ASCE MOP 79, Chapter 11 Welding, Overview · 2018-05-10 · ASCE MOP 79, Chapter 11 –Welding,...
Transcript of ASCE MOP 79, Chapter 11 Welding, Overview · 2018-05-10 · ASCE MOP 79, Chapter 11 –Welding,...
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ASCE MOP 79, Chapter 11 – Welding, OverviewNash Williams-National Welding Corp.
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“Welding of steel penstocks is critical to the success of hydroelectric projects.”
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• Welding requirements previously spread throughout 6 chapters
• Committee task was to compile into a single welding Chapter
• Consolidated by removing redundancies and conflicts
• Welding design still based on ASME Section VIII, Division 1
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Variety of Penstock configurations Overview
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Welding Procedures and PracticesUtilize both ASME Sect. VIII or AWS D1.1
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Welding Procedures comprised of 3 key documents
• Procedure Qualification Record (PQR)
• Welding Procedure Specification (WPS)
• Welder Performance Qualification (WPQ)
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Welding Procedure SpecificationProvides parameter ranges
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Welder Performance QualificationDocuments a welders ability to deposit sound welds
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Longitudinal joints are generally full penetration butt joints (CJP)
Circumferential joints can be a butt weld or fillet weld (designer discretion)
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Plug Welds have been added to this manual
Less common joint type but often found beneficial to designers intending to increase joint strength
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Welding Processes
• FCAW (Flux Cored Arc Welding)
• GMAW (Gas Metal Arc Welding)
• SMAW (Shielded Metal Arc Welding)
• SAW (Submerged Arc Welding)
Flux Cored Arc Welding Gas Metal Arc Welding
Shielded Metal Arc WeldingStick-Manual
Submerged Arc Welding
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Assembly and Thermal Affects
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Bifurcations and Joint Designs
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Importance of InspectionSee Chapter 14
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Question & Answer