Gasless WITH cheap CO2 gas for cooling?

[jb2000]

Has anyone tried CO2 for cooling with Gasless wire?

I have a suspicion it might provide some useful cooling of the weld pool to get slightly more penetration on the thinnest steel (0.7mm) without blow through. I can just see two panel edges in just a few places on the reverse, requires a quick grind and reweld the now thicker metal. It is an tiny fraction of a second between not quite continuous penetration, full penetration & blow through. Could be the trigger requires too much movement. This is with 0.76mm Innershield wire. A 1kg Sealey cylinder is cheap, should last >40min which is ages, £7-9 refill.

Then again two layers of 0.55mm copper work brilliantly, I just lack the right wide-throat clamps.

Not sure which is going to provide a better trick - the copper?

This is outside, driveway is raised, on a hill, right by a T-junction in line with the prevailing wind. So gas wire is out even with a shield, tried, no chance.

 

[keith19]

I'd go with the copper strip, personally. Not sure about using CO2 with flux-core, you need to know how it interacts with the flux and the weld heat before trying it on a job that delicate. It just might make the weld hotter... Good experiment to try on thin scrap, though.

 

[jb2000]

Copper it is, all the cheap cylinders appear to have gone anyway.

 

[TechnicAl]

gasless wire doesnt mean it generates its own gas shield. What happens is the weld metal can cope with the ingress of Oxygen and Nitrogen from the atmosphere and still produce a ductile porosity free weld. Interfere with that, by using a gas, and ypu create an imbalance which will produce a brittle weld that could be porous, exactly the opposite of what you may think.
Metallurgy / Chemistry / thermo dynamics works in mysterious ways

 

[jb2000]

Interesting.

Innershield does use a gas creating flux core from the specs. Clamping a thin strip of 0.55mm copper behind the difficult bits helped noticeably tonight.

I noticed the (infamous) 300ZX welder used Argoshield light outside, circa 18L/min flow rate as outside. I might give that a try someday.

 

[gavuk]

I noticed the (infamous) 300ZX welder used Argoshield light outside, circa 18L/min flow rate as outside. I might give that a try someday.

Done plenty of welding outside (barges and cars),some days spent more time setting up windbreaks and shelters than actually welding...ply wood makes a great windbreak .....even used the gazebo before ...never used flux core , and only ever used co2 at home ,managed so far

 

[TechnicAl]

Interesting.

Innershield does use a gas creating flux core from the specs. Clamping a thin strip of 0.55mm copper behind the difficult bits helped noticeably tonight.

I noticed the (infamous) 300ZX welder used Argoshield light outside, circa 18L/min flow rate as outside. I might give that a try someday.

Innershield doesnt create enough gas to completely shroud the arc. It also creates different gases at different temperatures (thermo dynamics) and none at all at the initial arc strike.
I didnt do any Innershield development but I worked with the man that did.

Using an additional gas wouldnt work. If you want to use a gas get a flux cored wire designed for use with a gas

 

[arceyered]

Innershield doesnt create enough gas to completely shroud the arc. It also creates different gases at different temperatures (thermo dynamics) and none at all at the initial arc strike.
I didnt do any Innershield development but I worked with the man that did.

Using an additional gas wouldnt work. If you want to use a gas get a flux cored wire designed for use with a gas

When I worked at Thompson chassis welding digger exstending boom arms ,
we used a dual shield "Weld proceedure work out by those who have to be obayed."

1.6 flux cord and a co2 mix sheilding gas ,the deposition rate was that fast that the weld was still red hot after the gas coverage had past.So the flux cord put a protective slag on top to stop post weld contamination.
Boy was it hot ,overalls turn white and plenty salt tablets