Development of the Residual Stress Improvement Method for Small-Diameter Butt-Welding Pipe (Improvement of Residual Stress through Application of Freezing Process)
| Autor: | Yuka Fukuda, Satoru Aoike, Masaki Tsuruki, Shinobu Ookido, Naohiko Oritani |
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| Rok vydání: | 2011 |
| Předmět: |
Quenching
Yield (engineering) Materials science Piping business.industry Mechanical Engineering Butt welding technology industry and agriculture Structural engineering respiratory system law.invention Magazine Mechanics of Materials Residual stress law Ultimate tensile strength General Materials Science Stress corrosion cracking Composite material business |
| Zdroj: | TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A. 77:1144-1155 |
| ISSN: | 1884-8338 0387-5008 |
| Popis: | To prevent stress corrosion cracking (SCC) initiation at the inner surface of the butt-welding region of a small-diameter pipe, a residual stress improvement method has been developed. In this method, the butt-welding region is heated up to 325 degrees centigrade in air. After heating, a water quenching process is applied to the inner surface of the butt-welding region. During a water quenching process, a large thermal stress is generated by the temperature difference between inner and outer surfaces. When a thermal stress exceeds the yield stress of piping material, a tensile yield is generated at the inner surface of the butt-welding region. Because a tensile yield changes into a compressive residual stress, a compressive residual stress can be introduced at the inner surface of the butt-welding region after application of this method. In this study, residual stresses at the inner surface of the butt-welding region were measured. The measured residual stresses proved this method effectively reduces residual stresses and prevents SCC initiation. |
| Databáze: | OpenAIRE |
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