Electric heating – Metal heating – By arc
Patent
1997-03-24
1999-01-19
Shaw, Clifford C.
Electric heating
Metal heating
By arc
2191304, 219133, 219137PS, 310254, B23K 9067
Patent
active
058616047
ABSTRACT:
A "hot start" method for arc welding includes selecting a first weld current, setting a time interval, striking an arc, flowing a second, higher weld current through the welding rod and then, after a brief time interval, reducing the current through the rod to the value of the first weld current. Also disclosed is a new arc welder stator having two groups of slots around a core. The group of larger slots contains the weld current windings and slots in the group of smaller slots contain windings for timing, gate voltage, battery charging, auxiliary power and the like. A new cooling apparatus for an arc welder has an air duct and a "double-bladed" fan for flowing air along several paths and cooling both the welder control section and the generating section. A new method for electronically controlling engine speed in an engine-driven arc welder is also disclosed. Such method includes manipulating a current-selecting device, contacting a work piece with a welding rod, accelerating the engine to an elevated speed and then either maintaining such speed or reducing it, depending upon the value of weld current selected.
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Jonas Jeffery J.
Kern Robert D.
McLean Graham W.
Ruehlow Gerald C.
Wedel Francis X.
Generac Corporation
Shaw Clifford C.
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