Braized frame rather than welded, why?

[Ribenapigeon]

I was watching the Motorbike Show and Henry Cole had a frame built which was braized together. Why woiuld this be done surely welding is stronger and with modern welding equipment quicker and easier?

[sickpup]

Brazing, especially silver soldering can be performed at a lower temperature than welding and so heat treated tubing doesn't required re-heat treating.

[kramdra]

Probably a lack of equipement or cost? Perhaps as a one-off, braising is easier to change.

Welding temperatures can weaken and stress the metal around joints. A good braised joint will be stronger than the parent metal. Modern cars are made with higher strength steels that would be weakened at weld temperatures, so braised instead.

[Ribenapigeon]

Thanks that's interesting.

[davebike]

Braising was used before modern steels were available as it did not effect the them best steel options as it occurs at a lower temperature (800/900c) but it is no where near as strong as a well made weld (2500/3000c)

More modern welding methods and better steels make it mostly redundant

Modern braising is often TIg braising carried out using a braising rod and TIG welding gear
I am set up to do this but still looking for the job to try it out on
____________________
Dave
NC750Xdct + others at work !
davebike1@gmail.com

[sickpup]

[Islander]