Electric heating – Metal heating – For bonding with pressure
Patent
1975-09-19
1977-06-21
Reynolds, Bruce A.
Electric heating
Metal heating
For bonding with pressure
B23K 920
Patent
active
040313492
ABSTRACT:
Controls for use in end welding a stud to a workpiece by a drawn-arc technique are set forth. In welding a stud to a workpiece, an end of the stud is placed against the workpiece and is then retracted as a pilot arc is established between the stud and the workpiece. A welding arc is then superimposed on the pilot arc which causes portions of the stud and the workpiece to become molten. These portions join and solidify to securely weld the stud to the workpiece when the stud is plunged back to engage the workpiece. The controls include a timer dial on a control panel of the welding apparatus for setting the length of time of the welding arc, and a current dial on the control panel to set the current of the welding arc. Particularly for the control of the current, a unique circuit enables a desired current to be maintained even though the line voltage and the length of the welding cable vary over a wide range. The controls are accurate enough that the dials for the time and current can be set to recommended settings for a particular size of stud and effective welds will be achieved without any experimentation, assuming the amount of lift and plunge of the tool are also properly set.
REFERENCES:
patent: 3162747 (1964-12-01), Netzsch
patent: 3183372 (1965-05-01), Chin
patent: 3371242 (1968-02-01), Aldenhoff et al.
patent: 3526742 (1970-09-01), Hill
patent: 3530359 (1970-09-01), Grist
patent: 3562485 (1971-02-01), Glorioso
patent: 3597580 (1971-08-01), Stearns et al.
patent: 3781640 (1973-12-01), Toth
patent: 3826893 (1974-07-01), Glorioso
Gutchess, Jr. Allen D.
Reynolds Bruce A.
Shaw Clifford C.
TRW Inc.
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