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

  • Received : 2012.02.03
  • Accepted : 2012.02.13
  • Published : 2012.02.29


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.


Friction welding;Post weld heat treatment (PWHT);As-welded;Base metal (BM);Heat affected zone (HAZ);Weld interface (WI);Welding condition


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