Proceedings of the KWS Conference (대한용접접합학회:학술대회논문집)

The Korean Welding and Joining Society (대한용접접합학회)
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EVALUATION OF FRICTION WELDABILITY OF TYPE 5052 ALALLOY/LOW CARBON STEEL JOINT.

  • Kim, Kyung-Kyun (Asan Friction Welding Co.) ;
  • Lee, Won-Bae (Dep. of Advanced Materials Engineering, SungKyunKwan Univ.) ;
  • Yeon, Yun-Mo (Dep. of Automatic-Welding Engineering, Suwon-Science College) ;
  • Kim, Dae-Up (Dep. of Advanced Materials Engineering, SungKyunKwan Univ.) ;
  • Jung, Seung-Boo (Dep. of Advanced Materials Engineering, SungKyunKwan Univ.)
  • Published : 2002.10.01
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Abstract

The mechanical and metallurgical properties of friction welded joints type 5052 Al alloy/A36 steel have been studied in this paper. The joint strength increased with increasing upset pressure and friction time till it reached the critical value. The joint strength was fixed at low strength compare to that of base metal in the case of increasing friction time. Microstructure of 5052 Al alloy was greatly deformed near the weld interface. The very fine and equaxied grain structure was observed at the near interface. The elongated grain was formed outside dynamic recrystallizatoin region at the peripheral part, while the A36 steel' side was not deformed. The hardness of the near interface was slightly softer than that of 5052 Al alloy base metal. The maximum softening width was about 8mm from the interface. In the present work, the friction welding condition, t$_1$=0.5sec, P$_2$=137.5MPa, showed a maximum joint strength (202MPa) when friction pressure, upset time and rotation speed were fixed at 75MPa, 5sec, 2000rev/min and these were the optimum friction welding condition of 5052Al/A36 steel joints.

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