Invention Grant
- Patent Title: Boom and arm member of construction machine excellent in weld zone fatigue strength and method of improvement of its fatigue strength
- Patent Title (中): 施工机械臂和臂构件焊接区疲劳强度优异，疲劳强度提高的方法
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Application No.: US11631100Application Date: 2005-07-14
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Publication No.: US08146794B2Publication Date: 2012-04-03
- Inventor: Tetsuro Nose , Kiyotaka Nakashima
- Applicant: Tetsuro Nose , Kiyotaka Nakashima
- Applicant Address: JP Tokyo
- Assignee: Nippon Steel Corporation
- Current Assignee: Nippon Steel Corporation
- Current Assignee Address: JP Tokyo
- Agency: Kenyon & Kenyon LLP
- Priority: JP2004-208329 20040715
- International Application: PCT/JP2005/013431 WO 20050714
- International Announcement: WO2006/006738 WO 20060119
- Main IPC: B23K20/00
- IPC: B23K20/00
Abstract:
The present invention provides a boom and arm member of a construction machine excellent in weld zone fatigue strength and a method of improvement of its fatigue strength, that is, a boom and arm member of a construction machine superior in weld zone fatigue strength, the boom and arm member of a construction machine characterized in that toes of full penetrated weld zones of the boom and arm member have vibration strike marks, and a method of improvement of its fatigue strength. Preferably, the residual stress of the bottom surface of the vibration strike marks is a 10 MPa or higher compressive residual stress.
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