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Technical Brief

Study on the failure mechanism of burn-through during in-service welding on gas pipelines

[+] Author and Article Information
Wu Qian

School of Materials Science and Engineering, China University of Petroleum, No. 66, Changjiang West Road, Huangdao District, Qingdao, China, 266580
upcwuqian@163.com

Wang Yong

School of Materials Science and Engineering, China University of Petroleum, No. 66, Changjiang West Road, Huangdao District, Qingdao, China, 266580
wangyong@upc.edu.cn

Han Tao

School of Materials Science and Engineering, China University of Petroleum, No. 66, Changjiang West Road, Huangdao District, Qingdao, China, 266580
hantao@upc.edu.cn

Wang Hongtao

School of Materials Science and Engineering, China University of Petroleum, No. 66, Changjiang West Road, Huangdao District, Qingdao, China, 266580
whongtao1002@163.com

Gu Shiwei

School of Materials Science and Engineering, China University of Petroleum, No. 66, Changjiang West Road, Huangdao District, Qingdao, China, 266580
upcgsw@163.com

Han Laihui

School of Materials Science and Engineering, China University of Petroleum, No. 66, Changjiang West Road, Huangdao District, Qingdao, China, 266580
13370841859@163.com

1Corresponding author.

ASME doi:10.1115/1.4042461 History: Received August 09, 2018; Revised December 28, 2018

Abstract

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.

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