... fin tubes for radiators, PLC control, full automatic High frequency spiral fin tube welding machine is for producing spiral fin tubes for radiators, PLC ... -40mm (not bigger than base tube diameter) 5) Finished finned tube length: 8m, 12m, 16m 6) Equipped high frequency power: 100kVA, 200KVA, 300kVA, 400kVA ...