CPC B29C 65/1416 (2013.01) [B29C 65/1432 (2013.01); B29C 66/5221 (2013.01); B29C 66/71 (2013.01); B29C 66/91411 (2013.01); B29C 66/91443 (2013.01); F16L 13/02 (2013.01); H05B 1/023 (2013.01); H05B 3/0057 (2013.01); B29K 2677/00 (2013.01); B29K 2995/0041 (2013.01)] | 2 Claims |
1. A welding joined body including a joined portion obtained by bonding, by pressure, end portions of tubular members made of crystalline resin to each other in a molten state, wherein:
a weld bead remains in a vicinity of the joined portion and in a shape folded onto an inner peripheral surface of one of the tubular members from a root of the weld bead, the weld bead being discharged from the joined portion in pressure bonding such that the weld bead projects inwardly in a tubular radial direction and falls down toward the one of the tubular members;
a rate of change in crystallinity in the tubular radial direction in a belt-shaped predetermined region extending outwardly in the tubular radial direction when the predetermined region is viewed in a circumferential direction is a predetermined value or less, the predetermined region being set in a corresponding one of the tubular members so as to start from a boundary portion between the weld bead and the inner peripheral surface of the corresponding one of the tubular members.
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