Method for reduction and sizing of welded pipes and mill for effecting same

摘要

Disclosure is made of a process for reduction and sizing of welded pipes, whereby a pipe is reduced in diameter in passes formed by rolls of alternating horizontal and vertical stands. The weld zone is deformed by portions of roll passes of an equal curvature. Disclosure is further made of a mill for effecting the above method, which comprises alternating horizontal and vertical stands with rolls whose working surface is defined by arcs of at least two radii. The radius of at least one of said arcs is equal to the radius of the roll welding pass. The apices of said arcs of an equal radius are in the same plane extending through the longitudinal axis of the mill and on the line of motion of the weld.