US 11,865,640 B2
Concentric cylindrical member pair welding method and welding device thereof
Noritsugu Kato, Kariya (JP); Shigeyuki Kusano, Kariya (JP); Yuki Kato, Kariya (JP); and Tsuyoshi Hayakawa, Kariya (JP)
Assigned to DENSO CORPORATION, Kariya (JP)
Filed by DENSO CORPORATION, Kariya (JP)
Filed on Nov. 3, 2020, as Appl. No. 17/087,958.
Application 17/087,958 is a continuation of application No. PCT/JP2019/012514, filed on Mar. 25, 2019.
Claims priority of application No. 2018-092004 (JP), filed on May 11, 2018.
Prior Publication US 2021/0069828 A1, Mar. 11, 2021
Int. Cl. B23K 26/28 (2014.01); B23K 26/082 (2014.01); B23K 26/06 (2014.01); B23K 26/067 (2006.01); F02M 61/16 (2006.01)
CPC B23K 26/28 (2013.01) [B23K 26/0626 (2013.01); B23K 26/0676 (2013.01); B23K 26/082 (2015.10); F02M 61/168 (2013.01); F02M 2200/8084 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A welding method for circumferentially melting and welding a cylindrical member pair in which another cylindrical member is inserted inside a cylindrical member, comprising:
a rotation welding step that relatively rotates an applying unit which applies energy for melting and welding the cylindrical member pair and the cylindrical member pair around an axis of the cylindrical member pair, and applies the energy from the applying unit to the cylindrical member pair to rotate an irradiation part of the energy applied from the applying unit around the axis; and
an adjusting step that adjusts the amount of energy applied to the cylindrical member pair from the applying unit in association with a rotation angle of the cylindrical member pair around the axis, wherein
in the adjusting step,
the adjustment of the amount of energy in a specific applying unit which is at least one of the applying units arranged in two or more locations in a circumferential direction of the cylindrical member pair is executed in association with a rotation angle to satisfy a relationship of Pd+Pw>θ, wherein Pd is an output decease rotation angle that decreases the energy amount from a steady energy amount HP applied from the specific applying unit in a welding end process, Pw is an overlap rotation angle at which the irradiation parts around the cylindrical member pair overlap with the steady energy amount HP, and θ is a separation angle between the specific applying unit and another applying unit adjacent to each other in a rotation direction around the axis.