Today’s snippet discusses the steel needed for wind turbines, as well as necessary repairs welds, and code adherence.
Many WT structural components are made from S355 structural steel.
The designation represents a Yield strength of 355MPa (this reduces slightly as sections get thicker than 16mm)
If it is correctly rated to -20 DegC, then it has adequate resistance to brittle fracture down to that temperature.
Be careful though; there are cheaper grades available that are only rated to 0 DegC or +20 DegC.
Remember that all grades are still susceptible to fatigue cracking near welds and stress concentrations.
Yes. Codes such as BS EN 10025 limit the allowable Carbon Equivalent to a level that is welded, providing proper WPS/PQRs are used.
• Have site repair welds been welded fully to code (WPS/PQRs etc)?
• Do repair welds meet code visual acceptance criteria (fillet size, linear indications, leg length, profile etc)?
• Is there evidence repair materials meet the correct impact temperature rating for the grade (e.g. -20 DegC)?
If you have any questions about the Wilkinson Coutts Wind Turbine Inspector Cert, contact Paul Wilkinson or Craig Coutts via these two emails:
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