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Power Plant Construction and QA/QC Chapter 6 – Welding, Procedure and Operator Qualification

Engineering Technology Division. Power Plant Construction and QA/QC Chapter 6 – Welding, Procedure and Operator Qualification. Chapter 6 – Welding, Procedure and Operator Qualification. Overview. All Pressure Vessel Welding Requires Welding Procedures

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Power Plant Construction and QA/QC Chapter 6 – Welding, Procedure and Operator Qualification

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  1. Engineering Technology Division Power Plant Construction and QA/QC Chapter 6 – Welding, Procedure and Operator Qualification

  2. Chapter 6 – Welding, Procedure and Operator Qualification Overview • All Pressure Vessel Welding Requires Welding Procedures • All Pressure Vessel Welding Requires Welder Qualification • ASME Code Requires Procedure and Welder Qualification • Authorized Inspector Must Witness Procedure and Welder Quals • Authorized Inspector Must Witness a Sample of the Weld NDE

  3. Chapter 6 – Welding, Procedure and Operator Qualification Welding Processes

  4. Chapter 6 – Welding, Procedure and Operator Qualification Welding Basics • Welding is the process of joining two materials using an electric arc • Primary Welding Types • “Stick” – SMAW – Shielded Metal Arc Welding • “MIG” – GMAW – Gas Metal Arc Welding • “TIG” – GTAW – Gas Tungsten Arc Welding • “Sub Arc” – SAW – Submerged Arc Welding • Six Welding Positions – Flat, Horizontal, Vertical, Overhead, Horizontal Round and Inclined • Brazing and Soldering – Non Pressure Boundary

  5. Chapter 6 – Welding, Procedure and Operator Qualification Welding Positions

  6. Chapter 6 – Welding, Procedure and Operator Qualification SMAW Welding Basics • Flux Covered Rod • Negative Polarity • DC Voltage • Excellent Access • Wide Material Use

  7. Chapter 6 – Welding, Procedure and Operator Qualification GMAW Welding Basics • Gas Cover • Positive Polarity • DC Voltage • Thin Materials • Wide Material Use • Fast Process

  8. Chapter 6 – Welding, Procedure and Operator Qualification GTAW Welding Basics • Gas Cover • Negative Polarity • AC or DC Voltage • Wide Material Use • Manual Process

  9. Chapter 6 – Welding, Procedure and Operator Qualification SAW Welding Basics • Powder Flux • Negative Polarity • DC Voltage • Thick Materials • Fast Deposition

  10. Chapter 6 – Welding, Procedure and Operator Qualification Welding Procedure WPS – Welding Procedure Specifications PQR – Procedure Qualification Records WQ – Welder Qualification Records These items are based on a joint and material design by a Welding Engineer. NDE and bend testing (DE) is used to verify procedure compliance.

  11. Chapter 6 – Welding, Procedure and Operator Qualification Welding Symbols

  12. Chapter 6 – Welding, Procedure and Operator Qualification Welding Symbols

  13. Chapter 6 – Welding, Procedure and Operator Qualification Welding Symbols

  14. Chapter 6 – Welding, Procedure and Operator Qualification Destructive Testing Tensile Bend Charpy V Notch

  15. Chapter 6 – Welding, Procedure and Operator Qualification Questions?

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