... second / row security door welding machinery Input power supply single-phase AC380V±10%security door welding machineryWelding transformer AC80KVA alternating ... transformer, controlled silicon, welding head water-coolWelding range (single welding head) 2pc M5 screwWelding quality state welding spot ... the material quality of M5 screw and condition of the door panel face, power supply, jockey and so on, ...