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Characteristic difference of thermo-mechanical behavior in plasma microwelding of steels

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Abstract

In the microjoining process, heat input is the most distinctive parameter that is well correlated with the performance of the weld joint. On the ground of energy transferred at a particular travel speed, micro plasma arc welding is performed on 500-μm-thick plates of two different materials. The characteristic performance of the micro joint on different graded steels is analyzed in a comparative mode. A process window in terms of welding current and speed is evaluated to predict the defect-free microwelded joint. The plasma current range of 8–13 A produces high-quality welded joints for all the selected materials. For the same heat input to weld these materials, there is significant difference in weld geometry, residual distortion, and micro hardness. The finite element-based thermo-mechanical model is also developed to carry out the differential influence of process parameters for these two materials. The computationally estimated macrographs as well as residual distortion show relatively better agreement with the experimental results.

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Acknowledgements

The authors gratefully acknowledge the financial support provided by the Science and Engineering Research Board (SERB), India (Grant no. SERB/F/0797/2013-2014 dated 20.05.2013) to carry out this research work.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Indian Institute of Technology Guwahati, Guwahati, Assam, 781039, India

    M. Baruah & S. Bag

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  1. M. Baruah
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  2. S. Bag
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Correspondence to S. Bag.

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Recommended for publication by Select Committee MICRO - Research Developments and Applications in Micro- and Nano-Joining Technologies

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Baruah, M., Bag, S. Characteristic difference of thermo-mechanical behavior in plasma microwelding of steels. Weld World 61, 857–871 (2017). https://doi.org/10.1007/s40194-017-0472-7

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  • DOI: https://doi.org/10.1007/s40194-017-0472-7

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