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Detection And Prevention Of Hot Cracks During Laser Welding Of Aluminium Alloys Using Advanced Simulation Methods
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Book Synopsis Detection and Prevention of Hot Cracks During Laser Welding of Aluminium Alloys Using Advanced Simulation Methods by : Attila Komlódi
Download or read book Detection and Prevention of Hot Cracks During Laser Welding of Aluminium Alloys Using Advanced Simulation Methods written by Attila Komlódi and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Hot Cracking Phenomena in Welds II by : Thomas Böllinghaus
Download or read book Hot Cracking Phenomena in Welds II written by Thomas Böllinghaus and published by Springer Science & Business Media. This book was released on 2008-08-07 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt: Failure of welded components can occur during service as well as during fabrication. Most common, analyses of the resistance of welded components against failure are targeted at crack avoidance. Such evaluations are increasingly carried out by modern weldability studies, i. e. considering interactions between the selected base and filler materials, structural design and welding process. Such weldability investigations are particularly targeted to prevent hot cracking, as one of the most common cracking phenomena occurring during weld fabrication. To provide an international information and discussion platform to combat hot cracking, an international workshop on Hot Cracking Phenomena in Welds has been created, based on an initiative of the Institute for Materials and Joining Technology at the Otto-von-Guericke University in Magdeburg and the Division V. 5 – Safety of Joined Components at the Federal Institute for Materials Research and Testing (BAM) in Berlin, Germany. The first workshop was organized in Berlin under the topics mechanisms and phenomena, metallurgy and materials, modelling and simulations as well as testing and standardization. It consisted of 20 individual contributions from eight countries, which were compiled in a book that found a very ready market, not only in the welding community. As a consequence of increasing interest, it has been decided to establish the Workshop on Hot Cracking Phenomena in Welds as a regular event every three years embedded in the International Institute of Welding (IIW). Attached to the IIW Commission IX and II Spring intermediate meetings, the second workshop was organized in March 2007.
Book Synopsis Simulation of the Structural Effects of Welded Frame Assemblies in Manufacturing Process Chains by : Loucas Papadakis
Download or read book Simulation of the Structural Effects of Welded Frame Assemblies in Manufacturing Process Chains written by Loucas Papadakis and published by Herbert Utz Verlag. This book was released on 2008 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Hot Cracking Phenomena in Welds III by : John Lippold
Download or read book Hot Cracking Phenomena in Welds III written by John Lippold and published by Springer. This book was released on 2011-05-13 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the third in a series of compendiums devoted to the subject of weld hot cracking. It contains 22 papers presented at the 3rd International Hot Cracking Workshop in Columbus, Ohio USA in March 2010. In the context of this workshop, the term “hot cracking” refers to elevated temperature cracking associated with either the weld metal or heat-affected zone. These hot cracking phenomena include weld solidification cracking, HAZ and weld metal liquation cracking, and ductility-dip cracking. The book is divided into three major sections based on material type; specifically aluminum alloys, steels, and nickel-base alloys. Each of these sections begins with a keynote paper from prominent researchers in the field: Dr. Sindo Kou from the University of Wisconsin, Dr. Thomas Böllinghaus from BAM and the University of Magdeburg, and Dr. John DuPont from Lehigh University. The papers contained within include the latest insight into the mechanisms associated with hot cracking in these materials and methods to prevent cracking through material selection, process modification, or other means. The three Hot Cracking Phenomena in Welds compendiums combined contain a total of 64 papers and represent the best collection of papers on the topic of hot cracking ever assembled.
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 456 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Book Synopsis Simulation and Optimization of Laser Welding on Aluminum Alloys by : Jonathan Montalvo-Urquizo
Download or read book Simulation and Optimization of Laser Welding on Aluminum Alloys written by Jonathan Montalvo-Urquizo and published by . This book was released on 2008 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Superalloys 2012 written by Eric S. Huron and published by John Wiley & Sons. This book was released on 2012-10-02 with total page 952 pages. Available in PDF, EPUB and Kindle. Book excerpt: A superalloy, or high-performance alloy, is an alloy that exhibits excellent mechanical strength at high temperatures. Superalloy development has been driven primarily by the aerospace and power industries. This compilation of papers from the Twelfth International Symposium on Superalloys, held from September 9-13, 2012, offers the most recent technical information on this class of materials.
Book Synopsis Hybrid Laser-Arc Welding by : F O Olsen
Download or read book Hybrid Laser-Arc Welding written by F O Olsen and published by Elsevier. This book was released on 2009-06-26 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hybrid laser-arc welding (HLAW) is a combination of laser welding with arc welding that overcomes many of the shortfalls of both processes. This important book gives a comprehensive account of hybrid laser-arc welding technology and applications.The first part of the book reviews the characteristics of the process, including the properties of joints produced by hybrid laser-arc welding and ways of assessing weld quality. Part two discusses applications of the process to such metals as magnesium alloys, aluminium and steel as well as the use of hybrid laser-arc welding in such sectors as ship building and the automotive industry.With its distinguished editor and international team of contributors, Hybrid laser-arc welding is a valuable source of reference for all those using this important welding technology. - Reviews arc and laser welding including both advantages and disadvantages of the hybrid laser-arc approach - Explores the characteristics of the process including the properties of joints produced by hybrid laser-arc welding and ways of assessing weld quality - Examines applications of the process including magnesium alloys, aluminium and steel with specific focus on applications in the shipbuilding and automotive industries
Download or read book Metals Abstracts written by and published by . This book was released on 1998 with total page 1076 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Inhibition of Cracking in Pulsed Laser Welding of Aluminium Alloys by : Seog-Yoon Jeong
Download or read book Inhibition of Cracking in Pulsed Laser Welding of Aluminium Alloys written by Seog-Yoon Jeong and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Investigation of Laser Shock Processing by : S. C. Ford
Download or read book Investigation of Laser Shock Processing written by S. C. Ford and published by . This book was released on 1980 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of the program was to demonstrate that laser shock processing is a viable method of improving the fatigue and crack growth performance of mechanically fastened joints. It was shown that a decrease in crack growth rate can be achieved under specified conditions. These conditions involve compressive residual stress (induced by the process) which modify the crack shape and reduce the stress intensity factor. 2024-T3 aluminum alloy reacted better to the process than 7075-T6 aluminum. Results were better in thin (.125 inch) than thick (.250 inch) material. Initial design environmental and cost studies indicate that a laser shock processing system for use on a production line is feasible.
Book Synopsis Investigation of the Metallurgical and Thermo-Mechanical Factors Influencing Centreline Solidification Cracking by Laser Beam and Hybrid Welding by : Vanessa Quiroz Penaranda
Download or read book Investigation of the Metallurgical and Thermo-Mechanical Factors Influencing Centreline Solidification Cracking by Laser Beam and Hybrid Welding written by Vanessa Quiroz Penaranda and published by . This book was released on 2020-07-09 with total page 211 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of the present thesis is to make advancements in understanding solidification crack formation in laser beam and laser-hybrid welding. Focus was laid on the investigation of the metallurgical and thermo-mechanical influencing factors. The factors affecting centreline crack formation are investigated with the aim of finding conditions for hot crack resistant welds. The main emphasis is placed on the impact of structural design and the associated stiffness conditions of the structure to be welded on the hot cracking resistance of various materials such as pipeline steels and a variety of stainless steels. This thesis provides a critical assessment of the current hot cracking tests for the evaluation of centerline solidification cracking during laser beam and laser hybrid welding. The self-restraint and externally-loaded hot cracking tests, IRC- and CTW-test respectively, were successfully applied in conjunction with laser beam welding. Both tests enabled the assessment of centreline solidification cracks based on measurable critical parameters.
Book Synopsis DETERMINATION OF WELDING PARAMETER DEPENDENT HOT CRACKING SUSCEPTIBILITY OF 5086-H32 ALUMINIUM ALLOY WITH THE USE OF MVT METHOD. by :
Download or read book DETERMINATION OF WELDING PARAMETER DEPENDENT HOT CRACKING SUSCEPTIBILITY OF 5086-H32 ALUMINIUM ALLOY WITH THE USE OF MVT METHOD. written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Hot cracking is a serious problem that encounters during welding of aluminium-magnesium alloys. In the present study, solidification and liquation type of hot cracks in weld metal and the heat-affected zones of 5086-H32 aluminium alloy were investigated by using Modified Varestraint Test (MVT) with TIG-AC and TIG-DC welding. With determining the size, type and number of cracks, a relation was established between welding line energy and strain on the hot crack formation. This information was used to determine the hot crack safe parameter ranges. The hot cracking tendency as a function of applied parameters were discussed in the frame of temperature fields around the moving heat source. Moreover, the characteristic hot crack locations on the 5086-H32 MVT specimens were generalized. The results of the study indicated that the increase in line energy and strain increased the hot cracking tendency of the specified aluminium alloy. In the low line energy range, the main hot cracking mechanism is the solidification cracking which could be overcome by the use of a suitable filler material. At high line energy range, due to the increased amount of interdendritic liquid, the amount of solidification cracking decreases by healing mechanism. However, because of the enlarged-temperature-field around the weld zone, fraction of HAZ cracking increases. The comparison between the hot cracking tendencies in low and high line energies indicates that the low line energy ranges with low augmented strains resulted in hot crack safer parameters.
Book Synopsis Susceptibility of Aluminium Alloys to Solidification Cracking by : Tayfun Soysal
Download or read book Susceptibility of Aluminium Alloys to Solidification Cracking written by Tayfun Soysal and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Solidification cracking is a serious weld defect in welding aluminum (Al) alloys. It occurs in the mushy zone (a small weak semisolid immediately behind the weld pool) when the critical strain rate of the mushy zone is exceeded. Most tests for evaluating the solidification cracking susceptibility cannot determine the critical strain rate of the mushy zone. In the present thesis, welding of Al alloys was studied using a new test for evaluating the crack susceptibility and a new index for predicting the crack susceptibility. The test, called the transverse motion weldability (TMW) test, was developed. This test is unique in that a stationary upper sheet is lap-welded to a lower sheet moving slowly at the speed V in the transverse direction of welding to induce transverse tensile strain and hence cracking in the mushy zone. Cracking occurs when a critical V, i.e., V[c], is exceeded. The TMW test showed that the susceptibility to solidification cracking increased in the order of 2219 Al, 2014 Al, 2024 Al, 7075 Al and 6061 Al. This ranking is consistent with that based on other tests. It is also consistent with that predicted based on the crack susceptibility index, which is the maximum -dT/d(f[S])[1/2]- (where T is temperature and f[S] fraction of solid). The test was also used to see how effective Al filler metals reduce the crack susceptibility of Al alloys. The effectives observed agreed with that reported previously, shown in filler-metal guides, and predicted based on the index. To determine the local strain rate in the mushy zone near the crack, a new approach based on the TMW test and the weld microstructure was developed. Crack susceptibility of commercial wrought aluminum alloys were explained to provide a better understanding for solidification cracking.
Book Synopsis Defect Formation During High Power Laser Welding of A Creep Resistant Nickel Alloy by : Mingze Gao
Download or read book Defect Formation During High Power Laser Welding of A Creep Resistant Nickel Alloy written by Mingze Gao and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: High power laser welding, with powers on the order of 10 kW, represents an attractive pathway for improving productivity in the single pass joining of thick section structures. During high power laser welding of Inconel 740H, a candidate material for the steam pipes in advanced ultra supercritical power plants, defects were observed, including keyhole collapse porosity, liquation cracking in the heat affected zone, and solidification cracking in the fusion zone, which displayed variations with processing conditions. Although liquation cracks and keyhole porosity were observed for all these high power laser welding conditions due to the high heat input and keyhole instability, horizontal solidification cracks across the fusion zones were observed at depths of around 70% to 80% of the weld depths, while the same material does not display similar solidification cracking during arc welding and low power laser welding conditions. A similar crack was not observed in another nickel alloy, Inconel 690, under the same welding conditions. To capture the complex interactions between alloy composition and processing conditions leading to the appearance of these cracks, well-tested heat transfer and fluid flow and thermo-mechanical models were integrated to calculate temperature histories, solidification conditions, and the resulting stresses and strain rates across the solidifying mushy zone. The coupling of these powerful models provided a means for evaluating horizontal solidification cracking susceptibility and predicting crack locations by identifying the simultaneous appearance of critical strain rate and tensile stress levels across different processing conditions and alloys. Since alloy composition is usually fixed within a specified range, the prevention of these defects requires tight control of the processing conditions. Wobble head laser welding, as an emerging tool in high power laser welding, was employed, which provides new opportunities to alter process conditions and produce defect free welds. Due to the additional transverse and backward motions with the laser beam oscillation, the laser energy density distribution across the weldment was altered, leading to variations in weld pool dimensions, solidification conditions, and stress state across the welds. The application of beam oscillation led to shorter, wider, and shallower weld pools. Due to these changes in weld profiles, the solidification rate was reduced while the temperature gradient was increased compared with the linear welds. These changes in the process conditions also impacted the stress state, which provide opportunities to prevent solidification cracking during high power laser welding process.
Download or read book Metals Abstracts Index written by and published by . This book was released on 1995 with total page 1390 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Methods of Determining the Hot Cracking Resistance of Aluminium Alloys by : S Gavrilin
Download or read book Methods of Determining the Hot Cracking Resistance of Aluminium Alloys written by S Gavrilin and published by . This book was released on 1998 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
