Box-type column thick plate welding technology and welding deformation control method

Abstract

The invention provides a box-type column thick plate welding technology and welding deformation control method. The method is characterized by comprising the following step one of the box-type column thick plate welding technology and the step two of the box-type column thick plate welding deformation control method. The box-type column thick plate welding technology comprises the following step a of matters needing attention before welding; the step b of preheating before welding; the step c of welding parameter execution; and the step d of multi-layer and multi-pass welding. The box-type column thick plate welding deformation control method comprises the following steps that a, butt joint connectors, T-shaped connectors and cross-shaped connectors are prepared; b, subassembly welding is adopted for the large structure; c, the connectors with large contraction or angle deformation are treated; and d, a bed-jig clamp is arranged for the special-shaped thick plate structure, and then welding deformation is controlled. The box-type column thick plate welding technology and welding deformation control method has the advantages that the assembly welding technology for optimizing a box is possessed, the manufacturing precision of a huge column is ensured, the engineering quality is safe and reliable, the precision of the geometric dimension of components is ensured, the welding steps are reasonable and scientific in design, implementing performance is high, and the engineering cost is reduced.

Description

technical field [0001] The invention relates to a thick plate welding process, in particular to a box-shaped column thick plate welding process and a welding deformation control method. Background technique [0002] In the process of steel structure construction, the assembly and welding of thick plate members with different thicknesses is often encountered. Due to different thicknesses of the base metal, inconsistent weld gaps, inconsistent welding parameters selected by the welder, and uneven heating of the welds, welding stress is caused. If it is too large, it will cause cracks, cause rework, and affect the construction period of the structure. Difficulties in welding process of box column thick plate welding process: [0003] (1) A large amount of steel is used, with high strength and quality grades [0004] The steel grade of the thick plate engineering of the box column is relatively high, and the important structural parts are made of Q345B steel, and the proportio...

AI Technical Summary

Problems solved by technology

Welding is more difficult

[0005] (2) The amount of welding deposition is large, the welding residual stress is large, and the deformation is also large

During welding, the amount of deposited metal of the filler material is large, the welding time is long, and the total heat input is high, so the stress and deformation of the structure after welding are large

[0007] (3) The possibility of weld cracks is high

However, the welding steps of the thick plate of the box-shaped column of the steel structure are particular, and the method of welding multiple welding torches at the same time is not suitable for the welding of the box-shaped column in the box-shaped structure.

[0011] Therefore there is above-mentioned inconvenience and problem in known thick plate welding method

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