PORTABLE MACHINE TOOL FOR CONDITIONING HEADER TUBE OPENINGS FOR BUTT-WELDING TUBES

摘要

A portable machine tool (10) includes a mandrel (22) that may be locked within the tube opening and a plurality of stabilizing legs (24, 26, 28) extending between the mandrel (22) and the header for stabilizing the mandrel (22) during operation. A cutting head (64) is mounted concentrically on the mandrel (22) and is advanced into engagement with the stub end of a heat exchange tube and its opening to remove the stub end and prepare the opening for welding the new tube thereon.