... compared with resistive heating method or more, shorter warming time for 6min. 2, reliable operation Intelligent multi-loop control system and ... .4.Hardware: the pre-forging for screws and nuts, silver soldering for lathe tool, the soldering for air gauge, the temper of ... pontil, the hardening of surface for high tensile screw, epoxy powder coating for locking nut etc. ModelWH-VI-60Worker ...