the raw material is heated to the desired temperature

　　The pressing elbows, tees or forged fittings when they are forming, usually the raw material is heated to the desired temperature, and then placed in a mold pressing or forging. The welded pipe fittings, including two situations: one is to use the welding pipes as raw material. Pipe factory, the adoption of the pipe fittings forming process is the same  as seamless pipe forming process. Pieces of pipe fitting forming process does not require welding process ; the other is the pipe factory need to do the welding process, such as a monolithic plate pressing after assembly and welding into a elbow shaped, steel plate welded into a tube and then pressing into a tee etc.

　　Welding fittings commonly used SMAW, GMAW welding and Automatic Welding. Hebei Shengtian Pipe Fittings Group Ltd will test the butt welded fittings, such as pipe size, appearance, thickness, hardness, weld X-ray detector on the welding line, and other testing to ensure standard quality.

　　Butt welding pipe heat treatment process is an important part of the pipe fittings manufacturing. By heating, heat preservation and cooling of the heat treatment step, eliminate the forming process of work hardening, residual stress, the metal deformation defects, etc., make the pipe after forming metal organization, performance, change, return to the front of the deformation processing of status, or make it improved and improve performance. Commonly used equipment for heat treatment is furnace, etc.; The usual control method for the furnace thermocouple automatically by the sensor is connected to the temperature - time recorder on the control unit. Different pipe fittings product standards for the regulation of heat treatment is not the same. Not all  the deformation of the pipe fittings are to be heat treatment, usually, for low carbon steel material pipe fitting its final forming temperature is not lower than 723 ℃ (recrystallization temperature), can be heat treatment, not because of the temperature under the condition of its ultimate state of organizations is basically normalizing state, or lower than that temperature or higher than 980 ℃ heat treatment should be; Generally speaking Alloy steel or stainless steel material pipe fittings whether using cold forming or hot forming, heat treatment is a must need. Carbon steel butt welded pipe fittings no need heat treatment.