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Process optimization and performance evaluation on laser beam welding of austenitic/martensitic dissimilar materials

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Abstract

Laser beam welding of austenitic/martensitic dissimilar combination is used in a precision electromechanical product for function design. In order to achieve the better mechanical performance and physical performance of welding joints, process optimization was first carried out according to the Box-Behnken design method, and mathematical response models of weld depth and peak temperature value at special point were developed by multivariate quadratic/linear regression analysis. An optimal group of welding process parameters is obtained. Then, mechanical performance was evaluated by micro-structure analysis, non-destructive test, and uniaxial tensile test, and the influence of cooling style after laser beam welding process was discussed on hardness distribution and fracture force. It is shown that a rapid cooling style can avoid the crack occurrence at the heat-affected zone of austenitic stainless steel and enhance fracture force of weld joint. However, the hardness distribution is not even, and it has the highest value at the heat-affected zone of martensitic stainless steel and the lowest value at the heat-affected zone of austenitic stainless steel. However, the welding joint has a better mechanical performance under the condition of low temperature.

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Authors and Affiliations

  1. Institute of Electronic Engineering, China Academy of Engineering Physics, Mianyang, 621900, China

    W. W. Zhang & S. Cong

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  1. W. W. Zhang
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  2. S. Cong
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Correspondence to W. W. Zhang.

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Zhang, W.W., Cong, S. Process optimization and performance evaluation on laser beam welding of austenitic/martensitic dissimilar materials. Int J Adv Manuf Technol 92, 4161–4168 (2017). https://doi.org/10.1007/s00170-017-0513-9

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  • DOI: https://doi.org/10.1007/s00170-017-0513-9

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