Influence of process parameters and base metal composition on hardness and toughness of low carbon steel friction stir welded joints
- Troost N.C.H. ,
- Mohandas N. ,
- Cater S. ,
- et al
- Troost N.C.H. ,
- Mohandas N. ,
- Cater S. ,
- Popovich V.A. and
- den Besten J.H.
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Friction stir welds were produced from S460N and S355N steel alloys for several combinations of welding speed and rotational speed with the heat input ranging from 130 to 180 [J/mm]; or, from insufficient to excessive. The welds were characterised at macro- and microscale using optics and x-ray diffraction and were tested for hardness and toughness distributions. Provided good equipment (i.e. tool and backing bar) as well as welding parameters and heat input within the broad acceptable range of high-quality welds, the base metal chemical composition and microstructure define the weld mechanical properties. Hardness and
toughness values similar to the base metal can even be obtained. Different from fusion welds, toughness rather than hardness measurements are required to detect brittle spots. The well known hardness-toughness relation does not apply to friction stir welds.
13th International Symposium, 21-23 May 2024, Session 7: Steel II, Paper 03
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