Welding achieves the purpose of joining through the following three ways:
1. Fusion welding – heating the workpieces to be joined to make them partially melt to form a molten pool, and then join after the molten pool is cooled and solidified. If necessary, fillers can be added to assist. It is suitable for welding processing of various metals and alloys. pressure.
2. Pressure welding – the welding process must exert pressure on the weldment, which belongs to the processing of various metal materials and some metal materials.
3. Brazing—Using a metal material with a lower melting point than the base metal as the solder, using liquid solder to wet the base metal, filling the joint gap, and interdiffusion with the base metal to realize the joint weldment. It is suitable for welding processing of various materials, and also suitable for welding processing of different metals or heterogeneous materials.