... smell, no poison, no noise, no dust, no pollution.3.Full automatic safty device, stop the leakage of electricity, short circuit ... greatly increases.Scrap rateSimple operation and easy learn, no corrosion edge, leave out phenomenon, scrap rate is extremely low.Processing ... protective film easy reaction with liquid which causes corrosion edge and the scrap rate is very high.PollutionWithout excitant ...