We conclude on the governing mechanism of burn-through and identify the area of highest risk for burn-through occurrence due to a specific combination of loading in this area. In order to investigate the mechanism of burn-through during in-service welding, an exploratory study combining both experiments and finite element simulations was presented. Combined with the theory of high-temperature failure, the initial position of burn-through and its mechanism were discussed. The results showed that burn-through was a kind of intergranular brittle rupture happened at the cooling stage of in-service welding. It started from the partially melted zone, and the cracks expanded along the weakened grain boundaries. When the cracks eventually penetrated to the inner wall, burn-through happened.
Study on the Failure Mechanism of Burn-Through During In-Service Welding on Gas Pipelines
Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received August 9, 2018; final manuscript received December 28, 2018; published online February 21, 2019. Assoc. Editor: Bostjan Bezensek.
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Qian, W., Yong, W., Tao, H., Hongtao, W., Shiwei, G., and Laihui, H. (February 21, 2019). "Study on the Failure Mechanism of Burn-Through During In-Service Welding on Gas Pipelines." ASME. J. Pressure Vessel Technol. April 2019; 141(2): 024501. https://doi.org/10.1115/1.4042461
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