Brazing is a joining technology that does not melt the base material but instead melts and flows a filler metal with a lower melting point than the base material, filling and solidifying it in the joint gap through capillary action. This method is particularly effective for dissimilar metal joining and thin sheet joining because it involves minimal heat input to the base material and can suppress distortion. It achieves high joint strength and excellent hermeticity and liquid tightness, and is suitable for complex shapes and multi-point simultaneous joining. Key applications include heat exchangers and piping in automotive parts, refrigerant piping in air conditioning equipment, heat sinks in electronic components, and tip joining for carbide tools. Representative heating methods include furnace brazing (vacuum furnace, atmosphere furnace), torch brazing, and induction brazing, which are selected based on the brazing target and productivity. For quality control, the selection of filler metal, cleanliness of the joint area, and precise control of heating temperature and time are essential.