Cracking Cause of Welded Joint of Pipe Socket of High Temperature Superheater Outlet Header

ZHU Haibao; CHEN Zhuoting; BAI Jia; GUO Yanjun; LIU Ming; TIAN Linan; QIAO Lijie

doi:10.11973/jxgccl202209017

Materials and Mechanical Engineering > 2022 > 46(9): 106-109. > DOI: 10.11973/jxgccl202209017

ZHU Haibao, CHEN Zhuoting, BAI Jia, GUO Yanjun, LIU Ming, TIAN Linan, QIAO Lijie. Cracking Cause of Welded Joint of Pipe Socket of High Temperature Superheater Outlet Header[J]. Materials and Mechanical Engineering, 2022, 46(9): 106-109. DOI: 10.11973/jxgccl202209017

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Cracking Cause of Welded Joint of Pipe Socket of High Temperature Superheater Outlet Header

Huadian Electric Power Research Institute Co., Ltd., Hangzhou 310030, China

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Received Date: June 20, 2021
Revised Date: July 17, 2022

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Abstract

Abstract

During the maintenance period, the crack defect was detected during the magnetic particle inspection of the welded joint of the outlet header of a high temperature superheater in a power plant. The failure analysis of the pipe socket welded joint was carried out by stress distribution simulation, microstructure observation and hardness test. The results show that during the long-term high-temperature service, the coarse-grained area of the heat affected zone of the welded joint of the high temperature superheater outlet header was seriously aging, and the aging grade reached level of 4.5; the high-temperature mechanical properties significantly decreased. At the same time, the improper on-site installation of strong counterpart caused the additional secondary stress concentration of the tube panel. Under the additional secondary stress, the cracks initiated at the coarse-grained area of the heat affected zone on the upper half circle of the welded joint of the pipe socket. With the extension of service time, the substrate structure in the crack was decarbonized, and high temperature creep cracking occurred in the welded joint.
- high temperature superheater outlet header,
- welded joint of pipe socket,
- creep crack,
- secondary stress

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