Patent ID: 7143673

Claim:
A rotary milling head for a rotary milling tool, comprising: a cylindrical milling head body having an annular recess adapted to accept an end of a metal tube, said milling head body adapted to be connected to the rotary milling tool; one or more cutting blades connected to said milling head body by a securing element, each said blade disposed circumferentially around the rotational axis of the milling head and the annular recess, each said blade having one or more cutting edges including a lower cuffing edge, said one or more cutting edges defining an annular cutting sweep having an inner radius and an outer radius greater than an outer diameter of the tube, said cutting sweep adapted to remove from about 2% to about 25% of an outer radial thickness of the tube and any weld overlay and membrane present on said tube within said annular cutting sweep, wherein said lower cutting edge extends below a lower end of said milling head body, and wherein said blade has a face surface with a bore extending therethrough through so that said securing element connects said blade to said milling head body, said blade having a countersink around said bore and receiving at least a portion of a head of said securing element.