Brazing w/ out lugs?
I need some tips about brazing with out lugs. Should I tack weld first?
I watched a welder do a bike, and he had a good step procedure to keep it from warping. see the red numbers:
And what is the name of the brazing material that is almost as strong as steel?
http://nhojyesdnil.files.wordpress.c...e-plan-999.jpg too bad I can not up load this picture!
Fillet brazing is traditional, laying down a big smooth fillet that wont need a lot of clean up to look best
is a skill.
the fillet is where the strength is .. the brass filler in not unusual sourced.
If you have fixturing to hold the tubes in place, tack welding is unnecessary. Standard, low-fuming bronze is just fine for fillet brazing.
I built one filet brazed frame in 1988 and never built another. Too much aggravation for a hobbyist. That said I still ride that bike most everyday and it is my favorite hardtail MTB.
I didn't have a jig that would allow me to braze all around the tube, So I tacked it with some nickel-silver rod that melts at a higher temp than brass rod. Worked very well.