| 摘要 |
The present invention relates to a guide rail apparatus for welding carriage for stopping up an access hole which comprises: a plurality of split rails (210, 210a) split from split rail rack gears (211), which are mutually connected to form a guide rail unit; and a plurality of connecting rail tubes (230) forming connecting rail tube gears (231) which connect the end parts of the split rails (210, 210a). In order to perform automatic welding onto access holes having various sizes, the guide rail apparatus comprises an assembly rail, which is variable in the length and shape. |
