Facilities. - eSA W59 Standard for Welded Steel Construction. • Standards for
weld qualification. - AWS B2.1 Wt~lding Procedure and Performance.
Qualification.
Weld Quality
Welding Qualification
& Certification
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.ecture 14
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Lecture
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• Need for welding qualification • Codes & standards requirements - Welding procedure specifications - Welding procedure qualification - Welding operator qualification
• Company certification
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Need IFor Weld Qualification • Many variables influence weld quality, related to the parts to be joined, the welding process and welding operator skill • The purpose of qualification is to demonstrate that welding procedures and personnel are adequately controlled and are capable of acceptable results • Such tests cannot foretell performance in produc::tion. Quality of the production welds should be determined by inspection during and after the actual welding.
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Lecture 14
Codes & Standards
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• Application codes & standards that specify qualification requirements for welding include: - ASME Boiler and Pressure Vessel Code
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- API 1104 Standard for Welding Pipelines and Related Facilities - eSA W59 Standard for Welded Steel Construction
• Standards for weld qualification - AWS B2.1 Wt~lding Procedure and Performance Qualification
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Codes & Standards Requirements • A common approach to qualify welding procedures is by preparation and testing of standard test pieces. The qualification tests need not be repeated unless the welding procedure specification is changed. • Some' pressure vessel standards require test plates to be welded at the same time as the vessel seams and subsequently tested. • Other standards accept certain welding procedures as "prequalified"
lecture 14
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Welding I)rocedure Specification
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• Standards normally require the contractor to prepare and qualify Welding Procedure Specifications (WPS) • A WPS should define the welding variables in sufficient detail to ensure that the required quality is met • Standards differ with respect to the generality or specificity of WPS - Some standards are very specific in defining the content of a WPS e.g. ASME Section IX. Other standards are more general
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Welding Procedure Specifications
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Typical VVPS Contents • scope • Base metal • to simplify qualifications, standards often group base metals by similar composition or streng1h levels
• • • • • •
Welding process Filler metal Type of current and range Arc voltage Travel speed Heat input
• • • •
Joint preparation _ Welding details Welding positions Preheat & interpass temperatures • Post weld heat treatment and finishing
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lecture 14
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ASME Salmple WPS
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1992 SECI10N IX
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