A manufacturing process of manhole well welded parts

Abstract

The invention relates to the field of welding technologies, and discloses a manufacturing technology for a manhole well welding part. The manufacturing technology for the manhole well welding part comprises the technological steps of steel plate blanking, steel plate rolling, cylinder inner wall reinforcing by adopting an anti-deformation positioning tool, cylinder welding, anti-deformation positioning tool disassembling, flange machining, assembling, total welding and the like, wherein the anti-deformation positioning tool comprises four arc-shaped positioning blocks which jack the inner wallof a cylinder through helical jacking mechanisms and are evenly distributed in the circumferential direction of the inner wall of the cylinder, and the arc-shaped faces of the four arc-shaped positioning blocks make contact with the inner wall of the cylinder. According to the manufacturing technology for the manhole well welding part, welding deformation of the manhole well welding part is reduced, and the manufacturing precision of the manhole well welding part is improved.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a manufacturing process of manhole well welded parts. Background technique [0002] Manhole well weldments (such as Figure 4 Shown) is a commonly used pressure vessel fitting, which is assembled and welded by a flange and a cylinder. For example, manhole well weldments are often connected to large oil storage tanks, liquid storage tanks and gas storage pipes. [0003] In the prior art, the production of the welded parts of the manhole well is to roll the steel plate into a cylinder with joints, and the joints of the cylinder are welded by spot welding, and then assembled with the flange and spot welded, and then Cylinder welding (girth welding) between the cylinder and the flange. [0004] The manufacturing process of the above-mentioned manhole well weldment also has the following problems: [0005] One is that the welding deformation of the cylinder is relatively large, wh...

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Problems solved by technology

[0005] One is that the welding deformation of the cylinder is relatively large, which often causes the cylinder to be out of round; in order to overcome this deformation, there is also a technical solution for setting a rigid positioning ring inside the cylinder in the prior art, but due to the dimensional error of the cylinder during rolling , it is easy to cause the rigid positioning ring to fit too tightly or too loosely with the inner wall of the cylinder. Anti-deformation effect

[0006] The second is that after the flange and the cylinder are assembled and welded, the flange surface will be uneven (the outer edge of the flange is all inclined to one side), and the deformation is serious, and even an umbrella-like flange will be formed.

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