Assessing Toughness of Pressurized Fluid Channel: Experiment using CTOD in Spiral Submerged Arc Welded Pipes

This study determines the mechanical properties and Crack Tip-Opening Displacement (CTOD) values for spiral-submerged arc-welding pipes for pressurized fluid channels application. The specimens were tested for mechanical properties, and the CTOD specimens were tested following the ASTM E18201) standard guideline, evaluating weld and base metal. Investigations were conducted on spiral submerged arc welded pipe, revealing good fracture toughness. The base metal exhibits higher CTOD values, indicating superior toughness than the weld metal. The load versus CMOD curve demonstrates a larger plastic region for the base metal than the weld metal. This research confirms the compliance with mechanical properties requirements for API 5L-X70 grade pipeline steels and provides insights into CTOD values for spiral-submerged arc welding pipe at room temperature.