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4. Hardness test
Hardness and microhardness tests are widely used to characterize welded joints. There are two techniques that can be used on this type of assembly: the Brinell test and the Vickers test. Both hardness and micro-hardness tests are governed by test method standards: NF EN ISO 6506-1 and NF EN ISO 6507-1 for the Brinell and Vickers tests respectively. The Vickers method is the most widely used in welding.
The Vickers method consists in applying a diamond indenter with a pyramidal shape and square base to the area to be tested. The angle at the top of the pyramid is 136 for a given time (5 to 15 s) and under a given load (see below). Hardness is then measured by measuring the size of the indentation (diagonal measurement) left by the indenter. For this Vickers method, it is also important to differentiate between hardness and microhardness measurements. The difference...
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Hardness test
Conclusion
Bibliography
Standards and norms
- Metallic materials – Impact bending test on Charpy specimen – part 1: test method - NF EN ISO 148-1 - 01-11
- Destructive testing of welds on metallic materials – Reagents for macroscopic and microscopic examination - FD CR 12361 - 10-96
- Description and qualification of a welding procedure for metallic materials – Welding procedure qualification test – Part 1: arc and gas welding of steels and arc welding...
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