Deformation control method and tool of welding between connecting pipe and cylinder with internal diameter Di less than 600mm

Abstract

The invention discloses a tool for preventing deformation between a connecting pipe and a thin-walled cylinder body with an inner diameter Di less than 600mm. The tool comprises a round rod, an innersupporting tube, an inner supporting plate and J-shaped plates. The inner supporting tube and the inner supporting plate sleeve the round rod. After the inner supporting plate bears external force applied vertically, the inner supporting plate enables the inner supporting tube to abut against the inner wall at a welding groove of the cylinder body, and the inner supporting tube forms radial support to the inner wall at the welding groove. The J-shaped plates are symmetrically connected to the round rod, edges of connecting pipe flanges are placed in concave parts of the J-shaped plates, and itis ensured that the opening size L of the two connecting pipe flanges is the upper tolerance limit, so that it is ensured that axial constraints of a welding seam between the connecting pipe and thecylinder body are consistent. The invention further discloses a welding deformation control method using the tool, so that the collapse deformation of the cylinder body is effectively controlled.

Description

technical field [0001] The invention relates to the technical field of welding, in particular to the technical field of welding a connecting pipe and a thin-walled cylindrical body. Background technique [0002] The control of the welding collapse deformation between the 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 is out of tolerance and cannot be corrected to meet the requirements, it will bring inconvenience to the field installation interface, etc., and even cause the product to be scrapped in severe cases. [0003] At present, in order to control the welding deformation, when the cylinder inner diameter D i When it is ≥600mm, it is generally adopted to control the welding deformation of the connecting pipe by opening the inner groove of the connecting pipe hole + installing a welding hoop on the outside of the cylinder o...

AI Technical Summary

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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