Abstract: Apparatus for machining the ends of pipe, which has a clamping section insertable into a section of pipe for forcible engagement with the interior of the pipe in fixed coaxial alignment therewith and a cutting section which includes a cylindrical mast, attached to the clamping section for coaxial alignment therewith, and a cutting head assembly on which is carried one or more cutting tools. The cutting head assembly is mounted on the mast for rotation and axial movement relative thereto for moving cutting tools into and away from cutting engagement with an end of the pipe section. The apparatus cutting section mast is removably attached to the clamping section allowing removal and replacement of the clamping section.

Abstract: Apparatus for end-to-end alignment of first and second sections of pipe for the welding together thereof including a frame assembly carrying independently expandable and retractable first and second axially spaced clamps for engagement and disengagement with the interior walls of said pipe sections. The frame assembly also carries a drive assembly by which the apparatus is propelled through said pipe sections and a brake assembly to slow or stop movement of the apparatus therein. Controls are connected to the clamps, the drive assembly and the brake assembly which are responsive to sensing of the end of the first pipe section by a sensor to deactivate the drive assembly, activate the brake assembly, arrest movement of the apparatus and, upon predetermined alignment, to activate the first clamp and finally the second clamp for engagement with the walls of the pipe sections.