• Title/Summary/Keyword: 레이저 용접

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Evaluation of Mechanical Properties of Welded Metal in Tailored Steel Sheet Welded by $ CO_2$ Laser ($ CO_2$레이저 합체박판 용접부의 기계적 물성평가)

  • Ghoo, Bon-Young;Keum, Young-Tag
    • Journal of the Korean Society for Precision Engineering
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    • v.18 no.4
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    • pp.142-150
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    • 2001

  • Automotive manufactures have taken more interests in tailored sheet metals for improving the rigidity, weight reduction, crash durability, and cost savings so that their application to auto-bodies has been increased. However, since the tailored sheet metals do not behave like un-welded sheet metals in press forming operations, the stamping engineers no longer rely only on conventional forming techniques. Futhermore, there is no clear understanding of the characteristics of welded metal which influence the overall press formability of tailored sheet metals. Recently, the computer simulations are prevailing for the evaluation of the formability. Unfortunately, the mechanical property of tailored sheet metal has to be quantitatively defined in the simulation. In this study, the analytical equations are formulated in order to find the mechanical properties of the welded metal in the tailored sheet metal welded by co$_2$laser. Based on force distribution assumption, the constitutive behavior of the welded metal is investigated using uniaxial tensile test results of base metals and tailored sheet metal. Then, the strength coefficient, work-hardening exponent, and plastic strain ratio of laser-welded metal are calculate from those of base metals and tailored sheet metal. In addition, the existence of weld defects in the welded metal is indirectly detected by examining the slop of strength coefficient of the welded metal.

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Joining of Thin Metal Sheets Using Laser Plug Brazing (레이저 플러그 브레이징을 이용한 금속 박판의 접합)

  • 윤석환;나석주
    • Proceedings of the KWS Conference
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    • 2003.05a
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    • pp.228-230
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    • 2003

  • Recently, lots of joining methods of thin metal sheets are being developed in order to improve joint quality and productivity in manufacturing area. Current existing welding methods are continuously challenged as new materials and smaller thickness of metal sheets are required. In this study, laser plug brazing process was investigated as a new joining method of thin metal sheets. A CO2 laser system with automatic feeding of filler metal wire and flux was developed, and laser plug brazing experiments were conducted. The brazed joints were analyzed using various methods.

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Estimation of $CO_2$ Laser Weld Bead by Using Multiple Regression (다중회귀분석을 이용한 $CO_2$레이저 용접 비드 예측)

  • 박현성;이세헌;엄기원
    • Journal of Welding and Joining
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    • v.17 no.3
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    • pp.26-35
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    • 1999

  • On the laser weld production line, a slight alteration of the welding condition changes the bead size and the strength of the weldment. The measurement system is produced by using three photo-diodes for detection of the plasma and spatter signal in $CO_2$ laser welding. The relationship between the sensor signals of plasma or spatter and the bead shape, and the mechanism of the plasma and spatter were analyzed for the bead size estimation. The penetration depth and the bead width were estimated using the multiple regression analysis.

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