ISO 5178:2019

ISO 5178:2019 pdf free.Destructive tests on welds in metallic materials – Longitudinal tensile test
on weld metal in fusion welded joints.
3 Terms and definitions
No terms and definitions are listed in this document.
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4 Symbols and abbreviated terms
The symbols and abbreviated terms to be used for the longitudinal tensile tests shall be as specified in ISO 6892-1.
5 Principle
An increasing tensile load is continuously applied until rupture occurs in a cylindrical test specimen taken longitudinally from the weld metal in a welded joint.
The test shall be carried out at room temperature between 10 °C and 35 °C, unless otherwise specified. Tests carried out under controlled conditions shall be made at a temperature of 23 °C±5°C.
6 Removal of test specimens
6.1 Location
The test specimen shall be taken longitudinally from the welded joint of the manufactured product or from the test piece. After machining, the parallel length of the test specimen shall consist only of weld metal (see Figures 1 and 2).
To enable correct positioning of the test specimen in the joint, the joint cross-section at both ends of the test specimen can be macroetched.
6.2 Marking
Each test piece shall be marked in order to identify its exact location in the manufactured product or in the joint from which it has been removed.
Each test specimen shall be marked in order to identify its exact location in the test piece from which it has been taken.
When removed from the test piece, each test specimen shall be marked.
6.3 Heat treatment and/or ageing
No heat treatment shall be applied to the welded joint or to the test specimen unless it is specified or permitted by the relevant application standard dealing with the welded joint to be tested. Details of any heat treatment shall be recorded in the test report. If natural ageing of aluminium alloys takes place, the time between welding and testing shall be recorded.
NOTE The presence of hydrogen in ferrous weld metals can adversely affect the test results and suitable hydrogen release treatment.
6.4 Extraction
6.4.1 General
The mechanical or thermal processes used to extract the test specimen shall not change the properties of the test specimen in any way.
6.4.2 Steel
Shearing is excluded for thicknesses greater than 8 mm. If thermal cutting or other cutting methods which can affect the cut surfaces are used to cut the test specimen from the welded plate, or from the test piece, the cuts shall be made at a distance greater than or equal to 8 mm from the surfaces of the final parallel length of the test specimen. Thermal cutting shall not be used parallel to the original surface of the welded plate or of the test piece.
6.4.3 Other metallic material
Shearing and thermal cutting are excluded and only machining (e.g. sawing and turning) shall be used.
6.5 Machining of test specimens
Unless otherwise specified in the particular application standard dealing with the welded joint under examination, the test specimens shall be taken from the centre of the weld metal as shown in Figure 1 and the cross-section as shown in Figure 2. In the case where the test specimen is not taken from midthickness, the distance from the surfaces, t1, shall be recorded Isee Figures 2 a) and b)J. In the case of very thick or double-sided welded joints, more than one test specimen may be taken at different locations through the thickness [see Figure 2 c], in which case the distances, t1 and t2, of each test specimen in the joint cross-section shall be recorded.ISO 5178 pdf download.

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