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The influence of laser welding configuration on the properties of dissimilar stainless steel welds

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Abstract

Laser beam welding of dissimilar ferritic/martensitic stainless steels was performed in constrained butt joint configuration with the objective of identifying the influence of the melting ratio between the two base metals on the ultimate shear strength of the welds. Based on a full factorial design, experiments demonstrated that varying the incidence angle up to 45° and offsetting the focal position with respect to the materials’ interface within the limits imposed by the laser spot diameter are a reliable method to control the melting ratio and maintaining the expected resistance length at the material interface. The weld configuration parameters were correlated by means of the analysis of variance (ANOVA) method with shear resistance length and the melting ratio: the incidence of surface cracks can be significantly reduced increasing the ferritic steel area, involved in the formation of seam, over 60 % of the whole melt zone. Push-out tests performed on the specimens revealed that such a configuration has beneficial aspects on the ultimate shear strength of the seam meaning that the prevailing effect is the decreased brittleness of the weld by decreasing its carbon content under 0.5 % in weight.

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Authors and Affiliations

  1. Department of Industrial Engineering, University of Parma, Parma, Italy

    L. Romoli

  2. Department of Industrial and Production Engineering, Shahjalal University of Science and Technology, Shahjalal, Bangladesh

    C. A. A. Rashed

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  1. L. Romoli
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  2. C. A. A. Rashed
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Correspondence to L. Romoli.

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Romoli, L., Rashed, C.A.A. The influence of laser welding configuration on the properties of dissimilar stainless steel welds. Int J Adv Manuf Technol 81, 563–576 (2015). https://doi.org/10.1007/s00170-015-7234-8

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  • DOI: https://doi.org/10.1007/s00170-015-7234-8

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