Patent ID: 8881355

Claim:
A repair device that repairs a welded part on an inner peripheral side of a pipe, comprising: a casing; a slide shaft slidably arranged with respect to the casing so as to slide within the casing along a slide axis; a turn table mechanism including a turn table and a rotating shaft, wherein the rotating shaft is rotatably arranged within the slide shaft so as to rotate with respect to the slide shaft about a rotation axis that extends through the slide shaft, in order to rotate the turn table about the rotation axis; a cutting mechanism installed on the turn table and including a cutting tool for cutting the welded part; and an advancing and retracting mechanism that displaces the cutting tool in a radial direction with respect to the rotation axis of the turn table radially outwardly and radially inwardly by displacing the cutting mechanism radially outwardly and radially inwardly, wherein in a state where the casing is positioned within the pipe and clamped within the pipe via a clamp mechanism, the turn table is rotationally displaced about the rotation axis while the slide shaft slides in the direction of the slide axis, and the advancing and retracting mechanism displaces the cutting tool radially outwardly and radially inwardly with respect to the rotation axis, so that the cutting tool moves along a helical path along an inner peripheral shape of the pipe to cut an inner periphery of the pipe.