Pipe fittings are mainly connected, controlled, variable direction, shunt, seal, support and other parts of the general designation. Pipe fittings It is very widely used, whether it is in life, or many occasions in industry will be used in pipe fittings, the general different fittings it has different applications. The surface treatment of pipe fittings is more important. In recent years, the concept of environmental protection has become a primary consideration in the surface treatment of pipe fittings.
Pipe fittings, especially the three-way, elbow and size in the pipeline construction process is more and more common, which is mainly due to its good shape, pressure resistance, welding form simple and so on, to ensure the capacity of the pipeline pressure.
In the case of high temperature and high pressure, the surface treatment of pipe fittings is very easy to explode. In the event of an accident, it will cause great harm to people and the environment.
Pipe fittings can be used bending, extrusion, push, molding, machining, such as cold or hot processing method of forming, but the forming method should be done so that the tube does not produce harmful defects.
It is possible to adopt forging, pressing, punching, pier forging, rolling and other forming methods when making pipe fittings with forged rolling cylinder or bar. The forging cylinder or bar shall be inspected by mechanical properties, chemical compositions and ultrasonic inspection to meet the requirements of the corresponding standards.
When making pipe fittings by means of mechanical processing, the nominal size is limited to less than or equal to DN100, and no bar can be made directly by machining method to make elbow, tee and quadruple.
Manufacturing process should ensure that the shape of the tube in the shape of the arc transition part of the smooth.
The end of the pipe should be machined to the groove, and its size and shape shall conform to the requirements.
The maximum envelope line of the transition part of the weld end of the pipe should meet the requirements.