GB/T 2655-1989 Test method for strain aging sensitivity of welded joints

GB/T 2655-1989 Test method for strain aging sensitivity of welded joints GB/T2655-1989 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Test method of strain aging sensitivity for welded jointsMethod of strain aging sensitivity for welded joints
Subject content and scope of application
GB 2655--8
Replaces GB2655-81
This standard specifies the test method for determining the strain aging sensitivity of welded joints of metallic materials by multiple ratio impact test. This standard is applicable to fusion welded butt joints.
2 Referenced standards
GB2650 Impact test method for welded joints
GB4160 Test method for strain aging sensitivity for steel3 Sample cutting and specimen preparationbzxz.net
: 3.1 The sample can be cut by any method, but the determination of the results should be avoided by avoiding changes in the properties of the material due to work hardening or heating. 3.2 For joints with a thickness greater than or equal to 12 mm, the dimensions of the tensile specimen are shown in Figure 1. For joints with a thickness greater than or equal to 6 mm and less than 12 mm, the dimensions of the tensile specimen are shown in Figure 2, and the weld surface should be retained.
- The length of the clamping part of the specimen is determined by the structure of the testing machine. L- The length of the tested part Approved by the State Administration of Technical Supervision on May 8, 1989 2-16
>6 -12
1990-01-01 Implementation
GB 2655-B9
3.8 The specimen is cut transversely from the tensile specimen of the joint along the weld. The type and size of the specimen, the preparation of the specimen, and the orientation of the specimen notch shall all comply with the provisions of GB2650.
4 Test
4.1 Generally, tensile strain should be used to stretch the joint specimen with a width greater than 60 mm and a test part length not less than 100 mm. The residual strain of general low carbon steel should be 10%, and that of low alloy steel should be 5%, with a deviation of 0.5%. It can also be carried out in accordance with the relevant product standards or the provisions of the agreement between the two parties.
4.2 The strained samples shall be artificially aged in accordance with the provisions of GB4160. 4.8 The aging treatment methods (residual strain, heating temperature, holding time, cooling conditions) for other metal or alloy joints other than general steel shall be specified by the corresponding technical conditions. 5 Results and records
5.1 According to the requirements of the relevant technical conditions, the test results can be used to determine the strain aging impact absorption work Aks, the strain aging impact toughness value are or the strain aging sensitivity coefficient C.
For the test results obtained from the √-notch impact specimen, the strain aging impact absorption work is represented by Ak, the strain aging impact toughness value is represented by akv, and the strain aging sensitivity coefficient is represented by C. For the test results obtained from the U-notch impact specimen, Ar, arus, and Cu shall be used accordingly. 5.2 The test results shall be evaluated according to the corresponding standards or product technical conditions. 5.8 The test report shall record the following contents:
a. Strain aging impact absorption energy or strain aging impact toughness value, strain aging sensitivity coefficient and impact absorption energy without strain aging state,
b. Type of specimen and orientation of notch,
c. Residual strain,
d. Type of defects found on the fracture.
Additional remarks:
This standard was proposed by the Ministry of Machinery and Electronics Industry. This standard is under the jurisdiction of Harbin Welding Research Institute of the Ministry of Machinery and Electronics Industry. 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.
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