got a set, in 20mm  , with a welder figure and a trolley with gas bottles for my wargames.

looking at a small scene with a fitter repairing some damage on an APC or MBT.

question is, what hoses do I need to model, nothing included in the set.

I'm guessing two, one from each gas bottle, but would they be single, or would they be joined to run together to the gun ?

any info appreciated.

You need a blue line for oxygen (the taller, slimmer black bottle) and a red one for acetylene (shorter, fatter maroon bottle. They aren't normally tied together but will naturally lay/ hang quite close together most of the time.
I should add a number of caveats:
I learned to weld in the 1970s and bought a Portapak in the '80s and that's how it was then.
I'm a lifelong civilian so I couldn't say if the Army does things differently.
The colours I state above are British practice, other countries may do it differently.
Model manufacturers have a tendency to model gas welders wearing a headshield. This is only correct for electric welding; goggles are the usual wear.
I'm not sure that a set of gas bottles would be much use on AFVs.
It's called a torch, not a gun, by the way.

Hope this helps,

Ali

Hope this helps

many thanks for that,
so should I consider oxy-acetelene as more of a 'cutting' equipment, and utilise the electric [ Mig ?] welding set for welding ?

this has a 'box' with a cylinder attached, so more a welder ie repair, than the oxy as a cutting equipment ?

I must admit,  , that my attempts, many years ago, at electric welding seemed to produce a convoy of snails across the join, which I then had to grind down, after knocking the worst of the 'clag' off with a hammer 

was going to 'copy image' - 'paste image' of the sets I got, but of course the forum does not allow that, so you need to 'save image' - 'add image' etc to finally end up with the pic.

It sounds like you have a MIG or possibly TIG set. I've never worked on anything consisting of tens of tons of very thick steel but a normal gas welding set-up such as found in a typical engineering workshop would just imperceptibly warm a tank then run out of gas long before it melted anything. I have cut steel a few inches thick with a "gas axe", but never tried anything thicker. I guess you would need to find somebody who served in REME to find out how it is really done.

looks like the electric set may be more TIG than MIG ir arc welding, best described as a box [the welder] with a tall gas cylinder attached.

Oxy/acetylene is used predominately for welding thin sheet steel, aluminium or brazing and silver soldering using the appropriate flux and filler wire fed by hand. When used for cutting propane can be used instead of acetylene as it is cheaper, it is in red cylinders, sometimes two bottles of oxygen are used when cutting thicker material and the cutting torch can be up to 3 feet long to keep the operator out of harm's way if the material is under a lot of stress.

Arc or stick welding uses either a mains powered transformer or a D.C. generator driven by a motor to produce the current for welding. The electrode is the filler rod approximately 12" long with a flux coating on it, this coating protects the weld against oxidisation until it cools.

MIG (Metal Inert Gas) welding uses an electric current to melt the filler wire which also acts as the electrode. The gas, usually an Argon mix is used to prevent oxidisation, and filler wire are fed up a cable to the torch and a trigger controls the flow of the gas and the feed of the filler wire off of a drum on the machine enabling long runs of weld to be made compared to arc welding and there is no slag from the flux to be removed.

TIG (Tungsten Inert Gas) welding works on the same principle as MIG except that the electrode is a Tungsten needle and the filler wire is fed into the joint by hand the same as gas welding. Argon gas is fed up through the cable along with the power for the electrode. It is usually used for welding aluminium, stainless steel and thin mild steel.

Geoff

@geoffc,
many thanks for all that info.

looks to me that I'll have a gas unit as cutting away some damaged part and the the electric welder repairing or add parts.

our rules allow repairs to light damage, and I thought it would be useful to have a small base with figures to denote the repair, sometimes it's too easy to forget something is damaged, but the fitters being working would make the situation clear.

again, thanks to all for all the info provided, my experience was with an arc welder, creating convoys of slugs, never did manage to get some welds like my mate 

My word, this Forum is certainly a learning experience. 

Only 1-1/4 inches thick, but here's where they cut two Sherman tanks in half and weld them together to make one good one (11:15 in).

now that is what I would call a 'CUT AND SHUT'