• Title/Summary/Keyword: 냉연 압연 강판

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A Effects of Magnetic Field For Fiber Laser Micro Welding Process Using Carbon Steel of SCP1-S (자기장 영향에 따른 냉연압연 강판의 파이버 레이저 마이크로 접합 공정)

  • Lee, C.K.;Lee, W.R.
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.21 no.3
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    • pp.433-438
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    • 2012
  • We have studied on welding dissimilar materials of Carbon steel SCP1-S by using laser beam. In this research we have performed some experiments to know the possibility of welding dissimilar materials using laser beam and magnetic fields by adjusting the power output of 35W laser. Other conditions of the experiments were as follows : the welding speed was varied in the range 10 m/min nitrogen gas was used as shield gas, the flow value of shield gas was ranged 10 L/min. In order to ascertain of the welded surface, we have done the tensile strength testing, the hardness testing and the microscope observation. As a result, we have found that tensile strength was the highest at the condition of the welding speed of 10mm/s, the flow value of 10 L/min, the gap of two materials 0, and the use of nitrogen gas. Above testings have also showed that the tensile strength was generally satisfactory since the penetration of welding was almost complete due to the thinness of the materials. In addition, the formation of the welded area was excellent when it had the highest tensile strength.

Evaluation of the Stress Occurring Phenomenon for Cold-Rolled Carbon Steel During a Laser Welding Process (냉연 압연 강판의 레이저 용접 공정 시 발생하는 응력 평가)

  • Lee, Chulku;Lee, Wooram
    • Journal of Welding and Joining
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    • v.31 no.1
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    • pp.51-57
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    • 2013
  • Residual stress caused in the weldments with high restraint force are often observed during welding in the weldments of Inner and outdoor materials or radial tanks. The reason is that quantitative analysis about thermal stresses during laser welding is lacking for this weldments. To verify Finite Elements Method (FEM) theory, the temperature was measured with thermocouple in a real time in this paper. Also analysis of the thermal stress for welding condition is performed by Comsol program package on various welding condition in SCP1-S butt welding. The principal stress in laser welding process is seen through the width direction. Also, it was confirmed that a change in base metal by thermal expansion made the stress in width direction stronger. Base metal close to the weld bead as the process progresses to the tensile stress in the compressive stress was varied. It was shown that the change of stress was quantitative from the bead at a certain distance.