... Patented technology of 12 antipodal, 720Hz. Power supply is intermediate frequency, no transformer is needed, longlife Application Characteristic1, Welding property: adopt ... ensures more than 95% DC output. The currency is smooth, with good dynamic character and fast response.2 ... technology of 12 antipodal, 720Hz. Power supply is intermediate frequency, no transformer is needed, and it can be used 72 ...