GB/T 2650-2022 English PDF (GBT2650-2022)

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GB/T 2650-2022: Destructive tests on welds in metallic materials - Impact tests
GB/T 2650-2022
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 25.160.40
CCS J 33
Replacing GB/T 2650-2008
Destructive Tests on Welds in Metallic Materials – Impact Tests
(ISO 9016:2022, Destructive Tests on Welds in Metallic Materials –
Impact Tests – Test Specimen Location, Notch Orientation and
Examination, MOD)
ISSUED ON: OCTOBER 12, 2022
IMPLEMENTED ON: OCTOBER 12, 2022
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 ... 5
4 General ... 5
5 Sampling Code ... 6
5.1 Sampling code system ... 6
5.2 Characters ... 6
5.3 Additional information ... 6
6 Code Example ... 7
7 Test Procedure ... 9
8 Test Report ... 9
Appendix A (Informative) Example of Test Report ... 10
Destructive Tests on Welds in Metallic Materials – Impact Tests
1 Scope
This Document specifies the sampling code, code example, test procedure and test report for
the impact test of welded butt joints.
This Document applies to impact tests of fusion welded and pressure welded joints of metallic
materials.
This Document is a supplement to GB/T 229, including the sampling code of butt joint
specimens and additional reporting requirements.
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.
GB/T 229 Metallic materials - Charpy pendulum impact test method (GB/T 229-2020, ISO
148-1:2016, MOD)
3 Terms and Definitions
For the purposes of this Document, there are no terms and definitions apply.
4 General
The impact specimen shall be taken horizontally from the welded joint; and the longitudinal
axis of the specimen is perpendicular to the length direction of the weld. The notch location can
be determined by macroscopic erosion.
The impact test shall be carried out according to the provisions of GB/T 229. The test
temperature, sampling location, specimen type, specimen size and notch orientation shall
comply with the provisions of relevant application standards.
5 Sampling Code
5.1 Sampling code system
The sampling code system consists of letters indicating the specimen type, location and notch
direction, and numbers indicating the distance (in mm) between the notch and the reference line
RL. See Tables 1 and 2 for the sampling code representation method.
5.2 Characters
The sampling code consists of the following characters:
First character: Use "U" for Charpy U-notch; "V" for Charpy V-notch.
The second character: Use "W" to indicate that the notch is in the weld metal; at this time, the
reference line RL is the centerline of the weld on the specimen. Use "H" to indicate that the
notch is in the heat-affected zone; and at this time the reference line RL is vertical line drawn
from the intersection of the longitudinal central axis and fusion line/pressure welding bonding
line to the surface of the base metal.
Third character: Use "S" to indicate that the notched face is parallel to the surface of the
joint/test piece.
NOTE 1: The direction of the notched surface parallel to the surface of the joint/test piece is equivalent
to the meaning of "surface notch" in the fracture mechanical test.
Use "T" to indicate that the notched face is perpendicular to the surface of the joint/test piece
(the notch passes through the thickness of the joint/specimen).
The fourth character: Use "α" to indicate the distance from the axis of the notch to the reference
line (if the centerline of the notch is the centerline of the weld metal, record α=0).
The fifth character: Use "b" to indicate the distance between the surface of the joint/test piece
and the surface of the nearest side of the specimen (if the surface of the specimen is the surface
of the joint, record b=0).
NOTE 2: For X-shaped, K-shaped or similar welds, the surface of the weld is the wider side of the weld
or the side where the welding starts.
5.3 Additional information
When the above sampling codes cannot fully describe the specimen location or the notch
orientation, a schematic diagram prepared according to the welding procedure specification
should be provided.
1 – notch axis;
2 – base metal;
3 – heat affected zone;
4 – fusion line;
5 – weld metal.
Figure 1 – Typical Sampling Code Example
7 Test Procedure
The specimens marked in this Document shall be tested according to the provisions of GB/T
229.
8 Test Report
In addition to the requirements specified in GB/T 229, the test report shall also include the
following:
a) The reference number of this Document: such as GB/T 2650-2022;
b) Specimen sampling code;
c) If any, give the type and size of the observed imperfections;
d) If necessary, give a schematic diagram;
e) Other contents required by the application of standards and/or agreements.
Appendix A gives an example of a typical test report.