Title:
WELDING EQUIPMENT FOR REALIZING LOW RESIDUAL STRESS
Document Type and Number:
Japanese Patent JP3833069
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a welding method and a welding equipment for realizing low residual stress in which the thermal efficiency and the mechanical efficiency necessary for converting the tensile residual stress in the surface of a weld part into the compressive stress, and the cost can be sufficiently reduced.
SOLUTION: Transitional temperature difference between a surface layer of a base metal and a part immediately below the surface layer is generated in the surface area of a base metal 50 in the tensile stress state by spraying cooling liquid from a spray nozzle 11 and cooling the surface area heated by the heat input from the weld part when performing the welding by a welding rod 31. The tensile stress is generated in the surface layer to generate the tensile strain, and the surface layer is partially yielded. Next, by stopping the cooling, the thermal stress is eliminated. The deformation of the surface of the weld part is elastically returned from the partially yielded state, and the tensile stress is improved in a mitigated state or changed into the compressive residual stress.
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Inventors:
Yanagita Nobuyoshi
Kunio Enomoto
Anzai Hideya
Koshiishi Masato
Sadato Shimizu
Hiroshi Tsujimura
Kunio Enomoto
Anzai Hideya
Koshiishi Masato
Sadato Shimizu
Hiroshi Tsujimura
Application Number:
JP2001029795A
Publication Date:
October 11, 2006
Filing Date:
February 06, 2001
Export Citation:
Assignee:
株式会社日立製作所
International Classes:
B21D1/00; B23K31/00; B23K9/32; B23K37/00; (IPC1-7): B23K31/00; B23K37/00; //B21D1/00
Domestic Patent References:
| JP2000343270A |
Attorney, Agent or Firm:
Ichiro Suzuki
Kenjiro Take
Kenjiro Take
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