Annealer is a term used to describe a process for eliminating internal stresses and hardening materials. There are a variety of synonyms for annealer, including heat treatment, tempering, quenching, and cooling. Heat treatment is a process that involves heating up a material to a certain temperature and holding it there for a specified amount of time. Tempering is the process of heating up a material to a certain temperature, holding it there for a short time, and then cooling it down. Quenching is a process that involves cooling down a material rapidly after it has been heated up. Cooling is the process of allowing a material to cool down after it has been heated up.