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Boom/arm member for construction machine, having high welded portion fatigue strength, and method of improving the fatigue strength
Boom/arm member for construction machine, having high welded portion fatigue strength, and method of improving the fatigue strength
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机译:具有高焊接部分疲劳强度的用于工程机械的动臂/臂构件以及提高疲劳强度的方法
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摘要
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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