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Application of in situ post weld heat treatment using double pulse technology and its effect on microstructure and mechanical performance of resistance spot welded HSLA350 steel

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Abstract

In situ post weld heat treatment (PWHT) by applying a second pulse current during resistance spot welding (RSW) provides a new pathway to alter the microstructure of the fusion zone (FZ) and improves the mechanical performance of the RSW joint. In the present study, effect of the second pulse current on microstructural characteristics and mechanical performance of resistance spot weld joint of HSLA350 steel under were investigated. It was observed that after applying the second pulse current during welding process, it subdivides the initial solidified fusion zone into two zones, namely equiaxed grain zone (EGZ) and columnar grain zone (CGZ). The outer layer becomes EGZ consisting of quasi-equiaxed grains of ferrite and martensite whereas the inner core is CGZ solidified with a columnar grain structure consisting of martensite and some bainite. The refinement of microstructure in the case of double pulse weld resulted in enhanced tensile shear strength and failure energy absorption capacity with ductile pullout failure mode.

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Acknowledgments

The author thanks Bloxwich Sdn Bhd Malaysia for providing material for the present study.

Funding

This work was supported by the Universiti Teknologi PETRONAS Malaysia Grant URIF 0153AA-G23.

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  1. Mechanical Engineering Department, Universiti Teknologi PETRONAS, Block 18, Level 2, Suit no 10, 32610, Seri Iskandar, Perak Darul Ridzuan, Malaysia

    Imtiaz Ali Soomro & Srinivasa Rao Pedapati

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  1. Imtiaz Ali Soomro
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  2. Srinivasa Rao Pedapati
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Correspondence to Imtiaz Ali Soomro.

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Soomro, I.A., Pedapati, S.R. Application of in situ post weld heat treatment using double pulse technology and its effect on microstructure and mechanical performance of resistance spot welded HSLA350 steel. Int J Adv Manuf Technol 105, 3249–3260 (2019). https://doi.org/10.1007/s00170-019-04569-2

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