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GB/T 41856.1-2022 English PDF (GBT41856.1-2022)

GB/T 41856.1-2022 English PDF (GBT41856.1-2022)

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GB/T 41856.1-2022: Non-destructive testing - Industrial endoscopy visual testing - Part 1: Method
GB/T 41856.1-2022
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 19.100
CCS J 04
Non-destructive testing - Industrial endoscopy visual testing
- Part 1: Method
ISSUED ON: OCTOBER 12, 2022
IMPLEMENTED ON: OCTOBER 12, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3
Introduction ... 5
1 Scope ... 6
2 Normative references ... 6
3 Terms and definitions ... 6
4 Method principle ... 6
5 Environmental requirements ... 7
6 Personnel requirements ... 7
7 Testing system ... 7
8 Testing ... 10
9 Result evaluation ... 12
10 Testing report ... 13
Appendix A (Informative) Comparison of structure and performance of three
types of endoscopy testing systems ... 14
Appendix B (Informative) Endoscopy measurement methods ... 16
Non-destructive testing - Industrial endoscopy visual testing
- Part 1: Method
1 Scope
This document specifies the method principle, environmental requirements, personnel
requirements, testing system, testing, result evaluation, and testing report of industrial
endoscopy (hereinafter referred to as endoscopy) visual testing.
This document is applicable to the testing and evaluation of the inner surface state and
internal structure of metal or non-metal parts and assembly components of industrial
products.
2 Normative references
The contents of the following documents, through normative references in this text,
constitute indispensable provisions of this document. Among them, for dated references,
only the edition corresponding to that date applies to this document. For undated
references, the latest edition (including all amendments) applies to this document.
GB/T 9445 Non-destructive testing - Qualification and certification of NDT
personnel
GB/T 20737 Non-destructive testing - General terms and definitions
GB/T 41856.2 Non-destructive testing - Industrial endoscopy visual testing - Part 2:
Atlas
3 Terms and definitions
The terms and definitions defined in GB/T 20737 apply to this document.
4 Method principle
Without damaging the tested part or the operation of in-service equipment, for the parts
or inner surface conditions that are difficult to be observed by direct visual testing,
endoscopy visual testing uses an endoscopy testing system to test and evaluate them by
means of optical images or photoelectric conversion video images. By changing
different endoscopy probes (also known as scope bodies); changing the viewing
direction or improving the field of view; and applying optical or photoelectric principles,
FIND defects clearly, intuitively and effectively. Compare the measured image with the
typical atlas; analyze and evaluate the real situation of the tested area or structure.
5 Environmental requirements
5.1 The ambient temperature and humidity of the testing site shall meet the
requirements of the testing system.
5.2 There shall be no electromagnetic interference affecting the testing around the
testing site.
5.3 The endoscopy testing system should have its own grounding protection power
supply or be grounded independently. It shall be equipped with a voltage stabilizing
device, to ensure that there is no static electricity accumulation during the working
process. The grounding resistance should not be greater than 4 Ω.
5.4 When testing, it is advisable to avoid strong light or direct sunlight; choose a soft
and quiet environment.
6 Personnel requirements
The personnel, who carry out the testing, shall be subject to qualification and
certification according to GB/T 9445 or the system recognized by the parties to the
contract; it shall obtain relevant qualification certificates for visual testing. Or the
employer shall provide job training and operation authorization for them.
7 Testing system
7.1 Composition
7.1.1 The basic configuration of the endoscopy testing system is mainly composed of
endoscopy probe, lighting source, control system, and display system.
7.1.2 Auxiliary functions such as manipulator, image recording transmission system,
and video converter can be configured.
7.2 Classification
Endoscopy testing systems are classified according to imaging principles and light
guide materials as follows.
a) Optical straight-rod endoscopy (rigid scope or straight-rod scope). Use the
principle of optical imaging. Use the objective lens to generate the image signal.
Use a medium to transmit the image. Use the eyepiece to directly observe. It can
7.4 Lighting source
7.4.1 In order to ensure the testing resolution ability of the endoscopy AND truly reflect
the state of the inner surface of the tested part, a white light illumination source should
be used.
7.4.2 According to the material and inner surface state of the tested part, adjust the
illumination and the depth of field and angle of the endoscopy probe, to avoid reflection
and glare.
7.5 Control system
The endoscopy testing system should have the function of adjusting focus and
illumination. There are automatic and manual adjustments.
7.6 Display system
7.6.1 The resolution of the display system should not be lower than that of the
endoscopy testing system.
7.6.2 The imaging quality of the endoscopy testing system should be tested using a
resolution test card, to judge the imaging clarity, resolution, barrel-shaped distortion,
color distortion, etc.
7.7 Measurement mode
The measurement mode of the endoscopy testing system is divided into two types:
comparative measurement and absolute measurement. According to the testing
requirements of the tested part, select a measurement mode. See Appendix B.
7.8 Testing software
The testing software should have functions such as image freeze-frame photography,
video recording, zoom-in, comparison, etc.; and can perform color setting, brightness
adjustment, file naming, image storage and recall, video/video playback, deletion,
formatting, lighting color white balance, etc.
7.9 Auxiliary functions
Fiber optic or electronic video endoscopy shall have the following auxiliary functions
- such as tool auxiliary channels and externally attached auxiliary tools, etc. - for
operations such as foreign objects grasping, deburring, chamfering, diversion, and
cleaning.
When grasping foreign objects, according to the material and shape of the excess
objects, auxiliary grasping tools can be selected. The length is generally longer than the
length of the insertion tube of endoscopy probe. When grabbing excess objects, it is
advisable to avoid the auxiliary tools from scratching the surface of the tested part.
When the grasping tool enters the working channel of the endoscopy, it shall be in a
straightened and tightened state to facilitate grasping.
If burrs are found in the inner hole and inner cavity OR chamfering is required, the
endoscopic electric grinding device with built-in tool channel can be selected for visual
operation.
8 Testing
8.1 Testing preparation
8.1.1 Before testing, it is advisable to remove impurities and corrosive objects on the
surface of the tested part; remove redundant objects that affect the testing and evaluation;
so as to ensure the true state of the surface of the tested part.
8.1.2 According to the internal structure characteristics of the inspected part and the
testing requirements, select the model and specification of the endoscopy probe.
According to the testing steps, unfold and ...
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