Fitting curves and impact toughness transition temperature of quenched and tempered steel welds

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Impact toughness varies, with lower grade 690 having higher toughness than grade 890's zones.
Transition temperatures from fitting curves indicate that all weld zones meet the allowable standards for toughness.
Welding temperatures for toughness tests varied from +20 °C to -60 °C, influencing the impact toughness results.
GMAW procedures proved effective, as all weld zones exceeded standard TT-30J values for structural steel.

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Analysis demonstrates varying transition temperatures and impact toughness in different weld zones, suggesting GMAW suitability.

Hajro et al. (2020) studied this question.

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