I use a Victor with a #4 (acetylene) tip with an oxy / propane setup and this works really well and have a smaller generic torch with a smaller #2 tip that I can use for very small fittings and very small work areas.

The Victor #4 tip will heat up pretty much anything, (like all thread and 3/4 inch nuts) and does a wonderful job on more delicate things like frames and racks as it has a very well controlled flame.

I love the Victor, it feels good in the hand and

We use flux coated brass rod with most of the flux knocked off as well as paste flux and silver (when the job requires it) but there is very little you cannot do with brass and as we filet braze most of our work, brass is what we use.

As for the process it is knowing how to read the materials as they heat up and being able to use gravity and that heat to draw the filler where it is supposed to be, and knowing that it does not take much filler to make a strong joint if the penetration is 100%.

I added a bunch of fittings here, all done with brass... rack mount, brake posts, cable guides, and bottle mounts.



Small fittings get a little coating of brass at the contact points before they go on and then when you set them to the frame and heat them up the brass flows and the joint is very clean.