Gas pipeline construction and repair processes imply much girth butt welding. Arc welded joints are prone to defects: cracks, incomplete fusion with groove, pores, non-metallic inclusions, undercuts, incomplete penetration, imperfect shape, and more. At present, butt welded joints are subject to visual, measuring, radiographic, and ultrasonic non-destructive testing (NDT) as per PJSC Gazprom regulatory documents. These methods are used in both manual and automated modes. Data analysis and weld quality assurance based on the test results are carried out for each test method separately, given their advantages and disadvantages. Importantly, modern non-destructive testing means allow the accumulation of various data digitally to further analyze, process, and structure them. To date, there are many different analysis algorithms and models whose selection is based on the data amount and format and other specific features. The study considers the existing approaches to weld quality assurance in gas pipelines that imply an integrated analysis of non-destructive test data. The technique will significantly increase the likelihood of detecting weld defects and reduce the false indication rejection.
Keywords: GIRTH WELDS, NON-DESTRUCTIVE TESTING, PLANAR AND NON-PLANAR DEFECTS, COMBINED DATA PROCESSING, WELD QUALITY ASSURANCE.