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JWJ > Volume 33(1); 2015 > Article
Journal of Welding and Joining 2015 February;33(1) :87-93.
Published online February 28, 2015.
doi:https://doi.org/10.5781/JWJ.2015.33.1.87
A Study on optimization of welding process parameters for J-Groove dissimilar metal weld repair of pressurizer heater sleeve in nuclear power plants
Hong Seok Cho*, Ik Keun Park**, Kwang Woon Jung***
*Graduate School of Energy and Environment, Seoul National Univ. of Science & Technology, Seoul 139-743, Korea
**Dept. of Mechanical and Automotive Engineering, Seoul National Univ. of Science & Technology, Seoul 139-743, Korea
***Technology Research and Development Institute, KEPCO KPS, Naju 520-350, Korea
Correspondence: Kwang Woon Jung  Email: jungkw99@kps.co.kr
  Published online February 28, 2015
ABSTRACT
This study was performed to develop repair technology for J-Groove dissimilar metal weld of pressurizer heater sleeve in nuclear power plants. Pad, J-Groove automatic welding and mechanical machining equipments to develop repair technology using ‘Half Nozzle Repair’ were designed and manufactured. To obtain the optimum welding process parameters during Pad temperbead overlay welding, several welding experiments using Taguchi method were conducted. Weldability of Pad overlay weld specimens was estimated by PT/RT test, FE-SEM, EDS and Vickers hardness test. Also, J-Groove welding to adjust weld shape conditions requiring in ASME Code was carried out and its integrity of weld specimens was evaluated through PT/RT test and optical microscope. Consequently, it was revealed that Pad and J-Groove overlay welding for dissimilar metal weld of pressurizer heater sleeve could be possible to meet Code standard without weld defect.
Keywords: ASME code | Temperbead welding | J-Groove welding | Half nozzle repair | Vickers hardness
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