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View Full Version : C02 mig on sheetmetal?



dpaqu
01-05-2016, 03:47 PM
Looking to do some patch panels on my old pickup. C25 costs a lot in my location so I'm looking at c02. wondering if c02 and .023 would be better than .030 flux core as far as burning holes and general warpage.

Thanks!

MinnesotaDave
01-05-2016, 03:54 PM
Yes it will be better.

C25 is very nice, but CO2 is pretty darn close.

Flux core for patch panels will not be fun.

B_C
01-05-2016, 06:28 PM
I think if you know what your doing as far as warpage control the CO 2 will be fine, I like the AR CO2 because it is easier on my clothes....

dpaqu
01-05-2016, 10:26 PM
By your clothes I'm guessing you mean spater? My research indicates that having an adjustable inductance setting will help with spater.

MinnesotaDave
01-05-2016, 11:47 PM
My research indicates that having an adjustable inductance setting will help with spater.

It does, my invertec 300 pro has that adjustment.

My millermatic 210 does not however and dialing the wire speed is enough adjustment for good results.

WNY_TomB
01-06-2016, 09:17 AM
Looking to do some patch panels on my old pickup. C25 costs a lot in my location so I'm looking at c02. wondering if c02 and .023 would be better than .030 flux core as far as burning holes and general warpage.

Thanks!
.
i have often used 2 cylinders one with pure argon and other with C02 or C02 mix and had both flowmeters go to Y valve to combine gases. that way i could get lower penetration with higher argon ratio or go back to pure C02 just by adjusting flowmeters.
.
if you already have the compressed gas cylinders and flow meters it is often as easy as getting some pipe fittings to setup using 2 to mix gasses. maybe not the most exact thing mixing gases but you can see results of different mix ratios in seconds.
.
many welders do similar thing with argon and helium when tig welding too.
.
you can always rent a small compressed gas cylinder if you want to try it first

xryan
01-06-2016, 11:09 AM
I use CO2 almost exclusively with my smaller machine as it's super portable and cheap. I rarely even use 75/25 anymore, I usually have an 88/12 for pulse or a straight argon tank on the big machine for aluminum.

Don't even bother with flux core, you will have MUCH better results with the straight CO2. Just limit your heat input, small stitches, move around, let it cool.

dpaqu
01-06-2016, 02:04 PM
It does, my invertec 300 pro has that adjustment.

My millermatic 210 does not however and dialing the wire speed is enough adjustment for good results.

That's good to know. The cheapest mig machine with adjustable inductance that I can find is the Tweco 141 for ~$600. If it's doable with either a cheaper or older non inverter unit than I'll save some funds. Just trying to weigh my options.

Broccoli1
01-06-2016, 04:32 PM
It will be a world of difference going from the Fluxcore to solid wire and CO2