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 in terms of welding using GMAW(gas metal arc welding), this study seeks to examine how welding characteristics of ATOS 80 may vary depending on protrusion length of wire electrode. The major characteristics of this study can be summed up as follows, this study analyzed welding characteristics of ATOS 80 by changing the protrusion length of wire electrode (10㎜, 15㎜ and 20㎜) in welding section, and also used visual inspection and 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
  3.1 와이어전극돌출길이 변화에 따른 용접부이음 특성
  3.2 와이어전극돌출길이 변화에 따른 스패터변화량 특성
 4. 결론
 참고문헌

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