Flange flatness correction method after welding of tower drum flange

A flange welding and flatness technology, which is applied in the correction field, can solve the problems of flatness out-of-tolerance, low accuracy of pyrotechnic correction, and high cost, so as to ensure the correction effect, improve the correction efficiency, and reduce the production cost.

Inactive Publication Date: 2016-09-07
FUJIAN FUCHUAN YIFAN NEW ENERGY EQUIP MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, although the flatness of the flange can also be corrected, the accuracy of pyrotechnic correction is low, and it often takes multiple pyrotechnic corrections to meet the corresponding flatness requirements.
Another existing mature technology is to reserve a certain thickness of machining allowance on the flange surface. After the flange is welded and welded, the flatness of the flange is out of tolerance. The flange flatness is guaranteed by milling the flange end face, but the cost of this solution is high. ,low efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A method for correcting the flatness of a flange after the flange of a tower is welded, the specific correcting steps are as follows:

[0019] After cooling the welding position between the tower flange and the tower (in this example, the wall thickness of the tower is 40mm), use the Easy Laser laser measuring instrument to measure the flatness of the flange; according to the measurement report of the flange leveling instrument, measure the Make a mark on the arc section where the value is out of tolerance; then use a baking gun to carry out flame correction on the tower tube in the band-shaped area where the distance from the outer side of the circular seam corresponding to the mark position to the weld fusion line is greater than 50mm, and the temperature of the flame correction is 600~650°C, the length of the flame rectification arc is consistent with the length of the flange out-of-tolerance arc;

[0020] According to the wall thickness of the tower tube, the distan...

Embodiment 2

[0028] A method for correcting the flatness of a flange after the flange of a tower is welded, the specific correcting steps are as follows:

[0029] After cooling the welding position between the tower flange and the tower (in this example, the wall thickness of the tower is 25mm), use the Easy Laser laser measuring instrument to measure the flatness of the flange; according to the measurement report of the flange leveling instrument, measure the Make a mark on the arc section where the value is out of tolerance; then use a baking gun to carry out flame correction on the tower tube in the band-shaped area where the distance from the outer side of the circular seam corresponding to the mark position to the weld fusion line is greater than 50mm, and the temperature of the flame correction is 600~650°C, the length of the flame rectification arc is consistent with the length of the flange out-of-tolerance arc;

[0030] According to the wall thickness of the tower tube, the distan...

Embodiment 3

[0038] A method for correcting the flatness of a flange after the flange of a tower is welded, the specific correcting steps are as follows:

[0039] After cooling the welding position between the tower flange and the tower (in this example, the wall thickness of the tower is 15mm), use the Easy Laser laser measuring instrument to measure the flatness of the flange; according to the measurement report of the flange leveling instrument, measure the Make a mark on the arc section where the value is out of tolerance; then use a baking gun to carry out flame correction on the tower tube in the band-shaped area where the distance from the outer side of the circular seam corresponding to the mark position to the weld fusion line is greater than 50mm, and the temperature of the flame correction is 600~650°C, the length of the flame rectification arc is consistent with the length of the flange out-of-tolerance arc;

[0040] According to the wall thickness of the tower tube, the distan...

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PUM

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Abstract

The invention discloses a flange flatness correction method after welding of a tower drum flange. The specific correction steps include: measuring the flatness of a flange using an Easy Laser measuring instrument after a welding position of a tower drum flange and a tower drum is cooled; according to a measurement report of a flange leveling instrument, making a mark on an arc segment with a deviated flange measurement value; and then conducting, by using a baking gun, flame straightening for the tower drum in a strip-shaped region which corresponds to the marked position and in which a distance from the outer side of a circular seam to a weld-fusion line is greater than 50mm, the flame straightening arc length remaining consistent with the flange deviated arc segment length. In the correction method, explicit requirements are proposed for the nature of the flame and the distance from the flame to a workpiece, meanwhile, a plurality of tests and studies are conducted on the influence of various fire work parameters on the fire work quality, the various fire work parameters are set according to corresponding study and test results, the flatness of the flange is corrected twice at most according to the correction method, and the flatness of the flange can be ensured to met corresponding production requirements.

Description

technical field [0001] The invention relates to a correction method, in particular to a method for correcting the flatness of a flange after the flange of a tower tube is welded. Background technique [0002] In recent years, green energy has been widely used in various fields because of its renewable and clean characteristics, among which wind power is an excellent green energy. As the infrastructure of wind power generation, the tower tube must strictly control the welding deformation during the welding process with the flange, and the flange is required to be inclined inside and flat outside. At present, after the welding of the tower tube and the flange is completed, after the welding position is cooled, it is necessary to use corresponding instruments and equipment to measure the flatness of the flange, and then perform pyrotechnic correction on the position where the measured value is out of tolerance. In the usual pyrotechnic rectification process, there are clear re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K5/00B23K5/18
CPCB23K5/006B23K5/18
Inventor 王磊沈伟吴斌勇
Owner FUJIAN FUCHUAN YIFAN NEW ENERGY EQUIP MFG CO LTD
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