600㎫급 자동차용 고장력강판의 CO₂ 레이저 용접부의 특성에 미치는 보호가스의 영향

• 영문명: Effect of shield gas on the characteristics of CO₂ laser welded 600㎫ grade high strength steel
• 발행기관: 한국레이저가공학회
• 저자명: 한태교(Tae-Kyo Han) 이봉근(Bong-Keun Lee) 강정윤(Chung-Yun Kang)
• 간행물 정보: 『한국레이저가공학회지』한국레이저가공학회지 제7권 제2호, 19~26쪽, 전체 8쪽
• 주제분류: 공학 > 기계공학
• 파일형태: PDF
• 발행일자: 2004.08.01

영문 초록

  The effect of shield gas on the weldability, mechanical properties and formability of CO₂ laser weld joint in 600㎫ grade high strength steel was investigated. Bead on plate welds were made under various welding speed and shield gas. Tensile test was carried out under the load of perpendicular and parallel direction to the weld line. Formability of the joint was evaluated by Erichsen test.
  As the welding speed increases, the porosity fraction decreases. The porosity fraction in the joint used Ar-50%He mixed gas as a shield gas was lower than that of the joint used Ar gas. Hardness at the weld metal of full penetrated joint was nearly equal to that of water quenched raw metal. In a tensile test under a perpendicular load to the weld axis, strength and elongation of joint produced by optimum condition were nearly equal to those of base metal. However, the strength of joint in a tensile test under a parallel load to weld axis was higher than that of raw metal, but the elongation of joint was lower than that of raw metal. Elongation and formability were further increased by the method of using Ar+He mixed gas as a shield gas as compared with Ar gas. Formabilities of joints were recorded ranging from 58% to 70% of that of base metal with different shield gases.

목차

Abstract
1. 서론
2. 실험방법
3. 결과 및 고찰
4. 결론
참고문헌

키워드

600㎫ high strength steel CO₂ laser shield gas mechanical property formability