Heat affected Zone

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The area in a metal weld where the metal's microstructure and properties have been changed by heat from the welding process, but not melted. It's often the weakest part of a thermite rail weld.

Videos Mentioning Heat affected Zone

Why Don’t Railroads Need Expansion Joints?

Why Don’t Railroads Need Expansion Joints?

Veritasium

The area in a metal weld where the metal's microstructure and properties have been changed by heat from the welding process, but not melted. It's often the weakest part of a thermite rail weld.