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

해석 해의 온도곡선을 이용한 템퍼비이드 용접공정 평가기술

  • 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)
  • 이호진 (한국원자력연구원, 원자력재료연구부) ;
  • 이봉상 (한국원자력연구원, 원자력재료연구부) ;
  • 박광수 (두산중공업, 기술연구원) ;
  • 변진귀 (두산중공업, 기술연구원) ;
  • 정인철 (두산중공업, 기술연구원)
  • Received : 2010.01.13
  • Accepted : 2010.06.28
  • Published : 2010.10.31

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

References

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