Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Effects of Welding Condition on Microstructure and Mechanical Property of Energy Resistance Welding Alloy Steel Pipes

합금강관의 Energy Resistance Welding 용접조건에 따른 미세조직 거동 및 기계적 특성 연구

  • Lee, Kyung-Min (School of Materials Science of Engineering, Pusan National University) ;
  • Lee, Dong-Eon (Research Institute, Seah Steel Corporation) ;
  • Kim, Sung-Woong (Research Institute, Seah Steel Corporation) ;
  • Yoon, Byung-Hyun (Research Institute of Industrial Science & Technology) ;
  • Kang, Hee-Jae (School of Materials Science of Engineering, Pusan National University) ;
  • Kang, Nam-Hyun (School of Materials Science of Engineering, Pusan National University) ;
  • Cho, Kyung-Mox (School of Materials Science of Engineering, Pusan National University)
  • Received : 2010.11.10
  • Accepted : 2010.12.09
  • Published : 2011.01.27
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Abstract

Energy resistance welding (ERW) is a pipe-producing process that has high productivity and low manufacturing cost. However, the high heat input of ERW degrades the mechanical property of the pipe. This study investigates the effect of heat input and alloying elements on microstructure and mechanical properties of ERW pipes. As the heat input increased, the ferrite amount increased. The ferrite amount in the weld centerline was larger than t at in the weld boundary. Medium carbon steels (S45C and K55) having 0.3~0.4wt.% carbon yielded a significant difference of ferrite amount in the weld centerline and weld boundary. High alloyed steels (DP780 and K55) having 1.5~1.6wt.% Mn showed a ferrite rich zone in the weld centerline. These phenomena are probably due to decarburization and demanganisation in the weld centerline. As the ferrite fraction increased, the hardness decreased a little for the S45C steels. In addition, DP780 steels and K55 steels showed that the hardness drops when those steels have a ferrite rich zone. But we demonstrated the good tensile property of the DP780 steels and K55 steels in which Mn is included.

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References

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  1. Microstructure and Mechanical Properties of High Strength and Stretch-Flangeability Hot-Rolled Steels vol.22, pp.1, 2012, https://doi.org/10.3740/MRSK.2012.22.1.016