Article
Flash butt welding machine diagram
Resistance butt welding andflash butt weldingThe main workpieces that need to be annealed afterwards are ferroalloys, high carbon steels, manganese steels, stainless steels, etc. This is related to the structure of the materials after welding at high temperatures. The main function of annealing is to reduce the hardness, facilitate cutting and processing, eliminate the internal stress of the metal, stabilize accuracy, and resist deformation and cracks. Make the grains fine and the organization tight to reduce defects.
Annealing is a heat treatment process in which metal is heated to a certain temperature, kept at this temperature for a period of time, and then slowly cooled to room temperature.
Annealing methods include complete annealing, incomplete annealing, isothermal annealing, homogenizing annealing, spheroidizing annealing, stress relief annealing, etc. There are three commonly used methods: complete annealing, spheroidizing annealing and stress relief annealing. 1. Heating the metal to a predetermined temperature, keeping it warm for a period of time, and then slowly cooling it in the furnace is called complete annealing. 2. Heat the steel to 750 degrees, keep it warm for a period of time, slowly cool it to 500 degrees, and finally cool it in the air called spheroidizing annealing. The purpose is to reduce the hardness of the steel and improve the cutting performance. It is mainly used for high carbon steel. 3. Stress relief annealing is also called low-temperature annealing. The steel is heated to 500~600 degrees, kept warm for a period of time, slowly cooled in the furnace to below 300 degrees, and then cooled to room temperature. The structure does not change during the annealing process, and the internal stress of the metal is mainly eliminated.
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