On the Heat-Affected Zone Role for Mechanical Properties of Structural-Steel MIG and CMT–MIG Weldments

The effect of evolved heat-affected zone (HAZ) during metal inert gas (MIG) and cold metal transfer (CMT)–MIG welding of two IS2062 structural-steels, i.e. E250 and E410, was studied. The comparison of mechanical properties such as yield strength, ultimate tensile strength, tensile ductility being r...

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Bibliographic Details
Published in:Transactions of the Indian Institute of Metals 2024-11, Vol.77 (11), p.3905-3913
Main Authors: Khajuria, Akhil, Misra, Anurag, Shiva, S.
Format: Article
Language:English
Subjects:
Chemistry and Materials Science
Cold welding
Corrosion and Coatings
Elongated structure
Gas metal arc welding
Heat affected zone
Impact strength
Materials Science
Mechanical properties
Metallic Materials
Microhardness
Microstructure
Optical properties
Original Article
Pearlite
Rare gases
Room temperature
Structural steels
Tribology
Ultimate tensile strength
Weldments
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Summary:The effect of evolved heat-affected zone (HAZ) during metal inert gas (MIG) and cold metal transfer (CMT)–MIG welding of two IS2062 structural-steels, i.e. E250 and E410, was studied. The comparison of mechanical properties such as yield strength, ultimate tensile strength, tensile ductility being represented by %elongation, impact toughness at room temperature, and microhardness was done. Conventional optical and field-emission scanning electron microscopy were used for detailed examination of microstructural evolution across weldments. CMT–MIG in comparison to MIG mode was observed to produce a well-refined microstructure for both E250 and E410. Various HAZ subzones comprised of fully formed pearlite colonies in coarse-grain HAZ, pearlite in patched form in fine-grain HAZ, partially distributed pearlite in inter-critical HAZ, and fine Widmanstätten and acicular ferrite in deposited weld-metal of ER-70S6. Such microstructural manifestations particularly in HAZ subzones exhibited a positive effect leading to improved mechanical performance.
ISSN:0972-2815
0975-1645
DOI:10.1007/s12666-024-03460-3