What is Hot Quenching in Welding?

Hot quenching is a process of cooling heated metals or alloys in a bath of molten metal or salt, instead of using a water or oil cooling medium. The main advantage of hot quenching over other methods is that it prevents the formation of austenite, which makes the metal harder and stronger.

How Does Hot Quenching Work?

  • Hot quenching works by rapidly cooling the metal, which prevents the formation of austenite.
  • The key to this process is to ensure that the metal is heated evenly so that it can cool evenly in the quench bath.
  • If the metal is not heated evenly, it will cool unevenly and may develop cracks.

Why is Hot Quenching Used?

Hot quenching is used because it prevents the formation of austenite, which makes the metal harder and stronger. By preventing the formation of austenite, hot quenching also prevents the metal from becoming brittle and breaking.

When Should Hot Quenching Be Used?

Hot quenching should be used when the metal is heated evenly.

What are the types of quenching?

There are two types of quenching: air and oil.

  1. Air quenching is the most common type of quenching. It involves cooling the metal in the air, using either a fan or natural convection.
  2. Oil quenching is less common than air quenching, but it is more effective at preventing the formation of austenite. Oil quenching involves cooling the metal in the oil, using either a pump or natural convection.

Fluorescence quenching

It is a type of quenching that uses light to cool the metal. Fluorescence quenching is more effective than air or oil quenching, but it is less common because it is more expensive.

Related Links

Hot-quench | Definition of Hot-quench
The basics of oil quenching in heat treating | Paulo
Definition of hot-quenching – mindat.org glossary
How Quenching Hardens Steel in Metalworking

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