Dual function welder: Contact/Induction welding. Power: 60KW～2000KW. Frequency: 100KHZ～800KHZ. The low output ripple, the smoothly welding, reaching high output efficiency as high as above 90% and still being able to adjust and troubleshoot conveniently. The high power inverse model researched by us who single layer power has achieved 120KW as twice as the older one has extended the manufacture ability of high power inverse device.