Welding method for vertically spliced super-thick steel plate

Abstract

A welding method for a vertically spliced super-thick steel plate is a welding method for a super-thick steel plate with the thickness ranging from 60mm to 120mm. The method is characterized by including: hoisting a primarily spliced super-thick steel plate onto a special jig frame for horizontal welding, fixing the super-thick steel plate with a waler of the jig frame by welding prior to fastening the super-thick steel plate with a ground abutting floor stand by the aid of a wedge, then using carbon dioxide arc welding for sequential symmetry horizontal welding on the front side and the back side of the super-thick steel plate respectively by even welders until spliced plate welding is finished, and finally performing postheat treatment to prevent cracks. The method has the advantages that welding deformation of the spliced super-thick steel plate can be well controlled, welding deformation correction is avoided, welding cracks are prevented, welding quality is improved, and construction requirements are met. The carbon arc air gouging process for back gouging is omitted, welding procedure is simplified, turnover times of the super-thick steel plate are decreased, workload is reduced, labor intensity is relieved, and production efficiency is improved.

Description

Technical field [0001] The invention relates to a welding method for steel plate splicing, in particular to a vertical splicing welding method for ultra-thick steel plates of 60mm to 120mm. Background technique [0002] In shipbuilding and marine engineering and steel structure construction, the thickness of thick steel plate is usually between 15mm and 45mm, and the welding of ultra-thick steel plates between 60mm and 120mm is very rare due to the difficulty of welding. [0003] In the welding of thick steel plates, generally, the steel plate is placed flat on the flat welding frame and used for submerged arc welding. The following two methods are used: [0004] First, use the X-shaped groove with a blunt edge in the middle, and use submerged arc welding to weld. After welding to a certain thickness on one side of the groove, turn over the carbon planer, and then weld the other side, and repeat until welding carry out. This method is prone to cracks in the process of welding thic...

AI Technical Summary

Problems solved by technology

Although this method avoids the turning of the steel plate, it cannot control the welding deformation very effectively, especially in the welding of thick plates, the welding deformation is slightly larger, and the welding deformation is not easy to adjust

[0006] Due to the large structural rigidity of the large-thickness steel plate, the cooling rate after welding is fast, and the weld seam is subject to greater restraint, so the residual stress on the weld seam is also large, resulting in large deformation, and it is difficult to obtain satisfactory jigsaw products. Therefore, in In the joint welding of 60mm to 120mm ultra-thick steel plates, how to control welding deformation, ensure welding quality, and meet engineering requirements has become a technical problem that needs to be solved

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