power plant construction and qa/qc chapter 6 – welding, procedure and operator qualification...
TRANSCRIPT
Power Plant Construction and QA/QC
Chapter 6 – Welding, Procedure and Operator Qualification
Engineering Technology Engineering Technology DivisionDivision
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
DestructiveTesting
Chapter 6 – Welding, Procedure and Operator Qualification
Bend
Charpy V Notch
Tensile
15
Questions?
Chapter 6 – Welding, Procedure and Operator Qualification