Welding elbow is "shrimp bends", which can be in or on a steel plate welded pipe after cutting stock from the system, its specifications can be great. The number of sections with a bending radius bend freely determined by the producer. Welding is not very round bend along both bend radius are not large, usually about 1 times the pipe diameter. As for the appearance of weld elbow, then we talk about it the appearance of welding elbow. After welding elbow looks are fixed, of course, the general appearance of the welding elbow are depending on the selection of welding steel pipes and elbows different knowledge, therefore, in order to protect the weld elbow appearance, usually come in steel If there is no rain is washing over into the yard, then after high temperature welding elbow to push the system, general appearance are welded elbow appeared blue, of course, if the rain washed over, we conduct high temperature heating , out of the heating surface colors are red welding elbow. But on the whole, we do not guarantee rain wash pipe is difficult, because the yard is among the summer rain had rinsed after fog, then the surface of the elbow to push the system out of the welding is red. Seamless elbow: elbow pipe fittings for a turn at. All fittings in piping systems in use, the largest proportion, about 80%. Typically, the wall thickness of different materials or to select a different bend forming process. Currently, the factory used the hot forming process seamless elbow pushing, pressing, extrusion. Hot push elbow forming process is the use of special elbow pushing machine, the mandrel and the heating device, so set in the blank mold under the impetus pushing machine forward movement, is heated in the movement, expanding and bending process. Hot push elbow tube diameter deformation characteristics are determined in accordance with the law of constant volume before and after plastic deformation of metallic materials, used in the elbow tube diameter less than the diameter of the mandrel through controlled deformation of the blank, the inner arc of the compressed metal flow, to other parts of the compensation due to the enlarged diameter and thinned, thereby obtaining a uniform wall thickness of the elbow. Hot push elbow forming process has a beautiful appearance, uniform thickness and continuous operation, suitable for mass production characteristics, and thus become carbon steel, alloy steel, the main method of forming the elbow, and is also used in certain types of stainless steel elbow The forming. Forming process heating intermediate frequency or high frequency induction heating (heating coil for multiple laps or lap), flame heating furnace heating and reflection, depending on what kind of heating energy requirements and shaping the product of decisions. Stamping elbow was first used in mass production of seamless elbow forming process, at present, the production of common specifications elbow has been replaced by extrapolation or other hot forming process, but in some specifications due to elbow production of a small number, thickness too thick or too thin. When the product is still in use with special requirements. Elbow bend press forming using the outer diameter and equal to the tube, using the direct compression in a mold press forming. Before stamping, tube placed on the lower die, the inner core and the end of the tube into the mold, the mold pressing downward movement started by the constraints and support role within the mold so that the outer mold forming elbow. Compared with hot push technology, visual quality is better than the former stamping; stamping elbow when forming outside the arc in tension, no other parts of the excess metal to compensate, so the thickness of the outer arc of about 10% to about thinning . However, as for single-piece production and low cost, it is used for stamping elbow craft small batch manufacturing thick elbow.