GB/T 6519-2024 English PDF (GBT6519-2024)

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GB/T 6519-2024: Ultrasonic inspection of wrought aluminium and magnesium alloy products
GB/T 6519-2024
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.040.20
CCS H 26
Replacing GB/T 6519-2013
Ultrasonic inspection of wrought aluminium and magnesium
alloy products
ISSUED ON. MARCH 15, 2024
IMPLEMENTED ON. OCTOBER 01, 2024
Issued by. State Administration for Market Regulation;
National Standardization Administration.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms and definitions... 6
4 Method overview... 6
5 Inspection conditions... 7
6 Materials... 7
7 Instruments and equipment... 8
8 Sample... 14
9 Inspection... 16
10 Inspection records... 30
11 Quality assurance and control... 30
12 Inspection report... 31
Appendix A (Normative) Standard test block... 32
Appendix B (Normative) Comparison test block... 43
Appendix C (Normative) Dynamic test reference specimen... 64
Appendix D (Normative) Inspection technology, inspection documents, inspection
mode description... 66
Appendix E (Informative) Lamb wave inspection method for 1 mm ~ 6 mm thick
aluminum alloy sheet... 68
Foreword
This document was drafted in accordance with the provisions of GB/T 1.1-2020
"Directives for standardization - Part 1.Rules for the structure and drafting of
standardizing documents".
This document replaces GB/T 6519-2013 "Ultrasonic inspection of wrought aluminium
and magnesium alloy products". Compared with GB/T 6519-2013, in addition to
structural adjustments and editorial changes, the main technical changes are as follows.
a) CHANGE the method overview, indicating the factors affecting the flaw detection
results (see Chapter 4; Chapter 4 of the 2013 edition);
b) CHANGE the requirements for inspectors (see 5.1; Chapter 5 of the 2013 edition);
c) CHANGE the inspection environment requirements, clarifying the inspection
temperature (see 5.2; Chapter 6 of the 2013 edition);
d) CHANGE the materials, detailing the requirements for standard test blocks and
comparison test blocks (see Chapter 6; 7.1 of the 2013 edition);
e) ADD the requirements for dynamic test reference specimens (see 6.1.3);
f) CHANGE the probe (see 7.1; 7.2 of the 2013 edition);
g) CHANGE the ultrasonic testing instrument (see 7.2; 7.3 of the 2013 edition);
h) ADD the test mode and test method (see 9.1);
i) ADD the testing reliability verification requirements for special types of defects
(see 9.7);
j) ADD the dynamic scanning verification requirements (see 9.8);
k) CHANGE the quality acceptance level, adding the assessment requirements for
intensive defects (see 9.10; 9.2.7.2 of the 2013 edition);
l) ADD the post-test processing of samples and test marking (see 9.11);
m) ADD the quality assurance and control (see Chapter 11).
Please note that some of the contents of this document may involve patents. The issuing
agency of this document does not assume the responsibility for identifying patents.
This document was proposed by the China Nonferrous Metals Industry Association.
This document shall be under the jurisdiction of the National Technical Committee for
Ultrasonic inspection of wrought aluminium and magnesium
alloy products
1 Scope
This document describes the ultrasonic inspection method for wrought aluminum and
aluminum alloys, wrought magnesium and magnesium alloy products.
This document is applicable to ultrasonic inspection of wrought aluminum and
aluminum alloys, wrought magnesium and magnesium alloy products, using ultrasonic
pulse reflection technology.
This document is not applicable to ultrasonic inspection of castings, welded parts,
layered composites, which are produced by aluminum, magnesium and their alloys.
2 Normative references
The contents of the following documents constitute the essential terms of this document
through normative references in the text. Among them, for dated references, only the
version corresponding to that date is applicable to this document; for undated references,
the latest version (including all amendments) is applicable to this document.
GB/T 12604.1 Non-destructive testing - Terminology - Ultrasonic testing
GB/T 18694 Non-destructive testing - Ultrasonic inspection - Characterization of
search unit and sound field
GB/T 18852 Non-destructive testing - Ultrasonic testing - Reference blocks and test
procedures for the characterization of contact probe sound beams
GB/T 19799.1 Non-destructive testing - Ultrasonic testing - Specification for
calibration block No.1
GB/T 28880 Non-destructive testing - Evaluating performance characteristics of
ultrasonic pulse-echo testing systems without the use of electronic measurement
instruments
JJG 746 Verification regulation for ultrasonic flaw detectors
YS/T 874 Ultrasonic inspection of wrought aluminium alloy columniform ingots by
the water immersion method
YS/T 1187 Ultrasonic inspection of aluminium and aluminium alloy thin-walled
tubing
YS/T 1188 Ultrasonic inspection of wrought aluminium alloy ingots
YS/T 1633 Ultrasonic phased array inspection method for deformed aluminum and
aluminum alloy products
3 Terms and definitions
The terms and definitions, which are defined in GB/T 12604.1, apply to this document.
4 Method overview
The piezoelectric crystal in the probe generates ultrasonic waves under the stimulation
of electric pulses. The ultrasonic waves propagate in the sample under test through the
coupling medium. If they encounter defects (heterogeneous interfaces), they will
generate reflected waves and refracted waves, which will be received by the probe. The
piezoelectric crystal in the probe converts the ultrasonic waves into electrical signals,
which are received by the instrument for signal processing, amplification, display. The
displayed information is compared with the ultrasonic response signal of the known
ultrasonic reference reflector specified in the acceptance standard; the value and
position of the detected defects are evaluated, to assess the quality of the sample under
test.
Note 1.Due to the surface state, geometric shape, inclination of the ultrasonic beam
perpendicular to the incident surface of the sample under test, the amplitude of the defect and
the bottom reflection wave may be reduced. These factors will seriously reduce the reliability
of the test results of the ultrasonic inspection method specified in this document.
Note 2.The assessment of the defect equivalent value is affected by factors such as the
characteristics of the probe, the surface state of the defect, the nature and shape of the defect.
The comparison and assessment of the ultrasonic inspection defect test data specified in this
document with the data of the recognized ultrasonic reference reflector test is carried out under
restricted conditions; it is difficult to determine the actual size of the defect detected in the
sample under test.
Note 3.Because there are many variables in the inspection system that affect the results of
ultrasonic inspection, it is difficult to determine the actual quantitative impact of the detected
defects on the mechanical properties of the inspected samples. Although this method provides
a reliable method for quality control in product manufacturing, it is inappropriate to use it as a
special indication of the final performance and quality of the product processing workpiece
inspected in this document.
5 Inspection conditions
5.1 Inspectors
5.1.1 Ultrasonic inspectors shall pass the training and examination of the nati...