Strength Assessment and Defect Detection in Welded Pipeline Seams by Means of Brittle Tensosensitive Coatings

摘要

In bench tests, the use of brittle tensosensitive rosin coatings for defect detection and strength assessment of the weld seam close to T pieces in oil pipelines is considered. The cracking pattern in the brittle coating yields a map of the stress-strain state at the surface of the T piece over the perimeter of the side-pipe weld and permits identification of likely failure zones. The maximum strain due to the working loads in the most stressed zones of the structure may be estimated.