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Experimental evaluation on weld zone of thin–laminated stacked sheets post-GTA weld of CRNO electrical steel

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Abstract

Electric motor industries widely use cold-rolled non-oriented (CRNO) electrical steel sheets (ESSs) as the magnetic core. The sheets are of low carbon–silicon, thin (0.5 mm), and laminated and joined as a stack with gas tungsten arc (GTA) welding. A weld zone is affected by the welding heat and dependent on welding current (30–110 A). The fusion zone (FZ) and heat-affected zone (HAZ) of the weld zone are analyzed for variation in the base metal (BM) and microstructural properties using a scanning electron microscope (SEM) and optical microscope (OM). The effects of weld depth, weld width, stress–strain relationship, filler material, and grain size are investigated with a weld current change. Tensile and micro-hardness testing in FZ and HAZ revealed a change of failure in zones, maximum fracture load, and micro-hardness. The effect of grain size and completely ferritic phases (α-phase and γ-phase) in the weld zone is also studied. All the properties variations are compared and correlated to the input welding heat on the thin–laminated, non-grain-oriented stack on ESS.

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Abbreviations

BCC:

Body-centered cubic lattice structure

CRNO:

Cold rolled non-grain-oriented electrical steel

EDS:

Energy-dispersive X-ray spectroscopy

FZ:

Fusion zone

GTA:

Gas tungsten arc

HAZ:

Heat-affected zone

SEM:

Scanning electron microscope

TIG:

Tungsten inert gas

UTS:

Ultimate tensile strength

WEDM:

Wire electric discharge machine

YS:

Yield strength

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Funding

Funding was provided by Science and Engineering Research Board, India (Grant No. CRG/2018/001619).

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Authors and Affiliations

  1. Department of Mechanical Engineering, Visvesvaraya National Institute of Technology (VNIT), Nagpur, 440 010, India

    Bhushan Y Dharmik & N K Lautre

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  1. Bhushan Y Dharmik
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  2. N K Lautre
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Correspondence to N K Lautre.

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Dharmik, B.Y., Lautre, N.K. Experimental evaluation on weld zone of thin–laminated stacked sheets post-GTA weld of CRNO electrical steel. Sādhanā 46, 71 (2021). https://doi.org/10.1007/s12046-021-01589-1

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  • DOI: https://doi.org/10.1007/s12046-021-01589-1

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