The induction heating is the heating of the workpiece by electromagnetic induction when eddy current generated by the workpiece is used.  Induction surface quenching has the following advantages over conventional quenching:

One.  Because a heat source is generated on the surface of the workpiece, the heating efficiency is high and the speed is fast.

Two.  This kind of nut does not require integral heating, so it will not produce obvious variation.

Three.  Because it can be heated in a short time, the amount of oxidation and decarburization produced on the surface is relatively small.

Four.  Due to its high surface hardness, the high-strength nut of this process has relatively high fatigue strength and wear resistance.  It is beneficial to develop the potential of materials, save material consumption and prolong the service life of parts.

Five.  This process has good working conditions, high degree of mechanization and automation, and is very convenient to use.

Under the action of alternating load and impact load (such as torsion and bending), some parts of the Threaded Rods And Eye Bolts bear higher stress than the center.  Under the condition of friction, the surface layer is often worn.  Therefore, high strength, high hardness, high wear resistance and high fatigue limit are required for the surface layer of some parts.  Only surface reinforcement can meet the above requirements.  Due to the advantages of small deformation and high productivity, surface quenching is widely used in production.