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<p>In the present investigations, a three-ply clad SS304/AA1050/SS430 sheet of 2.5&#xa0;mm thickness was bent using a laser source having a beam diameter not more than the total sheet thickness. An experimental setup with a laser machine with a robotic arm having a rated laser power capacity of 3&#xa0;kW is used for the experiments. The process parameters such as scan speed, laser power, and number of passes are tuned to achieve the maximum bending angle using a Taguchi approach, and the final parameters are tested with analysis of variance. The nature of residual stress setup in the innermost and outermost layers is also investigated, and the results are correlated with the microstructural features of the layers. Vickers microhardness technique was used to assess the microhardness of deformed and undeformed zones of laser-formed sheet samples at various positions across the length of a narrow heat-affected zone in the bend region. It is observed that the residual stress in the innermost layer is of compressive nature of the order of 220&#xa0;MPa, whereas the stress in the outermost layer of SS304 is one fourth of that of irradiated inner layer and is also compressive in nature. This distribution of the residual stress could be attributed to the thermal gradient and different coefficients of thermal expansion of the layers.</p>

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Experimental and Numerical Investigations for Laser Bending of a Three-Ply Clad Sheet Metal

  • 期刊论文

  • 发表日期：

    2025年6月10日

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  • Praveen Kumar Singh,
  • Vijay Gautam

摘要

In the present investigations, a three-ply clad SS304/AA1050/SS430 sheet of 2.5 mm thickness was bent using a laser source having a beam diameter not more than the total sheet thickness. An experimental setup with a laser machine with a robotic arm having a rated laser power capacity of 3 kW is used for the experiments. The process parameters such as scan speed, laser power, and number of passes are tuned to achieve the maximum bending angle using a Taguchi approach, and the final parameters are tested with analysis of variance. The nature of residual stress setup in the innermost and outermost layers is also investigated, and the results are correlated with the microstructural features of the layers. Vickers microhardness technique was used to assess the microhardness of deformed and undeformed zones of laser-formed sheet samples at various positions across the length of a narrow heat-affected zone in the bend region. It is observed that the residual stress in the innermost layer is of compressive nature of the order of 220 MPa, whereas the stress in the outermost layer of SS304 is one fourth of that of irradiated inner layer and is also compressive in nature. This distribution of the residual stress could be attributed to the thermal gradient and different coefficients of thermal expansion of the layers.