Method for controlling and correcting large box structural part fillet weld deformation

Abstract

The invention discloses a method for controlling and correcting large box structural part fillet weld deformation. The method comprises the step: a box is bottomed with a box hoarding through high-energy beams to be welded, and then the bottomed and welded positions are subjected to filling welding through traditional welding; stress values generated by welds and areas within the preset range of the welds under the deformation state are calculated, and the stress states generated by the welds and the areas within the preset range of the welds after heat source applying are calculated; a firsttemperature field needing to be applied to internal self-fluxing of the welds is determined, and the first temperature field is applied to eliminate the deformation of the middle part, facing the exterior of the box, of the box hoarding; and a second temperature field applied to outer surface self-fluxing of the welds is determined, and the second temperature field is applied to eliminate the deformation of the middle part, facing the interior of the box, of the box. According to the method, the dimensional stability of box structural parts can be effectively ensued, and welding deformation isobviously corrected; and a large box structural part fillet weld deformation mechanism is researched through finite element calculation means, the research and development costs are lower, and the efficiency is higher.

Description

technical field [0001] The invention relates to a method for correcting deformation of fillet welds of large-scale box structure parts, which belongs to the field of welding technology and is mainly used for correcting deformation of welded structures. Background technique [0002] Due to the simple manufacturing process and low cost, large box structural parts have been widely used in various industrial fields. The parts of the box components are mostly connected by welding. For thicker components, due to the high welding heat input, it is difficult to control the welding deformation. In production, once the deformation of the workpiece is out of tolerance, the correction work The workload is even larger than the welding workload, and it is difficult to fully meet the technical requirements of the product after correction. [0003] At present, domestic research on the control of welding deformation of large-scale box structures is mostly focused on heat treatment, mechanic...

AI Technical Summary

Problems solved by technology

The parts of the box components are mostly connected by welding. For thicker components, due to the high welding heat input, it is difficult to control the welding deformation. In production, once the deformation of the workpiece is out of tolerance, the correction work The workload is even greater than the welding workload, and it is difficult to fully meet the technical requirements of the product after correction

[0003] At present, domestic research on the control of welding deformation of large-scale box structures is mostly focused on heat treatment, mechanical orthopedics, etc. The heat treatment process has a better effect on component welding correction, but due to the limitation of the space size of the heat treatment furnace and components, the application of heat treatment technology is relatively limited. , and the cost is higher

Mechanical orthopedic technology mostly uses fixtures during the welding process and applies concentrated loads to local areas after welding to achieve the effect of controlling deformation. The cost advantage of mechanical deformation control technology is very obvious, but the control of deformation accuracy is insufficient

[0004] Welding is a very complex process involving multiple disciplines such as arc physics, heat transfer, metallurgy, and mechanics. If the research on welding deformation relies entirely on experiments, it will directly cause problems such as high R&D costs and low efficiency.

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