Metallographic Techniques to Assess of Girth Weld Quality

In this section

Back to Core Research Programme AMorph – 4D Printing for Field Morphing Structures Automation of Composite and Hybrid Joining Process Coaxial Wire Additive Manufacturing Processes and In-Line Monitoring Tools Development of Coded Excitation Technique for Non-Metallic Pipes Inspection Development of Digital Twin technology as a demonstrator for real-time integrity assessment of crack growth in tensile specimens Development of Friction Stir Welding (FSW) for Hydrogen Fuel Storage Tanks Development of Leak-Before-Break Hydrogen Storage Composite Pressure Vessels With Polymeric Liner Establishing Assessment Methods for Determining Safe Service Limits of High-Temperature Materials in Extreme Environments Fracture toughness in aggressive environments: effect of crack monitoring techniques on test results In-process detection and non-destructive testing of electron beam weld imperfections Internal Bore Coatings for Applications in Corrosion and Hydrogen Environment Joining of Additively Manufactured Materials Long term behaviour of polymeric liner materials/coatings in hydrogen service Techniques for High Temperature Ultrasonic Inspection of Arc Welding Ultimate Leverage Fund

Project Code: 0902-13

Objectives

The aim of this work is to demonstrate the capabilities of advanced metallographic techniques for distinguishing between girth welds which perform differently in SSC testing.

Project Outline

Test material, comprising sections from two similar welds, one of which has passed four point bend SSC tests, and the other of which has failed, is available. The examination will be based around Electron Back Scattered Diffraction (EBSS) and Scanning Transmission Electron Microscopy (STEM) in the TWI high resolution FEG SEM. The work will be exploratory in nature, and will aim to discover if differences can be found in texture, microphases, residual strain (from steel/pipe manufacture), using EBSD and precipitates in the steel using extraction replicas and STEM. In the example material, a feature of the unexpected failures has been cracking in parent material, and therefore work will start with examinations of parent materials. The work will involve a degree of development of techniques (in particular for EBSD analysis of steels).

Metallographic Techniques to Assess of Girth Weld Quality

Objectives

Project Outline

Relevant Industry Sectors

Oil and Gas

Technical and Economic Benefits