I know that welding aluminum is difficult and the equipment is expensive, since I have been looking to fabricate a new manifold out of old manifold parts plus new aluminum tubing. I see advertisements for brazing rods made for aluminum, claiming high strength and ease of use. The rods melt around 800 degrees and aluminum goes somewhere past 1100, so they claim you can easily braze and even build up broken parts like boat propellor tips or broken flanges or stripped threads, using a propane torch for small parts and MAPP or oxy acetylene for bigger. has anyone here used these? They are expensive ($45/pound) but if they do what they claim they clearly are worth it.Would I be able to braze intersecting pieces of large diameter aluminum tubing together using this stuff? How about brazing together sheets of aluminum to make a box for a plenum? Or am I better off taking my stuff to a professional welder?