Welding and reshaping method of lightering floating platform cantilever crane plate

Abstract

The invention provides a welding and reshaping method of a lightering floating platform cantilever crane plate, and relates to the welding and reshaping method of a large-scale structure plate. Before welding, flame heating is carried out on the position 100-500mm away from a welding line position, the heating width is 10-20mm, and therefore the temperature of a steel plate can reach 300-500 DEG C. Welding is carried out for welding structural steel to the steel plate, back chipping is carried out after welding, then flame heating is carried out on a welding line and the position 100-500mm away from the welding line position, and therefore the temperature of the steel plate can reach 500-700 DEG C, and deformation caused by welding stress can be corrected. The welding and reshaping method reduces deformation of the cantilever crane plate effectively, improves welding quality, is low in production cost and has wide application prospect.

Description

Technical field [0001] The invention relates to a welding and shaping method for large-scale structural panels, in particular, to a welding and shaping method for a transfer floating platform arm frame plate. technical background [0002] Boom is an indispensable part of large equipment such as ship loader and barge floating platform. Boom system generally mainly includes fixed boom, telescopic boom, telescopic mechanism, etc., telescopic boom and fixed boom are made of steel For the truss structure welded to the boom plate, the boom plate is welded by section steel and steel plate. Welding the section steel to the steel plate is to improve the structural stability of the boom plate, so the quality of the boom plate will be directly Affect the performance of the entire equipment, the length of the welding seam is as short as a few meters, and the length is tens of meters. It is easy to deform after welding. Preventing welding deformation and post-welding shaping are the problems ...

AI Technical Summary

Problems solved by technology

This traditional production process is inconvenient to operate, and it is difficult to turn over the large boom plate after welding. During the turning process, the boom plate may be deformed again, which will affect the overall performance of the boom

[0003] For the welding of large plates, Hudong Zhonghua Shipbuilding Co., Ltd. Dong Huafu and others applied for an invention patent "a method for avoiding terminal cracks during tailor welding of large plates", patent application number: CN200810042413, the patent uses two welding machines For welding, the front welding machine is at the middle arc starting position, and the rear welding machine is at the starting position of the welding position. According to the shape and size of the welding seam design process block, the process block is placed at the middle arc starting position, and then passed Carbon planing completely removes the process block. This method needs to weld the process block, remove the process block after welding, and need to turn over the large plate, which is troublesome and inconvenient. The most important thing is that it cannot eliminate the deformation of the plate during the welding process.

Luo Zhongxi, Yichang Jiangxia Marine Machinery Co., Ltd., applied for the invention patent "Correcting method of welding deformation of large plate-shaped structural parts", patent application number: CN201110341039. In this patent, a certain number of process pads are placed at a certain distance under the workpiece, and By adjusting it to different height dimensions, the top of each process block is connected to make the workpiece produce a certain amount of anti-deformation; heating in the furnace to make the workpiece produce preset plastic deformation; correct the large plate-shaped structure by the above method The welding deformation of the parts, this method requires welding process pads, and the large plate components need to be placed in a large heat treatment furnace with a crane, and then lifted out to remove the process blocks, the operation is troublesome, and real-time monitoring cannot be achieved in the furnace

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