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http://dx.doi.org/10.5781/KWJS.2010.28.5.051

Techniques for Estimating Temper Bead Welding Process by using Temperature Curves of Analytical Solution  

Lee, Ho-Jin (Dept. of Nuclear Materials Research, KAERI)
Lee, Bong-Sang (Dept. of Nuclear Materials Research, KAERI)
Park, Kwang-Soo (Corporate R&D Institute, Doosan Heavy Industries &Construction)
Byeon, Jin-Gwi (Corporate R&D Institute, Doosan Heavy Industries &Construction)
Jung, In-Chul (Corporate R&D Institute, Doosan Heavy Industries &Construction)
Publication Information
Journal of Welding and Joining / v.28, no.5, 2010 , pp. 51-57 More about this Journal
Abstract
Brittle microstructure created in a heat affected zone (HAZ) during the welding of low alloy steel can be eliminated by post-weld heat treatment (PWHT). If the PWHT is not possible during a repair welding, the controlled bead depositions of multi-pass welding should be applied to obtain tempering effect on the HAZ without PWHT. In order to anticipate and control the tempering effect during the temper bead welding, the definition of temperature curve obtained from the analytical solution was suggested in this research. Because the analytical solution for heat flow is expressed as a mathematical equation of weld parameters, it may be effective in anticipating the effect of each weld parameter on the tempering in HAZ during the successive bead depositions. The reheating effect by the successive bead layer on the brittle coarse grained HAZ formed by earlier bead deposition was estimated by comparing the overlapped distance between the temperature curves in the HAZ. Three layered weld specimens of SA508 base metal with A52 filler were prepared by controlling heat input ratio between layers. The tempering effect anticipated by using the overlapped distance between the temperature curves was verified by measuring the micro-hardness distribution in the HAZ of prepared specimens. The temperature curve obtained from analytical solution was expected as a good tool to find optimal temper bead welding conditions.
Keywords
Temper bead welding; Tempering; Analytical solution; Temperature curve; Overlap;
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  • Reference
1 INCONEL alloy 690, Special Metals Corporation, 2003
2 A.S.Aloraier, et al.: Eliminating post-weld heat treatment in repair welding by temper bead technique; role bead sequence in metallurgical changes, Journal of Materials Proceeding Technology, 153-154, (2004), 392-400   DOI   ScienceOn
3 2007 ASME Boiler & Pressure Vessel Code, Section IX, QW290, 2007, 48-50
4 Temper Bead Welding, TGN-PE-02, Welding Technology Institute of Australia, 2006
5 Walter J. Sperko, et al.: Exploring Temper Bead Welding, Welding Journal, July (2005), 37-40
6 Material Reliability Program: Technical Basis for Preemptive Weld Overlays for Alloy82/182 Butt Welds in PWRs (MRP-169), EPRI Technical Report 1012843, 2005, 6.8-6.9
7 A Klenk, et al.: Some Characteristics of Weld Repair for Creep Applications, Weld Repair for Creep Applications, OMMI, 2-1 (2003), 1-32
8 Koichi Masubuchi: Analysis of Welded Structures, Pergamon Press, 1980, 69-73
9 J.-K. Hong: Study of Numerical Methodologies for Multi-Pass Welding Analysis, Ph.D Dissertation, The Ohio State University, 1996, 30-59
10 S. K. Jeong, et al.: An analytical solution for transient temperature distribution in fillet arc welding including the effect of molten metal, Proc Instn Mech Engrs, 211, Part B, (1977), 63-72
11 M. Necati Ozisik: Heat Transfer, McGraw-Hill Book Company, 1985, 82-84