저탄소강의 알루미늄코팅조건에 따른 Nd:YAG 레이저 용접특성

Welding Characteristics of Low Carbon Steel with Al Coating Condition by Nd:YAG Laser

  • 김종도 (한국해양대학교 기관시스템공학부) ;
  • 이정한 (한국해양대학교 대학원) ;
  • 김숙환 (포항산업과학연구원 용접센터) ;
  • 김기철 (포항산업과학연구원 용접센터)
  • 발행 : 2007.05.30

초록

Aluminized steel sheet that Al coated on low carbon steel has a excellent heat resistance, thermal reflection and corrosion resistance. It has applied to fuel tank, automotive exhaust systems, etc. Laser weldability of the aluminized steel for the full penetration welding will be described in this paper. We focused on the effect of Al coating conditions on weld strength. For these objectives, aluminized steel sheets that has various thickness and coating weight were prepared for laser welding. And then, tensile-shear and hardness test were carried out. At that same time, Al content mixed in weld after laser welding was evaluated and investigated a correlation between the mixed Al and mechanical properties. Besides, as removing partially coating layer, weldability has been investigated according to position of coating layer. As a result of this study, as increasing Al content in weld, tensile-shear strength was decreased. Also it was identified that Al of coating layer caused grain growth.

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