Below is a list of Induction Heat Treating manufacturers from W Lafayette, Ohio. Induction heat treating uses induction heaters to perform the heat treating process. Induction heaters use electricity to run an AC, or alternating current, through a coil in order to heat various metals. Induction heat treatment, like other forms of heat treating is a process used to harden or soften metal by heating or cooling until it reaches the desired level of hardness.