Induction brazing. Check it out! One of the tricks I might have up my sleeve If I try making the DIY coolant rails.
Almost done with building a 1000w 48v liquid cooled ZVS induction coil. Not only could I melt down some aluminum scraps in a mini crucible, and cast my own little square end plugs (with a tight interference fit) for capping off the 3/4' square tube rails... but also use it to heat up the parts more equally than any other method, and get perfect water tight solder joints within seconds. Without any welding, torching, or grinding on it.. Just zap it together with high frequency pulces. Then tap out the center hole the rest of the way on the end plugs, and screw in whatever compression or hose barb fitting on each end for the tubing to connect the loop..
