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

2 Overview Chapter 6 – Welding, Procedure and Operator Qualification 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 Welding Processes Chapter 6 – Welding, Procedure and Operator Qualification

4 Welding Basics Chapter 6 – Welding, Procedure and Operator Qualification 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 Welding Positions Chapter 6 – Welding, Procedure and Operator Qualification

6 SMAW Welding Basics Chapter 6 – Welding, Procedure and Operator Qualification 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 Welding Procedure Chapter 6 – Welding, Procedure and Operator Qualification 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 Welding Symbols Chapter 6 – Welding, Procedure and Operator Qualification

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

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

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