US 11,806,940 B2
Welding joining method and welding joined body
Youichiro Baba, Miyoshi (JP)
Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed by TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed on Dec. 15, 2021, as Appl. No. 17/551,347.
Application 17/551,347 is a division of application No. 17/028,076, filed on Sep. 22, 2020, granted, now 11,235,535.
Claims priority of application No. 2019-222893 (JP), filed on Dec. 10, 2019.
Prior Publication US 2022/0105690 A1, Apr. 7, 2022
Int. Cl. H05B 3/00 (2006.01); B29C 65/14 (2006.01); H05B 1/02 (2006.01); F16L 13/02 (2006.01); B29C 65/00 (2006.01); B29K 677/00 (2006.01)
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
OG exemplary drawing
 
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.