... frequency welding machine professional design for PVC fabric, tent, ceiling, truck cover, PVC ceiling, PVC inflatable High frequency welding machineIts main feature:1. Automatic motor ... 3. NL5557spark yare circuit device;4. To finish welding and cutting for one time,with convinience and exact ... of leather and paper card.6. Its application:Welding and cutting of paper board,vehicle pad,sunshineproof ...