration, but high heat input and carbon in the puddle. you can see the difference between high and low heat input in lab test. watch this ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE--W1E0bxjcEc.html another thing: co2 at high temperature (source: italian institute of welding) produces co, that often remain trapped in the puddle.

@randomschittz9461 Год назад

Round here it costs $80 to fill a C25 bottle. It costs $32 to fill the Co2. Imma use that Co2.

@Banshee350speed 2 года назад

Where I live, c25 is 3x more expensive than 100% co2

@dado4352 3 года назад

Huw much does that everlast cost? Because, I have a Chinese welder, looks 100% like Everlast. Paid 95 bucks for him. I did some research and found several exact machines with different names.....Weldinger, Proinstall( in Europe). Hope you didnt paid much, because that is repainted Chinese junk, but it works fine actually

@leonardpearlman4017 2 года назад

At 1:45 speaking of the cost difference, I think CO2 is obviously cheaper, and people choose it for that reason, so it came out backward here. Other than that, a good and important video!

@jinh442 7 лет назад

what is the difference between CO2 and MIG welding? equiptment wise. kinna confusing. @@?

@Welddotcom 7 лет назад

CO2 is a gas that can be used as a shielding gas for the MIG welding process. CO2 is not a process. Hope that answers your question.

@williamgarrity9482 2 года назад

What are the chances that c 25 was still in the gun when u started using co2 ?

@debbant Год назад

In the beginning he said C25 is cheaper than CO2. Then at the end he said he would CO2 because it is cheaper. WTF

@MarkoVukovic0 25 дней назад

Yeah, I'm a year late but CO2 definitely is cheaper and more readily available. One can even get an adapter and use a SodaStream or paintball CO2 cylinder.