Radial inspection of bolt blanks, comparison test block, CD ultrasonic test block

NegotiableUpdate on 05/07

Model

Nature of the Manufacturer: Producers

Product Category

Place of Origin

Online Consult

Overview

This type of test block is designed according to the requirements of the standard for ultrasonic testing of steel bolt blanks for pressure equipment, and is suitable for phased array ultrasonic testing methods and quality grading of carbon steel and low-alloy steel bolt blanks for pressure equipment with a diameter greater than or equal to M36. When the curvature radius of the bolt blank is less than 100mm, the shape and size of the test block should be compared using the curved surface shown in the following chart.

Product Details

test methodSelect a suitable test block based on the thickness of the test specimen and standard requirements. Place the calibrated twin crystal straight probe at position a in the schematic diagram, and move the probe back, forth, left, and right to obtain the maximum reflected echo of the direct sound beam on the φ 2 flat bottom hole. Adjust the echo amplitude to 80% of the full screen height and record the dB value at this time,This is the first pointPlace the probe at position b in the schematic diagram, and move the probe back, forth, left, and right to obtain the maximum reflected echo of the direct sound beam on the φ 2 flat bottom hole. Adjust the echo amplitude to 80% of the full screen height and record the dB value at this time,This is the second pointPlace the probe at position c in the schematic diagram, and move the probe back, forth, left, and right to obtain the maximum reflected echo of the direct sound beam on the φ 2 flat bottom hole. Adjust the echo amplitude to 80% of the full screen height and record the dB value at this time,This is the third pointRepeat this process until the range can cover the detection thickness (at least three points should be tested), and connect the above points into a curve, which is the distance amplitude curve of the twin crystal straight probe, and use it as the reference sensitivity. On this basis, a gain of 6dB is used as the scanning sensitivity.