Boom and arm member of construction machine excellent in weld zone fatigue strength and method of improvement of its fatigue strength
US8146794B2 · kind B2 · utility
1Cited by
64References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 14, 2005 |
| Grant date | Apr 3, 2012 |
| Priority date | — |
| Expiry date | Jul 4, 2028 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25D2250/291
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.