Concentricity control method for axial welding of multilayer annular plates

Abstract

The invention provides a concentricity control method for axial welding of multilayer annular plates. The concentricity control method includes the following steps: (1) an assembly datum plate with the shape, position and size meeting the design requirement is manufactured; (2) quadrantal points of the assembly datum plate and the annular plates on all layers are determined, and line scribing is carried out on the outer edges or the inner edges of the assembly datum plate and the annular plates on all layers in the plate thickness direction; (3) the assembly datum plate is leveled; (4) the annular plates on all layers are assembled, wherein the annular plates to be assembled are primarily positioned through pipe spacers, plumb lines are hung on the four quadrantal points, four data are obtained by measuring the absolute value of the size difference between the distance from the plumb lines to the quadrantal points of the annular plates to be assembled and the distance from the plumb lines to the quadrantal points of the datum plate, the difference value between the maximum value and the minimum value of the four data meets the assembly positioning requirement through adjustment, the plumb lines are aligned to the scribed lines, in the plate thickness direction, of the to-be-assembled annular plates and the assembly datum plate, and positioning welding is carried out; and (5) axial structural members welded to the assembly datum plate and the annular plates. By means of the steps, the concentricity of the multilayer axially-welded annular plates is controlled.

Description

technical field [0001] The invention relates to a welding method for large structural parts, in particular to a concentricity control method for axial welding of multilayer ring plates. Background technique [0002] The stator frame is the shell part of a large generator. Its main function is to support the rotor and fix the stator core. The overall size of the main body is 3800mm in diameter, 8200mm in axial length, and weighs 95 tons. The 18 key rods uniformly distributed on the inner circumference of the stator frame are used for positioning and fixing the stator core, and are welded on 4 core rings and 4 support rings. If the concentricity error of the stator frame is too large after welding ( >3mm), the key stick cannot be installed. See the specific structure figure 1 . [0003] The stator base is composed of an inner frame and a cylindrical shell covering the outer circle, see figure 1 . Its manufacturing process is to complete the assembly and welding of th...

AI Technical Summary

Problems solved by technology

[0004] The assembly work of the stator base is completed on a large assembly platform. Generally, the flatness and levelness errors of a large-size assembly platform are greater than 3mm. The alignment method of parts cannot guarantee the concentricity requirements of the stator frame

As the size of structural parts increases, the stress and deformation caused by welding also increase, and it is very difficult to correct the deformation error of large structural parts

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