Title:
鋼材の溶接継手における熱影響部の靭性向上方法
Document Type and Number:
Japanese Patent JP4189201
Kind Code:
B2
Abstract:
A method of improvement of toughness of a heat affected zone in a multi-layer welded joint, a fillet welded joint, and a one-pass or several-pass large heat input welded joint of a steel plate is provided, that is, a method of improvement of toughness of a heat affected zone in a welded joint of a steel plate characterized subjecting a surface of a heat affected zone formed by a last pass of a multi-layer welded joint of a steel plate to impacts by an ultrasonic vibration tool or shot peening by ultrasonic vibration steel balls to thereby make an average of longitudinal axis of crystal grains up to a depth of 2 mm or more from the surface of the steel plate in the microstructure adjacent to a fusion line (FL) of a weld metal and a steel plate matrix in said heat affected zone formed by the last pass the equivalent of the crystal grain size of the steel plate matrix before the welding at a depth of 1/4 of a thickness t from the surface of the steel plate.
Inventors:
Chu Ishikawa
Kiyotaka Nakajima
Tetsuro Nose
Kiyotaka Nakajima
Tetsuro Nose
Application Number:
JP2002315396A
Publication Date:
December 03, 2008
Filing Date:
October 30, 2002
Export Citation:
Assignee:
Nippon Steel Corporation
International Classes:
B23K31/00; C21D7/06; B23K20/10; B23K33/00; C21D7/04; C21D10/00; C21D9/50
Domestic Patent References:
| JP1258856A | ||||
| JP9234585A | ||||
| JP7266230A | ||||
| JP2002200563A | ||||
| JP8174422A | ||||
| JP9010985A | ||||
| JP2004130316A | ||||
| JP3924235B2 | ||||
| JP3828855B2 | ||||
| JP3820208B2 | ||||
| JP10193164A | ||||
| JP3162518A | ||||
| JP2002166364A | ||||
| JP2002213253A | ||||
| JP8253821A |
Foreign References:
| US6171415 |
Attorney, Agent or Firm:
Etsuichi Matsumoto
Shiina Akira
Shiina Akira