Effect of heating process on microstructure and plasticity of copper-phosphorus brazing filler metal during thermoplastic drawing process

The change of cold brittleness, thermoplasticity, and thermoplastic process ability of copper-phosphorus brazing filler metal during drawing process was investigated under different heating methods, and the relation between the heating method as well as the temperature control method for copper-phosphorus brazing filler metal and the output characteristics of power supply was also studied in this paper. It is found that the relatively stable heating temperature was the key to efficient drawing. In many heating methods, DC high frequency switching power supply had several advantages, such as easy control of heating temperature, high conversion efficiency from electric energy to heat energy, and the stability of drawing process.