Importance

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Abstract

Approximate straight lines or approximate curves at the instructed points are obtained on the basis of coordinates actually passed by a welding torch at the instructed points in the welding of the first layer, points on the approximate straight lines or approximate curves are calculated on the basis of distance at the instructed points, and actual welding path is defined at the points. In the locus of the second and succeeding layers, a shift direction and a shift amount are obtained by calculation on the basis of two points instructed as a welding start point and a termination point in the teaching of the first layer and two reference points designated to define the shift direction, and the locus of operation after the second layer is calculated to effect multi-layer welding. For controlling the torch attitude in the welding of the second layer and succeeding layers, a locus of operation of a torch in the welding of the first layer and a locus of operation of the second and succeeding layers are obtained on the basis of a torch rotational angle given from the outside, after which the torch is rotated by a portion of a torch rotational angle about the traveling vector obtained at the instructed point, and the attitude data is obtained by calculation. Welding of the second and succeeding layers is carried out on the basis of the obtained attitude data.

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First Claim