A Welding Groove Processing Method for Pressure Vessel Non-Central Connector and Cylinder

Abstract

The invention discloses a machining method for a welding groove of a non-centripetal connecting pipe and a barrel body of a pressure container. The machining method comprises the steps that the barrel body is drawn at first, an open hole is drawn in the barrel body, and then an open hole lofting line and an initial centripetal hole lofting line are drawn; and then the welding groove is machined by utilizing a barrel body outer side lofting graph and a barrel body inner side lofting graph. According to the provided machining method for the welding groove of the non-centripetal connecting pipe and the barrel body of the pressure container, the accuracy of the gas cutting groove can be effectively ensured, the effect that the root of the groove cannot be damaged by the gas cutting open hole is ensured, welding deformation can further be effectively controlled, and the post-welding size of the connecting pipe is ensured.

Description

technical field [0001] The invention relates to a welding groove processing method, in particular to a welding groove processing method for a non-central connecting pipe and a cylinder body of a pressure vessel. Background technique [0002] Non-central joints are a common structural form in pressure vessel products. For the welding groove processing method of joints and cylinders, the conventional practice is to mark the V-shaped groove angle β between the joints and the cylinder in the drawing. However, after using this method to process the bevel of the non-central nozzle, the groove at the acute angle formed by the nozzle and the cylinder will have too much space in at least 1 / 4 of the circumference, resulting in a lot of welding deposited metal during the welding process. Filling amount; on the other side symmetrical to it, the welding deposit metal filling amount is less, resulting in a huge difference in heat input during the welding process on both sides of the nozzl...

AI Technical Summary

Problems solved by technology

However, after using this method to process the bevel of the non-central nozzle, the groove at the acute angle formed by the nozzle and the cylinder will have too much space in at least 1 / 4 of the circumference, resulting in a lot of welding deposited metal during the welding process. Filling amount; on the other side symmetrical to it, the welding deposit metal filling amount is less, resulting in a huge difference in heat input during the welding process on both sides of the nozzle, and this phenomenon increases with the distance between the nozzle and the axial center of the cylinder. increase and increase

Therefore, such a groove form causes the following two serious problems after the non-central joint and the cylinder are welded:

[0003] 1) The connecting pipe is seriously deformed, and the connecting pipe is deformed toward the center of the cylinder. When the connecting pipe is welded to the external pipeline or connected to the flange, it will cause misalignment and cannot be carried out; Functional failure of the inner liquid position

[0004] 2) The cylinder is deformed. If the thickness of the cylinder is thin, it will cause a large deformation of the cylinder at the welding position

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