[python] Re: advice on buying a brazing torch
- From: George Durbridge <gdurbrid@xxxxxxxxxxxxxx>
- To: python@xxxxxxxxxxxxx
- Date: Sat, 06 Feb 2010 08:18:12 +1100
Home made twin carbon arc welding attachment described here.
http://www.instructables.com/id/Make_a_carbon_arc_torch_for_your_220_volt_stick_we/
and more information on arcs here
http://members.misty.com/don/carbarc.html
Twin carbon arc cutting and welding seem to be still in use. If you
Google for "carbon electrode arc welder" you may find a local supplier
of the electrodes. I couldn't find any mention of adapter kits for
welding, but perhaps you could use the electrode holders sold for carbon
air cutting. You would need to wear a welding helmet and take the usual
precautions against UV burns.
Gerald, when you refer to WIG welding, I assume you mean what some of us
call TIG (Wolfram/Tungsten Inert Gas)? If so, I agree entirely: it is a
very controllable, effective process and the only gas used is argon,
which is as safe as bottled gas could be. The smallest units, which are
probably all you need for thin tube, will run from 10A power sources.
On Fri, 2010-02-05 at 21:06 +0100, bepb wrote:
> Hi Marek,
> in my experience the the small Propan/Oxygen sets available in home
> stores may be cheap to buy but very expensive to operate because the gas
> is extremly expensive compared to the "standard" containers for standard
> acythlene/Oxygen torches. If your Project goes anyway like my Python,
> you will have to braze a lot more than you expect now.
> None the less, before making a decission you should consider the
> potentional the hazards of storing 10 l /10 l Acythlene/Oxygene in close
> quarters, specialy cellars.
> If you go for a acythlene/Oxygene torch, maybe you also can save using
> sliver brazing rods and go for cheaper material.
>
> The cheapest way of brazing steel tubes I can think of is using a TCAW
> torch.
> It comrises of a handle with to carbon elektrodes connected to a simple
> AC stick welding equipment. The arc burns between the carbon elektrodes
> and, while the thing is a bit crude, it can be used like a
> acythylene/oxygene torch. I brazed a luggage rack for a Motorbike some
> 20 years ago and it worked out well.
> It had cost some 15 DM at the time and worked with the cheapest of AC
> Stick welding equipment. It also allowed to use brass brazing rods
> instead of sliver rods.
> Havend seen this kind of device for some time - maybe it is not used any
> more, check out savety instructions. (The thing produce extreme UV-Radiaton)
> (So much for the cheap version)
>
> While all this is feasible, I myself went ahead and got myself a Wig
> Welding Equipment. Makes clean welds, and avoids the potential hazards
> of having to store acythylene / Oxygen. I even used it for brazing - but
> only because the item has been brazed before. The drawback, I have to
> admit is the price.
>
> I never used a flux Core Mig - but I would suggest to check out the
> welding forums or mailing lists, if I remember correctly, flux core not
> suitable for thin tubes.
>
> Maybe it will help you.
>
> Best regards
> Gerald
>
> bnmm@xxxxxxx wrote:
> > Listies,
> >
> >
> >> Kevin Bailey wrote:
> >> It looks like there's no oxygen supply and I'm not aware of
> >> any gas that gets terribly hot without an oxygen supply.
> > Yes, I had a hunch in that direction, but hoped there was a way out.
> > I'll have to buy a acetylene/oxygene welding torch for silver
> > soldering as Dan suggested.
> >
> >
> >> Are you opposed to using a MIG welder with flux core? Very cheap,
> >> easy to learn, easy to use and fast.
> > Yes Chris, for two reasons:
> >
> > 1. I'd prefer to use a welding torch so I can undo/alter/reuse things
> > more easily. Though I'd like to built some sort of (say,
> > pythonesque...) recumbent for my everyday use eventually, I'm into
> > experimenting mostly, so building a new construction for every new
> > idea will be costly and time consuming. With welded stuff I'd need to
> > cut it into pieces for reuse.
> >
> > 2. I once worked with a MIG welder (no flux core) and had a hard time
> > to weld reclaimed bike tubes (cheap, light weight, and I like the
> > optics). Those are mostly thinner that square tubes (~2-2.5 mm, isn't
> > it?) many use for pythons. Is it just me? I had only some days'
> > practice. Is bike tube handling by MIG feasible with more practice?
> >
> >> John Lewis I now tend to use a small DC arc welder and find this,
> >> with practice, does a good job.
> > For silver soldering? MIG-Brazing Machines as they sell at
> > http://lorch.biz/index.php?id=291&L=1 start with around 1500.- EUR.
> > ...I'm to cheapskate for that, besides, a tech rep for the company
> > told me that undoing/altering connections afterwards is not feasible
> > with these machines.
> >
> > Sorry for being a crank about this, but my neighbours will be a bit
> > nervous when they see me working with those large grey and blue gas
> > bottles in the basement (and I'm to tight to use the small ones that
> > are finished in half an hour), so I'd prefer either a propane bottle
> > or something electrical, but seemingly I'm better off renting a shop
> > elsewhere so I can torch away at will. Who wants neighbours around
> > anyway? ...just joking.
> >
> >
> > Cheers,
> > Marek
> >
> >
> > Marek Möhling
> > Naunynstr. 82
> > 10997 Berlin
> > Germany
> > Tel: +49 30 347 676 95
> > Fax: +49 30 484 988 218
> >
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