US 12,459,057 B2
Repairing laser welding method and repairing laser welding device
Naoyuki Matsumoto, Tokyo (JP); Yoshihiko Nakamura, Sakai (JP); Shinya Osawa, Sakai (JP); Koutarou Inose, Tokyo (JP); Junko Yamada, Tokyo (JP); Daiki Okita, Tokyo (JP); and Akira Katou, Tokyo (JP)
Assigned to IHI INFRASTRUCTURE SYSTEMS CO., LTD., Sakai (JP); and IHI CORPORATION, Tokyo (JP)
Filed by IHI INFRASTRUCTURE SYSTEMS CO., LTD., Sakai (JP); and IHI CORPORATION, Tokyo (JP)
Filed on Dec. 28, 2021, as Appl. No. 17/563,181.
Application 17/563,181 is a continuation of application No. PCT/JP2020/028349, filed on Jul. 22, 2020.
Claims priority of application No. 2019-136084 (JP), filed on Jul. 24, 2019.
Prior Publication US 2022/0118552 A1, Apr. 21, 2022
Int. Cl. B23K 26/342 (2014.01); B23K 26/073 (2006.01); B23K 26/08 (2014.01); E01D 22/00 (2006.01)
CPC B23K 26/342 (2015.10) [B23K 26/073 (2013.01); B23K 26/0876 (2013.01); E01D 22/00 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A repairing laser welding device that melts and eliminates a crack by irradiation with a laser beam, the crack being generated beginning at a non-welded portion of a root part between a first welded material and a second welded material obliquely joined to a surface of the first welded material by fillet welding, the repairing laser welding device comprising:
a laser oscillator;
a laser head that performs irradiation with the laser beam supplied from the laser oscillator;
a head drive mechanism that moves the laser head along a welding bead at the root part; and
a tracing mechanism that causes an irradiation point of the laser beam to trace a contact point between the first welded material and the second welded material, the laser beam being emitted from the laser head that is moved along the welding bead by the head drive mechanism, the contact point being contained in the non-welded portion of the root part, the tracing mechanism comprising:
two tracing legs disposed at the laser head, each including a roller at their respective distal end and pressed against a downward-facing surface of the first welded material and a side edge of the second welded material, respectively.