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Patent Searching and Data


Title:
LASER WELDING METHOD FOR REPAIR, AND LASER WELDING DEVICE FOR REPAIR
Document Type and Number:
WIPO Patent Application WO/2019/208270
Kind Code:
A1
Abstract:
This laser welding device for repair is provided with a laser oscillator 2, a laser head 4 which condenses laser light L from the laser oscillator 2 to irradiate a repair site, a temperature sensor which detects a temperature distribution in a steel material W irradiated by the laser light L, and a control unit 9, wherein the control unit 9 sets a spot diameter φ of the laser light L irradiated from the laser head 4 to be less than 3 mm, moves the laser head 4 to enlarge a heat input region resulting from the irradiation of the steel material W by the laser light L, in such a way that a crack Wa is kept inside the heat input region, and controls the laser head 4 to cause the irradiation of the laser light L for enlarging the heat input region to be performed with respect to a site, detected by the temperature sensor, equal to or less than a mechanical melting temperature of the steel material W. This makes it possible to reduce the required laser output and to perform high speed machining, and to eliminate cracks easily and reliably without causing burn-through, even with a downward-facing welding attitude.

Inventors:
INOSE Koutarou (1-1 Toyosu 3-chome, Koto-k, Tokyo 10, 〒1358710, JP)
MATSUMOTO Naoyuki (1-1 Toyosu 3-chome, Koto-k, Tokyo 10, 〒1358710, JP)
OKITA Daiki (1-1 Toyosu 3-chome, Koto-k, Tokyo 10, 〒1358710, JP)
Application Number:
JP2019/016008
Publication Date:
October 31, 2019
Filing Date:
April 12, 2019
Export Citation:
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Assignee:
IHI CORPORATION (1-1 Toyosu 3-chome, Koto-ku Tokyo, 10, 〒1358710, JP)
International Classes:
B23K26/34; B23K26/00; B23K26/073
Foreign References:
JPH0688120A1994-03-29
US7094988B12006-08-22
JP2015024440A2015-02-05
JPH03169494A1991-07-23
JPH06335792A1994-12-06
US20140197143A12014-07-17
US6341936B12002-01-29
Attorney, Agent or Firm:
NAGATO Kanji (5F Hyakuraku Bldg, 8-1 Shinbashi 5-chome, Minato-k, Tokyo 04, 〒1050004, JP)
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