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Non-destructive testing of welds -- Ultrasonic testing -- Acceptance levels
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Standard ID | GB/T 29712-2023 (GB/T29712-2023) | Description (Translated English) | Non-destructive testing of welds -- Ultrasonic testing -- Acceptance levels | Sector / Industry | National Standard (Recommended) | Classification of Chinese Standard | J33 | Classification of International Standard | 25.160.40 | Word Count Estimation | 22,299 | Date of Issue | 2023-11-27 | Date of Implementation | 2024-06-01 | Older Standard (superseded by this standard) | GB/T 29712-2013 | Drafting Organization | Shanghai Materials Research Institute, China Special Equipment Testing Research Institute, Jiangsu Fangtian Electric Power Technology Co., Ltd., State Grid Zhejiang Electric Power Co., Ltd. Electric Power Research Institute, Shanghai Survey and Design Institute Co., Ltd., Shandong Ruixiang Mold Co., Ltd., Wuhan University, Jiangsu Provincial Special Equipment Safety Supervision and Inspection Institute, Harbin Welding Research Institute Co., Ltd., Zhimide Co., Ltd. | Administrative Organization | National Welding Standardization Technical Committee (SAC/TC 55) | Proposing organization | China Machinery Industry Federation | Issuing agency(ies) | State Administration for Market Regulation, National Standardization Administration | Standard ID | GB/T 29712-2013 (GB/T29712-2013) | Description (Translated English) | Non-destructive testing of welds. Ultrasonic testing. Acceptance levels | Sector / Industry | National Standard (Recommended) | Classification of Chinese Standard | J33 | Classification of International Standard | 25.160.40 | Word Count Estimation | 16,183 | Quoted Standard | GB/T 11345; GB/T 19418; GB/T 29711 | Adopted Standard | ISO 11666-2010, MOD | Drafting Organization | Shanghai Research Institute of Materials | Administrative Organization | National Welding Standardization Technical Committee | Regulation (derived from) | National Standards Bulletin No. 19 of 2013 | Proposing organization | National Welding Standardization Technical Committee (SAC/TC 55) | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | Summary | This standard specifies the full penetration ferritic ultrasonic testing of welded joints - Acceptance levels 2 and 3. Acceptance of this standard grade 2 and 3, respectively, corresponding to GB/T in the 19418 B-and C-class weld quality requirements. Bec |
GB/T 29712-2023
GB
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 Contents
Foreword ... 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 ... 22
Foreword
This 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.
Non-Destructive Testing of Welds – Ultrasonic Testing –
Acceptance Levels
1 Scope
This 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.
These acceptance levels are applicable to testing carried out in accordance with ISO 17640.
This Document applies to the testing of full penetration ferritic steel welds, with thicknesses
from 8 mm to 100 mm. It can also be used for other types of welds, materials and thicknesses,
provided the tests have been performed with necessary consideration of the geometry and
acoustic properties of the component, and an adequate sensitivity can be employed to enable
the acceptance levels of this document to be applied. The nominal frequency of probes used in
this document is between 2 MHz and 5 MHz, unless attenuation or requirements for higher
resolution call for other frequencies. It is important to consider the use of these acceptance
levels in conjunction with frequencies outside this range carefully.
2 Normative References
The 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 – Vocabulary
NOTE: GB/T 12604.1-2020 Non-destructive testing – Terminology - Ultrasonic testing (ISO 5577:2017,
MOD)
ISO 5817:2014 Welding - Fusion-welded joints in steel, nickel, titanium and their alloys (beam
welding excluded) - Quality levels for imperfections
ISO 17635 Non-destructive testing of welds — General rules for metallic materials
using straight-beam scanning with longitudinal waves.
For techniques 1 (side-drilled holes) and 3 (rectangular notch), see Figures A.1 to A.4.
For techniques 2 [flat-bottomed holes (disk-shaped reflectors)] and 4 (tandem technique), see
Figures A.5 to A.10.
Any discontinuities providing an amplitude below the acceptance level but with a length (above
evaluation level) exceeding t,
a) for the thickness range of 8 mm ≤ t < 15 mm, or
b) for t/2 or 20 mm, whichever is larger; for all other thickness ranges beyond the provisions
a).
It shall be subject to further testing. This requires the use of additional beam angle(s), and, if
specified, the tandem technique.
The final evaluation shall be based on the maximum echo amplitude and the measured length.
6.3 Indications from transverse discontinuities
When detection of transverse discontinuities is specified, the acceptance levels stated in 6.2
apply.
6.4 Grouping of discontinuities
Grouping of discontinuities is based on the length and the separation of individually acceptable
discontinuities providing amplitudes above the recording level. The length of a group shall not
be used for further grouping.
For evaluation, a group of discontinuities shall be considered as a single one if:
a) the distance, dx, between two discontinuities is less than twice the length of the longer
discontinuity (see Figure 1);
b) the distance, dy, between two discontinuities is less than half of the thickness but not more
than 10 mm; and
c) the distance, dz, between two discontinuities is less than half of the thickness but not more
than 10 mm.
The combined length of the group of two discontinuities is l12=l1+l2+dx (see Figure 2).
The combined length, l12, and the larger maximum amplitude of the two discontinuities shall
then be assessed against the applicable acceptance levels given in Table A.1.
......
GB/T 29712-2013
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 25.160.40
J 33
Non-destructive testing of welds -
Ultrasonic testing - Acceptance levels
ISSUED ON. SEPTEMBER 18, 2013
IMPLEMENTED ON. JUNE 01, 2014
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Measurement of indication length ... 5
4 Sensitivity setting and levels ... 5
5 Acceptance levels ... 6
5.1 General ... 6
5.2 Longitudinal indications ... 6
5.3 Transverse indications... 7
5.4 Grouping of indications... 7
5.5 Cumulative length of acceptable indications ... 8
Appendix A (Normative) Level ... 10
Appendix B (Normative) Fixed amplitude level technique ... 22
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard, through the redrafting method, modifies and adopts the ISO
11666.2010 “Non-destructive testing of welds - Ultrasonic testing - Acceptance
levels” (English version).
As compared with ISO 11666.2010, the main technical differences of this
standard and their causes are as follows.
- Regarding the normative reference documents, in order to adapt to the
technical conditions of China, the following adjustments were made.
• USE GB/T 19418 which equivalently adopts international standard to
replace ISO 5817 (see 5.1);
• USE GB/T 11345 which equivalently adopts international standard to
replace ISO 17640 (see 1, 5.1, 5.2);
• USE GB/T 29711 which equivalently adopts international standard to
replace ISO 23279 (see 5.1);
• DELETE the ISO 17635 standard, INCLUDE its relevant content directly
to the text (see 5.1).
This standard was proposed and shall be under the jurisdiction of the National
Welding Standardization Technical Committee (SAC/TC 55).
Drafting organizations of this standard. Shanghai Materials Research Institute,
China Special Equipment Inspection and Research Institute, Jiangsu Fangtian
Power Technology Co., Ltd., Jining Ruixiang Mould Co., Ltd. (Shandong Jining
Mould Factory).
The main drafters of this standard. Ding Jie, Jin Yufei, Jiang Wei, Zhuang
Zhiqiang, Zheng Hui, Ma Junpeng, Wei Zhongrui, Wang Sen, Zhang Wenjie,
Ma Jun, Xi Lifeng.
Non-destructive testing of welds -
Ultrasonic testing - Acceptance levels
1 Scope
This standard specifies the ultrasonic acceptance level 2 and 3 for full
penetration welded joints in ferritic steels, which correspond to the quality levels
B and C welds in GB/T 19418. Since the level D welds usually do not require
ultrasonic testing in GB/T 19418, there is no ultrasonic testing acceptance level
corresponding to the quality level D weld requirements in GB/T 19418.
The acceptance levels of this standard apply to ultrasonic testing in accordance
with GB/T 11345.
This standard applies to the examination of full penetration ferritic steel welds,
with thicknesses from 8 mm to 100 mm. It can also be used for other types of
welds, materials and thicknesses above 100 mm, provided that the
examinations have been performed with necessary consideration of the
geometry and acoustic properties of the component, and an adequate
sensitivity can be employed to enable the acceptance levels of this standard to
be applied. Unless attenuation or requirements for higher resolution call for
other frequencies, the nominal frequency of probes used in this standard is
between 2M Hz and 5 MHz. The use of these acceptance levels in conjunction
with frequencies outside this range needs to be considered carefully.
2 Normative references
The following documents are essential to the application of 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) are applicable to this standard.
GB/T 11345 Non-destructive testing of welds - Ultrasonic testing -
Techniques, testing levels, and assessment (GB/T 11345-2013, ISO
17640.2010, MOD)
GB/T 19418 Arc-welded joints in steel - Guidance on quality levels for
imperfections (GB/T 19418-2003, ISO 5817.1992, IDT)
GB/T 29711 Non-destructive testing of welds - Ultrasonic testing -
Characterization of indications in welds (GB/T 29711-2013, ISO 23279.2010,
IDT)
3 Measurement of indication length
The length of an indication 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 as specified in Appendix B.
Alternative techniques for measuring indication length may be used when
specified.
4 Sensitivity setting and levels
The sensitivity setting and subsequent weld examination shall use the same
techniques. The setting of sensitivity may select one of the following techniques.
a) Side-drilled hole technology. based on a 3 mm diameter side-drilled hole;
b) Flat-bottom hole technology. distance-gain-size (DGS) curve based on
flat-bottom holes;
c) Rectangular notch technology. a distance-amplitude-corrected (DAC)
curve of a rectangular notch of 1 mm depth and 1 mm width;
d) Tandem technology. a tandem technique based on a 6 mm diameter flat-
bottom hole.
This standard uses four levels as specified in GB/T 11345.
1) Reference level;
2) Evaluation level;
3) Recording level (corresponding to two acceptance levels, the values are
all derived from the relevant acceptance level - 4 dB);
4) Acceptance level (corresponding to two quality levels).
The specifications for all levels corresponding to the reference reflector are
given in Table A.1.
The provisions for the levels are given in Appendix A.
a) t, for the plate thickness range 8 mm ≤ t ≤ 15 mm;
b) t/2 or 15 mm, whichever is greater, for the plate thickness t > 15 mm.
Further testing shall be preferred, which requires the use of probes from other
angles, as well as tandem testing (if agreed).
The final assessment shall be based on the highest echo amplitude indicated
and the measured length.
5.3 Transverse indications
When it is specified to detect the transverse indication, the acceptance level is
applied as described in 5.2.
5.4 Grouping of indications
The grouping is based on the length and the separation of the two individually
acceptable indications which have amplitudes above the recording level. The
length of a group shall not be used for further grouping.
For evaluation, a group of indications shall be considered as a single one, if.
a) The distance dx, is less than 2 times the length of the longer indication
(see Figure 1);
b) The distance dy, is less than half of the thickness of the plate but not more
than 10 mm;
c) The distance dz, is less than half of the thickness of the plate but not more
than 10 mm.
The combined length (see Figure 2) is shown in formula (1).
l12 = l1 + l2 + dx ...(1)
The combined length l12, and the larger maximum amplitude of the two
indications shall then be assessed against the applicable acceptance levels as
given in Table A.1.
......
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