Principles: High frequency vibration with pressure on thetwo metal surface, the friction force makes the two metal parts melt.  Advantagesof this kind welding are fast, energy-saving, high fusion strength, wellconductive, sparkless, closed to closed to cold processing, while the weakpoints of metal welding is the thickness of two metal part should be smaller orequal to 5mm, welding spot should be small and need pressure. Features: Keep the metal metallic character, goodconductivity, low electrical resistivity. Low requirements of welding surface, oxydic andelectroplating are both feasible. Sparkless, environmental safe. Application Areas: Nickel screen and nickel sheet welding innickel-hydrogen battery. Copper foil and nickel sheet, aluminum foil andaluminum sheet welding in Lithium battery and polymer battery. Flex wire welding. Ｗ ire and electronic components, pins,junctions and connectors welding. Radiating seat, heat exchanger fin andbeehive-type radiator welding in household appliances, automotive appliances. Heavy current connector welding and differentkind metal sheet welding of solenoid switch and no-fuse switch. Sealing of metal pipe, air-tight and watertight