Correction method of inner arc probe or outer arc probe in ultrasonic flaw detector

Abstract

The invention discloses a correction method of an inner arc probe or an outer arc probe in an ultrasonic flaw detector, in particular to an instrument correction method by using an ultrasonic flaw detector, an inner arc probe or an outer arc probe which is used in the ultrasonic flaw detector. The correction method comprises the following steps of: cutting a block on a workpiece to be detected asa probe-connecting test block; respectively drilling two holes in different distances on the test block; searching the two holes back and forth by using the inner arc probe until the highest reflection echoes of the two holes are displaced on the ultrasonic flaw detector; respectively acquiring the distances from an ultrasonic wave emitting end in the probe to the two holes; measuring an arc length from the foremost border of the probe to the normal line of the two holes; and respectively acquiring a sound path a, a probe front border b and a probe K value in the inner arc probe or the outer arc probe according to a mathematical model. The invention fills in gaps of the test block and the correction method for acquiring a connection K value, a valve a and a valve b of the inner arc probe or the outer arc probe in the ultrasonic flaw detector, shortens the manufacture period, reduces the manufacture cost of the test block, improves the service rates of the probes and prolongs the life cycles of the probes.

Description

technical field [0001] The invention relates to an instrument calibration method, in particular to a method for calibrating inner and outer arc probes of an ultrasonic flaw detector. Background technique [0002] At present, when the ultrasonic flaw detector uses inner and outer arc probes to detect, there is only one kind of "lip-shaped test block" used to measure the front edge b of the probe, but there is no way to measure the K value of the probe and the distance a traveled by the ultrasonic wave inside the probe. To make an accurate judgment, you can only make a rough calculation based on the K value provided by the probe manufacturer and the distance a that the ultrasonic wave travels inside the probe. However, the actual K value and a of the probe often have a little deviation from the manufactured value. In addition to the loss of the probe during use, the K value and a will change accordingly, but the user cannot judge and calibrate. When the probe is worn to a cert...

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Problems solved by technology

[0002] At present, when the ultrasonic flaw detector uses inner and outer arc probes to detect, there is only one kind of "lip-shaped test block" used to measure the front edge b of the probe, but there is no way to measure the K value of the probe and the distance a traveled by the ultrasonic wave inside the probe. To make an accurate judgment, you can only make a rough calculation based on the K value provided by the probe manufacturer and the distance a that the ultrasonic wave travels inside the probe. However, the actual K value and a of the probe often have a little deviation from the manufactured value. In addition to the loss of the probe during use, the K value and a will change accordingly, but the user cannot judge and calibrate. When the probe is worn to a certain extent, the location of the defect will deviate, and the user can only replace the probe. will increase the cost of the user

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