Repairing laser welding method and repairing laser welding device
AssigneesIhi Infrastructure Systems Co., Ltd., IHI Corporation
InventorsNaoyuki Matsumoto, Yoshihiko Nakamura, Shinya Osawa, Koutarou Inose, Junko Yamada, Daiki Okita, Akira Katou
Life of this patent
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Abstract
Irradiation with a laser beam is performed along a welding bead, while the laser beam is aimed, as an irradiation point of the laser beam, at a contact point between a deck plate and a U-rib that is contained in a non-welded portion of a root part, from a side of the welding bead of the root part. Thereby, it is possible to remove a crack beginning at the non-welded portion of the root part generated at a joining portion between the deck plate and the U-rib of a steel floor slab, by the irradiation with the laser beam.
Claims20
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.
Dependencies are inferred from the claim text.