Microstructure of Cu-Zn-Al Shape Memory Alloys Joined by Electric Stored-Energy Welding
Electric welding with energy stored in condensers offers the advantage of a reduced welding power and a better balance of the energy supplied in the joining area of the components. It can also supply hard thermal regimes in a short time, while the heat is generated only by the contact resistance. This is a major advantage for welding materials with high thermal conductivity, among which are the copper “based shape memory alloys. Since the energy accumulation only needs a few seconds and is released in very short time, it has favorable influence on welding, so that the effect on the shape memory effect is reduced. The paper details the process of electric stored-energy point welding, the structural and phase transitions in the welded seam and in the heat affected zone, as well as the influence of the welding process on the shape memory effect.
Yves Bréchet, Emmanuel Clouet, Alexis Deschamps, Alphonse Finel and Frédéric Soisson
I. Mitelea et al., "Microstructure of Cu-Zn-Al Shape Memory Alloys Joined by Electric Stored-Energy Welding", Solid State Phenomena, Vols. 172-174, pp. 208-213, 2011