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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

  • Received : 2012.11.28
  • Accepted : 2013.02.22
  • Published : 2013.02.28

Abstract

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.

Keywords

Thermal stress;Laser welding;Thin plate welding;Finite elements method;SCP1-S

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Acknowledgement

Supported by : 한국연구재단