The basic technological process of carbon steel elbow is as follows: first, weld a polygonal polygonal ring shell or a polygonal sector shell with closed ends. After the internal pressure medium is filled, apply internal pressure. Under the internal pressure, the cross section gradually changes from polygon to circle, and finally becomes a circular ring shell. As required, a circular ring shell can be cut into four 90 ° elbows or six 60 ° elbows or elbows of other specifications. This process is suitable for manufacturing large elbows of any specification with a ratio of elbow pitch diameter to elbow inner diameter greater than 1.5 times. It is an ideal method for manufacturing large carbon steel elbows.
The advantages of the carbon steel elbow manufacturing process are mainly shown in the following aspects:
(1) It does not need pipe blank as raw material, which can save the cost of pipe making equipment and mold, and can obtain carbon steel elbow with any large diameter and relatively thin wall thickness.
(2) The blanks are flat plates or developable curved surfaces, so the blanking is simple, the accuracy is easy to ensure, and the assembly and welding are convenient.
(3) For the above two reasons, the manufacturing cycle can be shortened and the production cost can be greatly reduced. Because no special equipment is required, it is especially suitable for processing large carbon steel elbows on site.
(4) Carbon steel elbow is suitable for pipeline series in petroleum, natural gas, chemical, hydropower, construction and boiler industries.
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