Thermomechanical processing, also known as thermo-mechanical treated bars' (TMT), is a metallurgical process that integrates forging, rolling and/or work hardening with heat-treatment into a single process. The TMT bars have a hard outer surface and a softer core. Their manufacturing process includes hot rolled steel wires passed through water. This makes the surface hard and keeps the core warmer and softer. This helps in making the steel corrosion resistance and also increase its weldability.