This standard specifies the Charpy impact test method for welded joints of metal materials and the determination of the impact absorption energy of the specimen. This standard is applicable to fusion welded and pressure welded butt joints. GB 2650-1989 Impact test method for welded joints GB2650-1989 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Method of impact test for welded joints
Method of impact test for welded joints Subject content and scope of application
GB 2650—89
Replaces GB2650—81
This standard specifies the Charpy impact test method for welded joints of metal materials to determine the impact absorption energy of the specimen. This standard applies to fusion welded and pressure welded butt joints. Reference standards
GB2649 Sampling method for mechanical property test of welded joints GB2106
Metal Charpy (V-notch) impact test method Metal Charpy (U-notch) impact test method GB 229
GB4159
Metal low-temperature Charpy impact test method
3 Specimens and their preparation
3.1 This standard specifies that the specimen with a size of 10mm×10mm×55mm and a V-notch is the standard specimen. The size and deviation of the specimen shall comply with the requirements of Figure 1. The bottom of the specimen notch shall be smooth and shall not have obvious scratches parallel to the notch axis. When conducting arbitration tests, the roughness of the bottom of the specimen notch shall be less than R, 0.8um. Approved by the State Administration of Technical Supervision on 1989-05-08 20
1990-01-01 implementation
27.5±0, 3
GB 2650-89
10 ±0.05
S0'0+8
R0.25±0.025
22.5°±122.5°±1
Figure 1 V-notch specimen
According to the technical conditions, auxiliary specimens with U-notch are allowed. The size deviation of the specimens shall comply with the provisions of Figure A1 in Appendix A
According to the technical conditions or when it is impossible to cut standard specimens, auxiliary small-size specimens are allowed, see Figures B1 and B2 in Appendix B.
3.2 The specimens shall be prepared by machining or grinding, and strain hardening of the machined surface or overheating of the material shall be prevented. 3.3 The marking of the specimen should not affect the support of the specimen by the support, nor should it cause work hardening near the notch. Generally, the marking should be on the end face, side face or back face of the notch of the specimen within 15mm from the end face, but it should not be marked on the supporting surface. 3.4 If defects such as pores, slag inclusions, cracks, etc. are found at the notch of the specimen, the specimen cannot be used for testing. 4. Sample cutting and orientation of sample notch
The preparation of the specimen and the cutting of the sample shall comply with the provisions of GB2649. 4.1
4.2 The notch of the specimen can be opened in the weld, fusion line or heat affected zone according to the test requirements. 4.3 The notch axis of the specimen shall be perpendicular to the weld surface, as shown in Figure 2. 2
GB2650-89
Axis of notch of specimen
Weld surface
Impact specimen
Figure 2 Schematic diagram of notch direction of specimen
4.4 The notch positions of the weld, fusion line and heat affected zone of the specimen are shown in Figures 3, 4 and 5 respectively. The distance 1 between the notch axis and the fusion line in the heat affected zone is specified by the product technical conditions. Figure 3 Notch position in weld
Figure 4 Notch position in fusion line
Figure 5 Notch position in heat affected zone
The distance from the notch axis of the specimen to the intersection of the longitudinal axis of the specimen and the fusion line. Note: "
GB 2650—89
4.5 Before notching, the specimen shall be corroded, and after the weld is clearly shown, the marking shall be carried out as required. 5 Test and result recording
5.1 The testing machine and test requirements shall comply with the relevant provisions of GB2106 and GB229. 5.2 The low-temperature impact test shall be carried out in accordance with the relevant provisions of GB4159. 5.3 According to the requirements of the technical conditions used, the test results can be expressed in terms of impact absorption energy or impact toughness value. When a V-notch specimen is used, it shall be expressed in terms of Ak or ak, and when a U-notch specimen is used, it shall be expressed in terms of Aku or aku. 5.4 The test report shall record the following:
The type of specimen and the orientation of the notch,
The test temperature,bzxz.net
The impact absorption energy or impact toughness value of the specimen when it is broken, and the types of defects found on the fracture.
The test results shall be evaluated according to the relevant standards or product technical conditions. 5.5
27.5 ± 0. 31
GB 2650 -89
Appendix A
U-notch auxiliary test specimen
(Supplement)
U-notch test specimen
Appendix B
Auxiliary test specimen
(Supplement)
90~0+8
R1 ±0.07
Auxiliary small size test specimens are shown in Figure B1 and Figure B2. The dimensional deviations not specified in the figures shall comply with the provisions of Article 3.1 and Figure A1 of this standard. 24
Additional Notes:
This standard is proposed by the Ministry of Machinery and Electronics Industry. GB 2650—89
S0*0干8
900 ± 8
V-type small size test specimen
S0:0+8
50*0±8
U-type small size test specimen
This standard is under the jurisdiction of Harbin Welding Research Institute of the Ministry of Machinery and Electronics Industry. 90*0+0
7.5±0.05
S0*0+0
7.5±0.05
S0*00m
This standard was drafted by Harbin Welding Research Institute of the Ministry of Machinery and Electronics Industry and Heilongjiang Import and Export Commodity Inspection Bureau. The drafters of this standard are Wang Wan, Tang Shouli and Shao Songmao. 25
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