A control method for welding deformation of large-size super-thick bridge steel tower pressure-bearing plate

Abstract

A method for controlling welding deformation of a large-size super-thick bridge steel tower pressure plate, comprising the following steps: (1) According to the principle of the shortest length of butt welds, the pressure plate is divided into five longitudinal welds and one transverse weld It is a splicing unit of 12 pieces; (2) Design the form of the weld groove as a double-sided symmetrical U-shaped groove, so that the amount of welding on both sides is basically equal, and the tendency of welding deformation to one side is reduced; (3) Reasonable design of the assembly sequence , and use the gas shielded welding bottoming and submerged arc automatic welding filling process welding to reduce the influence of welding on deformation; (4) use pre-deformation to set a reasonable welding pre-deformation before welding to reduce the influence of welding on deformation; (5) ) Flip along the direction of the weld seam when turning over during welding to prevent elastic-plastic deformation from enlarging the welding deformation. The invention greatly reduces the welding deformation of the thick plate and reduces the follow-up correction amount. The mechanical properties of the steel are ensured to the greatest extent. The construction efficiency is improved and the construction period is shortened.

Description

technical field [0001] The invention belongs to the technical field of welding deformation control, and in particular relates to a method for controlling welding deformation of a pressure-bearing plate of a large-size super-thick bridge steel tower. Background technique [0002] Ultra-thick plates have been used many times on domestic large-scale bridge steel towers, and they have relatively mature welding experience, but the control of welding deformation has always been a difficult point. In the past, in the welding of ultra-thick plates, although certain pre-control measures have been taken, the deformation after welding is still relatively large, and it needs to be trimmed by thermal correction. It is difficult to meet the expected flatness requirements, which greatly increases the construction cost and reduces the construction efficiency. It also has an adverse effect on the mechanical properties of steel. Contents of the invention [0003] The object of the present ...

AI Technical Summary

Problems solved by technology

Combining the structural specifications of the existing ultra-thick steel plates, as well as road transportation, mechanical processing level, lifting capacity, welding equipment, etc., from the number of welds, welding filling, welding process parameters, butt joint assembly, welding pre-deformation and multiple turning over Formulate control measures for welding and other aspects, realize the control of welding deformation of large-scale ultra-thick plates, and effectively solve the technical problems of welding deformation of ultra-thick steel plates

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