- Thread starter blueprint
- Start date
Drains
Yeah, nah.
- Messages
- 7,718
- Location
- Sefton, South Island, NZ
Oddball's right, but you can happily weld galv if you a) wear a mask - air fed, preferably, or b) hold your breath.
An air-fed mask is industry standard. Nothing less would be seen as acceptable.
Galv fumes won't kill you (unless you pipe it into your mouth, virtually), but they will make you sick!!!! (google metal fume fever)
Forget the idea of MMA brazing rods. What size rods are you using now?
An air-fed mask is industry standard. Nothing less would be seen as acceptable.
Galv fumes won't kill you (unless you pipe it into your mouth, virtually), but they will make you sick!!!! (google metal fume fever)
Forget the idea of MMA brazing rods. What size rods are you using now?
matt1978
www.lorch.eu
- Messages
- 3,966
- Location
- UK, Cannock
Theres no reason why you can't conventionally MMA weld 3cm Glav mild steel, if your burning through, sounds like you've got the power too high.
Use a smaller rod, 2.5mm Dia and try running about 60-80 amps or so.
Grind off the galv from the area to be welded first tho because, apart from being bad for your health, the zinc will cause porosity and also can potentially make the weld brittle.
Use a smaller rod, 2.5mm Dia and try running about 60-80 amps or so.
Grind off the galv from the area to be welded first tho because, apart from being bad for your health, the zinc will cause porosity and also can potentially make the weld brittle.
matt1978
www.lorch.eu
- Messages
- 3,966
- Location
- UK, Cannock
Why? Would it make your day?
Sorry I didn't see it was chain link fencing, I envisaged normal galv fencing with them funny three pronged spikes at the top.....
Even so, if he only gotta weld 2 links, one at the start and one at the end, wouldn't he be able to put them in a vice and just take the bulk of it off where he wants to weld?
carbon copper rod
Is there another name for carbon copper rod and if so where can you buy them . Thanks
Is there another name for carbon copper rod and if so where can you buy them . Thanks
Why? Would it make your day?
Sorry I didn't see it was chain link fencing, I envisaged normal galv fencing with them funny three pronged spikes at the top.....
Even so, if he only gotta weld 2 links, one at the start and one at the end, wouldn't he be able to put them in a vice and just take the bulk of it off where he wants to weld?
nope im cuuting bits offf and making hanging baskets . Been whering basic mask and im ok so far
deltabravo
Member
- Messages
- 18
Hello, just go to your local welding supplier and ask him for a carbon brazing attachment, it looks a bit like a set of spot welding arms. There are two carbon electrodes that when attached to the welder makes an arc that you feed a flux coated brazing rod into whilst touching the part to be brazed with the electrodes at the same time. It is a dubious way of brazing and can be very wastefull of rods and electrodes at times. I have never had a very reliable joint using them and I have tried various types, better using a mig welder, hope this helps, Bob.
Paul.
Moderator
- Messages
- 7,052
- Location
- Northampton. UK
Ive actually got a carbon arc torch, its years old I didn't know you could still buy them, difficult to make a decent brazed joint because the arc is unshielded and you're fighting the oxidation, its a useful heat source though for straightening etc.
Also every one around you gets a suntan, and the carbon pencils don't last long
bill_gj
Tired and irritable
- Messages
- 1,423
- Location
- Essex, UK
I did quite a bit of brazing with my carbon ac attachment some years ago.
I always did it the old fashioned way, just as you would in a brazing hearth with town gas.
A decent clean-up of the parts, although I found that a little surface rust wan't a problem, fluxing both parts to be brazed with Siflux (powder you make up to a paste with water), then heating and brazing with a standard spelter rod.
I haven't tried with a modern flux-coated rod, but it may be that carbon-arc won't work too well that way.
Couldn't quickly find any www refs to good old Siflux, but this looks like a more recent equivalent:
http://www.thewelderswarehouse.com/Welding/Brazing_Flux.html
I always did it the old fashioned way, just as you would in a brazing hearth with town gas.
A decent clean-up of the parts, although I found that a little surface rust wan't a problem, fluxing both parts to be brazed with Siflux (powder you make up to a paste with water), then heating and brazing with a standard spelter rod.
I haven't tried with a modern flux-coated rod, but it may be that carbon-arc won't work too well that way.
Couldn't quickly find any www refs to good old Siflux, but this looks like a more recent equivalent:
http://www.thewelderswarehouse.com/Welding/Brazing_Flux.html
Seattle Smitty
Member
- Messages
- 15
I'm a new member, so hope you don't mind me arriving late to this discussion. I am looking for more info on carbon arc welding (I have a twin-carbon arc torch that I sometimes find to be a useful, even valuable tool), and sometimes volunteering what I've learned.
Here's something from a site that is largely printed in Cyrillic:
(quote) The carbon arc welding process has been widely used for welding galvanized steel. Both the single carbon torch and twin carbon torch can be used. The twin carbon torch is used as a source of heat much the same as the oxyacetylene flame; however, when the single carbon is used the carbon can be played on the filler rod and extremely high rates of speed can be accomplished. Normally in this situation the filler rod, Type RBCuZn-A (60% Cu-40% Zn). By directing the arc on the filler rod it melts and sufficient heat is produced in the base metal for fusion but not sufficient to destroy the zinc coating. This process and technique is widely used in the sheet metal duct work industry. (end quote)
Here's something from a site that is largely printed in Cyrillic:
(quote) The carbon arc welding process has been widely used for welding galvanized steel. Both the single carbon torch and twin carbon torch can be used. The twin carbon torch is used as a source of heat much the same as the oxyacetylene flame; however, when the single carbon is used the carbon can be played on the filler rod and extremely high rates of speed can be accomplished. Normally in this situation the filler rod, Type RBCuZn-A (60% Cu-40% Zn). By directing the arc on the filler rod it melts and sufficient heat is produced in the base metal for fusion but not sufficient to destroy the zinc coating. This process and technique is widely used in the sheet metal duct work industry. (end quote)
I think its affecting your spelling
You can get Copper based welding rods. They are not common and they are not cheap
Oh and they wont weld galved mild steel very well.
Use MS rutile rods, cheaper and easier.
For Brazing Galv Plate, or any other kind of Brazing, one way is with a "Twin Carbon Arc Torch" running from an AC MMA Arc Welding Transformer. You can use DC but the electrodes then burn at different rates which is awkward. It uses copper coated Carbon rods x2. You heat the metal with a flame which protrudes from the arc in a V shape. You apply the Brass Brazing rod to the metal, not the arc, and it will melt only when the metal is hot enough. You can use Flux Coated or Uncoated rods, with a separately applied flux dissolved in water, which I believe is mainly Borax and a colourant. I find this method to be Cheap, Easy, Easy to learn, Zero costs whilst not in Use, (unlike Bottled OA gas), and very adaptable eg to heating for bending etc.
What I want from this or any other Forum is a table of Lens Shades vs. Current (Amps), also typical metal thicknesses, carbon rod diameters, filler rod diameters, etc. etc. but Especially the first two. Surely this info can't have been Lost since the 1960's?!!. You find tables of this kind in every Arc welding book but never for this use. The UV and light output is probably greater than MMA because I believe the carbons (or carbon rods) were originally intended for Carbon Arc Lamps, eg Stage Lighting, Projectors, and the Carbon ends glow brilliant white on their own, over and above the arc itself. I'll certainly post some photos if anyone is interested. There is such a torch and some carbons currently for sale on ebay, quite cheaply.
What I want from this or any other Forum is a table of Lens Shades vs. Current (Amps), also typical metal thicknesses, carbon rod diameters, filler rod diameters, etc. etc. but Especially the first two. Surely this info can't have been Lost since the 1960's?!!. You find tables of this kind in every Arc welding book but never for this use. The UV and light output is probably greater than MMA because I believe the carbons (or carbon rods) were originally intended for Carbon Arc Lamps, eg Stage Lighting, Projectors, and the Carbon ends glow brilliant white on their own, over and above the arc itself. I'll certainly post some photos if anyone is interested. There is such a torch and some carbons currently for sale on ebay, quite cheaply.
brightspark
Member
- Messages
- 40,414
- Location
- yarm stockton on tees
this is an old post revived :
there was a fair few posts and replies to carbon ark torches and there use . i sold mine to a member cheap as i have no use for one and only bought it to have a go. realy o/a bottles cant be beaten for versatility and use but a carbon torch is the next best thing but cumbersome
