Patent Number: 6,294,750

Title: Method and apparatus for automatically adjusting air pressure in a pneumatic weld head

Abstract: A pressure regulator system for a pneumatically- or hydraulically-actuated weld head. The weld head includes a switching valve comprising several ports: an inflow port attached to a source of pressurized gas, preferably air; an exhaust port; a first line port; and a second line port. Two-way valves are provided on the first line port and the second line port. A valve sensor connected to a switch for determining weld force in the weld head is connected to means for simultaneously closing the first line port valve and the second line valve port when a desired weld force is attained between one or more electrodes and a workpiece, thereby maintaining a constant, maximum pressure in the cylinder and consequently maintaining the desired weld force between the electrode(s) and the workpiece during the welding operation.

Inventors: Al-Nabulsi; Talal M. (San Gabriel, CA)

Assignee: Unitek Miyachi Corporation

International Classification: B23K 11/31 (20060101); B23K 11/25 (20060101); B23K 3/08 (20060101); B23K 3/00 (20060101); B23K 11/30 (20060101); B23K 003/047 (); B23K 011/24 ()

Expiration Date: 09/25/2018