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1 Translated English of Chinese Standard: GB/T Buy True-PDF Auto-delivery. NATIONAL STANDARD OF THE PEOPLE S REPUBLIC OF CHINA GB ICS J 33 Replacing GB/T , GB/T Test method of the strength for brazed and soldered joint 钎焊接头强度试验方法 (ISO 5187:1985, Welding and allied processes - Assemblies made with soft solders and brazing filler metals - Mechanical test methods, NEQ) Issued on: May 06, 2008 Implemented on: November 01, 2008 Issued by: General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China; Standardization Administration of the People's Republic of China. Buy True-PDF Auto-delivery. Page 1 of 25

2 Table of Contents Foreword Scope Normative references Principle Terms and definitions Symbols and descriptions Samples Determination of brazing/soldering area (S0) Specimens and processing requirements Brazing filler metal/solder, brazing/soldering flux and shielding gas Assembly and brazing/soldering Test methods Expression of test results Test report Buy True-PDF Auto-delivery. Page 2 of 25

3 Foreword This Standard corresponds to ISO 5187:1985 Welding and allied processes - Assemblies made with soft solders and brazing filler metals - Mechanical test methods (English edition). The degree of conformity with ISO 5187 is not equivalent. The main differences are as follows: - ADD Clause 3 Principle, Clause 4 Terms and definitions, Clause 5 Symbols and descriptions and Plate joint sample. This Standard replaces GB/T Methods of the strength tests for brazed and soldered joint and GB/T Method of the strength test for brazed and soldered seam. Compared with GB/T and GB/T , the main changes are as follows: - The standard name is modified to Test method of the strength for brazed and soldered joint ; - ADD five clauses, i.e. Normative references, Principle, Terms and definitions, Symbols and descriptions and Determination of brazing/ soldering area (S0) ; - ADD 3 types of sample, i.e. plate samples of which the parallel part width is 10 mm, 15 mm, 30 mm (6.2.1); - ADD 4 types of sample, i.e. bar samples of which the parallel part diameter is 5 mm, 10 mm, 15 mm, 20 mm; DELETE the 8 mm sample type (6.2.2); - ADD the requirements for test machines (11.1); - USE international symbols in strength calculation equations (12.1.3, ); - DELETE the schematic diagram of oxyacetylene flame heating device (2.5.2 of GB/T 8619); - ADD the requirements of test date, test site, brazing filler metal/solder form, heat treatment state of brazed/soldered joints, test temperature, number of this Standard and test personnel in the test report record (Clause 13). This Standard was proposed by China Machinery Industry Federation. This Standard shall be under the jurisdiction of China National Standardization Technical Committee of Welding (SAC/TC 55). Drafting organizations of this Standard: Harbin Welding Institute, Shenzhen Yik Shing Tai Industrial Co., Ltd., Beijing Institute of Aeronautical Materials, State- Buy True-PDF Auto-delivery. Page 3 of 25

4 Test method of the strength for brazed and soldered joint 1 Scope This Standard specifies the conventional tensile and shear test methods for brazed/soldered joints. This Standard applies to the determination of the strength of brazed/soldered joints of metallic materials. Other structural materials such as ceramics and composites may also refer to this Standard. 2 Normative references The following documents contain the provisions which, through reference in this Standard, become the provisions of this Standard. For dated references, their subsequent amendments (excluding corrigendum) or revisions do not apply to this Standard. However, the parties who enter into agreement based on this Standard are encouraged to investigate whether the latest versions of these documents are applicable. For undated reference documents, the latest versions apply to this Standard. GB/T 228 Metallic materials - Tensile testing at ambient temperature (GB/T , eqv ISO 6892:1998) GB/T 3375 Welding terminology GB/T 8170 Rules for rounding off of numerical values GB/T (all parts) Verification of static uniaxial testing machines 3 Principle The test is to pull the sample, generally pull to fracture, to determine the tensile strength, shear strength, or creep limit of brazed/soldered joints. Unless otherwise specified, the test is generally carried out at room temperature ranging from 10 C to 35 C. For temperature-critical tests, the test temperature shall be 23 C ± 5 C. Buy True-PDF Auto-delivery. Page 5 of 25

5 4 Terms and definitions For the purpose of this Standard, the following terms and definitions and those established in GB/T 3375 and GB/T 228 apply. For convenience, some terms in GB/T 3375 and GB/T 228 are listed below. 4.1 maximum force Fm The maximum force that the sample can resist after the yield phase. For metallic materials without apparent yield (continuous yield), it is the maximum force during the test. 4.2 stress Quotient of the force at any time during the test divided by the original crosssectional area of the sample (S0). 4.3 tensile strength Rm Stress of the corresponding maximum force (Fm). 4.4 shear strength τm The maximum shear stress that the sample bears before fracture. 4.5 creep limit σ At the specified temperature, the maximum stress that makes the creep total elongation or constant creep rate of the sample not exceed the specified value in a certain period of time. Buy True-PDF Auto-delivery. Page 6 of 25

6 It shall calculate the original brazing/soldering area based on the measured original dimensions of the sample. The calculation result is expressed to four digits after the decimal point. The rules for rounding off of numerical values are in accordance with the specifications of GB/T Specimens and processing requirements 8.1 SELECT the type of specimen according to the test purpose. Under the condition of ensuring the length of the test part in the middle of the sample, the length of the sample clamping part may also be lengthened according to the test machine conditions. The plate-shaped specimen shall be flat. 8.2 The brazed/soldered end face of the tensile specimen shall be at right angles to the tensile direction. 8.3 The butting angle of the plate angle butting specimen depends on the test purpose, the base material and the type of brazing filler metal/solder r. 8.4 The brazing/soldering surface and its surroundings shall be cleaned by appropriate methods to remove oil and oxide impurities. 9 Brazing filler metal/solder, brazing/soldering flux and shielding gas 9.1 Brazing filler metal/solder The type of brazing filler metal/solder used for the test shall be selected according to the actual component. The shape and dimension are not specified, and the surface of brazing filler metal/solder shall be cleaned by appropriate methods The amount of brazing filler metal/solder shall be enough to fill up the brazing/soldering seam gap after melting. 9.2 Brazing/soldering flux and protective gas If brazing/soldering flux and protective gas are used, the requirements of the test shall be guaranteed When using brazing/soldering flux, the brazing/soldering flux shall be applied evenly before brazing/soldering, to ensure that the brazing/soldering flux flows throughout the brazing/soldering surface during brazing/soldering. Buy True-PDF Auto-delivery. Page 17 of 25

7 12 Expression of test results 12.1 Tensile test The brazing/soldering area of the plate butting sample is the width of the brazed/soldered joint multiplied by the thickness of the brazed/soldered joint The brazing/soldering area of the bar butting sample is the area of the circle with this diameter The tensile strength of brazed/soldered joints is obtained by equation (1): where Rm - the numerical value of the tensile strength of the joint, in Newtons per square millimeter (N/mm 2 ); Fm - the numerical value of the fracture load of the joint, in Newtons (N); S0 - the numerical value of the brazing/soldering area, in square millimeters (mm 2 ) OBSERVE the fracture position and RECORD it in the test report Shear test Brazing/soldering area of brazing joint samples and plate diagonally butt joint samples is brazed/soldered joint width multiplied by lapping length. The brazed area of the bar jointed sample is the brazed circumference multiplied by the socket length The shear strength of brazed/soldered joints is obtained by equation (2): where τm - the numerical value of the shear strength of the joint, in Newtons per square millimeter (N/mm 2 ); Fm - the numerical value of the fracture load of the joint, in Newtons (N); S0 - the numerical value of the brazing/soldering area before the fracture, in Buy True-PDF Auto-delivery. Page 22 of 25