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Evaluation of Mechanical Properties for Narrow-Gap Weld Zone in Reactor Coolant Loop

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Abstract:

Conventionally, shield metal arc welding (SMAW) process was applied to join pipes of RCL, which caused lot of loss in time and cost due to excessive heat input and defects in joining section. Recently, narrow-gap welding (NGW) process was introduced to overcome the disadvantages of SMAW. However, the application of NGW to nuclear power plant is not yet common because safety of NGW process is not proven. In present paper, the welded coupons are manufactured under different welding processes in carbon steel. Then, microstructure observations and various mechanical tests are performed. It is verified that the mechanical properties of carbon steel are greatly changed after repair welding process due to applied heat flux, and that the effect of post-welding heat treatment is beneficial.

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Info:

Periodical:

Key Engineering Materials (Volumes 297-300)

Pages:

2853-2858

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.297-300.2853

Citation:

Cite this paper

Online since:

November 2005

Authors:

Jae Do Kwon, Seung Wan Woo, Choon Yeol Lee, Suk Chull Kang, Ho Sang Shin

Keywords:

Carbon Steel, Fracture Toughness, General Weld, Mechanical Property, Narrow-Gap Weld, Reactor Coolant Loop, Repair Weld

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© 2005 Trans Tech Publications Ltd. All Rights Reserved

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