This standard specifies the sampling methods for tensile, impact, bending, flattening, hardness and spot welding shear tests of metal material welded joints. This standard is applicable to fusion welding and pressure welding welded joints. GB 2649-1989 Sampling methods for mechanical properties tests of welded joints GB2649-1989 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Methods of sampling for mechanical properties tests of welded joints Subject content and scope of application
GB 2$48-89
Replaces GB2649-81
This standard specifies the sampling methods for tensile, impact, bending, flattening, hardness and spot welding shear tests of metal material welded joints. This standard applies to welded joints of fusion welding and pressure welding. 2 Terminology
Test plate: Plate (including profiles and pipes) used to weld test pieces. Sample: Rough sample cut from the test piece. 3 Preparation of test pieces
3.1 The cutting direction of the test plate shall comply with the relevant product manufacturing specifications or metallurgical product standards. 3.2 The test plate material, welding material, welding conditions, and preheating and post-weld heat treatment specifications, etc., shall be the same as the relevant standards or product manufacturing specifications, or comply with the relevant test conditions. 8.3 The size of the test piece shall be comprehensively considered based on the size, quantity, incision width, machining allowance and unusable sections (such as arc starting and arc ending of arc welding). The length of the unusable section is related to the thickness of the test piece and the welding process, but shall not be less than 25mm (except for welding with arc starting plate, arc ending plate and pipe fittings). 3.4 When cutting the test piece from the test piece, if the relevant standards or product manufacturing specifications do not specify otherwise, the test piece is allowed to be straightened. 3.5 The angular deviation or misalignment of the test piece shall comply with the requirements of the relevant standards or product manufacturing specifications. 3.6 The test piece may be marked by any method, but it must be clear and the marked part shall be outside the test part. 4 The direction and number of cutting of the test piece
4.1 When cutting the test piece from the test piece, mechanical cutting should be used as much as possible. The test piece can also be cut by shearing machine, thermal cutting and other methods, but the machining allowance should be considered. In any case, it must be ensured that the metal of the test part is not in the cutting influence area. When hot cutting is used, the distance from the cutting surface to the edge of the specimen for steel shall not be less than 8mm, and shall increase as the cutting speed decreases and the cutting thickness increases. 4.2 The orientation of sample cutting for various test methods shall comply with the following provisions. 4.2.1 The orientation of sample cutting for weld and deposited metal tensile and weld joint impact is shown in Table 1, Table 2 and Table 3. 4.2.1.1 Unless otherwise specified, the orientation of sample cutting for multi-layer welds shall be as close as possible to the surface layer on the rear weld side of the weld, except for the bottom weld. 4.2.1.2 When the thickness of the test piece is greater than 100mm or the weld thickness H is greater than 60mm, the orientation of sample cutting shall be implemented in accordance with the product regulations. Approved by the State Bureau of Technical Supervision on May 8, 1989 and implemented on January 1, 1900
Test piece thickness
Note: s-
Test piece thickness
Welding seam corner edge
>16 ~ 36
Welding method
Arc welding
·or gas welding
Arc welding
or gas welding
Test piece thickness.
Welding method
Arc welding
Gas welding or
Arc welding
Gas welding or
Arc welding
Electroslag welding
GB 2649-—89
Table 1 Cutting orientation of deposited metal tensile specimen
Table 2 Cutting orientation of weld metal tensile specimen
Applicable when the welding material and the test plate are of the same material
Two transition layers should be welded on the groove surface,
and their thickness should be greater than 3 mm. Applicable
When the welding material and the test plate are not of the same material
The sample is located in the center of the welding chain
C is not greater than
the thickness of the test piece
>36~60
>36 ~60
Note, 5
Welding method
Arc welding
Electroslag welding
Arc welding
Test piece thicknessbzxz.net
The distance from the weld surface to the center of the sample; The diameter of the sample end:
H—the weld thickness on the side of the rear weld.
GB 26 49 -89
Continued Table 2
Orientation for taking impact specimens of welded joints
Test piece thickness
Welding method
Pressure welding
Arc welding
Or gas welding
c' is not greater than
C' is not greater than
C' is not greater than
Test piece thickness
>16 ～ 40
>40 ～ 60
>60 ～ 100
Welding method
Pressure welding
Arc welding
Electroslag welding
Arc welding
Electroslag welding
Electroslag welding
GB 2649—89
Continued Table 3
C=1～3
C=1～3
Test piece thickness
H = 18 ～ 40
H >40 ~ 60
Welding method
Distance from weld surface to specimen center: Specimen end diameter:
-Test piece thickness:
GB 2649 89
Continued Table 3
C-Distance from specimen thickness surface to specimen edge, H
-Weld thickness on the last welding side.
4.2.2 The orientation of the tensile specimen for welded joints is shown in Table 4.
C±1～3
In principle, the specimen is taken from the full thickness of the specimen. If the thickness of the specimen exceeds 30mm, it shall be cut according to the diagram in Table 4, and the specimen shall cover the full thickness of the specimen.
Table 4 Orientation for cutting tensile specimens for welded joints
Test piece thickness
Test piece category
Butt joints of all welding methods
Note: S——Test piece thickness:
Test piece thickness,
b——Test piece width.
GB 2649-89
4.2.8 Orientation for cutting bending specimens for welded joints is shown in Table 5. 4.2.3.1 In principle, the transverse bending specimen is taken from the full thickness of the specimen. If the thickness of the specimen exceeds 20mm, it shall be cut according to the diagram in Table 5, and the specimen shall cover the full thickness of the specimen.
Test piece thickness
Note, s-
Test piece category
Butt joints for all welding methods
Test piece thickness:
Sample thickness,
Sample width.
Table 5 Orientation for cutting bend samples of welded joints
4.2.8.2 The width of the side bend sample shall be the thickness of the test piece. If the thickness of the test piece exceeds 40mm, it shall be cut according to the diagram in Table 5, and the sample shall cover the full thickness of the test piece.
4.8 Unless otherwise specified in the relevant standards or product manufacturing specifications, the number of samples for various test methods: joint stretching shall not be less than 1. Deposited metal and weld metal stretching shall not be less than 1 each. Entire pipe joint stretching shall be 1. Pipe joint strip stretching shall not be less than 2. Forward bend, back bend and side bend shall not be less than 1 each. Longitudinal bend shall not be less than 2. The impact of the joint is not less than 3. The shear resistance of the spot welding joint is not less than 5. The flattening of the pipe joint is not less than 1. The hardness of the joint and the surfacing is not less than 1. 4.4 The location of the shear failure of the spot welding joint is shown in Figure 1. oolGtolorotoloofo
The location of the shear failure of the spot welding joint
GB2649-89
The hardness samples of the welding joint and the surfacing metal are respectively cut perpendicular to the weld axis and the corresponding sections along the length direction of the surfacing. 4.5
4.6 The location of the sample failure is reasonably arranged within the effective utilization length of the specimen according to the coal seam shape of the specimen and the non-destructive testing results. 4.7 The location of the sample failure of the flattened pipe joint is carried out according to Figure 2 (a) and (b). Single
Additional instructions:
Longitudinal seam flattening
Circumferential seam fanning
Figure 2 Pipe joint flattening sample bad cutting position
This standard is 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 is 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. 19
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