The scope of use of the pipe fittings is very large and often accessible in daily life. The pipe fittings are defined as follows. All products whose pipes are processed through deep processing should belong to the category of pipe fittings. Pipe processing machinery is more professional in China. The pipe bender bends the pipe fittings into a circular elbow that suits the customer's needs. Since the pipe is made of raw material and deep processed into a product, the product has the dual characteristics of the pipe and the mechanical part, and is a combination of the two. The pipe is a necessary raw material for the pipe fitting, but the pipe fitting is processed in many ways, and it can be applied as long as it is a mechanical processing method. Why the pipe fittings develop so rapidly in foreign countries, I think there are two outstanding advantages: the first is to replace some of the machined products, and it is lighter than the machined parts, castings and structural parts, saving materials; the second is the mechanical processing products. Save process and man-hours and reduce workpiece costs. There are many types of pipe fittings, and the following main types are summarized: variable-diameter pipe fittings, which reduce the diameter of a pipe end or a part of the pipe; the pipe-thickness of the wall thickness changes the wall thickness along the length of the pipe.

Change the cross-section of the pipe according to the requirements, the circular section into a square, ellipse, polygon, etc. What we are more exposed in curved pipe fittings is the straight pipe into a different radius of curvature of the bend, such as elbows, bends tubes,  tubes with flanges and rounded edges. The former means that the ends of the tubes are convex toward the inside or the outside. The latter refers to the tubular members which form the ridges or grooves in the circumferential direction of the tubes. The tubes with the crimping and the sealing type, pipes that increase the total strength of the pipe end to the outside or inside of the pipe or seal the end of the pipe. Expanding the pipe fittings and expand the end or part of the pipe to form pipes of various shapes according to requirements.

There are also many processing methods for pipe fittings.  The most used are stamping, forging, roller processing, rolling, bulging, stretching, bending, and combination processing. Pipe processing is an organic combination of machining and metal pressure processing. The following is an example, hydraulic bending method is the hydraulic pipe bending machine pipe which placed in the bending machine mold and the hydraulic power is used to bend the pipe into a curved shape to process the appearance without deformation. Hydraulic Bending Method: Accurately placing the pipe on the press machine is also a wide area of pipe used for bending the pipe with a pressure plate.