GB/T 31932-2015 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 31932-2015 | English | 85 |
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Method for electromagnetic automatic ultrasonic testing for thicker steel plates
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GB/T 31932-2015: Method for electromagnetic automatic ultrasonic testing for thicker steel plates---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/GBT31932-2015
GB
NATIONAL STANDARD OF THE
PEOPLE'S REPUBLIC OF CHINA
ICS 77.040.20
H 26
Method for electromagnetic automatic
ultrasonic testing for thicker steel plates
Issued on: SEPTEMBER 11, 2015
Implemented on: JUNE 1, 2016
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 4
4 General requirements ... 5
5 Comparative sample ... 5
6 Testing equipment ... 6
7 Testing methods ... 6
8 Testing records and defect evaluation ... 8
9 Steel plate quality grade ... 8
10 Testing reports ... 9
Appendix A (Informative) Comparative sample production ... 10
Foreword
This Standard was drafted in accordance with the rules specified in GB/T 1.1-
2009.
This Standard was proposed by China Iron and Steel Association.
This Standard shall be under the jurisdiction of the National Steel
Standardization Technical Committee (SAC/TC 183).
The drafting organizations of this Standard. Hunan Valin Xiangtan Iron & Steel
Co., Ltd., China Electronics Technology Information Industry Co., Ltd.,
Metallurgical Industry Information Standards Institute.
The main drafters of this Standard. Cao Zhiqiang, Yuan Renping, Qian
Hongliang, Dong Li, Chen Peiying, Li Xiaoli, Liu Yingqing, Yan Chongqiang,
Zhang Weixu.
Method for electromagnetic automatic
ultrasonic testing for thicker steel plates
1 Scope
This Standard specifies the terms and definitions, general requirements,
comparative samples, testing equipment, testing method, testing record and
defect evaluation, steel plate grade, and inspection report, etc., of
electromagnetic automatic ultrasonic testing for thicker steel plates.
This Standard applies to the electromagnetic automatic ultrasonic testing for
6mm thickness below boiler, pressure vessels, bridges, construction,
shipbuilding, pipelines, steel mold and other steel plates. The steel plate of
other specifications can make reference to this Standard.
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 2970 Thicker steel plate – Method for ultrasonic inspection
GB/T 9445 Non-destructive testing – Qualification and certification of NED
personnel
GB/T 12604.1 Non-destructive testing – Terminology – Terms used in
ultrasonic testing
GB/T 20935.1 Method of electromagnetic acoustic inspection for metal
materials – Part 1. Standard guide for electromagnetic acoustic transducers
(EMATs)
3 Terms and definitions
The terms and definitions which are defined in GB/T 12604.1 and GB/T 20935.1
apply to this document.
or parallel with the steel plate rolling direction. It shall ensure 100% scanning of
the entire steel plate surface.
7.2 Testing rate
During electromagnetic ultrasonic defect testing, the testing rate shall not
exceed 2m/s.
7.3 Testing sensitivity
7.3.1 The testing sensitivity of electromagnetic automatic ultrasonic defect
testing equipment can be calibrated by electronic technology, OR otherwise by
comparative sample.
7.3.2 When using electronic technology for calibration, the sensitivity of the
testing system shall be set by the first bottom wave of the testing steel plate’s
flawless location based on the probe’s large flat probe DGS curve, probe 5mm
flat bottom hole DGS curve, OR diameter 5mm flat bottom hole DAC curve;
AND meanwhile the diameter 5mm flat bottom hole DGS curve or DAC curve
is set as alarm threshold. The probe’s DGS curve can be provided by the probe
manufacturer, whilst the DAC curve shall be subject to actual measurement by
the comparative samples having different depth and diameter 5mm flat bottom
holes.
7.3.3 When using the comparative sample for calibration, one method is at the
comparative sample’s flawless location, ADJUST the first reflected wave height
to 50% of the full scale, then INCREASE the dB difference (actual
measurement) between the comparative sample’s first reflected wave and the
diameter 5mm flat bottom hole wave, which is used as the testing sensitivity;
the other method is at the comparative sample, ADJUST the 3mm flat groove
reflected wave height to 50% of full scale, then DECREASE the dB difference
(actual measurement) between the 3mm flat bottom groove and the diameter
5mm flat bottom hole wave, which is used as the testing sensitivity.
7.4 Calibration
7.4.1 The electromagnetic automatic ultrasonic defect testing equipment shall
be regularly calibrated.
7.4.2 During the continuous operation of equipment, at least every 8h, USE the
comparative sample to calibrate the testing sensitivity. As compared with the
standard result, if the variance of the testing result is not less than 10%, it shall
adjust the testing system, so as to make its performance reach to the specified
requirements; it shall also re-conduct the defect testing for the tested steel plate
after the previous calibration.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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