B - Operations – Transporting – 23 – K
Patent
B - Operations, Transporting
23
K
349/33, 342/47
B23K 11/00 (2006.01) B23K 11/11 (2006.01) B23K 11/25 (2006.01)
Patent
CA 1270319
ABSTRACT OF THE DISCLOSURE Apparatus and accompanying methods for use therein for measuring and controlling weld indentation during resistance welding operations are disclosed. During a welding operation, the apparatus measures changes in a distance separating a reference point located on an electrode assembly and a region situated on the surface of the workpiece being welded wherein the region is not substantially indented by the electrode. Specifically, a distance measuring system first establishes the location of the surface relative to the electrode before any welding current is passed through the weld area; the indentation is repeatedly measured by detection of ultrasonic echoes from the surface of the material being welded; such measure- ments are taken at frequent intervals during the current flow period during which the weld is being formed in order to determine on a continuous basis the indentation of the electrode into the surface; the welding power may be terminated when the measured indentation reaches the desired value. In order to obtain more precise control of the indentation; the rate at which indentation occurs can be measured and the welding power can be changed on a half cycle by half cycle basis to increase or decrease the indentation rate according to a desired indentation program.
540082
Dynamic Systems Inc.
Swabey Ogilvy Renault
LandOfFree
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