... -400liter/h7ml/h52×32×30(CM)37KG47This flame polishing machine electrolyze water into hydrogen, then we can use hydrogen ... flame to do polish, and welding. No pollution. Application:This machine especially used in Jewelry, Perspex, electronic, electrical machinery, motol ... gold, silver, copper and stainless steel welding.Polish the irregular surface of acrylic and other crafts.Gold, silver and copper ...