Welding deformation control fixture for welding of large-scale thin wall storage box structure and welding method

Abstract

The invention provides a welding deformation control fixture for the welding of a large-scale thin wall storage box structure and a welding method. The fixture comprises a front cover and a rear cover, wherein the shape of the front cover is consistent with that of a storage box front bottom and the front cover can cover the storage box front bottom; the shape of the rear cover is consistent with that of a storage box rear bottom and the rear cover can cover the storage box rear bottom; the end parts of both the front cover and the rear cover are provided with outer edges which protrude and extend outward; and the insides of the outer edges are tightly attached to the outer surface of a transition region of the storage box front bottom and are ring-shaped wedge surfaces. According to the method, the storage box front bottom and the storage box rear bottom are respectively connected with both ends of a storage box flange by an electronic beam welding mode. The fixture provided by the invention adopts a design method that the dead weight of the fixture is acted on a thick welded junction region of the storage box structure, so that the disadvantageous effects of the fixture on the thin region in the welding process are effectively avoided; and by utilizing the fixture, the integral rigidity of the thin wall storage box structure can be improved in the welding process and the welding deformation can be effectively prevented.

Description

technical field [0001] The invention belongs to the field of metal connection, relates to the field of welding deformation control of a large thin-walled storage tank structure, in particular to a device and method for welding and controlling deformation of a large thin-walled storage tank structure. Background technique [0002] Electron beam welding of large thin-wall tank structure is an important problem in the field of welding technology, the main reason is that the welding deformation is difficult to control. During the welding process, welding fixtures must be used to increase the overall rigidity of thin-walled structural parts, so that welding deformation can be effectively controlled. The welding fixture itself must have sufficient rigidity. Generally, the weight of the welding fixture is relatively large. For thin-walled structural parts, it cannot bear the heavy weight of the welding fixture itself. Conventional welding fixtures cannot be reliably fixed with thin...

AI Technical Summary

Problems solved by technology

The welding fixture itself must have sufficient rigidity. Generally, the weight of the welding fixture is relatively large. For thin-walled structural parts, it cannot bear the heavy weight of the welding fixture itself. Conventional welding fixtures cannot be reliably fixed with thin-walled structural parts, resulting in Can't be assembled, so can't be welded

[0003] At present, the outer diameter of the large thin-walled tank is greater than 600mm, the wall thickness of the flange of the tank is 2.0~6.0mm, and the wall thickness of the front and rear bottom of the tank is less than 2.0mm. If a common welding fixture is used for a tank of this size, Due to its small rigidity and weak strength, yield deformation occurs under the action of heavy welding fixtures. Not only can it not be assembled and welded, but it may also cause local plastic deformation of the thin-walled storage tank and be scrapped.

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