The weldability of different steel materials is inversely proportional to their own hardening properties, which refer to the ability to produce martensite during cooling after steel welding.
The hardening properties of steel depend on its chemical composition.
If a steel material contains a high proportion of carbon and other alloying elements, its hardening characteristics are higher, so the weldability is relatively low.
To compare the weldability of different alloy steels, a method called equivalent carbon content can be used, which can reflect the weldability of different alloy steels relative to ordinary carbon steel.
 

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