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Vol.13 No.1previousAA175-AA176
Academic Articles
Regular Paper Vol.13 No.1 (2021) p.12 - p.20
 

A Novel Simulation Method of Thermal Cycle in Multi-pass Welding Process by Temper Bead Technique

 

Lina YU1 , Kazuyoshi SAIDA1 , Masahito MOCHIZUKI1 , Kazutoshi NISHIMOTO1 and Naoki CHIGUSA2

 
1Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
2The Kansai Electric Power Co., Inc., 8 Yokota, 13 Goichi, Mihama-cho, Mikata-gun, Fukui 919-1141, Japan
 
Abstract
Temper bead welding technique has been developed as one of effective repair method for pressurized water reactor, in case that post weld heat treatment (PWHT) is difficult to carry out. It is essential to confirm the tempering effect on the mechanical properties, and the appropriate welding conditions in temper bead welding needs to be predicted before the actual welding. Therefore, in this study, a novel numerical simulation method was proposed for predicting the temperature distribution and thermal cycle during multi-pass welding process by temper bead technique. As the results, the temperature distribution, such as Ac1 line and weld metal line, were in good agreement between simulated and experimental results. Furthermore, based on the simulated thermal cycles the hardness distribution in heat affected zone (HAZ) was calculated, and the calculated hardness was in good accordance with the experimentally measured result. It follows that the currently proposed simulation method is effective for estimating the tempering effect during temper bead welding prior to actual welding.
 
Keywords
Temper bead welding, Simulation model, FEM, Temperature distribution, Hardness
 
Full Paper: PDF
Article Information
Article history:
Received 23 October 2020
Accepted 1 May 2021