METHOD FOR IMPROVING RESIDUAL STRESS OF DOUBLE METAL PIPE AND THE LIKE

PURPOSE:To improve the efficiency in treating an improvement by heating one side of the base pipe wall at the position separated from the center of a thermal sleeve base part and regulating the distance between the heating center and base part center in a specific range. CONSTITUTION:A cooling nozzl...

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Bibliographische Detailangaben
Hauptverfasser:	FURUYA SHUJI, UMEMOTO TADAHIRO
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:	PURPOSE:To improve the efficiency in treating an improvement by heating one side of the base pipe wall at the position separated from the center of a thermal sleeve base part and regulating the distance between the heating center and base part center in a specific range. CONSTITUTION:A cooling nozzle 9 is provided at the cylindrical hollow part 6 between a base pipe 4 and thermal sleeve 5 anx a heating means 10 is arranged at the outside of the base pipe 4 located at the position separated from the base part center of the sleeve 5 as well. In this case, the separation distance of the heating center and sleeve base part center is set two times or three times the half width of a heating range. A cooling water is filled up inside a double metal pipe together with the space part 6 to heat one side of the base pipe 4 with the actuation of the heating means 10. After generation of the stress exceeding a yield point at the base part of the sleeve 5 the heating is stopped and cooling is performed, then a plastic deformation part is restored to caused a residual compression stress. The improvement treatment efficiency of the residual stress is improved with the simplification of the treatment.