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welding and brazing
davy - 30/3/09 at 08:06 PM

I wish to do some brazing and I remember on this site someone was using propane and pub bottles. any one got any information how to go down this line..ie regulators etc. David

jacko - 30/3/09 at 08:11 PM

Never heard of that
oxy /acetylene yes

Mark Allanson - 30/3/09 at 09:15 PM

or even oxy propane, although sexy ahotalene is much better

davy - 30/3/09 at 10:25 PM

sorry chaps,reference the pub bottles I meant the co2 bottles that puts the fiz in the drinks

Peteff - 30/3/09 at 11:27 PM

You can braze with a Mapp gas blowlamp, the gas is available from B&Q. CO2 is no use at all for brazing only as shield gas for mig or filling fire extinguishers so pub gas is not going to help you.

splitrivet - 30/3/09 at 11:35 PM

Talking of brazing over the weekend I needed some brazing rods called into the local Halfrauds £3.99 for 2 rods!!!!!!! I made my excuses and beat a hasty retreat.
Cheers,
Bob

designer - 31/3/09 at 06:00 AM

Go to the local welding suppliers, such as Splatter in Bridgewater (who, I think, do mailorder). You get loads for £20.

paulf - 31/3/09 at 12:23 PM

I seem to recall that the small disposable type oxygen bottles for mini welding equipment contain nitros oxide. Ive been thinking of getting a co2 bottle filled with it to use for this purpose and a few other experiments.It is stored at the same pressure as co2 so co2 bottles can be used , it may not be a good idea to fill a co2 extinguisher with it though.
Paul.

David Jenkins - 31/3/09 at 12:29 PM

quote:
Originally posted by splitrivet
Talking of brazing over the weekend I needed some brazing rods called into the local Halfrauds £3.99 for 2 rods!!!!!!! I made my excuses and beat a hasty retreat.
Cheers,
Bob


Even BOC can beat that hands-down! Look in Yellow Pages for a local welding supplier (may well be BOC) and see what they have on offer. They will sell them in fair-sized packets though (e.g. 500g, or 1kg).

Note: ordinary brazing rods are made of copper, zinc and a few trace elements - and they have rocketed in price, so prepare for a shock...

Oh - and don't forget that you'll need a pot of the matching flux too, unless you're buying coated rods (more expensive than bare rods and a tin of flux, but maybe easier to use).

And I've just thought of a question - what are you planning to braze?

If it's not structural (i.e. just sticking some sheet metal together) then ordinary 'brass' brazing rods will be fine. If it is structural then you have to use 'bronze welding' rods - copper-tin alloy - which are a huge amount more expensive, and there's a skill to using them.
If you're talking about small stuff, then silver-solder would be easier - but that IS expensive (but excellent for fine detailed stuff).

[Edited on 31/3/09 by David Jenkins]

Simon - 31/3/09 at 11:51 PM

Copper has now come down in price so should have copper based products.

See http://www.lme.co.uk/copper_graphs.asp

ATB

Simon

[Edited on 31/3/09 by Simon]