Tig Braze Skills

[jimjamosullivan]

I saw this and was mightily impressed. I wonder why i have not seen tig braze used for bicycle fabrication?

599867.jpg

599868.jpg

http://www.model-engineer.co.uk/foru...42&p=4#PostTop

james o sullivan
haiku bikes
london

[seankanary]

Are you sure that was done with a tig? There are quite a few cats that do that type of work with Oxy/Acet and an inline fluxer. Purdy nonetheless.

[Eric Siepmann]

Interesting. I would think you would have to have very good coordination and torch control. I can see myself dunking the tungsten or making a mess of the filler rod. I wonder if there is any more specific information about the process.

[Doug Fattic]

A few years ago I tried tig brazing with some kind of bronze filler rod fellow frame builder John Cherry gave me. I could lay a nearly perfect bead with it because of the precise location of heat the tungsten provided. I could get beautiful results and this way was a lot faster than doing a traditional fillet braze with Oxyacetylene or Oxypropane. The problem was with the filler rod. It did not provide a strong enough joint. I did not do more research on if there were more suitable bronze filler rods for tig brazing. If there are it would be a great alternative.

Doug Fattic
Niles, Michigan

[Will Neide]

SiBr?

[devlin]

Yes SiBr from what I've read. Apparently HAZ is less. I've only read a little about it.

I like the smoothing fillets from traditional fillet brazing. I'd just go normal TIG if I wanted the 'stack o' dimes' look.

[Jake Rosenfeld]

Looks like a silicon bronze cover pass to me.
I think it was popular with the chopper builders to pretty up some of the more visible welds on the frame.

Joint would be welded with er70 or whatever steel filler they are using and then run over again with the bronze for appearance.

In my experience, no it's not strong enough alone to create a good joint for a frame but it sure works good for art and appearance welding as well as being considered like the hot glue of the welding world as you can stick anything together with it.
I use it a lot to weld galvanized sheetmetal together for pans and trays and such.
The amount of zinc in it seems to work well for that application.

[edoz]

That's been hashed over multiple times on multiple e-places. It's O/A brazing. Torch, gasfluxer and wicked skillz.

[Luke Marinovich]

Here is a guy doing similar things with O/A....

https://instagram.com/kam_fab/

[steve garro]

That's been hashed over multiple times on multiple e-places. It's O/A brazing. Torch, gasfluxer and wicked skillz.

And running a little cold on thick material

- Garro.