MANUFACTURE OR RAMIFIED PIPE JOINT

摘要

PURPOSE:To provide a manufacture of a ramified pipe joint which can manufacture a ramified pipe joint having a favorable appearance and stable fusing strength. CONSTITUTION:After performance of a main pipe manufacturing process forming a ramified hole 11 having a trough 111 on a little shallower position than a depth arriving at the center of a main pipe 1 by cutting a pipe wall of the main pipe 1 from two directions meeting at right angles with each other and a branch pipe manufacturing process forming a crest part 21 having the peaks 211 at two positions of the circumference of a branch pipe 2 separated almost 180 degrees from each other by cutting an end part of the branch pipe 2 formed in the same diameter as that of the main pipe 1 from two directions meeting at right angles from each other, a heating and melting process melting the fringe of the ramified hole 11 and an end fringe of the crest part 21 by heating them is performed. Then after the heating and melting process, welding process welding the fringe of the ramified hole 11 and the end fringe of the crest part 21 to each other by applying fixed pressure to them in the direction fitting them each other is performed.