Induction welding is a form of welding that uses electromagnetic induction to heat the workpiece. The welding apparatus contains an induction coil that is energised with a radio-frequency electric current. This generates an electromagnetic field that is picked up by electrically conducting parts of the workpiece. The induced currents that flow in the workpiece cause resistive heating.

Nonconducting materials such as plastics can also be induction-welded by implanting them with metallic or ferromagnetic compounds, called susceptors, that absorb the electromagnetic energy from the induction coil.