Growcontrols manufactures High Frequency Induction Welding. Growcontrols is an ISO 9001:2000 accredited company. The company manufactures high power inverters, rectifiers and power supplies for industrial and traction applications. The High Frequency Induction Welding is a form of welding that uses electromagnetic induction to heat the work piece. The welding apparatus contains an induction coil that is energized with a radio-frequency electric current. This generates a high-frequency electromagnetic field that acts on either an electrically conductive or a ferromagnetic work piece. The location of welding depends upon the specific application, whether they are to be done in reduced pressure, atmospheric conditions, or at vacuum pressure.