Louis F Grama

US Patent:

47912650, Dec 13, 1988

Filed:

Jul 29, 1986

Appl. No.:

6/890297

Inventors:

Alfred R. Senni - Burlington NJ
Louis F. Grama - Robbinsville NJ

Assignee:

Fifth Dimension Inc. - Trenton NJ

International Classification:

B23K 1100

US Classification:

219 912

Abstract:

An electric resistance welder comprises a frame and a movable arm mounted to the frame for gravitational movement relative thereto. A movable electrode is carried at an end of the movable arm. A stationary electrode is spaced opposite the movable electrode to accommodate a plurality of workpieces therebetween, with the movable electrode resting against the workpieces and gravitationally biased toward the stationary electrode. An electric pulse is conducted through the electrodes and workpieces for heating and softening the workpieces to enable the arm to accelerate toward the stationary electrode at the acceleration of gravity, whereby the movable electrode collapses the workpieces toward one another. A stop is arranged to be engaged by the arm for terminating travel of the arm when the movable electrode has traveled a predetermined distance toward the stationary electrode, and subsequent to termination of the electric pulse. Such a technique is highly suited toward the welding of a ball to a wire, the ball and wire having diameters no greater than 0. 04 inches.