This standard specifies the test pieces, specimens, specimen size measurement, test procedures, test result processing and test reports for tensile tests on front fillet weld joints of metal materials. This standard is applicable to tensile tests on cross joint specimens and double-sided cover plate joint specimens of front fillet weld joints of metal materials to determine the tensile shear strength of front fillet welds. GB/T 15747-1995 Tensile test method for front fillet weld joints GB/T15747-1995 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Method of tension test for front fillet welded joint
Method of tension test for front fillet welded joint1 Subject content and scope of application
GB/T 15747-1995
This standard specifies the test piece, specimen, specimen size measurement, test procedure, test result processing and test report for the tension test of front fillet welded joints of metallic materials.
This standard is applicable to the tension test of cross joint specimens and double-sided cover plate joint specimens of front fillet welded joints of metallic materials, and is used to determine the tensile shear strength of front fillet welds. 2 Reference standards
Metal tensile test method
GB2649 Sampling method for mechanical property test of welded joints GB 3375
Welding terminology
Numerical value rounding rules
GB 8170
3 Terms
3.1 Front fillet welded joint A welded joint consisting of a front fillet weld. 3.2 Double strapped joint A joint formed by welding a weldment placed butt-to-butt with covers lapped on both sides. 3.3 Tensile/shear strength The stress corresponding to the maximum force on the calculated thickness section of the front fillet weld due to the combined effect of tensile stress and shear stress during the breaking process of the specimen.
4 Special
C-Tensile shear strength, N/mm2;
Thickness of cross plate of cross joint specimen or thickness of cover plate of double-sided cover plate joint specimen, mm; Thickness of longitudinal plate of cross joint specimen or thickness of core plate of double-sided cover plate joint specimen, mm; Length of cross plate of cross joint specimen, mm;
1—Length of fillet weld of specimen, mm;
Arithmetic mean lengths of two fillet welds of a broken specimen, mm; K
Weld leg size, mm;
Arithmetic mean lengths of two fillet welds of a broken specimen, mm; F. Maximum force before specimen is pulled apart, N.
Approved by the State Bureau of Technical Supervision on November 20, 1995, and implemented on August 1, 1996
5 Test pieces and specimens
5.1 Test pieces and specimens for cross joints
5.1.1 The dimensions of the test pieces for cross joints shall be in accordance with Figure 1 and Table 1.160
GB/T 15747—1995
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5.1.2 For the shape and dimensions of the test pieces without mechanical processing on the surface of the fillet weld, see Figure 2.212
GB/T15747—1995
5.1.3 For the shape and dimensions of the test pieces after mechanical processing on the surface of the fillet weld, see Figure 3.3.2
5.2 Test pieces and specimens for double-sided cover plate joints
5.2.1 For the dimensions of the test pieces for double-sided cover plate joints, see Figure 4 and Table 2. at
GB/T15747-1995
The shape and size of the test specimen without mechanical processing on the surface of the fillet weld are shown in Figure 5. A
GB/T 15747--1995
5.2.3The shape and size of the test specimen after mechanical processing on the surface of the fillet weld are shown in Figure 6.3.2www.bzxz.net
5.3 Welding of test pieces
5.3.1Before welding, the scale, paint, oil stains and other debris in the welding area of ​​the test plate should be removed and kept dry. 5.3.2Welding materials that match the strength grade of the test plate should be used, and baked and used in accordance with relevant regulations. 5.3.3The test piece should be welded according to the selected welding process parameters, and the four fillet welds should be welded in the same welding position. 5.3.4The assembly, welding and fillet weld surface quality of the test piece should comply with the provisions of Chapter 3 of GB2649 and relevant technical conditions. 5.3.5 The fillet weld shall be an equal-leg weld, and its K value shall comply with the provisions of Table 1 and Table 2. The weld legs shall be evenly hooked along the length direction. 5.3.6 According to different welding methods and test requirements, the length of the fillet weld of the test piece can be extended. 5.4 Preparation of specimens
5.4.1 The specimens shall be cut by mechanical processing or thermal cutting methods in accordance with the provisions of Chapter 4 of GB2649 and the requirements of Figures 1 and 4. When thermal cutting is used for sampling, the influence of thermal cutting on the tested part of the specimen shall be avoided. 5.4.2 The specimens shall be machined in accordance with the requirements of Figures 2, 3, 5 and 6. For specimens that need to be processed on the surface of the fillet weld, the base material shall not be damaged during processing.
6 Measurement of specimen dimensions
6.1 The fillet welds of the specimens shall be numbered according to Figure 7. 215
GB/T15747--1995
6.2 According to Article 1.70 of GB3375, measure the leg sizes of the four fillet welds from both sides of the specimen and record them according to Table 3. 6, 3 Measure the lengths of the four fillet welds and record them according to Table 3. Table 3
Fillet weld serial number
7 Test procedure
7.1 Carry out tensile test according to GB228 and determine Fb. 7.2 Two tensile test specimens shall be tested for each pair of specimens. 7.3 Observe and record the fracture position and direction of the specimen. 7.4 Check whether there are welding defects at the fracture of the specimen. 216
GB/T15747---1995
7.5 The tensile shear strength of the front fillet weld is calculated as follows: a
8 Test result processing
8.1 The result value of the tensile shear strength shall be rounded off according to the requirements of Table 6 of Article 9.1 of GB228. The rounding off method shall be implemented in accordance with the provisions of GB8170.
8.2 After the test, if the specimen breaks on the parent material, 0 is still calculated according to the formula of Article 7.5, but K and 1 in the formula are the arithmetic mean of the dimensions of the four fillet welds, and the tensile shear strength of the specimen. It is expressed as greater than the calculated value. 8.3 If any of the following conditions occur during the test, the test result shall be invalid, and the same number of specimens shall be tested again. a.
Improper operation during the test;
The specimen breaks due to defects in the parent material, the strength index is not reached, and the equipment and instruments fail during the test.
8.4 After the test, the test results should be evaluated according to the corresponding standards or technical conditions. 9
Test report
The test report should include the following contents:
This standard number;
Specimen name;
Model and specification of test plate material and welding material, welding method, welding specification, welding position, number of welding layers; arithmetic mean of the size of each fillet weld leg; tensile shear strength;
Specimen fracture position;
Type and quantity of defects appearing at the fracture of the specimen. Additional remarks:
This standard was proposed by China State Shipbuilding Corporation. This standard is under the jurisdiction of the National Welding Standardization Technical Committee. This standard was jointly drafted by China State Shipbuilding Corporation, Hudong Shipyard, Comprehensive Technical and Economic Research Institute, Dalian Shipyard and Qiuxin Shipyard.
The main drafters of this standard are Liu Zhidong, Wu Jing, An Lijun, Zhang Ruifu and Li Guiyang. 217
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