Electric heating – Metal heating – For bonding with pressure
Patent
1976-02-09
1977-08-16
Truhe, J. V.
Electric heating
Metal heating
For bonding with pressure
219131R, B23K 920
Patent
active
040428001
ABSTRACT:
Apparatus for indicating the time and welding current of a welding cycle is provided, along with means for monitoring the welding current and for preventing further welding cycles if the current is outside certain preset limits. The invention is used with stud welding apparatus in which a stud is placed against a workpiece, then withdrawn, and at the same time a pilot arc is formed; subsequently, a main welding arc is established which forms pools of molten metal on the stud and on the workpiece, the metal solidifying when the stud is subsequently plunged against the workpiece, thereby completing the weld. The length of time of the welding cycle and the welding current flowing during the existence of the main welding arc have, of course, heretofore been measured under laboratory conditions. However, such has not been accomplished under field conditions with commercial stud welding apparatus and particularly where such is accomplished by measuring both the welding time and welding current on a single meter. In a preferred form, the time and current values are stored through the use of relatively low-cost capacitors to make the invention even more practical. In addition, the average weld current is sensed after the weld is complete and further welds can be prevented if this current is not within certain limits.
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J. Markus, Sourcebook of Electronic Circuits, June 1969, p. 787.
Gutchess, Jr. Allen D.
Shaw Clifford C.
Truhe J. V.
TRW Inc.
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