Welding, Brazing and Joining of Refractory Metals and Alloys

Abstract

Refractory metals and their alloys can be joined by gas tungsten are. electron beam, and resistance welding. Also, they can be joined by brazing and solid state bonding. In the case of brazing or solid state bonding, dissimilar metal joining is possible. The essential parameters to be carefully controlled are interstitial contents, the processing temperature relative to recrystallization temperature and the service temperature relative to the ductile-brittle transition temperature. The reactive nature of refractory metals requires the use of vacuum or inert gas atmosphere. Alternately, an oxidation resistant layer, such as copper or nickel electroplate, can be applied for high temperature service.

Keywords:

• Refractory metals
• Welding
• Brazing
• Solid state bonding