Resources & Insights
Technical Glossary
- ASME
- American Society of Mechanical Engineers: codes for the design and fabrication of pressure equipment (Sections VIII and IX).
- PED
- Pressure Equipment Directive (2014/68/EU): EU directive governing the marketing of pressure equipment.
- PWHT
- Post-Weld Heat Treatment: controlled heating after welding to relieve residual stresses.
- WPS
- Welding Procedure Specification: qualified document defining how a weld is to be made.
- PQR
- Procedure Qualification Record: test results that support a WPS.
- WPQ
- Welder Performance Qualification: certification of a welder's ability to follow a WPS.
- ITP
- Inspection and Test Plan: document defining inspection points and acceptance criteria.
- NACE
- Standards (e.g. MR0175) for materials resistant to sulfide stress cracking in sour service.
- HAZ
- Heat-Affected Zone: the base-metal region whose microstructure is altered by welding heat.
- CWI
- Certified Welding Inspector (AWS): qualification for visual welding inspection.