Special test block and method for measuring combined horizontal linearity of transverse wave angle probe and digital ultrasonic flaw detector

Abstract

The invention relates to a special test block and method for measuring combined horizontal linearity of a transverse wave angle probe and a digital ultrasonic flaw detector. The special test block comprises a test block base body, a detection block I, a detection block II, a detection block III and a detection block IV; the detection block I, the detection block II, the detection block III and the detection block IV are all in the shape of a straight triangular prism with a right triangle-shaped bottom surface, are embedded in the test block base body, so as to form a cube with a square cross section; the side surfaces on which the bevel edges of the bottom triangles in the four straight triangular prisms of the detection block I, the detection block II, the detection block III and the detection block IV are positioned are respectively positioned on four side surfaces of the cube formed by the detection block I, the detection block II, the detection block III, the detection block IV and the test block base body and are flush with one another. The special test block provided by the invention is compact and small in structure, light and easy to carry, and can be simultaneously suitable for measurement of four common K-value transverse wave angle probes for weld flaw detection.

Description

technical field [0001] The invention relates to the technical field of ultrasonic flaw detection, in particular to a special test block and a method for measuring the horizontal linearity of a combination of a shear wave oblique probe and a digital ultrasonic flaw detector. Background technique [0002] Combined horizontal linearity means that after the ultrasonic probe is connected to the ultrasonic flaw detector, the actual time interval between the multiple reflection echoes obtained by the ultrasonic waves emitted by the probe on a certain reflective surface of the test block (or workpiece) and the time measured by the ultrasonic flaw detector The numerical deviation of the interval and the degree of proportionality. Combined horizontal linearity directly affects the positioning accuracy of flaws in the flaw detection process. Therefore, there are strict regulations on combined horizontal linearity in various flaw detection technical regulations. For example, NBT47013.3 ...

AI Technical Summary

Problems solved by technology

[0004] Considering that the inspection of pipeline welds often uses shear-wave angled probes, existing methods are fundamentally deficient

In addition, the existing combined horizontal linearity measurement formula is given by the analog circuit type ultrasonic flaw detector, but at present, digital ultrasonic flaw detectors are basically used, and some corrections to the original measurement formula are also required

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