Development and Application of Plasma Flame Brazing Technology

Abstract

The conventional flame brazing using combustible gas and oxygen flame as the heat source for welding, it has the problems such as high energy consumption, no environmental protection, potential safety hazard and so on. In order to avoid the above problems, based on the characteristics of plasma arc and plasma brazing, a novel method of plasma flame brazing (PFB) is proposed. In the process, the plasma non-transfer arc is converted into the heat source, the flame energy density formed by the compressed gas through the non-transfer arc is enough for flame brazing. In this paper, the equipment for the process was developed, including key technologies such as independent arcing seat, nozzle structure optimization, nozzle cooling system and power supply. The reliability of the technology and equipment have been verified through practical application.