Apparatus for welding a stud to a workpiece

Details Apparatus for welding a stud to a workpiece Apparatus for welding a stud to a workpiece

1993-01-27

1993-10-12

Shaw, Clifford C.

Electric heating

Metal heating

For bonding with pressure

B23K 920

Patent

active

052528022

ABSTRACT:
Apparatus is presented herein for controlling a stud welding gun for welding a stud to a workpiece. The stud welding gun has a gun body and a gun shaft mounted to the body in such a manner to permit reciprocal movement of the shaft relative to the body. The shaft has a distal end having means for carrying a stud to be welded to the workpiece. A linear motor is carried by the gun for directly driving the shaft in forward and reverse directions between fully extended and fully retracted positions relative to the gun body. A floating point detector provides a control signal when the stud engages the workpiece as the shaft is being driven in a forward direction to establish a reference position of the gun body relative to the workpiece. A control responds to the floating point signal for controlling the motor for driving the shaft in the reverse direction to a retracted lift position away from the workpiece and in the forward plunging direction to a plunge position causing the stud to engage the workpiece to achieve welding.

REFERENCES:
patent: 5030815 (1991-07-01), Glorioso
patent: 5070226 (1991-12-01), Raycher et al.

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