| 摘要 |
<p>PURPOSE: To reduce the melting amt. of a pipe end part as compared with a conventional method and to suppress the protruding height of an inner surface bead low at the time of abutting by forming a heater heating and melting both pipe end parts of a pair of pipe materials in a non-contact state into a structure emitting infrared rays in specific emissivity. CONSTITUTION: Pipe materials 11, 12 are fixed to respective clamps 1, 2 and a heater 3 is subsequently arranged between the pipe materials 11, 12. The pipe end parts of both pipe materials are melted by non-contact heating and, after the heater 3 is removed from the space between the pipe materials, a pair of the clamps 1, 2 are relatively moved to butt the pipe end surfaces 11a, 12a of the pipe materials 11, 12 each other under predetermined bonding load to weld them. The hot plate 3a of the heater 3 is made of aluminum and the surfaces S1, S2 thereof are uniformly coated with a far infrared emitting material 3b emitting infrared rays with a wavelength of 5μm or more in emissivity of 80% or more.</p> |
