WELDING STRUCTURE FOR NOZZLE STUB

PROBLEM TO BE SOLVED: To provide a welding structure for a nozzle stub, which can stop or delay the progress of a creep crack appearing in a stress concentration zone of a welded part.SOLUTION: In an area of a heat-affected zone 5 formed in a boundary part between a header 3 and a weld metal layer 4...

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Bibliographische Detailangaben
1. Verfasser:	HASHIMOTO MASAMITSU
Format:	Patent
Sprache:	eng ; jpn
Schlagworte:	BLASTING CLADDING OR PLATING BY SOLDERING OR WELDING CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING JOINTS OR FITTINGS FOR PIPES LIGHTING MACHINE TOOLS MEANS FOR THERMAL INSULATION IN GENERAL MECHANICAL ENGINEERING METAL-WORKING NOT OTHERWISE PROVIDED FOR METHODS OF STEAM GENERATION PERFORMING OPERATIONS PIPES SOLDERING OR UNSOLDERING STEAM BOILERS STEAM GENERATION SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING THERMAL INSULATION IN GENERAL TRANSPORTING WEAPONS WELDING WORKING BY LASER BEAM
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a welding structure for a nozzle stub, which can stop or delay the progress of a creep crack appearing in a stress concentration zone of a welded part.SOLUTION: In an area of a heat-affected zone 5 formed in a boundary part between a header 3 and a weld metal layer 4 by fillet welding, at least first and second bent parts 11a and 11b are provided in a midway part at an outside opening end of a countersunk hole 14 from a bottom surface 16 of the countersunk hole 14, and a parallel part 17 extended almost in parallel with an outer peripheral surface of the header 3 is preformed between the first and second bent parts 11a and 11b. 【課題】溶接部の応力集中部に発生したクリープ亀裂の進展を停止あるいは遅らせることのできる管台の溶接構造を提供する。【解決手段】隅肉溶接により母管３と溶接金属層４の境界部に形成される熱影響部５の領域内で、座繰り穴１４の底面１６から座繰り穴１４の外側開口端の途中部分に、少なくとも第１の屈曲部１１ａと、第２の屈曲部１１ｂを設けて、第１の屈曲部１１ａと第２の屈曲部１１ｂの間に母管３の外周面と略平行に延びた平行部１７が予め形成されていることを特徴とする。【選択図】図２