August 16, 2025CoatingsOpen Access

Study on the Influence of Heat Input on Microstructure and Properties of Q420C Steel Welded Joints

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Increasing heat input leads to significant microstructural changes, resulting in reduced impact toughness.
Charpy impact tests show that the weld metal remains tough across temperatures, despite heat input variations.
At 300 kJ/cm heat input, coarse ferrite forms in the heat-affected zone, leading to a shift from ductile to cleavage fracture.
Maintaining heat input below 200 kJ/cm is essential to preserve impact toughness in Q420C welded joints.

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Investigation reveals impact toughness reduction in Q420C welded joints as heat input increases, indicating optimal input levels.

Long et al. (2025) studied this question.

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