Hey Ed...Brazing Tungsten is one of the more difficult metals to achieve. When brazing, both the parent and daughter metal have to go to a point of "wettness" to allow the brazing compound to grab ahold of the mating surfaces. Tungsten, being that it has such a high melting point, is going to be difficult to meet the wet point of the metal with standard propane/MAPP gas applications. Oxy/Acetylene does produce the heat needed but it also adds too much oxygen to the surfaces of the metals and quickly creates oxides. Even with high quality fluxes, the oxygen content is still excessive and the flux is unable to hide the metals from the oxygen, thus resulting in a weak bond. Seems that a method of submersing the 2 metals in a flux bath and an electrical weld would probably be the best bet for home brew situations.
Im interested in what application you have in mind for this dime n wire spark gap...
Scot D Ed Phillips wrote:
Ed,If flux is a problem, make your own! Muriatic acid (hydrochloric acid) zinc chloride (broken pennies dropped in the hydrochloric acid) and some ammonia. I haven't been able to find good fluxes anymore, and this stuff seems to work good, just don't spill any! And for kicks, when you are creating your zinc chloride, you can collect the hydrogen gas and play with it (popping filled balloons, etc.) Good luck.Scott Bogard."Lack of flux isn't a problem - it's the effectiveness. I have several different types here including the "killed acid" you mention. None of it does a thing on the tungsten.Ed _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla
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