Tried to ask google and get nowhere (get answers comparing argon mixes
etc but none answer the direct question.
I have a co2 bottle and can not afford any argon mixes as Australian gas
suppliers are extortionists re rental etc (it costs me over au$400.00
per annum for oxy acetylene without even using it) and the co2 I can
fill with dry ice much cheaper.
I have been using gasless mig up till now, but was wondering whether CO2
with plain wire or co2 with gasless wire was an option or any better and
was trying to find comparison.
as the situation calls for . CO2 burns a little cooler than flux core .
If I'm welding heavier stock or outdoors I usually go with flux ,
thinner sections I use gas . I tried C25 mix , with my 110 volt Lincoln
Weldpak 100 I felt it was only good for very thin stock .
I might try it, I was only going to if it is a big improvement but if it
is a much of a muchness I may only do it once as changing 5kg reels and
fiddling with bottles, regulators etc each time is
a nuisance if for not much improvement.
Gasless, also known as Fluxcore, is good for windy situations and when
you gotta haul the welder to the job and when the metal might be kinda
dirty. But it leaves flux residue behind. CO2 MIG welding spatters
more than C25 mix. A spool of 70S6 wire will also last longer than
fluxcore because it is pure metal. Fluxcore is more expensive per unit
length of weld. The spatter from CO2 MIG welding can be prevented from
sticking with anti-spatter spray. I know some folks who just use the
non-stick food spray but I never have. Don't bother using CO2 with any
type of gas. It is just a waste of gas. There is a type of welding
wire called Dual Shield that has a flux core and must be used with a
shielding gas. Dual Shield welding can lay down metal very fast but
needs a high amperage welder. A 140 amp welder is not powerful enough
to run it. Though I have run CO2 in my small MIG welder I don't
because mixed gas welds much nicer. Since you say you can fill your
tank your self with dry ice then buy a few kilos of dry ice and a 1/2
kilo spool of mild steel wire and give it a try. I assume you also
have a pressure regulator and a flow meter for the gas. And your
welder has a solenoid operated gas valve. As a last word I am
surprised you were unable to find any info online about using straight
CO2. You may want to look harder. Try this search term: "mig welding
co2 vs c25". I did and got lots of good answers. Like pictures and
videos showing the differences, advantages and disadvantages.
I gave you those comparisons and even addessed the use of CO2 with
fluxcore wire. Which you asked about. If you search MIG vs flux core
you will get many hits with lots of good information. I'm still
surprised you didn't find your desired info online.
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