Journal of Ocean Engineering and Technology (한국해양공학회지)

Korean Society of Ocean Engineers (한국해양공학회)
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Optimization of Friction Welding for Motor Vehicle Safety Belts: Part 1-Mechanical Properties and Microstructure

수송차량 안전벨트용 모터축재의 마찰용접 최적화(1) - 기계적 특성 및 조직

  • Kong, Yu-Sik (Bukyong Education Center for Vehicle Safety Component Technology, Pukyong National University) ;
  • Ahn, Seok-Hwn (Bukyong Education Center for Vehicle Safety Component Technology, Pukyong National University)
  • 공유식 (부경대학교 수송기계 안전편의 융합부품소재 인재양성센터) ;
  • 안석환 (부경대학교 수송기계 안전편의 융합부품소재 인재양성센터)
  • Received : 2012.02.03
  • Accepted : 2012.02.13
  • Published : 2012.02.29
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Abstract

Dissimilar friction welds were produced using 15-mm diameter solid bars of chrome molybdenum steel (KS SCM440) and carbon steel (KS SM20C) to investigate their mechanical properties. The main friction welding parameters were selected to ensure good quality welds on the basis of visual examination, tensile tests, Vickers hardness surveys of the bond area and HAZ, and macro-structure investigations. The specimens were tested as-welded and post-weld heat treated (PWHT). The tensile strength of the friction welded steel bars was increased to 100% of the SM20C base metal under the condition of a heating time of more than four seconds. Optimal welding conditions were n = 2,000 (rpm), HP = 60 (MPa), UP = 100 (MPa), HT = 5 (s),and UT = 5 (s), when the total upset length was 7.8 (mm). The hardness distribution peak of the friction welded joints could be eliminated using PWHT. The two different kinds of materials were strongly mixed to show a well-combined structure of macro-particles, with no molten material, particle growth, or defects.

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References

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