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Study On Distortion Control In Nozzle Welding Of Stainless Steel Pressure Vessels
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Book Synopsis Study on Distortion Control in Nozzle Welding of Stainless Steel Pressure Vessels by : Jinning Peng
Download or read book Study on Distortion Control in Nozzle Welding of Stainless Steel Pressure Vessels written by Jinning Peng and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The welding of austenite stainless steel often results in large amount of welding distortion due to its high thermal expansion coefficient and low thermal conductivity. This has created great difficulty in the dimensional control of the welded stainless steel structure, ending up with high manufacturing cost. Researches on the welding distortion of stainless steels were very limited, especially for large weld structures with complex component shapes. The studies of this thesis were initiated with focus on the stainless steel nozzle-to-shell-can weld structures, a very typical structural configuration for pressure vessels used in petrochemical and nuclear power generation industries. Both the experimental and the FEA (finite element analysis), i.e. computational simulation, approaches were taken in the studies which addressed the influences of the welding fixture, the welding sequence, and the welding process on the distortion caused by stainless steel nozzle-to-shell welding. The investigations employed single and multi-nozzle weld test models (called mockups in the thesis) or FEA models. Manual GTAW (gas tungsten arc welding) and SMAW (shielded metal arc welding) processes were selected to represent the most common practice for stainless steel nozzle welding. The FEA simulations were conducted with ABAQUS program using sequentially coupled transient analysis method with lumped weld passes to achieve high computing efficiency. The investigations on the effect of the welding fixture concluded that the contour fixtures introduced in the thesis be effective for reducing the welding distortion for both the single and the multi-nozzle welding. The contour fixtures tend to localize the welding distortion, hence yield less impact on the global distortion of the whole weld structure. The rib-bar fixture, a more common fixture type for multi-nozzle welding, was found resulting in a big jump in the shell plate distortion when the fixture was removed. The studies on the influence of the welding sequence revealed that a progressive approach was more favorable for distortion control under the given nozzle-to-shell weld structure configurations. The best sequence suggested is to start welding at one nozzle, firstly on shell OD (outside diameter) side then on ID (inside diameter) side, then proceed to next neighboring nozzle. The effect of the welding direction of each weld pass was found affecting only the nozzle angular distortion. The experimental data showed that the manual GTAW process developed much higher shell plate distortion than the SMAW process. The reason would be that a higher percentage of the welding heat had been consumed on the base metal. The influence of the weld bead size didn't appear to be significant. In the FEA study on the effect of the size of the lumped weld pass, the increase in weld bead size even resulted in a decrease in weld distortion. From the FEA simulation point of view, using large lumped pass would be a highly efficient choice without compromising too much in the precision of the distortion prediction. The FEA study confirmed that a decrease in cooling time after welding would result in more welding distortion. The large scale multi-nozzle mockup with rib-bar fixture demonstrated a maximum out-of-plane shell distortion of 16.4mm after the welding of 10 nozzles with GTAW+SMAW process, which suggests that additional measures should be developed to further control the welding distortion.
Book Synopsis Analysis of Residual Stresses and Distortions Resulting from Multi-pass Welding of Nozzles to Cylindrical Pressure Vessels by : Mthobisi Zondi
Download or read book Analysis of Residual Stresses and Distortions Resulting from Multi-pass Welding of Nozzles to Cylindrical Pressure Vessels written by Mthobisi Zondi and published by . This book was released on 2012 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Investigation of Stresses in Nozzles in Cylindrical Pressure Vessels by : D. E. Hardenbergh
Download or read book Experimental Investigation of Stresses in Nozzles in Cylindrical Pressure Vessels written by D. E. Hardenbergh and published by . This book was released on 1963 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Control of Distortion in Welded Fabrications by : Institute of Welding
Download or read book Control of Distortion in Welded Fabrications written by Institute of Welding and published by Woodhead Publishing Limited. This book was released on 1968 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Development of Design Rules for Nozzles in Pressure Vessels for the ASME B&PV Code, Section VIII, Division 2 by : Z. Cao
Download or read book Development of Design Rules for Nozzles in Pressure Vessels for the ASME B&PV Code, Section VIII, Division 2 written by Z. Cao and published by . This book was released on 2010-01-01 with total page 145 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Welding Research Council Bulletin Series by : Welding Research Council (U.S.)
Download or read book Welding Research Council Bulletin Series written by Welding Research Council (U.S.) and published by . This book was released on 1970 with total page 872 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Summary of International Energy Research and Development Activities 1974-1976 by : Sam Stuart
Download or read book Summary of International Energy Research and Development Activities 1974-1976 written by Sam Stuart and published by Elsevier. This book was released on 2013-10-22 with total page 685 pages. Available in PDF, EPUB and Kindle. Book excerpt: Summary of International Energy Research and Development Activities 1974–1976 is a directory of energy research and development projects conducted in various countries such as Canada, Italy, Germany, France, Sweden, and the United Kingdom between 1974 and 1976. A limited number of projects sponsored by international organizations such as the International Atomic Energy Agency are also included. This directory consists of nine chapters and opens with a section on organic sources of energy such as coal, oil and gas, peat, hydrocarbons, and non-fossil organic sources. The next sections focus on thermonuclear energy and plasma physics; fission sources and energy production; geophysical energy sources; conversion technology; and environmental aspects of energy conversion and use. Energy transport, transmission, utilization, and conservation are also covered. The final chapter deals with energy systems and other energy-related research on subjects ranging from car sharing and urban passenger transport to nuclear power plants, energy supply and demand models, and high-power molecular lasers. This monograph will be a valuable resource of information for those involved in energy research and development.
Book Synopsis Processes and mechanisms of welding residual stress and distortion by : Zhili Feng
Download or read book Processes and mechanisms of welding residual stress and distortion written by Zhili Feng and published by CRC Press. This book was released on 2005-11-01 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt: As a fabrication technology, welding presents a number of technical challenges to the designer, manufacturer, and end-user of the welded structures. Both weld residual stress and distortion can significantly impair the performance and reliability of the welded structures. They must be properly dealt with during design, fabrication, and in-service use of the welded structures. There have been many significant and exciting developments on the subject in the past ten to fifteen years. Measurement techniques have been improved significantly. More importantly, the development of computational welding mechanics methods has been phenomenal. The progresses in the last decade or so have not only greatly expanded our fundamental understanding of the processes and mechanisms of residual stress and distortion during welding, but also have provided powerful tools to quantitatively determine the detailed residual stress and distortion information for a given welded structure. New techniques for effective residual stress and distortion mitigations and controls have also been applied in different industry sectors. Processes and Mechanisms of Welding Residual Stress and Distortion provides a comprehensive summary on the developments in the subject. It outlines theoretical treatments on heat transfer, solid mechanics and materials behavior that are essential for understanding and determining the welding residual stress and distortion. The approaches for computational methods and analysis methodology are described so that non specialists can follow them. There are chapters devoted to the discussion of various techniques for control and mitigation of residual stress and distortion, and residual stress and distortion results for various typical welded structures are provided. The second half of the book looks at case studies and practical solutions and provides insights into the techniques, challenges, limitations and future trends of each application. This book will not only be useful for advanced analysis of the subject, but also provide sufficient examples and practical solutions for welding engineers. With a panel of leading experts this authoritative book will be a valuable resource for welding engineers and designers as well as academics working in the fields of structural and mechanical engineering.
Book Synopsis Summary of International Energy Research and Development Activities, 1974-1976 by : Smithsonian Science Information Exchange
Download or read book Summary of International Energy Research and Development Activities, 1974-1976 written by Smithsonian Science Information Exchange and published by . This book was released on 1977 with total page 692 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents animal sounds in many different languages.
Book Synopsis WRC Bulletin by : Welding Research Council (U.S.)
Download or read book WRC Bulletin written by Welding Research Council (U.S.) and published by . This book was released on 1978 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book INIS Atomindex written by and published by . This book was released on 1988 with total page 988 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Reports of Progress by : Welding Research Council (U.S.)
Download or read book Reports of Progress written by Welding Research Council (U.S.) and published by . This book was released on 1970 with total page 650 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Bulletin by : Welding Research Council (U.S.)
Download or read book Bulletin written by Welding Research Council (U.S.) and published by . This book was released on 1961 with total page 560 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Metals Abstracts written by and published by . This book was released on 1988 with total page 1244 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Metals Abstracts Index written by and published by . This book was released on 1996 with total page 1622 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Pressure Vessel Design Manual by : Dennis R. Moss
Download or read book Pressure Vessel Design Manual written by Dennis R. Moss and published by Butterworth-Heinemann. This book was released on 2012-12-31 with total page 825 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pressure vessels are closed containers designed to hold gases or liquids at a pressure substantially different from the ambient pressure. They have a variety of applications in industry, including in oil refineries, nuclear reactors, vehicle airbrake reservoirs, and more. The pressure differential with such vessels is dangerous, and due to the risk of accident and fatality around their use, the design, manufacture, operation and inspection of pressure vessels is regulated by engineering authorities and guided by legal codes and standards. Pressure Vessel Design Manual is a solutions-focused guide to the many problems and technical challenges involved in the design of pressure vessels to match stringent standards and codes. It brings together otherwise scattered information and explanations into one easy-to-use resource to minimize research and take readers from problem to solution in the most direct manner possible. Covers almost all problems that a working pressure vessel designer can expect to face, with 50+ step-by-step design procedures including a wealth of equations, explanations and data Internationally recognized, widely referenced and trusted, with 20+ years of use in over 30 countries making it an accepted industry standard guide Now revised with up-to-date ASME, ASCE and API regulatory code information, and dual unit coverage for increased ease of international use
