[JayWal]

Does anyone know any good article about the differences/pros/cons between C25 gas and other blends like 92/8, 90/10 etc. I’m considering switching one of my welders to something that’ll let me spray and pulse spray better. But I can’t really find any good info about the pros and or cons/limitations of the different blends.

Thanks for any info


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[tweake]

this is my usual chart/book
https://www.boc-gas.co.nz/en/images/NZ_ ... 171116.pdf

i have seen some sites around with good info but i can't recall where.

[LtBadd]

Take a look at THIS Lincoln Electric article.

In the 4th paragraph...
"However, detailed information on shielding gases can be found in Lincoln Electric’s "GMAW Welding Guide" (booklet C4.200) on pages 12 – 15. It is available at no charge:" download link follows in the article

Hobart has a lot of info on their site, take a look there as well

Hope this helps

[Oscar]

Assuming youre only talking about welding mild steel, higher argon concentrations will have less spatter on short circuit, but also less heat input into the part, so less penetration. That's why we generally don't use CO2 concentrations less than 8-10%. You can always go with 85-15 as a good compromise for both short-circuit and spray/pulsed spray, just increase the voltage a smidge.

[JayWal]

Take a look at THIS Lincoln Electric article.

In the 4th paragraph...
"However, detailed information on shielding gases can be found in Lincoln Electric’s "GMAW Welding Guide" (booklet C4.200) on pages 12 – 15. It is available at no charge:" download link follows in the article

Hobart has a lot of info on their site, take a look there as well

Hope this helps

That PDF download is gold for an info nerd like me, thanks!! Even printed it out to study it more lol

One thing that surprised me, it states adding helium REDUCES penetration. I’ve often heard that helium helps penetration on Aluminum with TIG but the article specifically states it’ll broaden your penetration, but not deepen it but will get rid of that deep finger of penetration you get with pure argon. However this is a GMAW article, maybe it’s different with TIG?

Anyways, definetly a good read.


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[tweake]

Assuming youre only talking about welding mild steel, higher argon concentrations will have less spatter on short circuit, but also less heat input into the part, so less penetration. That's why we generally don't use CO2 concentrations less than 8-10%. You can always go with 85-15 as a good compromise for both short-circuit and spray/pulsed spray, just increase the voltage a smidge.

unless you use a tri-mix that has o2 in it, which has the effect of having higher amounts of co2. eg my usual is 86 argon, 12 co2, 2 o2.

[weldin mike 27]

We use tri mix ar, co2, o2 with a 500 amp mig and 1.2mm s4 wire. Man you could get it spraying like a beast. No spatter to be seen anywhere.

[Mike Westbrook]

I keep two blends 85/15 welds very clean short circuit and spray it's a nice Ballance for clean welds almost no spatter and also 95/4/1 for stainless it's supposed to be colder but I've sprayed it nearly spotless almost paint ready welds I've used high co2 blends but they tend to make a weld closer to a cellulose rod dirty and a little violent I imagine a good sized mig machine and 85/15 will get you there for a decent price on refills another note it seems to me the less co2 the faster you use it up maybe it's my wallet or is the co2 denser ?? Flows slower covers better not sure

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[snoeproe]

I love 100% co2 for duel shield flux core wire (71T wire).
For solid wire mig I prefer 75/25.
The only reason that I would want to run higher concentrations of argon is to get into spray mode. 90/10 is nice for metal cor wire spray mode. To achieve true spray transfer you need a minimum of 80% argon.