BUTT FUSION MACHINE AND BUTT FUSION METHOD

摘要

PROBLEM TO BE SOLVED: To pass through a fused bead without bringing up a fused pipe material.SOLUTION: Provided is a butt fusion machine comprising: a fixed clamp made of the lower clamp 31 and the upper clamp freely rollably supported to the lower clamp 31 and connectable to the lower clamp 31; and a movable clamp made of the lower clamp and the upper clamp freely rollably supported to the lower clamp and connectable to the lower clamp, and supported freely movably to the axial direction of each pipe material, and a pair of the pipe materials are respectively sandwiched at set intervals via the fixed clamp 3 and the movable clamp, further, the marginal parts of a pair of the pipe materials are heated and melted via a heater, and are butted and fused. The lower clamp 31 of the fixed clamp freely detachably includes a semicircumferential ring-shaped supporting material 35 having the semicylindrical inner circumferential face 35b with an inside diameter corresponding to the outside diameter exceeding the outside diameter of fused beads and further having an outer circumferential taper face 35a of each pipe material whose tip is narrowed toward the moving direction of the pipe material Pn.