Test block special for butt-jointed seam ultrasonic wave climbing flaw detection of heterogeneity steel minor diameter tube

Abstract

The invention discloses a special test block for ultrasonic creeping wave flaw detection of butt-jointed welding seams of a special steel small-diameter tube, which comprises a tool body and a tool shank, wherein the tool body comprises a tool bit, a tool back and a tool edge, the tool shank is connected to the tool back side of the tool body through a connecting body, the tool back and the tool edge of the tool body are convex arc surfaces of which the curvatures are the same as that of an outer circle of the small-diameter tube, and the side surface of the tool body is provided with three transverse through holes; the tool bit is formed by concentrically and co-directionally overlapping two concentric sectors of which the diameters have one-time difference, and one radial edge of each of the sectors is coincidently arranged with the tool back; and the thickness of the tool shank is the same as the wall thickness of the small-diameter tube, the upper and lower surfaces of the tool shank are convex and concave arc surfaces of which the curvatures are the same as those of the outer circle and an inner circle of the small-diameter tube respectively, the convex and concave arc surfaces of the tool shank are provided with straight grooves with equal-depth openings respectively, and the side surface of the tool shank is provided with two transverse through holes. The special test block has a simple and practical structure, and can accurately test parameters of a creeping wave probe, check monitoring process parameters, and be matched with a creeping wave flaw detection process to realize the ultrasonic creeping wave flaw detection of the butt-jointed welding seams of the special steel small-diameter tube.

Description

technical field [0001] The invention relates to a special test block for detection, in particular to a special tool for ultrasonic creepage wave flaw detection of butt welds of dissimilar steel small-diameter pipes: a special test block for ultrasonic creepage wave flaw detection of butt welds of dissimilar steel small-diameter pipes. Background technique [0002] For a long time, flaw detection workers at home and abroad have tried to apply ultrasonic creeping wave flaw detection to the comprehensive quality inspection of dissimilar steel small-diameter pipe butt welds to replace the backward radiographic flaw detection and penetrant flaw detection. The butt welds of small-diameter pipes are fully inspected, but there is no suitable special test block for simulating various defects to confirm the system performance of instruments and probes in the inspection test, and to calibrate the size of weld defects. At present, there are only matching test blocks for the butt weld in...

AI Technical Summary

Problems solved by technology

[0002] For a long time, flaw detection workers at home and abroad have tried to apply ultrasonic creeping wave flaw detection to the comprehensive quality inspection of dissimilar steel small-diameter pipe butt welds to replace the backward radiographic flaw detection and penetrant flaw detection. Comprehensive quality inspection of small-diameter pipe butt welds, but there is no suitable special test block for simulating various defects to cooperate with it, so as to determine the system performance of instruments and probes in the inspection test, and to calibrate the size of weld defects

At present, there are only matching test blocks for the butt weld inspection of the same material, but the function is single, the performance is poor, and it cannot be used for the overall quality inspection of the butt weld of dissimilar steel small-diameter pipes

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