Control method and tooling for welding deformation between connecting pipe and cylinder with inner diameter di<600mm

Abstract

The invention discloses an anti-deformation tool for a thin-walled cylindrical body with a connecting pipe and an inner diameter Di<600mm, which comprises a round bar, an inner support tube, an inner support plate, and a J-shaped plate. The inner support tube and the inner support plate are set on the round bar. After the inner support plate bears the external force applied vertically, the inner support tube is pressed against the inner wall of the welding groove of the cylinder, and the inner support tube forms a radial support for the inner wall of the welding groove, and the J-shaped plate is symmetrically connected to the round bar On the inside, the edge of the connecting pipe flange is placed in the inner recess to ensure that the crotch size L of the two connecting pipe flange surfaces is the upper tolerance limit, so as to ensure that the axial constraints of the welding seam between the connecting pipe and the cylinder body are consistent. It also discloses a method using the above The control method of the welding deformation of the tooling can effectively control the collapse and deformation of the cylinder.

Description

technical field [0001] The invention relates to the technical field of welding, in particular to the technical field of welding of a nozzle and a thin-walled cylinder. Background technique [0002] The control of the collapse deformation of the welding nozzle and the cylinder has always been a technical problem in the field of heat exchanger and pressure vessel manufacturing. However, once the deformation of the connecting pipe and the cylinder body after welding is out of tolerance and cannot meet the requirements through calibration, it will bring inconvenience to the field installation interface and other aspects, and even cause the product to be scrapped in serious cases. [0003] At present, in order to control the welding deformation, when the inner diameter of the cylinder D i When it is ≥600mm, the welding deformation of the nozzle is generally controlled by opening the inner groove of the nozzle hole + welding hoop on the outer side of the cylinder or welding suppo...

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Problems solved by technology

4. Overall collapse: the flange collapses to the inside of the cylinder as a whole, and the plane elevation of the flange after welding is lower than the plane elevation before welding

[0006] The welding deformation of the above flanges will cause the following hazards: 1. The flange surface is uneven, the flange loses its sealing performance, and the product cannot be tested for hydrostatic pressure, let alone installed and operated; 2. The overall flange surface collapses, resulting in damage to the external connecting pipeline. The installation position and installation size deviate from the original design requirements. In order to ensure the design requirements, the external connection parts connected to the flange need to be processed separately according to the actual situation, causing great losses to the user.

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