A slag removal apparatus for removing slag from support plates provided to support an object to be processed in a cutting machine is disclosed. The slag removal apparatus includes a scraper including a plurality of blades around an outer surface of a bar crossing the support plates, and a plurality of slots formed in the respective blades along a length direction and thus formed around the bar and in a length direction of the bar, a rotation support unit to which the scraper is rotatably installed, a rotation driving unit rotating the scraper from the rotation support unit to remove slag attached to the support plates by the blades, when the support plates are inserted into the slots, a lifting unit lowering the scraper, for insertion of the support plates into the slots and raising the scraper to an original position by raising and lowering the rotation support unit, and a first transfer unit moving the rotation support unit along a length direction of the support plates to allow the scraper to remove the slag along the length direction of the support plates.

A slag removal apparatus for removing slag from support plates provided to support an object to be processed in a cutting machine is disclosed. The slag removal apparatus includes a scraper including a plurality of blades around an outer surface of a bar crossing the support plates, and a plurality of slots formed in the respective blades along a length direction and thus formed around the bar and in a length direction of the bar, a rotation support unit to which the scraper is rotatably installed, a rotation driving unit rotating the scraper from the rotation support unit to remove slag attached to the support plates by the blades, when the support plates are inserted into the slots, a lifting unit lowering the scraper, for insertion of the support plates into the slots and raising the scraper to an original position by raising and lowering the rotation support unit, and a first transfer unit moving the rotation support unit along a length direction of the support plates to allow the scraper to remove the slag along the length direction of the support plates.

An object is to prolong the life of a ring tool, and improve the productivity of a welded pipe. A ring tool unit is held in a downstream-side end portion of a mandrel to be inserted into a welded pipe currently being manufactured from the upstream side of a welding position, and is used as a cutting tool for continuously cutting a bead produced on the inner surface of the welded pipe, wherein the ring tool unit is formed by fitting a ring tool having a ring-like blade in a sleeve having a circular hole for holding the outer circumference of the ring tool.

A weld cutting machine having a first cutting jaw part (4) and a second cutting jaw part (5), a base frame (500) having fixedly attached thereto the second cutting jaw part (5), a power unit and a transmission mechanism (3). The power unit is connected to the transmission mechanism (3) to arrange for movement of at least one of the first cutting jaw part or the second cutting jaw part (4, 5).

A weld cutting machine having a first cutting jaw part (4) and a second cutting jaw part (5), a base frame (500) having fixedly attached thereto the second cutting jaw part (5), a power unit and a transmission mechanism (3). The power unit is connected to the transmission mechanism (3) to arrange for movement of at least one of the first cutting jaw part or the second cutting jaw part (4, 5).