Abstract
For assessment of a limiting state and reliability of corroded pipelines under in-service repair welding, complex numerical methods of prediction of the kinetics of thermodeformation processes taking into account the ductile damage of material have been proposed. They allowed evaluating the features of interaction of stresses of different types (caused by operation loading along with the local stress concentrator near geometry anomaly and repair welding) and their influence on subcritical damage and limiting state of specific structure. The implementation of novel criterion of plastic instability gave an opportunity to trace the state of corroded pipeline under multipass in-service weld deposition repair and determine the allowable heat input parameters and optimal deposition scheme from the point of view of possible burnthrough and excessive residual deformation of the pipe. The generalization of calculation results as two-parameter diagrams showed the wider application of in-service repair welding of corroded pipelines in comparison with actual recommendations.
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The authors of this work are grateful to the Ukrainian armed forces and the world community, which is now helping Ukraine in the struggle for freedom and independence. Thanks to the unity and unbroken spirit of the Ukrainian nation during this period of our history, it is possible carrying out scientific researches for our peaceful and successful future.
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Milenin, A., Velikoivanenko, E., Rozynka, G. et al. Novel approach for numerical evaluation of limiting state and reliability of corroded pipelines under in-service repair welding. Weld World 67, 2373–2379 (2023). https://doi.org/10.1007/s40194-023-01543-1
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DOI: https://doi.org/10.1007/s40194-023-01543-1