| 摘要 |
The present invention provides an overlay welding device which is capable of welding a pipe with a small diameter at once regardless of length of the pipe and which comprises a pipe having an inner circumferential surface formed therein; a supporting wire passing through the inner circumferential surface of the pipe and having tension applied to one side thereof; and a welding unit provided to move along the supporting wire, welding the inner circumferential surface of the pipe along the wire. |
