| 摘要 |
Apparatus for tracking a welding groove to guide a welding apparatus therealong, including one tracking wheel which has a narrow circumferential edge for engaging in an open welding groove, and another tracking wheel which has a circumferential groove for engaging about a weld bead. The two wheels are firmly connected together, so that while the narrow edged wheel is tracking an open groove, the grooved wheel may be rolling along the open groove of straddling a weld bead, and so that while the grooved wheel is straddling a weld bead the narrow edged wheel may be rolling along the top of the bead. The tracking apparatus will follow a welding groove whether or not there is a weld bead formed therein. |
