In Situ Francis Turbine Blade Replacement due to Gross Cavitation
In Situ Francis Turbine Blade Replacement due to Gross Cavitation
In Situ Francis Turbine Blade Replacement due to Gross Cavitation
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Technical Aspects of Repair<br />
• Primary welding process for all areas was Flux Core Arc<br />
Welding (FCAW), a derivative process of GMAW (MIG) welding<br />
• Repairs abutting prior repair zones required special<br />
consideration as they contain surface and subsurface<br />
discontinuities<br />
• Random discontinuities found at repair margins<br />
• Selectively used Gas Tungsten Arc Welding process (GTAW)<br />
• The skills applied by the welders proved very successful<br />
eliminating defects and providing acceptable repairs<br />
• Acceptance criteria established by Voith Hydro and Mani<strong>to</strong>ba<br />
Hydro for the new repairs<br />
• <strong>In</strong> process inspections using liquid dye penetrant<br />
• Linear indications subject <strong>to</strong> Magnetic Particle <strong>In</strong>spection<br />
• All inspections were witnessed by Mani<strong>to</strong>ba Hydro<br />
<strong>In</strong> <strong>Situ</strong> <strong>Francis</strong> turbine <strong>Blade</strong> <strong>Replacement</strong> | NWHA Hood River| 2013-05-23<br />
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