What is brazing welding?

【Summary Description】 Brazing What is brazing welding? Brazing refers to a welding method that uses liquid brazing material to fill the gap of solid workpieces to connect metals after the brazing material and the welding part which are lower than the melting point of the welding part are heated to the melting temperature of the brazing material at the same time. The brazing methods include: high frequency induction brazing, flame brazing, resistance brazing, furnace brazing, phase brazing, soldering iron brazing, ultrasonic brazing, etc. The brazing deformation is small, the joint is smooth and beautiful, and it is suitable for welding precision, complex and components composed of different materials, such as honeycomb structural plates, turbine blades, carbide tools and printed circuit boards. Before brazing, the workpiece must be carefully processed and strictly cleaned to remove oil and excessive thick oxide film to ensure the interface assembly gap. Most of the flux residue has a corrosive effect on the brazed joint and hinders the inspection of the brazing seam, which often needs to be cleaned up. The residue of the active flux containing rosin can be removed with an organic solvent such as isopropyl alcohol, alcohol and trichloroethylene. The flux composed of organic acid and salt is generally soluble in water and can be washed with hot water. Solder composed of an inorganic acid is soluble in water and therefore can be washed with hot water. Flux containing alkali metal and alkaline earth metal chlorides, such as zinc chloride, can be washed with a 2% hydrochloric acid solution. The borax and boric acid flux residues used for brazing are basically insoluble in water and difficult to remove. They are generally removed by sandblasting. The better method is to put the brazed workpiece into water in the hot state, so that the flux residue is cracked and easy to remove. What is fiber welding It refers to the welding method in which the gap between the solid workpiece is filled with liquid filler metal after the brazing material and the welding part which are lower than the melting point of the welding part are heated to the melting temperature of the brazing material at the same time. When brazing, the oxide film and oil stain on the contact surface of the base metal should be removed first, so as to facilitate the capillary function after the solder melts and increase the wettability and capillary fluidity of the solder. According to the different melting point of the solder, brazing can be divided into brazing and soldering. The brazing deformation is small, and the joint is smooth and beautiful. It is suitable for welding precision, complex and parts composed of different materials such as honeycomb structure plates, turbine blades, hard alloy tools, printed circuit boards, etc. Before brazing, the workpiece must be carefully processed and strictly cleaned to remove oil and thick oxide film to ensure the assembly gap of the interface. The gap is generally required to be between 0.01 and 0.1mm. Brazing application features: (1) The brazing heating temperature is low, the joint is smooth and smooth, the organization and mechanical properties change little, the deformation is small, and the workpiece size is accurate. (2) The same metal or different materials can be welded, and there is no strict limit on the thickness difference of the workpiece. (3) Some brazing methods can weld multiple weldments and joints at the same time, with high productivity. (4) The brazing equipment is simple and the production investment cost is low. (5) the joint strength is low, the heat resistance is poor, and the cleaning requirements before welding are strict, and the solder price is more expensive.

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