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Vol.6 No.2 previous AA 77 NT65

Academic Articles
Regular Paper Vol.6No.2 (2014) p.34 - p.47

Hardness Prediction of HAZ in Temper Bead Welding by Non-Consistent Layer Technique

Lina YU1*, Kazuyoshi SAIDA1, Masahito MOCHIZUKI1, Masashi KAMEYAMA2, Naoki CHIGUSA3 and Kazutoshi NISHIMOTO4
1Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
2Japan Nuclear Safety Institute, 5-36-7 Shiba, Minato-ku, Tokyo 108-0014, Japan
3The Kansai Electric Power Co., Inc., 8 Yokota, 13 Goichi, Mihama-cho, Mikata-gun, Fukui 919-1141, Japan
4Fukui University of Technology, Gakuen 3-6-1, Fukui-shi, Fukui 910-8505, Japan
Based on the experimentally obtained hardness database, the neural network-based hardness prediction system of heat affect zone (HAZ) in temper bead welding by Consistent Layer (CSL) technique has been constructed by the authors. However in practical operation, CSL technique is sometimes difficult to perform because of difficulty of the precise heat input controlling, and in such case non-CSL techniques are mainly used in the actual repair process. Therefore in the present study, the neural network-based hardness prediction system of HAZ in temper bead welding by non-CSL techniques has been constructed through thermal cycle simplification, from the view of engineering. The hardness distribution in HAZ with non-CSL techniques was calculated based on the thermal cycles numerically obtained by finite element method. The experimental result has shown that the predicted hardness is in good accordance with the measured ones. It follows that the currently proposed method is effective for estimating the tempering effect during temper bead welding by non-CSL techniques.
Hardness, Temper bead welding, Consistent layer technique, Low-alloy steel, FEM
Full Paper: PDF EJAM Vol.6 No.2 pp.34-47 "Hardness Prediction of HAZ in Temper Bead Welding by Non-Consistent Layer Technique"

Article Information
Article history:
Received 18 April 2014
Accepted 15 July 2014