Electric heating – Metal heating – By arc
Patent
1998-04-20
2000-04-04
Shaw, Clifford C.
Electric heating
Metal heating
By arc
B23K 9127
Patent
active
060464313
ABSTRACT:
Arc welding control apparatus includes a laser (10) for projecting a first reference mark (24) along a first axis onto the line of a weld (26) and a video camera (12) arranged to view the work piece along a second axis to generate a video image including the first reference mark. The apparatus is mounted on a welding torch for movement therewith, the first and second axes intersecting at a predetermined point relative to the video camera. Sensor control means (30) receives the video signal from the video camera, and generates a composite video signal representing the original image with an image of a second mark superimposed therein. The position of the second mark is adjustable within the image frame. The position of the welding torch is set such that the welding electrode is positioned with the first mark projected onto the line of the weld ahead of the torch. The location of the second mark is adjusted within the image frame such that it is aligned with the first mark. During welding, the position of the second mark is monitored and the vertical and/or horizontal position of the welding torch is adjusted so as to maintain the first and second reference marks in alignment. The invention may be adapted to enable remote dimensional measurements of the workpiece.
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