???? Heating A Rusted Nut Red Hot With An Induction Heater - Video

???? Heating A Rusted Nut Red Hot With An Induction Heater

Induction heating is a flameless way to free a rusted, seized nut. The mechanic slides the curved copper coil of an induction heater over the corroded nut and holds it in place with pliers. When the heater is switched on, the coil's magnetic field makes the steel nut heat itself from the inside, so it turns dark red within seconds, then bright orange while a little smoke rises from the burning rust and grease. The surrounding parts stay much cooler because only the metal inside the coil is heated. The hot nut expands and the rust bond breaks, so it can usually be turned off with a wrench right after heating. Mechanics like this method because there is no open flame near hoses or paint, it is very quick, and it heats exactly the part that needs it.

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