Pipeline port hysteresis buffer demagnetization method and demagnetizer

Abstract

The invention discloses a pipeline port hysteresis buffer demagnetization method and a demagnetizer and relates to the technical field of pipeline systems. Demagnetization coils are wound at a port of a pipeline to be demagnetized; a giant magneto-resistance probe is fixed at an outer edge of the port of the pipeline; the giant magneto-resistance probe is connected with a data interface of a maincontroller of the demagnetizer; and the demagnetization coils are connected with a power output end of the main controller. The method comprises the following steps that: the main controller picks upa signal of the giant magneto-resistance probe and measures the size and direction of the remanence of the pipeline; according to the size and direction of the remanence of the pipeline and differences of materials, the main controller automatically calculates output parameters and controls a circuit part to convert a power frequency alternating current of 50 Hz into a high frequency alternating current of 20 to 45 kHz; and the main controller performs voltage reduction and rectification and controls a power supply to generate the size and direction of a required current so as to obtain a magnetic field of which the size is equal to that of the remanence of the pipeline and the direction is opposite to that of the remanence of the pipeline. Compared with the conventional demagnetization product, the demagnetizer has the advantages of light weight, low energy consumption, advanced control mode, reliability in operation, high demagnetization speed, good demagnetization effect and the like.

Description

technical field [0001] The invention relates to a hysteresis buffer degaussing method and a degausser for a pipeline port. It relates to the technical field of piping systems. Background technique [0002] At present, a variety of methods are used to demagnetize the pipe port: 1) Appropriately change the position of the ground wire of the weldment; 2) Properly adjust the inclination angle of the electrode, and tilt the electrode toward the blowing direction; 3) Use the segmented back welding method and the short arc welding method; 4) Use AC welding instead of DC welding; 5) Place ferromagnetic materials that generate a symmetrical magnetic field, and try to make the ferromagnetic material around the arc evenly distributed; 6) Reduce residual magnetism on the weldment; 7) Use anti-degaussing method, That is, let the weldment generate an opposite magnetic field to offset the residual magnetism on the weldment; 8) Use a welding wire with a cross-section of 35-50mm to wind on ...

AI Technical Summary

Problems solved by technology

Although the two technologies have a certain degree of degaussing, the degaussing effect is not ideal

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