GB/T 11363-1989 Brazing joint strength test method

This standard specifies the test methods for conventional tensile and shear of brazed joints and conventional shear of soft soldered joints. This standard is applicable to the determination of instantaneous tensile and shear strength of brazed joints of ferrous metals, non-ferrous metals and their alloys at low temperature, room temperature and high temperature, and instantaneous shear strength of soft soldered joints at low temperature, room temperature and high temperature. GB/T 11363-1989 Brazed joint strength test method GB/T11363-1989 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Methods of the strength tests for brazed and soldered joint
Subject content and scope of application
GB11363—89
This standard specifies the test methods for conventional tensile and shear of brazed joints and the test methods for conventional shear of soft soldered joints. This standard is applicable to the determination of the instantaneous tensile and shear strength of brazed joints of ferrous metals, non-ferrous metals and their alloys at low temperature, room temperature and high temperature, and the instantaneous shear strength of soft soldered joints at low temperature, room temperature and high temperature. 2 Preparation of test plates, tests and specimens
2.1 Test plates, test rods and test dimensions
The dimensions of the test plates, test rods and specimens machined after brazing for tensile tests are shown in Figure 1. The dimensions of the test plates for shear tests and the specimens after brazing are shown in Figure 2. According to the test requirements, any of the specimen forms can be selected. Note: ① For plate specimens used in high temperature instantaneous tensile tests, a pin hole can be drilled at the tensile clamp. ② For heavy metal tests, the size of the test plate (rod) and the specimen can be reduced accordingly if the test conditions are met. State Technical Supervision Bureau approved on May 8, 1989 GB11363-89 z'1×ziw GB11363-89 Test plate and specimen for No. 1 test piece on January 1, 1990
GB11363-89
Test plate and specimen for No. 5 test piece
c. Test plate and specimen for No. 6 test piece
Test plate before brazing
Figure 2 Shear test plate and brazing specimen
2.2 Test plate and test bar materials and processing requirements
2.2.1 The test material should be the metal material of the component used. Brazing seam (gap C)
Brazing (interval C)
Fiber (gaps C)
Test specimen after brazing
2.2.2 Select the test specimen form of Figure 1 or Figure 2 according to the test purpose, and process it according to the dimensions shown in the figure. The plate test piece should be flat. 2.2.3 The brazing end face of the tensile test plate and test rod should be at right angles to the tensile direction, and the pin welding surface of the No. 6 test plate should be perpendicular to the clamping surface. 2.2.4 The burrs and burrs after processing should be completely removed. Unit: mm
2.2.5 The brazing surface can be polished in a certain direction with No. 400 silicon carbide sandpaper. In special applications, the surface state should be equivalent to the requirements of the actual component.
2.2.6 The brazing surface and its surroundings should be cleaned by appropriate methods to remove impurities such as oil and oxides. 3 Brazing filler metal, flux and shielding gas
3.1 The type of brazing filler metal used in the test shall be selected according to the actual component needs. Its shape and size are not specified. The surface of the brazing filler metal shall be cleaned by appropriate methods, and the amount of brazing filler metal shall be sufficient to fill the gap after melting. 3.2 If brazing filler metal and shielding gas must be used, the test requirements shall be met. 3.3 When using brazing filler metal, it shall be pre-coated on the entire brazing surface before brazing. 4 Assembly and brazing
4.1 Assembly
4.1.1 In order to avoid the displacement of the test piece during brazing, appropriate fixtures or spot welding shall be used for positioning. 4.1.2 The brazing gap C can be selected between 0.02 and 0.3 mm according to the properties of the base material and the brazing filler metal, or determined according to the actual component needs; during assembly, the gap of the brazing part shall be uniform and consistent; when a comparative test is required, the same gap shall be selected and the actual assembly gap value shall be recorded. 4.1.3 The lap lengths F1, F2, and F3 of the shear test specimen are determined by the properties of the parent material, the brazing filler metal, and the purpose of the test. 4.2 Heating brazing
4.2.1 There is no restriction on the heating method. The device for overall heating should ensure that the test piece is heated uniformly as a whole. The device should be equipped with a photometric measurement system; non-integral heating (such as flame, induction heating) must ensure that the brazing temperature is evenly reached within 40 to 60 seconds within a range of 10 mm on both sides of the joint.
4.2:2 The brazing temperature is the liquidus temperature of the brazing filler metal plus 30 to 50 °C. The upper limit temperature can be relaxed in special cases. 4.2.3 At the brazing temperature, after the brazing filler metal is completely melted, the holding time is selected to be 10 to 40 seconds depending on the brazing method. 4.2.4 The brazing material can be placed in the brazing position before brazing, or the brazing material with brazing flux can be manually fed after the base material is heated to the brazing temperature (self-brazing brazing material does not need to be coated with brazing flux).
4.2.5 Avoid rapid cooling of the test piece after brazing.
4.2.6 No deformation correction or heat treatment is required for the test piece after brazing. 5 Sample processing
5.1 The number of brazing test pieces under the same conditions shall be at least three per group. 5.2 The tensile test piece shall be processed according to Figure 1, and the brazing surface shall be perpendicular to the length direction of the test piece. Avoid applying loads that deform the joint during processing. 5.3 The excess brazing material outside the fillet and brazing seam of the shear test piece shall be removed, and care shall be taken to avoid damaging the test piece during removal. 6 Test method
6.1 Measurement of brazing area
6.1.1 When measuring the brazing area of ​​the tensile test piece, the width or diameter of the joint shall be accurate to 0.1 mm. 6.1.2 Measure the joint width and lap length of the shear specimen, and take the average value of the measured values ​​at the two end positions, accurate to 0.1mm. 6.2 During the comparative test, the loading speed and displacement speed of the instantaneous tensile or shear test should be consistent. Low-temperature instantaneous tensile and shear tests should be carried out at the specified temperature. High-temperature instantaneous tensile and shear specimens should be placed on a tensile machine equipped with a heating furnace for loading. Before loading, the specimens should be kept warm at the test temperature for half an hour, and the allowable error of the furnace temperature is ≤ ±3°C.
Avoid artificial eccentric loads on the brazed joint when loading. The fracture surface should be inspected and the results recorded in the report. If serious density defects are found (defects exceed 20% of the fracture area of ​​the brazing seam), the test results are invalid.
6.3 Strength calculation
6.3.1 The tensile strength of the brazed joint is calculated by formula (1): g
Where: α——joint tensile strength, N/mm\; P——joint failure load, N, bZxz.net
A——brazing area before failure, mm.
Note: A of specimen No. 1 = brazing seam width (B) x plate thickness (t) (a is the brazing seam diameter).
A of specimens No. 2 and 3
6.3.2 The shear strength of the brazed joint is calculated by formula (2): Where: T——joint shear strength, N/mm2, P——joint failure load, N;
A——brazing area before failure, mm2.
（2）
GB11363--89
Note: A of No. 4 specimen = specimen width (B) x lap length (F1); A of No. 5 specimen = specimen width (B) x lap length (F2) x 2; A of No. 6 specimen = plate thickness (t) x lap length (Fs). Record content
Test name, test number, test purpose, test conditions, specimen form; parent material brand or composition and use conditions: solder brand composition, shape, injection, protective gas composition and dosage, assembly gap, specimen clamping form hole
Heating method and heating device, brazing temperature and holding time at brazing temperature, total heating time: brazing area;
Loading speed and displacement speed, failure load, tensile or shear test strength, average tensile or shear strength; failure section state.
Additional instructions:
This standard is proposed by the Ministry of Machinery and Electronics Industry. This standard is under the jurisdiction of Harbin Welding Research Institute. This standard was drafted by Harbin Institute of Technology. The main drafters of this standard are Fan Fuhua and Qian Yiyu.
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