Brazing is a process that uses a metal with a lower melting point than the base material as the brazing material, which is heated to more than 800F, the brazing material melts, and the weldment does not melt, and two or more metal workpieces are welded together. It is important to note that brazing should not be confused with soldering with a melting point below 800F. Sometimes silver soldering is often called silver-tin soldering, which is not right.

To be certified as a competent welder, it usually takes forty hours in the classroom and on-site training, because the main components of the refrigeration system need to be welded to a closed circuit, and each closed circuit contains The head must be guaranteed not to leak.