Castings form an integral part of the world's largest hydroelectric project. The world's largest hydroelectric project, the Three Gorges dam in China, will comprise 26 Francis turbines for the production of electricity. Each turbine runner is 10 metres in diameter, weighs 450 tonnes and will generate 700MW. The runners are made of solid 410 NiMo type martensitic stainless stele (13 percent Cr, 4 percent Ni, 0.5 percent Mo) castings. Welding is used for the assembly and repair of casting defects. ESAB is involved in the production of the runners with consumables and equipment for submerged arc welding (SAW) and gas metal arc welding (GMAW).
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