LASER PEENING TREATMENT METHOD

PROBLEM TO BE SOLVED: To provide a laser peening treatment method for improving fatigue property more than the conventional methods in an environment where repeated loads act on a weld toe portion of a weld structure and a plastic deformation region of a formed product by effectively introducing com...

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Bibliographische Detailangaben
Hauptverfasser:	HIRANO KOJI, SUGIBASHI ATSUSHI, SUZUKI TAMAKI
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY CLADDING OR PLATING BY SOLDERING OR WELDING CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS MACHINE TOOLS MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS METAL-WORKING NOT OTHERWISE PROVIDED FOR METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS PERFORMING OPERATIONS SOLDERING OR UNSOLDERING TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE TRANSPORTING WELDING WORKING BY LASER BEAM
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a laser peening treatment method for improving fatigue property more than the conventional methods in an environment where repeated loads act on a weld toe portion of a weld structure and a plastic deformation region of a formed product by effectively introducing compressive residual stress into these portions.SOLUTION: In the laser peening treatment method, a pulsed laser beam is irradiated on a surface of a material to be treated via a laser medium after being converged and the compressive residual stress is formed in the neighborhood of the irradiated spot of the surface. In the method, the pulsed laser beam scans the surface of the material in such a manner that overlay ratio of the neighboring irradiated spots is within the range of 92 to 99 area% in the direction (X direction) perpendicular to the direction (Y direction) to which the preliminarily assumed repeated load is applied.