| 摘要 |
PCT No. PCT/JP97/02532 Sec. 371 Date Mar. 19, 1998 Sec. 102(e) Date Mar. 19, 1998 PCT Filed Jul. 22, 1997 PCT Pub. No. WO98/03294 PCT Pub. Date Jan. 29, 1998A control system of a welding robot for performing realtime tracking using a laser sensor in which a welding operation in passing a tack welded portion is rationally coped with. An arc welding torch and a laser sensor LS are mounted on a robot hand. A tool center point is set to coincide with an aimed position of a distal end of a welding wire. The tool center point is positioned at an advancing end of a formed bead B and immediately before a tack welded portion A1. The tool center point 4 is also positioned on a welding reference line (P1-> . . . ->P6). A bright line 5 is formed between points 51 and 52 by a laser beam emitted from the laser sensor LS with a deflection range SC. A detected point SA is positioned at an edge of the tack welded portion A1 on the bright line 5 (there may be found no detected point). A deviation of the detected point SA from the proper welding reference line is determined based on a direction of a robot path immediately before the detected point. In such case, a detection substitutive point Q is determined based on the robot path immediately before the detected point and the TCP is moved toward the determined point. Detection substitutive points following the point Q are successively determined until the tack welded portion A1 has been passed, and the robot follows a path along a series of the detection substitutive points.
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