The invention discloses a cross sliding roof type
liner device for
pipe welding, and mainly aims to provide a
liner device capable of being applied to medium / small-
caliber pipe welding construction. The device is characterized by comprising a front support cylinder, a cross slide frame, small arc liners, large arc liners, a split slide way, a slide way blockage plate, a
dowel pin, a slide way screw, a nut, a slide way spring, a guide wheel base, a small guide wheel, a small pin shaft, a long connecting cylinder, a push-pull rod, a slide frame screw, a push-pull
handle, a wear reducing ring, alocking head, a locking spring and a fixed
handle, wherein four arc liners are adopted to replace multiple massive liners for blockage. The
liner device is smaller in radial size, can be applied to the small-
caliber pipe welding, is simpler in structure and more convenient to operate, can improve the welding efficiency, and in addition, can be provided with the guide wheels to achieve a pipe orifice aligning function.