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GB/T 34018-2017 (GB/T34018-2017)

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GB/T 34018-2017: PDF in English (GBT 34018-2017)
GB/T 34108-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 19.100
J 04
Non-destructive Testing –
Test Method for Scanning Ultrasonic Microscopy
ISSUED ON. JULY 12, 2017
IMPLEMENTED ON. FEBRUARY 1, 2018
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.
3. No action is required - Full-copy of this standard will be automatically &
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Table of Contents
Foreword ... 3 
1 Application Scope ... 4 
2 Normative References ... 4 
3 Terms and Definitions ... 4 
4 Personnel Qualification ... 4 
5 Method Summary ... 5 
6 Testing System ... 6 
7 Test Procedures ... 7 
8 Testing and Recording ... 9 
9 Test Report ... 9 
Non-destructive Testing –
Test Method for Scanning Ultrasonic Microscopy
1 Application Scope
This Standard specifies the method for non-destructive testing of materials or
components using ultrasonic microscopy.
This Standard applies to the testing of nano- and micron-scale defects inside all kinds
of metals and non-metallic solid materials and electronic packaging materials.
2 Normative References
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition dated applies to this document. For
undated references, the latest edition of the referenced documents (including all
amendments) applies to This Standard.
GB/T 9445, Non-destructive Testing – Qualification and Certification of NDT
Personnel
GB/T 12604.1, Non-destructive Testing – Terminology – Terms Used in Ultrasonic
Testing
GB/T 20737, Non-destructive Testing – General Terms and Definitions
GB 23912, Non-destructive Testing – Practice for Immersed Ultrasonic Testing by
the Reflection Method Using Pulsed Longitudinal Waves
3 Terms and Definitions
For the purposes of this document, the terms and definitions defined in GB/T 12604.1
and GB/T 20737 apply.
4 Personnel Qualification
The personnel who conduct testing in accordance with this Standard, shall be
appraised and certified for their qualification as specified in GB/T 9445 or a system
agreed to by all parties to contract, and they shall be trained for their jobs and
authorized for the operation by the employer or its agent.
Under a certain fixed distance, adjust the angle between the transducer and the
surface of the test block to make sure the amplitude of the reflection echoes on the
surface of the samples is the maximum and the axis of the acoustic beam of the
transducer is perpendicular to the surface of the samples.
Under the A scanning display mode, make the acoustic beam focus on the test surface
for imaging by adjusting the height of the transducer, i.e. moving the Z-axis of the
coordinate system of the scanning device.
7.2 Placement of test pieces
Place the test piece in the coupling agent to make the surface of the test piece parallel
to the plane of the scanning movement of the microscope, and remove the bubbles on
the surface of the test piece and the surface of the transducer.
7.3 Scanning parameter setting
7.3.1 Setting of scanning origin and scanning range
Maintain the height of the transducer, move the transducer along the negative direction
of the scanning axis and set the position where the echo signals of the upper surface
of the test piece have just disappeared as the scanning origin. Then move the
transducer along the positive axis of the scanning axis (the echo signals will first
augments to the maximum and then disappear gradually), and set the position where
the echo signals have just disappeared as the scanning end. The distance from the
scanning origin to the scanning end is the scanning length. Use the same method to
set the scanning origin and scanning length of the stepping axis.
7.3.2 Setting of interval of scanning points
The lateral resolution of the scanning image is subjected to the focusing characteristics
of the acoustic beam of the transducer and the interval of the sampling points during
scanning. Consideration shall be given to the diameter of the acoustic beam focus of
the transducer (the diameter of the acoustic beam refers to the minimum width of the
acoustic beam measured by the transducer at the effective testing distance using the
- 6 dB method ) for the interval of scanning points. The interval of the sampling points
of the scanning axis and the stepping interval of the stepping axis shall be set in
accordance with the principle that the interval between two adjacent scanning points
shall not be greater than ½ of the diameter of the focus of the acoustic beam of the
transducer.
7.3.3 Setting of scanning speed
In order for the ultraspeed data acquisition unit to record the echo signals completely,
the scanning movement time within the interval of the sampling points shall be greater
than the transmission time of the echoes of the test plane. During the actual setting of
scanning speed, make appropriate allowances and consider the factors such as the
additional time of the data processing of the ultraspeed data acquisition unit.
......
 
(Above excerpt was released on 2017-11-17, modified on 2021-06-07, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/GBT34018-2017