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GB/T 29712-2023: Non-destructive testing of welds - Ultrasonic testing - Acceptance levels Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 29712: Historical versions
Similar standardsGB/T 29712-2023: Non-destructive testing of welds - Ultrasonic testing - Acceptance levels---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/GBT29712-2023GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 25.160.40 CCS J 33 GB/T 29712-2023 / ISO 11666.2018 Replacing GB/T 29712-2013 Non-Destructive Testing of Welds – Ultrasonic Testing – Acceptance Levels (ISO 11666.2018, IDT) Issued on. NOVEMBER 27, 2023 Implemented on. JUNE 1, 2024 Issued by. State Administration for Market Regulation; Standardization Administration of the People’s Republic of China. Table of ContentsForeword... 3 1 Scope... 5 2 Normative References... 5 3 Terms and Definitions... 6 4 Determination of Discontinuity Length... 6 5 Sensitivity Setting and Levels... 6 6 Acceptance Levels... 7 Annex A (Normative) Levels... 11 Annex B (Normative) Fixed-Amplitude Level Technique... 22ForewordThis Document was drafted as per the rules specified in GB/T 1.1-2020 Directives for Standardization – Part 1.Rules for the Structure and Drafting of Standardizing Documents. This Document replaced GB/T 29712-2013 Non-Destructive Testing of Welds - Ultrasonic Testing - Acceptance Levels. Compared with GB/T 29712-2013, the major technical changes of this Documents are as follows besides the structural adjustments and editorial modifications. a) Change the scope (see Clause 1 of this Edition; Clause 1 of the 2013 Edition); b) Add terms and definitions (see Clause 3 of this Editon; Clause 3 of the 2013 Edition); c) Delete the provision "If otherwise specified, alternative techniques may be used to measure the display length" (see Clause 3 of the 2013 Edition); d) Change the expression of the adoption method of horizontal hole technology, the flat bottom hole technology, the rectangular slot technology, and the serial technology of the sensitivity setting and level (see Clause 5 of this Edition; Clause 4 of the 2013 Edition); e) Change the expression of the detection technology and level according to ISO 17640 in Table 1 (see 6.1 of this Edition; 5.1 of the 2013 Edition); f) Change the description of the provisions of Tables A.2 and A.3 (see 6.2 of this Edition; 5.2 of the 2013 Edition); g) Change "group display" to "discontinuous group"; and change the definition of discontinuous group (see 6.4 of this Edition; 5.4 of the 2013 Edition); h) Add the assessment requirements for single acceptable discontinuities exceeding the record level; change the definition of “cumulative length of single acceptable discontinuities exceeding the record level”; and change the acceptance criteria for the cumulative length of weld discontinuities (see 6.5 of this Edition; 5.5 of the 2013 Edition). This Document equivalently adopts ISO 11666.2018 Non-Destructive Testing of Welds – Ultrasonic Testing – Acceptance Levels. This Document made the following minimum editorial modifications. --- Add NOTE to Clause 5. Please note some contents of this Document may involve patents. The issuing agency of this Document shall not assume the responsibility to identify these patents. This Document was proposed by China Machinery Industry Federation. This Document shall be under the jurisdiction of National Technical Committee on Welding of Standardization Administration of China (SAC/TC 55). Drafting organizations of this Document. Shanghai Research Institute of Materials; China Special Equipment Inspection & Research Institute; Jiangsu Frontier Electric Technology Co., Ltd.; State Grid Zhejiang Electric Power Co., Ltd. Electric Power Research Institute; Shanghai Investigation, Design & Research Institute Co., Ltd.; Shandong Ruixiang Mould Co., Ltd.; Wuhan University; Jiangsu Province Special Equipment Safety Supervision and Inspection Institute; Harbin Welding Research Institute Co., Ltd.; and ZMD Co., Ltd. Chief drafting staffs of this Document. Sun Dan, Zheng Hui, Pan Zhixin, Zhao Zhoufeng, Liu Dongkun, Wei Zhongrui, Jiang Jiansheng, Ma Junpeng, Zhang Jun, Ma Xiangdong, Yang Qi, Wang Jiang, Zhang Xixi, Song Fei, Ma Jun, Xue Feng, Ding Jie, Wang Bing, Su Jinhua, and Zhang Zhaorui. This Document was first-time published in 2013; and it was first-time revised hereby. Non-Destructive Testing of Welds – Ultrasonic Testing – Acceptance Levels1 ScopeThis Document specifies two ultrasonic acceptance levels known as acceptance level 2 (AL 2) and acceptance level 3 (AL 3) for full penetration welded joints in ferritic steels, which correspond to ISO 5817.2014, quality levels B and C. An acceptance level corresponding to ISO 5817.2014, quality level D is not included in this document, as ultrasonic testing is generally not requested for this weld quality.2 Normative ReferencesThe provisions in following documents become the essential provisions of this Document through reference in this Document. For the dated documents, only the versions with the dates indicated are applicable to this Document; for the undated documents, only the latest version (including all the amendments) is applicable to this Document. ISO 5577 Non-destructive testing – Ultrasonic testing – Vocabulary3 Terms and DefinitionsFor the purposes of this Document, the terms and definitions given in ISO 5577 apply.4 Determination of Discontinuity LengthThe length of a discontinuity shall be determined by measuring the distance along the length over which the echo amplitude is above the evaluation level, using the fixed-amplitude level technique specified in Annex B.5 Sensitivity Setting and LevelsThe sensitivity setting shall be performed by one of the following techniques. For sensitivity setting and the subsequent testing, the same technique shall be used.6 Acceptance LevelsWhen detection of transverse discontinuities is specified, the acceptance levels stated in 6.2 apply. The length of a single acceptable discontinuity above recording level shall be evaluated according to the criteria in this subclause. The cumulative length of all individually acceptable discontinuities above recording level is given as the sum of lengths of both single discontinuities and linearly aligned discontinuities of combined length within a given section of weld length (see Figure 3). ......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 29712-2023 be delivered?Answer: The full copy PDF of English version of GB/T 29712-2023 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 29712-2023_English with my colleagues?Answer: Yes. 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