Abstract: A method of treating steel pipe made by forming and welding a mother plate. The pipe is shrunk in the radial direction by applying compressive radial pressure to the outside surface of the pipe to reduce the pipe diameter by at least about 1%. The shrinking of the pipe increases the circumferential compressive yield strength and decreases the circumferential tensile yield strength. The pipe is then heated to a temperature below the transformation temperature of the steel but high enough to increase the circumferential tensile yield strength of the pipe, preferably at least about 15% above the tensile yield strength of the mother plate. The heating step does not significantly decrease the high circumferential compressive yield strength of the pipe. The pipe is preferably heated to a temperature within the range of from about 500.degree. F to about 1000.degree. F, and the preferred heating technique is induction heating.

Abstract: Apparatus for milling the end edge surfaces of truck rims to remove weld projections including a frame having a clamping means for holding the rim in an operating station, a pair of spaced apart power heads carrying cutting tools and actuator means for moving the power heads and cutting tools at a predetermined spaced apart distance transversely with respect to the axis of the rim to remove the weld projections. The upper power head and cutting tool are mounted for vertical movement and stop means carried by the upper power head directly locates the spaced apart position for the upper cutter to remove the top weld projection on the rim.