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Demagnetizing method and device of the spring welding pipe

A technology of degaussing device and spiral welded pipe, which is applied in the direction of magnetic objects, electrical components, circuits, etc., can solve the problems of magnetic field recovery, poor degaussing effect, and less investment, and achieve the effect of simple structure, good social benefits, and improved economic benefits

Inactive Publication Date: 2007-08-15
JIANGSU TONGYU STEEL PIPE GRP
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AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method and device for degaussing spiral welded pipes, which solves the problem of degaussing by using a large DC welding power supply to degauss the steel pipe with a flexible cable or by using an AC welding power supply to demagnetize the steel pipe. The degaussing effect of the method is poor and the magnetic field of the steel pipe is still insufficient to recover after a period of time, so that the steel pipe can be effectively demagnetized with simple equipment, less investment and simple control, and the rebound of the residual magnetism of the steel pipe can be prevented. , so that the residual magnetic field of the steel pipe is controlled below 10Gs, which greatly improves the quality of the spiral welded pipe and meets the needs of relevant standards and engineering construction

Method used

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  • Demagnetizing method and device of the spring welding pipe

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Embodiment Construction

[0012] The present invention is further described in conjunction with the accompanying drawings and embodiments. The method of the present invention is to install a degaussing device on the bridge of the spiral welded pipe production line to perform rough degaussing, and then to install a degaussing device at the entrance of the welded pipe in the X-ray industrial TV flaw detection room to perform fine degaussing; the welded pipe The positive current direction of the coil L in the degaussing device installed on the production line bridge is opposite to the rotation direction of the spiral welded pipe; the positive current direction of the coil L in the degaussing device installed in the X-ray industrial TV flaw detection room is opposite to the demagnetizing current direction of the coil L on the bridge.

[0013] The device of the present invention is composed of a degaussing transformer BK, a contact voltage regulator TD, a bridge rectifier VD1-VD4 and a coil L. The primary sid...

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Abstract

The related degaussing method for spiral weld pipe mainly applies magnetic field with reverse direction to magnetic field generating welding current to take coarse degaussing and fine degaussing. Besides, the relative equipment comprises a degaussing transformer, a contact voltage regulator, a bridge rectifier, and a coil. The residual magnetic field is less 10Gs. This invention has well both economic and social benefits.

Description

technical field [0001] The invention relates to a method and device for degaussing a spiral welded pipe, belonging to the technical field of spiral welded pipe manufacturing. Background technique [0002] Spiral seam submerged arc welded steel pipe is referred to as spiral welded pipe, which is widely used in my country's petroleum, chemical, natural gas, urban heating, water delivery and other industries, especially in recent years. Upward trend. [0003] The raw material of the spiral welded pipe is hot-rolled steel strip, which is a typical material with ferromagnetic properties. During the steel pipe manufacturing process, the magnetic field of the current will magnetize the steel pipe when the weld seam is welded. After the steel pipe is cut, the magnetic domain in the steel pipe can rotate locally. exhibits strong residual magnetism. The existence of residual magnetism has two effects on the spiral welded pipe: First, it causes the distortion of the pipe end image of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F13/00B21C37/12
Inventor 尹广卿方晓东鞠平顺韩太升陶恒朝
Owner JIANGSU TONGYU STEEL PIPE GRP
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