AC Pulse Pneumatic Spot Welding Machine , Stud / Bolt AC Spot Welder Descripition Under the operation of transformer, pneumatic AC pulse welder utilizes theh general mains supply to lower the voltage and increase the electric current. Such kind of low voltage but large current will be transmitted from the electrode to the linked point of two pieces. SPECIFICATION Model Input Voltage Input Power Output Current Pressurization Electrode Stroke Closure Platform Distance Electrode