Anybody know about carbon arc brazing.

[dave h 2]

Still got my old carbon arc torch too, it ran all sizes of carbon that fitted the torch off an 90A Burgess Elto welder from the 60's. That said they were common back then and bought from welding suppliers so they always worked.

 

[RWD3M]

This topic came up a little while ago, here:

Carbon arc

So since I'm in lockdown with absolutely nothing to do I was wondering about learning more about carbon arc brazing . I've read various threads online about this technique but I didn't completely understand how it works This thread would be meant to put together some knowledge about prior...

www.mig-welding.co.uk

Don't know if it will help

 

[nickjaxe]

Something I was told years ago, was to also connect a return clamp to the work piece as well as the torch return, apparently it makes the arc more stable in relation to the work. I have no idea whether it works or not as it was a borrowed torch & I gave it back soon after.

Mmmmm interesting....I will give it a go....so ground the work to the welder return....I need to think about that....sounds like you would set up for gouging?

These thing will never give the results that you get brazing with a gas torch neatness wise....but they do work.

 

[minimutly]

Would love to see Jody from,hints and tips making a decent joint with these...

 

[The_Yellow_Ardvark]

I have one, came with the draper/Clarkson arc welder as part of the promotional package.

It gets used a bit, not as much as now I have gas set up.

All I did was run an extra lead from the vice the item was clamped in, or the clamp holding the work.

Switch on the welded set and close the rods until the arc was striking between the rods with a clear white light. Pull the carbon rods back until you got a gentle sound.

Applied the arc flame to the work and treat the flame from the rods as a gad torch.

Warm the brazing rod up and dip into flux and apply, moving the arc flame around the heat could be controlled and get the brazing rod to flow.

The heat controll does take a bit of time to get used to. The heat is controlled by the current set and the gap between the carbon rods.


The biggest repair was to a Moggy Minor bonnet lid were I brazed in a 7" square plate , due to rust.


They are great for brazing up cast iron seats, tools and stuff like that. But I am led to believe getting new carbon rods can be hard. Halford used to sell them.


Some one mentioned cats, yes it can happen.

 

[The_Yellow_Ardvark]

Additional to the above.

They are great for doing Lumi Weld alloy repairs as well.

 

[nickjaxe]

I have one, came with the draper/Clarkson arc welder as part of the promotional package.

It gets used a bit, not as much as now I have gas set up.

All I did was run an extra lead from the vice the item was clamped in, or the clamp holding the work.

Switch on the welded set and close the rods until the arc was striking between the rods with a clear white light. Pull the carbon rods back until you got a gentle sound.

Applied the arc flame to the work and treat the flame from the rods as a gad torch.

Warm the brazing rod up and dip into flux and apply, moving the arc flame around the heat could be controlled and get the brazing rod to flow.

The heat controll does take a bit of time to get used to. The heat is controlled by the current set and the gap between the carbon rods.


The biggest repair was to a Moggy Minor bonnet lid were I brazed in a 7" square plate , due to rust.


They are great for brazing up cast iron seats, tools and stuff like that. But I am led to believe getting new carbon rods can be hard. Halford used to sell them.


Some one mentioned cats, yes it can happen.

Rods are available on ebay....yes around 40 years ago I used to get my carbon rods from HalFrauds as well.

Cant see me using mine often.....maybe for heating more so.....costing nothing to hang on my workshop wall.