Tilted axial array circumferential eccentric eddy current probe and method for detection of small-diameter pipes

Abstract

An oblique axial array circumferential eccentric eddy current probe and method for detection of small-diameter pipes, the eddy current probe includes a cylindrical skeleton, and the cylindrical skeleton is provided with a plurality of oblique grooves arranged at equal intervals along the axial direction, and the opening of the grooves There are cylindrical parts remaining in the position, and the axis of each cylindrical part has the same eccentric distance from the axis of the cylindrical skeleton; at the same time, the angle between the line connecting the two axes and the horizontal plane is the ring of the groove The distribution angle, which makes all the grooves evenly distributed in the circumferential direction of 360°; the number of grooves is determined by the detection requirements and accuracy; it also includes mutually independent coils wound in each groove of the cylindrical skeleton; The outer diameter of the eddy current probe and the inner diameter of the small-diameter tube to be tested meet the requirements for detecting the filling rate during work; the invention also discloses the detection method of the probe; the eddy current probe only needs to scan once in the small-diameter tube to be tested to obtain Multiple information on wall defects of small diameter pipes.

Description

technical field [0001] The invention relates to an electromagnetic non-destructive testing probe, in particular to an inclined axial array circumferential eccentric eddy current probe and a method for detecting small-diameter tubes. Background technique [0002] Small-diameter pipes are widely used in various industrial fields such as energy and chemical industry. Due to the small diameter of the pipe, it is difficult to guarantee the manufacturing accuracy. After a period of service, its internal structure will inevitably suffer from damage such as macro and micro defects. Since the existence of damage will bring serious hidden dangers to the safe use of pipeline structures, it is particularly important to carry out regular inspection and evaluation. [0003] At this stage, for the detection of small-diameter tubes, the eddy current Bobbin probe detection method and the Pancake point probe scanning detection method are routinely used. These two methods are based on the ph...

AI Technical Summary

Problems solved by technology

However, for small-diameter tubes, due to the limited space in the tube, it is difficult to accommodate the traditional circumferential array probe, so there are problems of difficult design and high cost of the traditional circumferential array probe; on the other hand, due to the lack of space in the small-diameter tube The number is limited, the circumferential spatial resolution of the probe will be seriously reduced, and there is a problem of missed detection

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