Which mechanism reduces the effective yield strength of steel rebar during welding?

💡 Explanation

Welding steel rebar with high heat input causes rapid localized heating and cooling leading to the formation of untempered مارتينزite, a brittle phase, which reduces effective yield strength because of reduced ductility. Therefore, forming martensite results, rather than only affecting ductility, increasing hardness or inducing strain, which have distinctly different mechanisms.

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