... frequency, no transformer is needed, longlife Application Characteristic1, Welding property: adopt revolving magnetic field, adjust the currency by excitation, high ... 12 antipodal, 720Hz. Power supply is intermediate frequency, no transformer is needed, and it can ... used for lighting, angel grinder, rotary sander, etc. H200 Engine Driven Arc Welding Machine ModelH200H200-1Generator Welding TypeManual ...