Investigation of welded structures on mechanical properties of 304L welded tube-to-tubesheet joints |
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| Affiliation: | 1. Department of Materials Science and Engineering, Bandar Abbas Branch, Islamic Azad University, Bandar Abbas, Iran;2. Department of Materials Science and Engineering, Shiraz Branch, Islamic Azad University, Shiraz, Iran;1. University of Udine, Polytechnic Department of Engineering and Architecture, Via delle Scienze 208, 33100 Udine, Italy;2. Orion Spa, Via Giovanni e Sebastiano Caboto 8, 34170 Trieste, Italy;1. Graduate School of Engineering, Hiroshima University, Japan;2. Faculty of Naval Architecture and Ocean Engineering, Istanbul Technical University, Turkey;3. Faculty of Marine Science, Ordu University, Turkey;4. Department of Civil and Environmental Engineering, Tokyo Institute of Technology, Japan;5. National Maritime Research Institute, Japan;6. Graduate School of Science and Engineering, Ehime University, Japan;1. Graduate School of Engineering, Hiroshima University, Japan;2. Department of Engineering Mechanics, Hohai University, China;3. Department of Civil and Environmental Engineering, Tokyo Institute of Technology, Japan |
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| Abstract: | This paper presents an investigation on effects of welded structures on pullout force and fatigue life of welded joints of 304L heat exchanger tube-to-tubesheet. Welded structures including inner-hole with a groove of 45°, extension, inner-hole with a groove of U-shape and plain-end were discussed. Full-size test blocks covering four types of welded structures were used to conduct pullout test and low cycle fatigue test. Furthermore, optical microscopy (OM) and scanning electron microscopy (SEM) were utilized to analyze the failure mechanism. The results show that the joints of the extension welded structure have the largest pullout force and fatigue life because of its largest fracture length, and the undeformed welded zone revealed favorable quality of weld. The cracks originate at the outer surface of tube and striations propagate at an average rate of 50 μm for a loading cycle, finally, the separation commences at the inner surface of the tube, exhibiting equiaxed or hemispheroidal dimples. |
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| Keywords: | Welded structure Tube-to-tubesheet Pullout force test Fatigue life |
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