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Prediction of welding-induced distortions in large weld structure through improved equivalent load method based on average plastic strains

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Abstract

Prediction and minimisation of weld-induced distortion at the design stage incites pre and in-process mitigation techniques to improve the weld structure. As a result, it inhibits the need for post welding processes like line heating, straightening etc. In this work, to get more accurate results for distortion prediction, an effort has been made to improve the existing equivalent load method. In this method, the transient behaviour of plastic strain distribution was considered to analyse the large welded structure. Here, the actual transient phenomenon of a weld was considered, i.e. the effect of start, end and middle quasi-steady-state was considered. The separate average loads were applied at the start, middle and end regions of the welding line instead of the same average load throughout the weld length. This proposed method was validated with experimentally obtained results, which showed a perfect agreement and hence, confirmed its efficacy. This method was also validated for published results for different welding joints to assure its effectiveness. At last, a large weld structure was analysed for distortion prediction by using the proposed equivalent load-based technique.

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Authors and Affiliations

  1. Department of Mechanical Engineering, National Institute of Technology Mizoram, Aizawl, Mizoram, India

    Saurav Suman

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

    Saurav Suman, P. V. S. S. Sridhar & Pankaj Biswas

  3. Department of Mechanical Engineering, Royal School of Engineering and Technology, Guwahati, Assam, India

    Deepjyoti Das

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  1. Saurav Suman
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  2. P. V. S. S. Sridhar
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  3. Pankaj Biswas
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  4. Deepjyoti Das
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Correspondence to Pankaj Biswas.

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Recommended for publication by Commission XV - Design, Analysis, and Fabrication of Welded Structures

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Suman, S., Sridhar, P.V.S.S., Biswas, P. et al. Prediction of welding-induced distortions in large weld structure through improved equivalent load method based on average plastic strains. Weld World 64, 179–200 (2020). https://doi.org/10.1007/s40194-019-00805-1

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  • DOI: https://doi.org/10.1007/s40194-019-00805-1

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