MATEC Web Conf.
Volume 315, 2020International Scientific Practical Conference “Materials science, shape-generating technologies and equipment 2020” (ICMSSTE 2020)
|Number of page(s)||8|
|Section||Theory and Technology of Welding Production|
|Published online||01 July 2020|
Residual life assessment of welded joints in the girth weld root
1 Sevastopol State University, 299053, str. University, 33, Sevastopol, Russia
2 Crimean Engineering and Pedagogical University named after Fevzi Yakubov, per.Uchebnyj, 8, Simferopol, 295015, Russia
3 Сlosed joint-stock company «Chelyabinsk interactive cable networks", st. Ordzhonikidze, 54-b, Chelyabinsk, Russia
* Corresponding author: email@example.com
The article analyzes the influence of the structural crack-like defect in the girth weld root welding the bottom to the collector body on the crack growth resistance. A mathematical model has been developed to estimate the residual life resource of welded joints with an internal crack-like defect in the root of the weld under creep. Results of metallographic studies of bench tests results for the welded joints long-term strength formed the basis of the calculation model. In all tested models the cracks start at the top of the narrow structural gap in the weld root and develop along almost the entire weld axis, perpendicular to the wall of the pipe and have a discrete growth pattern. As a result, discrete rupture of material occurs on a length of rc, and the initial crack is incremented by this length. After that, a “plastic core” of rc length is formed in the newly formed crack tip, additional damage is accumulated, and the crack development process continues until the stress level in the section weakened by the crack reaches a critical value. The obtained dependence characterizes the crack growth time from the initial crack-like defect to its critical length.
© The Authors, published by EDP Sciences, 2020
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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