Apparatus for controlling a welding tool

Details Apparatus for controlling a welding tool Apparatus for controlling a welding tool

1990-11-28

1991-07-09

Shaw, Clifford C.

Electric heating

Metal heating

For bonding with pressure

B23K 920

Patent

active

050308157

ABSTRACT:
Apparatus is provided for welding a stud to a workpiece. The stud is positioned against the workpiece in such a manner that the stud retracts from an extended first position to a second position against the workpiece. The stud is then retracted away from the workpiece to a fully retracted third position. Welding current is provided so as to establish a welding arc between the stud and the workpiece as the stud is being retracted to the third position. The stud is then plunged toward the workpiece to make contact therewith. The displacement of the stud from its initial first position to the second position is measured during the time that the stud is in engagement with the workpiece and before the stud is retracted therefrom to the third position. The plunging of the stud toward the workpiece is controlled as a function of the measured displacement in such a manner as to control the point in time at which the stud makes contact with the workpiece.

REFERENCES:
patent: 3136880 (1961-03-01), Glorioso
patent: 3291958 (1964-06-01), Glorioso
patent: 3392257 (1965-12-01), Glorioso
patent: 4797529 (1989-01-01), Schmitt et al.

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