US 12,280,447 B2
Crack repair method for existing steel structure
Daiki Okita, Tokyo (JP); Naoyuki Matsumoto, Tokyo (JP); and Koutarou Inose, Tokyo (JP)
Assigned to IHI CORPORATION, Tokyo (JP)
Filed by IHI CORPORATION, Tokyo (JP)
Filed on Sep. 1, 2021, as Appl. No. 17/463,858.
Application 17/463,858 is a continuation of application No. PCT/JP2020/012712, filed on Mar. 23, 2020.
Claims priority of application No. 2019-068100 (JP), filed on Mar. 29, 2019.
Prior Publication US 2021/0402519 A1, Dec. 30, 2021
Int. Cl. B23K 26/342 (2014.01); E01D 22/00 (2006.01); E04G 23/02 (2006.01)
CPC B23K 26/342 (2015.10) [E01D 22/00 (2013.01); E04G 23/0203 (2013.01)] 2 Claims
OG exemplary drawing
 
1. A crack repair method for an existing steel structure that repairs a crack generated in the existing steel structure by using a filler material, the crack repair method comprising:
a build-up welding step of performing build-up welding by arc welding or laser welding using the filler material on the crack generated in the existing steel structure to form a filler material build-up portion; and
a laser beam piercing welding step of performing piercing welding by irradiating the filler material build-up portion with a laser beam such that a welding-repaired portion, in which the filler material build-up portion is melted, is formed around the crack.