Study of verification and validation of standard welding procedure specifications guidelines for API 5L X-70 grade line pipe welding

Author(s): Qazi H. A. A.

Affilation(s): Crescent Steel and Allied Products Ltd., Latifabad, Hyderabad, Sindh, Pakistan

*Corresponding Author’s Address: [email protected]

Issue: Volume 4; Issue 2 (2017)

Paper received: September 29, 2017
The final version of the paper received: November 25, 2017
Paper accepted online: November 28, 2017

Qazi H. A. A. Study of verification and validation of standard welding procedure specifications guidelines for API 5L X-70 grade line pipe welding / H. A. A. Qazi // Journal of Engineering Sciences. —  Sumy : Sumy State University, 2017. — Volume 4, Issue 2. — P. B11-B14.

DOI: 10.21272/jes.2017.4(2).b11

Research Area: Investigation of Operating Processes in Machines and Devices

Abstract: Verification and validation of welding procedure specifications for X-70 grade line pipe welding was performed as per clause 8.2, Annexure B and D of API 5L, 45th Edition to check weld integrity in its future application conditions. Hot rolled coils were imported from China, de-coiling, strip edge milling, three roller bending to from pipe, inside and outside submerged arc welding of pipe, online ultrasonic testing of weld, HAZ and pipe body, cutting at fixed random length of pipe, visual inspection of pipe, Fluoroscopic inspection of pipe, welding procedure qualification test pieces marking at weld portion of the pipe, tensile testing, guided bend testing, CVN Impact testing were performed. Detailed study was conducted to explore possible explanations and variation in mechanical properties, WPS is examined and qualified as per API 5L 45th Edition.

Keywords:  welding procedure specification WPS, welding procedure qualification record WPQR, submerged arc welding SAW, american petroleum institute API, american society for testing materials ASTM, tensile test, guided bend test, charpy V-notch impact test.


  1. API 5L 45th Edition Specification for Line Pipe. American Petroleum Institute, 2013.
  2. ASTM A370. Standard Test Methods and Definitions for Mechanical Testing of Steel Products. ASTM International.
  3. ASME Section IX. QW Welding. ASME International, 2017.
  4. Rampaul, H. (2003). Pipe Welding Procedures. Industrial Press, New York, USA.
  5. Coryell, K. W. (2005). The Professional’s Advisor on WPS/PQR Cross Reference Tables. American Welding Society, Miami, USA.
  6. Pullarcot, S. K. (2002). Practical Guide to Pressure Vessel Manufacturing. CRC Press, Boca Raton, USA.
  7. Jeffus, L., & Baker, B. (2016). Pipe Welding. Delmar-Cengage Learning, Inc., Montgomery, USA.
  8. Kikani. P., & Shah S. (2015). Comparison of WPS and PQR for Pressure Vessel Welding. LAP Lambert Academic Publishing, Saarbrucken, Germany

Full Text