case study
which prevents sensitisation and intergranular corrosion essential for welded assemblies in chloride-rich conditions. Its mechanical stability also allowed the structure to handle dynamic loads while maintaining alignment and minimal distortion. Fabrication detail All components were laser-cut from 316L plate to control distortion and ensure dimensional accuracy. Plate thickness ranged from 5.5 mm to 10 mm depending on load. Key elements included: • Main piping, 275 mm diameter x 10 mm wall x 5 m, extended to 7 m through precision joining.
• A 316L box beam, 400 mm x 400 mm x 5.5 mm, spanning ten metres as the main structural element.
All welding used 316L filler wire with Acral Chrome shielding gas, and welders were qualified to AWS D1.6 Stainless Steel Structural Code. Welding parameters, inter-pass temperatures, and bead geometry were logged in a detailed data pack for traceability.
After welding, all surfaces were pickled and passivated to restore the chromium-rich film essential for corrosion resistance and prepare the surface for long-term coastal exposure.
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Issue 4 – 2025
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