표면조도처리 된 합금화 용융아연도금강판의 저항 점 용접성

Resistance Spot Weldability of Surface Roughness Textured Galvannealed Steel Sheets

  • 박상순 (동의대학교 신소재공학과) ;
  • 김기홍 (동의대학교 신소재공학과) ;
  • 강남현 (부산대학교 재료공학부) ;
  • 김영석 (한국생산기술연구원 동남권 기술지원본부) ;
  • 임영목 (한국기계연구원부설 재료연구소 재료특성평가그룹) ;
  • 최영민 (POSCO 기술연구소 자동차소재연구그룹) ;
  • 박영도 (동의대학교 신소재공학과)
  • Park, Sang-Soon (Dept. of Advanced Material Engineering, Dong-eui University) ;
  • Kim, Ki-Hong (Dept. of Advanced Material Engineering, Dong-eui University) ;
  • Kang, Nam-Hyun (Division of Materials Science and Engineering, Pusan National University) ;
  • Kim, Young-Seok (Division for Dongnam Area Technology Service, Korea Institude of Industrial Techology) ;
  • Rhym, Young-Mok (Korea Institute of Materials Science Materials Test & Characterization Group) ;
  • Choi, Yung-Min (Automotive Steel Products Research Group, Technical Research Labs., POSCO) ;
  • Park, Yeong-Do (Dept. of Advanced Material Engineering, Dong-eui University)
  • 투고 : 2008.06.09
  • 발행 : 2008.08.25

초록

With the high proportion of zinc coated steels in body-in-white assembly, newly developed surface roughness textured galvannealed steel sheets have been introduced. In this study, zinc coated and surface roughness textured steel sheets were welded by resistance spot welding to investigate its weldability including electrode wear test. Based on the results of tensile-shear test, nugget diameter changes, and electrode tip growth test, it was clear that both surface roughness textured steels (GA-T and GA-E) showed good weldability. Also, there was no large difference in weldability and electrode wear behavior between GA-T and GA-E steels which have different surface roughness morphology. An analysis of electrode degradation showed Fe and Zn penetration through the electrode tip surface at 2400 welds reached $55{\sim}60{\mu}m$ and $75{\sim}80{\mu}m$, respectively. Therefore, there is no significant effect of surface roughness morphology on spot weldability of surface roughness textured galvannealed steel sheets. However, slight difference in thickness of alloying layers existing on electrode tip was found between GA-T and GA-E steels.

키워드

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