I've been playing with brazing for several weeks. I've made several practice joints and not many have been exactly how i wanted them but most have been strong and reasonably well shaped. There are still plenty of issues though.
For the next step in the learning process i made a rear rack and brazed it permanently to the frame of an old bike i have. I took pictures and video, hoping for some feedback. I'm afraid you can't see much in the video, as is typical in torch or welding operations due to the brightness. I don't think i can do custom exposure in video mode with this camera. Maybe i should have put an extra pair of welding goggles in front of the lens?!
Any advice is much appreciated.
Video is 5 minutes, I braze two joints.
First, i clean the tube, using any combination of filing or sanding with 220 sandpaper or emery cloth
I brush on the flux
Brazed jont - why is it mostly so nasty looking? Is this oxidation? Did i get it too hot? (Note, there is brass all the way around, but some of it is covered with that black crap, the nice looking brass is just the last two spots i worked on).
Brazed jont - why is it mostly so nasty looking? Is this oxidation? Did i get it too hot?
I assume i have to repeat the entire cleaning process and get rid of all that crap before re-heating this and trying to build up a larger fillet?
This is a different one, after a lot of cleanup work. Not terrible looking, but a little bit porous. I thought maybe i could put a little heat to it and flow out those pits, but i'm afraid i'll just mess it all up.
Here is the whole rack