Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
권호 표지

Laser Weldability of Sheet Steels for Tailored Blank Manufacturing (II) -Effect of Joint Configuration-

테일러드 블랭크용 박판 강재의 레이저 용접성 (II) -이음 형상이 용접성에 미치는 영향-

  • 김기철 (포항산업과학연구원 접합가공연구팀) ;
  • 이기호 (포항산업과학연구원 접합가공연구팀) ;
  • 이목영 (포항산업과학연구원 접합가공연구팀)
  • Published : 1998.04.01
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Abstract

In this paper, the laser weldability of thin gage steels for automobile application is discussed. Welding was carried out with a high power carbon dioxide laser system, and the laser energy was concentrated through a plano-convex lens. Test results showed that the joint gap in the butt welding proved to be one of the critical conditions for an acceptable weld. In the case where the ratio of the gap clearance to the material thickness was slightly bigger than optimal value, the weld strength was reduced showing weld metal fracture. It was possible to obtained a weld penetration ratio of 0.91 when the vertical offset ratio was controlled to be 0.4 or smaller. Results also demonstrated that the weld strength of the lap joint was influenced by travel speed. At the travel speeds lower than 37 mm/s, the weld strength indicated higher value than that of class A recommendation strength of a resistance spot weld based on the KS code. It was clear that the complicated effect of specimen alignment should be considered so as to make a sound weld with high integrity when the laser process was applied to the long weld line.

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References

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