Induction hardening

Induction hardening is when we make something stronger and more durable by heating it up with electricity. Imagine you have a cookie dough that is a bit soft, but you want it to be harder on the outside. Instead of putting it in an oven, we will use electricity!

A big machine called an induction heater will make a strong electrical current in a special coil. We will put the thing we want to make harder, like a metal tool, inside the coil. When we turn on the machine, the electrical current will make the metal very hot, almost like it's on fire! But don't worry, it's okay because the metal is not actually on fire, it's just very, very hot.

When the metal gets really hot, it changes its structure to become stronger. It's like how a cake hardens when it cools down. But instead of waiting for it to cool, we'll cool the metal quickly with water or oil. This will make the outside of the metal super hard and strong, but leave the inside soft and flexible.

Now we have a metal tool that can do tougher jobs and last longer without breaking!