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Demagnetization method for welding longitudinal joint groove of single pile foundation

A technology of monopile foundation and degaussing method, applied in magnetic objects, electrical components, circuits, etc., can solve the problems of high cost, inapplicability, complicated operation process, etc., to eliminate stress, improve stress condition, and simplify degaussing operation. effect of the process

Pending Publication Date: 2022-01-07
江苏海力海上风电装备制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a degaussing method for welding the longitudinal seam groove of a monopile foundation, to solve the problem that the current degaussing method proposed in the above-mentioned background technology has complicated operation process and high cost, and is not suitable for a small monopile basic question

Method used

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  • Demagnetization method for welding longitudinal joint groove of single pile foundation
  • Demagnetization method for welding longitudinal joint groove of single pile foundation
  • Demagnetization method for welding longitudinal joint groove of single pile foundation

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Example 1: (Taking successful trial welding as an example)

[0023] see figure 1 , a method for degaussing the longitudinal seam groove of a monopile foundation, comprising the following specific steps: first, a row of iron blocks 2 are placed under the monopile foundation longitudinal seam groove 1 with magnetism, so that the monopile foundation longitudinal seam Groove 1 can judge the strength of magnetism under the adsorption of iron block 2 (such as figure 2 shown); then remove the five-ton permanent magnet 3 on the three magnetic suction cranes, and place the five-ton permanent magnet 3 equidistantly on the two ends and the middle of the longitudinal seam groove 1 of the monopile foundation; The suction machine adjusts the position and direction of the permanent magnet 3. When the position and direction of the permanent magnet 3 are adjusted, the iron block 2 will fall, that is, the permanent magnet 3 will generate a magnetic field opposite to that of the longitu...

Embodiment 2

[0024] Example 2: (take the failure of trial welding as an example)

[0025] In this embodiment, the degaussing method of the longitudinal seam groove of the single pile foundation is consistent with that of Embodiment 1, only the trial welding is unsuccessful, that is, after the iron block 2 is dropped, the longitudinal seam groove is tested by flux-cored gas shielded welding , the phenomenon of arc magnetic deflection and a large amount of spatter still appeared after the test welding. At this time, considering whether the judgment of the magnetic field was wrong, a row of iron blocks 2 was placed under the longitudinal seam groove 1 of the monopile foundation again. If the iron blocks 2 Can not be absorbed to the longitudinal seam groove 1 of the monopile foundation, that is, the magnetic field judgment is correct, and then check whether there is any external factor at the longitudinal seam groove 1 of the monopile foundation, which should be eliminated in time. , there wil...

Embodiment 3

[0026] Example 3: (take the failure of trial welding as an example)

[0027] In this example, the degaussing method of the longitudinal seam groove of the monopile foundation is consistent with that of Example 1, and only the heat treatment process is inconsistent with the heating and degaussing of the weld, that is, when the heating temperature is higher than the 770°C Curie temperature of the steel plate of the monopile foundation , the steel plate of the single-pile foundation will become a paramagnet, so that the steel plate of the single-pile foundation has a weak response to the magnetic field, and the inductance will gradually decrease until it disappears.

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Abstract

The invention discloses a demagnetization method for welding a longitudinal joint groove of a single pile foundation, which is characterized by comprising the following five steps of: S1, judging the magnetic strength; S2, placing a permanent magnet; S3, offsetting or weakening the magnetism of the magnetic field; S4, conducting welding; and S5, carrying out postweld heat treatment. According to the invention, the strength of the magnetism of the longitudinal seam groove of the single pile foundation is judged through an iron block, then the permanent magnet taken down from an existing magnetic attraction lifting device is used for generating a magnetic field opposite to the longitudinal seam groove, the magnetism generated through the opposite magnetic field can be offset or weakened, finally, the magnetism on the longitudinal seam groove is eliminated, and therefore a high-quality welding effect is achieved; and the welding technical requirement of a small-size single-pile foundation is met, a demagnetization operation process is simplified, meanwhile, cost is reduced, and the welding construction period of the single-pile foundation is greatly shortened.

Description

technical field [0001] The invention belongs to the technical field of offshore wind power generation, and in particular relates to a degaussing method for welding a longitudinal seam bevel of a single pile foundation. Background technique [0002] Offshore wind power monopile foundations are generally made of low-alloy steel. Low-alloy steel itself has a certain degree of magnetism. Carbon planing and other processing processes will lead to the phenomenon of strengthening its magnetism, and low-alloy steel with magnetism will appear crackling during welding. The noise, arc magnetic deflection, and a large amount of spatter will be generated, and the welding cannot be completed. Even if it is barely welded, the product will be unqualified due to a large number of defects. At this stage, there are generally three degaussing methods, which are high-temperature heating, using a degaussing machine and placing an alternating magnetic field to demagnetize, but these three methods ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F13/00
CPCH01F13/003
Inventor 夏小勇钱程丁飞汤晓龙
Owner 江苏海力海上风电装备制造有限公司
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