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GB/T 38980-2020: Test method for artificial defect sizes of zirconium tube flaw detection comparison samples Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
Similar standardsGB/T 38980-2020: Test method for artificial defect sizes of zirconium tube flaw detection comparison samples---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT38980-2020 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.040.99 H 21 Test Method for Artificial Defect Sizes of Zirconium Tube Flaw Detection Comparison Samples ISSUED ON: JULY 21, 2020 IMPLEMENTED ON: JUNE 1, 2021 Issued by: State Administration for Market Regulation; Standardization Administration of the People’s Republic of China. Table of ContentsForeword ... 3 1 Scope ... 4 2 Normative References ... 4 3 Principle ... 4 4 Selection of Methods ... 5 5 Replication Measurement Method ... 5 6 Microscopic Measurement Method ... 5 7 Data Processing ... 7 8 Test Report ... 8 Test Method for Artificial Defect Sizes of Zirconium Tube Flaw Detection Comparison Samples1 ScopeThis Standard specifies the replication and microscopic measurement method of the sizes of artificial defects (artificial grooves / through holes) of comparison specimens for the flaw detection of zirconium tubes. This Standard is applicable to the measurement of the sizes of artificial grooves / through holes on the comparison specimens for the non-destructive testing of zirconium tube ultrasound and eddy current, etc. The measurement of the sizes of similar artificial defects on other metal comparison specimens may take this as a reference.2 Normative ReferencesThe following documents are indispensable to the application of this document. In terms of references with a specified date, only versions with a specified date are applicable to this document. In terms of references without a specified date, the latest version (including all the modifications) is applicable to this document. GB/T 8170 Rules of Rounding off for Numerical Values & Expression and Judgement of Limiting Values YB/T 145 Die Casting and Size Measurement Method of Artificial Defects on the Reference Sample Pipes3 Principle3.1 Replication Measurement Method Replication measurement method is an indirection measurement method. By filling the plastic material in the artificial defect and taking it out after solidification forming, the three-dimensional appearance of the artificial defect is intuitively, vividly and realistically reproduced. Take points, lines and sections; adopt measuring tools of corresponding precisions to measure the length, width and depth of the artificial defect; obtain the size data of the artificial defect. 3.2 Microscopic Measurement Method a high magnification to focus on the specimen. Adjust the stage and the specimen, so that the artificial defect is in the center of the field of view. Adjust the measurement equipment, so that the plane of measurement can clearly focus; select the measurement point. 6.3.1.4 The magnification for the measurement of the length and width of the artificial groove is not lower than 100 ; the magnification for the measurement of the depth is not lower than 200 ; the magnification for the measurement of the through hole is not lower than 100 . 6.3.2 Measurement of artificial groove 6.3.2.1 Measurement of length and width: on the length or width boundary of the artificial groove, determine the measurement point and perform the aiming reading. In accordance with the relative displacement of the X or Y coordinates between the points on the two boundaries in the length or width direction, calculate the length or width value. The length measurement of transverse flaw shall be corrected in accordance with the measured chord length. 6.3.2.2 Measurement of depth: on the surface and the bottom of the opening of the artificial groove, respectively perform focus reading. In accordance with the relative displacement of the Z coordinate during two focusing, calculate the depth value. 6.3.3 Measurement of through hole On the circumference of the through hole, randomly choose three points. Through the coordinates of the three points, calculate the diameter of the circle.7 Data Processing7.1 Replication Measurement Method For the depth and width of each artificial defect, the maximum value of the cross- sectional dissection measurement results taken from three points in the length direction of the replication sample is taken as the measurement result; the length is measured with a Vernier caliper. The measurement data shall be rounded off in accordance with the stipulations of GB/T 8170. 7.2 Microscopic Measurement Method For the measurement of the artificial grooves, the measurement of the sizes of each artificial defect shall at least measure three points. The principle of point selection is: respectively one point near the two ends and the middle position; repeat the measurement for 3 times at each point and take the average value; the maximum value of the three points is used as the measurement result. For the measurement of through holes, each through hole shall be measured for 3 times on the circumference (the ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB/T 38980-2020 be delivered?Answer: The full copy PDF of English version of GB/T 38980-2020 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB/T 38980-2020_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 38980-2020_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. 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