The purpose of this study is to determine more variables in welding characteristics of ATOS(Steel for Automobile Structure) 80 high tensile steel available in market, and examine how welding characteristics of ATOS 80 vary depending on changes in improvement angle of welding sections. In regard to major characteristics of this study, it focused on analyzing welding characteristics of ATOS 80 by changing improvement angle of welding sections into 40°, 50° and 60° and by changing root gap into 2㎜ and 3㎜. And it also used radiograph test to examine observations of major defects on welding section.

Abstract
 1. 서론
 2. 실험 장치 및 방법
  2.1 실험 재료 및 용가재
  2.2 실험 방법
  2.3 방사선투과시험 조건 및 촬영
 3. 실험 결과 및 고찰
 4. 결론
 참고문헌

• 임주헌(군장대학교 자동차기계계열(인천대학교 대학원)) | Ju-Hun Lim
• 우창기(인천대학교 기계공학과) | Chang-gi Woo 교신저자