A CSK-IA improved test block and its use method

Abstract

The present invention discloses an improved CSK-IA test block and a method for using the same, and belongs to the field of ultrasonic detection. It comprises a standard CSK-IA test block, a scale, a second stepped through hole and a plurality of flat-bottom holes. The scale is arranged on the front of the main body along the outer edge of the upper end face of the main body; the second stepped through hole is arranged on the front of the main body and passes through to the back, and is located to the lower right of the first stepped through hole, and its internal aperture gradually decreases from the front to the back along the thickness direction of the main body; and a plurality of flat-bottom holes are respectively on the front and / or lower end face of the main body. When the present invention tests the refraction angle of the oblique probe, the oblique probe with a refraction angle ≤K1.5 can use the second stepped through hole, and there is no need to flip the test block. The total time for testing the refraction angle of the oblique probe and the refraction angle is shortened by about 50%, eliminating the safety risk of flipping the test block, and there is no need to purchase and install a rotating stand.

Description

Technical Field

[0001] The invention belongs to the field of ultrasonic detection, in particular to a CSK-IA improved test block and a use method thereof. Background Art

[0002] CSK-IA test blocks are widely used in the field of ultrasonic testing. For example, they can be used to test the horizontal linearity of ultrasonic flaw detectors, estimate the blind area of ​​straight probes, test the leading edge length of angle probes, test the refraction angle (K value) of angle probes, test the sensitivity margin of angle probe detection systems, test the resolution of straight probe detection systems, and test the resolution of angle probe detection systems.

[0003] The JB / T 9214-2010 nondestructive testing standard "Test method for working performance of type A pulse reflection ultrasonic testing system" specifies the test method for the performance of ultrasonic testing systems, such as the test method for the incident point of the oblique probe and the test method for the refraction angle or K value of the oblique probe. Although the test block used is the No. 1 test block of the GB / T 19799.1-2005 standard or the CSK-IB test block of JB / T 8428-2006, which is different from the CSK-IA test block, the test methods specified in this standard are adopted by other standards, except that the test block is changed to the CSK-IA test block.

[0004] Ultrasonic testing of welds requires calibration of the probe's front length and incident point. During testing, first align the angle probe and find the maximum reflected wave on the R100 arc surface. Use a ruler to measure the distance (X1) between the front end of the angle probe and the front end of the R100 arc surface. Then, use 100-X1 to obtain the angle probe's front length (X2). When testing an angle probe with a refraction angle of 35-70°, the probe cannot be aligned with a Ø50mm hole on the same surface. Instead, the CSK-IA test block must be flipped, or a rotating stand manufactured by the manufacturer must be purchased and installed. This is more troublesome: flipping the test block poses a safety risk, and testing on a different surface is inefficient.

[0005] When ultrasonically testing plate-to-plate and pipe-to-pipe butt joints at inspection level C, the weld needs to be ground flat and defects in the weld need to be detected using a dual-crystal longitudinal wave probe or a straight probe. When testing T-welds, a dual-crystal longitudinal wave probe or a straight probe is also needed to detect cracks or lamellar tearing defects in the base material. These require flat-bottom hole test blocks with matching apertures. However, these test blocks are not integrated with the CSK-IA test blocks, and the CSK-IA test blocks alone cannot meet the testing requirements. Summary of the Invention

[0006] In order to overcome the above technical defects, the present invention provides a CSK-IA improved test block and a method of using the same to solve the problems involved in the background technology.

[0007] The present invention provides a CSK-IA improved test block and a method for using the same, comprising:

[0008] The standard CSK-IA test block includes a rectangular main body, an arc-shaped step provided on the right end surface of the main body, and a first stepped through hole provided on the front of the main body and extending through the back, with the aperture gradually decreasing from the front to the back along the thickness direction of the main body;

[0009] A graduated ruler is provided on the front side of the main body along the outer edge of the upper end surface of the main body;

[0010] a second stepped through hole, provided on the front side of the main body and extending to the back side, and located to the lower right of the first stepped through hole, wherein the internal diameter of the second stepped through hole gradually decreases from the front side to the back side along the thickness direction of the main body;

[0011] A plurality of flat-bottom holes are respectively provided on the front surface and / or the lower end surface of the main body.

[0012] Preferably or optionally, the standard CSK-IA test block complies with calibration test block No. 1 of GB / T 19799.1-2005 standard.

[0013] Preferably or optionally, the scale includes millimeter scale and / or a K value mark for testing the refraction angle of the oblique probe K≤1.5.

[0014] Preferably or optionally, the millimeter scale extends from the left end surface of the main body to the arc surface end of the circular arc step, a total of 270 mm.

[0015] Preferably or optionally, in the test K≤1.5 oblique probe refraction angle K value mark, the length of the K0.7 scale line from the left end of the main body is 184 mm, the length of the K1.0 scale line from the left end of the main body is 205 mm, and the length of the K1.5 scale line from the left end of the main body is 240 mm.

[0016] Preferably or optionally, the distance between the center of the second stepped through hole and the upper end surface of the main body is 70 mm, and the distance between the center of the second stepped through hole and the left end surface of the main body is 135 mm.

[0017] Preferably or optionally, the diameters of the second stepped through hole from the front to the back along the thickness direction of the main body are Φ50mm, Φ44mm, and Φ40mm respectively.

[0018] Preferably or optionally, the flat-bottom holes include at least 6, and the diameter of each flat-bottom hole is Ø2 mm;

[0019] At least four flat-bottom holes are arranged on the front of the main body, and the ultrasonic detection distances are 5mm, 10mm, 15mm, and 20mm respectively;

[0020] At least two flat-bottom holes are arranged on the lower end surface of the main body, which are defined as the first flat-bottom hole and the second flat-bottom hole respectively; the channel of the first flat-bottom hole or the extension line of the channel is located between the first through hole and the second through hole, and the ultrasonic detection distance of the first flat-bottom hole is 30 mm; the second flat-bottom hole passes through the center of the second stepped through hole, and the ultrasonic detection distance of the second flat-bottom hole is 40 mm.

[0021] The present invention also provides a method for using the CSK-IA improved test block, comprising the following steps:

[0022] To test the angle probe's leading edge length and incident point, connect the angle probe to the ultrasonic flaw detector with a probe cable. Turn on the ultrasonic flaw detector's power switch and select the channel for angle probe detection. Aim the probe's main sound beam at the outer arc surface of the circular step. Adjust the maximum reflected wave of the circular step's arc surface to 80% of the instrument's full height. Directly read the millimeter scale X where the angle probe's front end coincides with the scale. The K1.5 scale corresponds to the millimeter scale Y. The angle probe's leading edge length is (X-Y) mm. The point where the angle probe coincides with the K1.5 scale is the incident point of the angle probe.

[0023] Refraction angle>K1.5 For angle probe refraction angle measurement, align the main sound beam of the angle probe with the first step through hole, move the probe to find the maximum reflected wave of the Ø50mm circular hole, read the millimeter scale at the incident point of the angle probe to obtain the refraction angle value;

[0024] Refraction angle ≤ K1.5: For angle probe refraction angle measurement, align the main sound beam of the angle probe with the second stepped through hole, move the probe to find the maximum reflected wave of the Ø50mm circular hole, and read the millimeter scale at the incident point of the angle probe to obtain the refraction angle value;

[0025] Preferably or optionally, the method further comprises the following steps:

[0026] According to the thickness of the base material, select at least three flat-bottom holes with different ultrasonic detection distances that can cover the detection depth. Connect the maximum reflection waves of these flat-bottom holes into a curve, compensate for the coupling difference between the CSK-IA improved test block and the weld base material, and adjust the gain or attenuator so that the flat-bottom hole reflection wave with the lowest amplitude on the curve is at least 40% of the full height of the instrument. The curve in this state is the flaw detection sensitivity curve;

[0027] When performing ultrasonic flaw detection on site, the flaw detection sensitivity curve is increased by a predetermined decibel, and the flaw detection sensitivity is restored after the defect wave is found;

[0028] When quantifying defects, the difference between the amplitude of the flaw detection sensitivity curve at the same sound path position and the amplitude of the defect wave can be measured to obtain the equivalent size of the defect flat-bottom hole.

[0029] The present invention relates to a CSK-IA improved test block and a method for using the same, which has the following beneficial effects compared to the prior art:

[0030] 1. Ultrasonic testing of welds requires the use of a 35-70° angle probe. When testing the front length of the angle probe, no ruler is required. The position where the front end of the angle probe coincides with the scale can be obtained by visually observing it.

[0031] 2. When testing the refraction angle of the angle probe, the second-step through hole can be used for the angle probe with a refraction angle ≤K1.5. There is no need to flip the test block. The total time for testing the refraction angle of the angle probe and the refraction angle is shortened by about 50%, eliminating the safety risk of flipping the test block, and there is no need to purchase and install a rotating stand.

[0032] 3. When testing welds with a base material thickness of ≤40mm, there is no need to carry a flat-bottom hole test block. Instead, the series of flat-bottom holes with different ultrasonic detection distances in the present invention can be directly used, which is convenient for ultrasonic testing personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a front schematic diagram of the present invention.

[0034] Figure 2 It is a cross-sectional schematic diagram of the present invention.

[0035] The reference numerals are: main body 1 , arc-shaped step 2 , first stepped through hole 3 , scale 4 , second stepped through hole 5 , flat-bottomed hole 6 . DETAILED DESCRIPTION

[0036] In the following description, numerous specific details are provided to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention may be practiced without one or more of these details. In other instances, certain technical features well known in the art are not described to avoid confusion with the present invention.

[0037] See attached Figures 1 to 2 A CSK-IA improved test block includes: a standard CSK-IA test block, a scale, a second stepped through hole and multiple flat-bottom holes.

[0038] The standard CSK-IA test block conforms to the No. 1 calibration test block in the GB / T 19799.1-2005 standard. For the convenience of the following description, the structure of the standard CSK-IA test block is defined as follows: it includes a rectangular main body, a circular step on the right end surface of the main body, and a first stepped through-hole extending from the front to the back of the main body, with the aperture gradually decreasing along the thickness of the main body from the front to the back. Of course, it is understood that the standard CSK-IA test block also includes a through-hole with a diameter of 1.5 mm, a groove at the junction of the circular step and the main body, and other structures, which are not detailed here.

[0039] In this embodiment, the length of the main body is 340mm, the width is 100mm, and the thickness is 25mm; the arc-shaped step is a two-stage step, including two concentric arc surfaces, the center of which is located on the upper end surface of the main body and the distance from the left end surface of the main body is 240mm; the radius of the arc surface on the lower end surface is 100mm and the thickness is 20mm; the radius of the arc surface on the upper end surface is 50mm and the thickness is 5mm; the distance between the center of the first stepped through hole and the upper end surface of the main body is 30 mm, and a distance from the left end face of the main body is 35 mm; the distance between the center of the second stepped through hole and the upper end face of the main body is 70 mm, and a distance from the left end face of the main body is 135 mm; wherein, the structures of the first stepped through hole and the second stepped through hole are the same, and the apertures of the first stepped through hole and the second stepped through hole from the front to the back along the thickness direction of the main body are Ф50 mm, Ф44 mm, and Ф40 mm respectively, and the apertures in the thickness direction are 13 mm, 2 mm, and 10 mm respectively.

[0040] The scale is arranged on the front side of the main body along the outer edge of the upper end face of the main body; the scale includes millimeter scale and / or K value mark for testing the K≤1.5 oblique probe refraction angle. The millimeter scale scale extends from the left end face of the main body to the arc end of the circular arc step, a total of 270mm. In the K value mark for testing the K≤1.5 oblique probe refraction angle, the length of the K0.7 scale line from the left end of the main body is 184mm, the length of the K1.0 scale line from the left end of the main body is 205mm, and the length of the K1.5 scale line from the left end of the main body is 240mm. In this way, when testing the leading edge length of the 35-70° oblique probe required for ultrasonic testing of welds, a ruler is not required to match it, and the position where the front end of the oblique probe overlaps with the scale can be obtained by visually observing the position.

[0041] The second stepped through hole is arranged on the front side of the main body and passes through to the back side, and is located at the lower right side of the first stepped through hole, and its internal aperture gradually decreases from the front side to the back side along the thickness direction of the main body; wherein, the distance between the center of the second stepped through hole and the upper end face of the main body is 70 mm, and the distance from the left end face of the main body is 135 mm; wherein, the structure of the second stepped through hole is the same as that of the first stepped through hole, and the apertures of the second stepped through hole from the front side to the back side along the thickness direction of the main body are Ф50 mm, Ф44 mm, and Ф40 mm, respectively, and 13 mm, 2 mm, and 10 mm, respectively, in the thickness direction.

[0042] The flat-bottom holes are respectively on the front and / or lower end surface of the main body. In this embodiment, the flat-bottom holes include 6, and the aperture of each flat-bottom hole is Ф2mm; 4 flat-bottom holes are arranged on the front of the main body, and the ultrasonic detection distances are 5mm, 10mm, 15mm, and 20mm respectively; 2 flat-bottom holes are arranged on the lower end surface of the main body, respectively defined as the first flat-bottom hole and the second flat-bottom hole; the channel of the first flat-bottom hole or the extension line of the channel is located between the first through hole and the second through hole, and the ultrasonic detection distance of the first flat-bottom hole is 30mm; the second flat-bottom hole passes through the center of the second stepped through hole, and the ultrasonic detection distance of the second flat-bottom hole is 40mm. When testing welds with a base material thickness of ≤40mm, there is no need to carry a flat-bottom hole test block separately, and the series of flat-bottom holes with different ultrasonic detection distances in the present invention can be directly used, which is convenient for ultrasonic testing personnel.

[0043] In order to facilitate understanding of the technical solution of the CSK-IA improved test block, a brief description of its use is given below:

[0044] 1. Test the front length and incident point of the oblique probe: The inspection environment should ensure that the white light illumination is ≥500Lx. Connect the oblique probe to the ultrasonic flaw detector with a probe cable. Turn on the power switch of the ultrasonic flaw detector. Select the channel for the oblique probe detection on the digital ultrasonic flaw detector. Aim the main sound beam of the probe at the R100mm arc surface in the CSK-IA improved test block. Move the probe and adjust the gain or attenuator to adjust the maximum reflected wave of the R100mm arc surface to 80% of the full height of the instrument. Under the condition that the human eye line of sight is perpendicular to the side of the oblique probe, directly read the oblique probe. When the probe tip aligns with the scale on the CSK-IA improved test block, the millimeter scale X corresponds to the K1.5 scale, and the millimeter scale Y corresponds to the K1.5 scale. Therefore, the angle probe's leading edge length is (X - Y) mm. The point where the angle probe and the K1.5 scale overlap is the angle probe's entry point. For example, in this embodiment, let the K1.5 scale (corresponding to 240 mm on the millimeter scale) be 0 mm, and the scale at this time be 251. Therefore, the angle probe's leading edge length is 251 - 240 = 11 mm. At this point, the point where the angle probe and the K1.5 scale overlap is the angle probe's entry point. The operator should record the leading edge length test results in the performance verification record or enter them into the corresponding channel of the digital ultrasonic flaw detector for storage.

[0045] 2. Refraction angle>K1.5 Measuring the refraction angle of an angle probe: Align the main sound beam of the angle probe with the first-step through-hole. Move the probe to find the maximum reflected wave from the Ø50mm circular hole. With the human eye's line of sight perpendicular to the side of the angle probe, read the mm scale at the incident point of the angle probe and find the refraction angle value in Table 1.

[0046] Table 1: Correspondence between refraction angle>K1.5 probe mm scale and refraction angle

[0047]

[0048]

[0049] 3. Measuring the refraction angle of an angle probe with a refraction angle ≤ K1.5: Align the main sound beam of the angle probe with the second-step through-hole. Move the probe to find the maximum reflected wave from the Ø50mm circular hole. With your line of sight perpendicular to the side of the angle probe, read the mm scale at the incident point of the angle probe and find the refraction angle value in Table 2.

[0050] Table 2: Correspondence between mm scale and refraction angle of probe with refraction angle ≤K1.5

[0051]

[0052]

[0053]

[0054] 4. How to use the flat-bottom hole: Connect the probe to the ultrasonic flaw detector with a probe cable, turn on the power switch of the ultrasonic flaw detector, and select at least three Ø2mm flat-bottom holes with different ultrasonic detection distances that can cover the detection depth according to the thickness of the base material. Connect the maximum reflection waves of the above Ø2mm flat-bottom holes into a curve, compensate for the coupling difference between the test block and the weld base material, and adjust the gain or attenuator so that the reflection wave of the Ø2mm flat-bottom hole with the lowest amplitude on the curve is at least 40% of the full height of the instrument. The curve in this state is the flaw detection sensitivity curve. When performing ultrasonic flaw detection scans on site, the flaw detection sensitivity curve should be increased by 6dB, and the flaw detection sensitivity should be restored after the defect wave is found. When quantifying defects, the amplitude difference between the flaw detection sensitivity curve amplitude and the defect wave amplitude at the same sound path position can be measured to obtain the equivalent size of the defect flat-bottom hole.

[0055] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. To avoid unnecessary repetition, the present invention will not further describe various possible combinations.

Claims

1. A CSK-IA improved test block, characterized in that: include: The standard CSK-IA test block includes a rectangular main body, an arc-shaped step provided on the right end face of the main body, and a first stepped through hole provided on the front face of the main body and extending through the back face, with the aperture gradually decreasing from the front face to the back face along the thickness direction of the main body; the main body is 340 mm long, 100 mm wide, and 25 mm thick; the arc-shaped step is a two-stage step, including two concentric arc surfaces, the center of which is located on the upper end face of the main body and is 24 meters away from the left end face of the main body. 0mm; the radius of the arc surface on the lower end surface is 100mm, and the thickness is 20mm; the radius of the arc surface on the upper end surface is 50mm, and the thickness is 5mm; the distance between the center of the first stepped through hole and the upper end surface of the main body is 30mm, and the distance from the center of the first stepped through hole to the left end surface of the main body is 35mm; the apertures of the first stepped through hole along the thickness direction of the main body from the front to the back are Ø50mm, Ø44mm, and Ø40mm, respectively, and the apertures in the thickness direction are 13mm, 2mm, and 10mm, respectively; A scale is provided on the front of the main body along the outer edge of the upper end surface of the main body; the scale includes millimeter scale and a K value mark for testing the K≤1.5 angle probe refraction angle; the millimeter scale extends from the left end surface of the main body to the arc end of the circular arc step, a total of 270mm; in the K value mark for testing the K≤1.5 angle probe refraction angle, the K0.7 scale line is 184mm from the left end of the main body, the K1.0 scale line is 205mm from the left end of the main body, and the K1.5 scale line is 240mm from the left end of the main body; A second stepped through hole is provided on the front surface of the main body and extends to the back surface, and is located to the lower right of the first stepped through hole. The distance between the center of the second stepped through hole and the upper end surface of the main body is 70 mm, and the distance between the center of the second stepped through hole and the left end surface of the main body is 135 mm. The diameters of the second stepped through hole along the thickness direction of the main body from the front to the back are Ø50 mm, Ø44 mm, and Ø40 mm, respectively, and in the thickness direction are 13 mm, 2 mm, and 10 mm, respectively. Refraction angle ≤K1.5 The refraction angle measurement of the oblique probe is carried out using the second stepped through hole; A plurality of flat-bottom holes are respectively provided on the front surface and the lower end surface of the main body; The plurality of flat-bottom holes include 6, and the diameter of each flat-bottom hole is Ø2 mm; Four flat-bottom holes are arranged on the front of the main body, and the ultrasonic detection distances are 5mm, 10mm, 15mm and 20mm respectively; two flat-bottom holes are arranged on the lower end surface of the main body, defined as the first flat-bottom hole and the second flat-bottom hole respectively; the channel of the first flat-bottom hole or the extension line of the channel is located between the first stepped through hole and the second stepped through hole, and the ultrasonic detection distance of the first flat-bottom hole is 30mm; the second flat-bottom hole passes through the center of the second stepped through hole, and the ultrasonic detection distance of the second flat-bottom hole is 40mm; it is used to detect welds with a base material thickness of ≤40mm.

2. A method for using the CSK-IA improved test block according to claim 1, characterized in that: The steps include: To test the angle probe's leading edge length and incident point, connect the angle probe to the ultrasonic flaw detector with a probe cable. Turn on the ultrasonic flaw detector's power switch and select the channel to be tested with the angle probe. Aim the probe's main sound beam at the outer arc surface of the circular step. Adjust the maximum reflected wave of the circular step's arc surface to 80% of the instrument's full-scale height. Directly read the millimeter scale X where the angle probe's front end coincides with the scale. The K1.5 scale corresponds to the millimeter scale Y. The angle probe's leading edge length is (X-Y) mm. The point where the angle probe coincides with the K1.5 scale is the incident point of the angle probe. Refraction angle>K1.5 For angle probe refraction angle measurement, align the main sound beam of the angle probe with the first step through hole, move the probe to find the maximum reflected wave of the Ø50mm circular hole, read the millimeter scale at the incident point of the angle probe to obtain the refraction angle value; Refraction angle ≤ K1.5: To measure the refraction angle of an angle probe, align the main sound beam of the angle probe with the second-step through-hole, move the probe to find the maximum reflected wave from the Ф50mm circular hole, and read the millimeter scale at the incident point of the angle probe to obtain the refraction angle value.

3. The method for using the CSK-IA improved test block according to claim 2, characterized in that: The following steps are also included: According to the thickness of the base material, select at least three flat-bottom holes with different ultrasonic detection distances that can cover the detection depth. Connect the maximum reflection waves of these flat-bottom holes into a curve, compensate for the coupling difference between the CSK-IA improved test block and the weld base material, and adjust the gain or attenuator so that the flat-bottom hole reflection wave with the lowest amplitude on the curve is at least 40% of the full height of the instrument. The curve in this state is the flaw detection sensitivity curve; When performing ultrasonic flaw detection on site, the flaw detection sensitivity curve is increased by a predetermined decibel, and the flaw detection sensitivity is restored after the defect wave is found; When quantifying defects, the difference between the amplitude of the flaw detection sensitivity curve at the same sound path position and the amplitude of the defect wave can be measured to obtain the equivalent size of the defect flat-bottom hole.

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