Corrosion-resistant light-weight spot welding gun

Claim 1

A corrosion-resistant light-weight spot-welding gun, comprising an aluminum spot-welding gun body having a forward portion with a fixed jaw containing a fixed electrode socket and having a cooling water passageway communicating at its forward end with said fixed electrode socket and at its rearward end adapted to be connected to cooling water supply and discharge conduits, a movable aluminum spot-welding gun jaw movably mounted on said body and having a forward portion with a movable jaw containing a movable electrode socket and having a coolng water passageway communicating with said movable socket and at its rearward end adapted to be connected to cooling water supply and discharge conduits, said fixed and movable sockets being adapted to receive and hold hollow fixed and movable spot welding electrodes respectively communicating with said passageways, sealing means interposed between said sockets and said passageways for excluding water from said sockets, means on said body operatively connected to said movable jaw for moving said movable jaw toward and away from said fixed jaw whereby to move the welding electrodes into and out of welding engagement with a workpiece placed therebetween, a bipolar welding cable connection on said body adapted to be connected to the terminal connectors of an electrical supply welding cable, and means for conducting electricity of different polarities from said welding cable to said fixed and movable jaws respectively. the internal surfaces of said cooling water passageways having nickel-plated corrosion resistant coatings thereon.