Proceedings of the KSR Conference (한국철도학회:학술대회논문집)

The Korean Society for Railway (한국철도학회)
권호 표지

Friction Stir Welding in Extrusion Aluminum Carbody of HEMU-400X (Highspeed EMU-400km/h eXperiment)

차세대 분산형 고속전철용 압출재 알루미늄 합금의 마찰교반접합

  • 장웅성 (포항산업과학연구원(Rist) 용접센터) ;
  • 천창근 (포항산업과학연구원(Rist) 용접센터) ;
  • 김흥주 (포항산업과학연구원(Rist) 용접센터) ;
  • 박인규 (현대로템(주) 기술연구소 선행제품개발팀) ;
  • 백진성 (현대로템(주) 기술연구소 선행제품개발팀) ;
  • 노양환 (코레일 기술본부 차량기술단 고속차량개발팀)
  • Published : 2008.06.12
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Abstract

Since its invention at TWI in 1991, Friction Stir Welding (FSW) has become a major joining process in the aerospace, railway and ship building industries especially in the fabrication of aluminium alloys. In an attempt to optimize the friction stir welding process of Al alloys for extrusion Aluminium carbody of HEMU-400X (Extrusion Aluminum 6xxx series), effects of joining parameters such as tool rotating speed, plunging depth and dwelling time on the weld joints properties were evaluated. Experimental tests were carried out for butt joined Al plates. A wide range of joining conditions could be applied to join Al alloys for Extrusion Aluminum 6xxx series without defects in the weld zone except for certain welding conditions with an insufficient heat input. The microstructures of welds have dynamic-recrystallized grain similar to stir zone in FSW weld. For sound joints without defects, at the rotation speed of 700 rpm with different welding speeds, the tensile strengths of the Stir Zone(SZ) were almost the same, 80% of those of the base metal. (JIS Z 2201)

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