| 摘要 |
On conventional method of surfacing the interior of a pipe employing arc welding techniques is to apply a series of annular weld strips to the pipe. A simpler, more efficient method is to apply longitudinally extending strips to the interior of the pipe, while rotating the pipe between each welding metal application. A device for effecting this method includes an elongated casing formed of insulating material extending between a block at one end and a crescent-shaped plug at the other end, a rigid tube extending between the block and the plug, a tube coaxial with the rigid tube extending through the block and the rigid tube into the plug, the last mentioned tube carrying a plastic conduit through which a welding wire is inserted into a tip extending outwardly from the outer free end of the plug, coolant inlet and outlets in the casing, a flux inlet in the block end of the casing for carrying welding flux to an outlet beneath the plug, and a guide extending downwardly from the casing for guiding the device while it is drawn through a pipe during application of a weld strip to the pipe interior.
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