Hydrogen-Assisted Cracking in Pipeline Applications
Hydrogen-assisted cracking (HAC) is one of the greatest threats to the integrity of pipeline welding applications. Pipeline welding contractors need to be proactive in mitigating hydrogen in the welding zone — and that starts with understanding sources of hydrogen and how to eliminate them. This article covers best practices for managing the hydrogen threat including the importance of low-hydrogen filler metal selection, suitable handling and storage of the pipe and filler metals and proper pre-weld, post-weld and interpass heating. Through careful attention to these factors welders can minimize the risk of hydrogen-assisted cracking in pipeline applications.