Process and a device for finding and following a hollow weld in shielded arc welding
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United States of America Patent
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Jun 19, 1990
Grant Date -
N/A
app pub date -
Aug 19, 1987
filing date -
Dec 20, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention concerns a process and a device for seeking and following a hollow weld during a shielded arc welding, especially welding with carbon dioxide gas. The welding torch is moved by a path-controlled manipulator, whereby prior to the welding the positional coordinates of one or more weld reference point of the hollow weld are found by mechanical contour probing and the actual position of the hollow weld found therefrom is saved in the path control. The lengthwise guidance is then done only through the appropriately corrected path control, only the height of the welding torch above the toe of the weld being adjusted in dependence on the welding current. The mechanical contour probing is done by contact sensing of the sides of the weld adjacent to the weld reference point, and the coordinates of the weld root point are computed from these data. For this purpose, the welding torch can swivel in its mounting and is provided with a switching disc which lifts away upon contact with the weld sides by deflection of the welding torch and sends a switching signal.
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