Method for calibrating small-diameter probe for ultrasonic flaw detector

Abstract

The invention discloses a method for calibrating a small-diameter probe for an ultrasonic flaw detector, belonging to the method for calibrating an instrument. The method for calibrating the small-diameter probe for the ultrasonic flaw detector comprises the following steps in sequence: manufacturing a test block for calibrating the small-diameter probe for the ultrasonic flaw detector; moving the external circular arc probe near the point O1 on the surface of the arc of the test block back and force, wherein the arc of the test block is drawn by adopting the radius R2; obtaining the range S1 of the echo of a radius R1; measuring the distance between the point O1 and the foremost edge of the small-diameter probe, wherein the distance is the front edge b of the small-diameter probe; adjusting the direction of the small-diameter probe to make the small-diameter probe aligned to the direction of the hole, and obtaining the range S of the echo of the hole; and obtaining the range a of the echo in the small-diameter probe and the value K of the small-diameter probe. The invention makes up the blank of the calibration of the value K of the small-diameter probe, the front edge b of small-diameter probe and the range a of the echo in the small-diameter probe and reduces the loss cost of the small-diameter probe.

Description

technical field [0001] The invention relates to an instrument calibration method, in particular to a method suitable for calibrating the outer circumference of cylindrical forgings, seamless steel pipes, straight seam welded pipes or shaft workpieces with a ratio of inner and outer diameters greater than 55% and an outer diameter of less than 100.0 mm. Calibration method of small diameter probe of ultrasonic flaw detector. Background technique [0002] At present, flaw detection users can only measure the front edge b of the probe and the distance a traveled by the ultrasonic wave inside the probe according to the K value provided by the probe manufacturer, and calculate the location of the defect. However, there is a certain deviation between the K value marked on the probe, the distance a between the front edge of the probe and the distance a that the ultrasonic wave travels inside the probe, and the actual value. In addition, the loss caused by the probe during use, the K...

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Problems solved by technology

However, there is a certain deviation between the K value marked on the probe, the distance a between the front edge of the probe and the distance a that the ultrasonic wave travels inside the probe, and the actual value. In addition, the loss caused by 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. When the deviation increases to a certain extent, the flaw detection user can only replace the probe, which greatly increases the cost of the user.

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