... sheet metal, all kinds of metal weldingspot welding machineMulti-pulse precision spot welding machine Feature:1, Performance characteristicsUP-23 is ... three-dimensional electrode-conditioning, so the operator can easily welding a variety of shapes, sizes of material. In addition ... . UP-23 have large power, simple operation, reliable welding.2, The application of weldingLithium-ion battery (group), Ni ...