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This research aims to understand how heat input and filler metal strength affect the microstructure and mechanical properties of welded S700MC steel.

July 2, 2026Journal of Manufacturing and Materials ProcessingOpen Access

Influence of Heat Input and Strength Matching on the Microstructure and Mechanical Properties of GMAW Butt-Welded S700MC High-Strength Low-Alloy Steel

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This research aims to understand how heat input and filler metal strength affect the microstructure and mechanical properties of welded S700MC steel.
Investigated heat input levels of 0.6, 1.4, and 1.8 kJ/mm with metal-cored arc welding (MCAW) on S700MC steel.
Performed microstructural characterization, hardness measurements, tensile testing, Charpy impact testing, and ANOVA analysis.
Evaluated effects of filler metal strength matching and undermatching on weld characteristics.
Lowest heat input (0.6 kJ/mm) yielded highest strength retention, especially with matching filler, but resulted in localized hardness peaks approaching 400 HV0.01.
Intermediate heat input (1.4 kJ/mm) achieved the best balance of strength and toughness, with a homogeneous microstructure and smoother hardness distribution.
Increasing heat input expanded the heat-affected zone (HAZ) and decreased hardness due to microstructural recovery.

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Implication

Randomized trial investigates microstructure and mechanical properties in high-strength low-alloy steel welds, highlighting optimal conditions for strength and toughness.

Cite This Study

Preichardt et al. (2026) studied this question.

synapsesocial.com/papers/6a4600a29ed1343031310b88 https://doi.org/10.3390/jmmp10070230

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Implication

Randomized trial investigates microstructure and mechanical properties in high-strength low-alloy steel welds, highlighting optimal conditions for strength and toughness.

Influence of Heat Input and Strength Matching on the Microstructure and Mechanical Properties of GMAW Butt-Welded S700MC High-Strength Low-Alloy Steel

Key Points

Discussion

Implication

Cite This Study

Influence of Heat Input and Strength Matching on the Microstructure and Mechanical Properties of GMAW Butt-Welded S700MC High-Strength Low-Alloy Steel

Key Points

Discussion

Implication

Cite This Study

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