Years back when Gibson closed the Dobro manufacturing plant in Nashville I grabbed a number of these stamped raw brass bodies. I have successfully trimmed the "ears" off one and am looking to make a top, sound well etc., but have never done brazing or soldering at that level. Any tips on equipment, technique etc., appreciated.
without getting too technical. you will be looking at soldering, silver solder is stronger and finer and easier to do, but would require a pinpoint torch and oxy acetylane, and extreme cleaning. it can be done with a blowlamp, but you would need to apply a lot of heat over a wide area. jewelers do fine soldering using a tiny little torch, and other gas than oxy acetylane.they dont use soft solder for obvious reasons. so soft solder, but not electrical solder. tinmans solder and killed spirit of salts for flux.is what you want. you will need a really big iron to retain the heat,and a blowlamp to heat it. you cant solder on cold metal with an electrical iron, it will just suck the heat away. edge to edge joints wont work. you will have to make a lap joint. an internal lap joint where the top and and edge of the sides have been cleaned and tinned, and clamped, should work with a hot constantly heated iron, as you are really causing the solder to flow together. this is how galvanised steel can be soldered, brass takes solder better. hope this helps, a skill that takes time and practice. jim.
Hi! Can’t post the link but put ‘National Reso-phonic factory tour 2008’ into YouTube and go to about the 31 minute mark. It’s brief but you may find it interesting. Pete is spot on, too much heat will distort the body so a lot of practice first is recommended. Good luck! Chris