High Frequency Welding Machine For PVC ,Tarpaulins,Tents,Billboards,Signs,Trucks Covers,Canvas,Membrane. Antiflash NL-5557,CE Stationary High Frequency Welder For Tarpaulins, Tents, Billboards, Signs, Truck CoversThe ... curved electrodes for welding round window profiles made of clear PVC and any other shapes requiring precision sealing.High Frequency Tarpaulin welding machine is equipped ...