Investigation Of The Metallurgical And Thermo Mechanical Factors Influencing Centreline Solidification Cracking By Laser Beam And Hybrid Welding

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Investigation of the Metallurgical and Thermo-Mechanical Factors Influencing Centreline Solidification Cracking by Laser Beam and Hybrid Welding

Author : Vanessa Quiroz Penaranda
Publisher :
ISBN 13 : 9783839616017
Total Pages : 211 pages
Book Rating : 4.6/5 (16 download)

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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.

Hot Cracking Phenomena in Welds II

Author : Thomas Böllinghaus
Publisher : Springer Science & Business Media
ISBN 13 : 3540786287
Total Pages : 458 pages
Book Rating : 4.5/5 (47 download)

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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.

Hot Cracking Phenomena in Welds

Author : Thomas Böllinghaus
Publisher : Springer Science & Business Media
ISBN 13 : 354027460X
Total Pages : 398 pages
Book Rating : 4.5/5 (42 download)

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Book Synopsis Hot Cracking Phenomena in Welds by : Thomas Böllinghaus

Download or read book Hot Cracking Phenomena in Welds written by Thomas Böllinghaus and published by Springer Science & Business Media. This book was released on 2005-10-20 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although the avoidance of hot cracking still represents a major topic in modern fabrication welding components, the phenomena have not yet been fully understood. Through the 20 individual contributions from experts all over the world the present state of knowledge about hot cracking during welding is defined, and the subject is approached from four different viewpoints. The first chapter provides an overview of the various hot cracking phenomena. Different mechanisms of solidification cracking proposed in the past decades are summarized and new insight is particularly given into the mechanism of ductility dip cracking. The effects of different alloying elements on the hot cracking resistance of various materials are shown in the second chapter and, as a special metallurgical effect, the initiation of stress corrosion cracking at hot cracks has been highlighted. The third chapter outlines how numerical analyses and other modelling techniques can be utilized to describe hot cracking phenomena and how such results might contribute to the explanation of the mechanisms. Various hot cracking test procedures are presented in the final chapter with a special emphasis on standardization. For the engineering and natural scientists in research and development the book provides both, new insight and a comprehensive overview of hot cracking phenomena in welds. The contributions additionally give numerous individual solutions and helpful advice for international welding engineers to avoid hot cracking in practice. Furthermore, it represents a very helpful tool for upper level metallurgical and mechanical engineering students.

Thermo-mechanical Modeling of Laser-MAG Hybrid Welding and Consequences on Large Structure

Author : Ludovic Koundé
Publisher :
ISBN 13 :
Total Pages : 17 pages
Book Rating : 4.:/5 (125 download)

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Book Synopsis Thermo-mechanical Modeling of Laser-MAG Hybrid Welding and Consequences on Large Structure by : Ludovic Koundé

Download or read book Thermo-mechanical Modeling of Laser-MAG Hybrid Welding and Consequences on Large Structure written by Ludovic Koundé and published by . This book was released on 2012 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: Welding induces local residual stress and strain in workpiece joining. These local phenomena lead to distortions in the workpieces and aspect defaults. The consequence is aspect defaults (distortions), which can be corrected by heating and hammering. When the assembled elements have large dimensions and need many joints executed by welding sequences, the aspect defaults can be created by non-optimized sequences. The focus of this study is the optimization of joint sequences (through the numerical simulation of sequences) to minimize distortions induced in wall train shell car manufacturing. The parts are assembled with hybrid laser-MAG welding technology. The metallurgical transformations of the material microstructure are taken into account. A new analytical function called "diaboloïd" has been developed to reproduce the morphology of the molten zone and the heat affected zone created by the laser welding. This analytical function is associated with the double ellipsoid analytical function in order to model the laser-arc hybrid welding process. The material thermo-physical properties according to temperature and phase transformation are taken into account in the numerical model. Experimental measurements (cooling rate, residual stresses) have been done in order to correlate numerical and experimental results. The effects of clamping conditions and tack welds are also considered in the numerical model. All these developments made it possible to reduce the displacement of large structures by a factor of 5.

Defect Formation During High Power Laser Welding of A Creep Resistant Nickel Alloy

Author : Mingze Gao
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (14 download)

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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.

Hot Cracking Phenomena in Welds III

Author : John Lippold
Publisher : Springer
ISBN 13 : 9783642168659
Total Pages : 440 pages
Book Rating : 4.1/5 (686 download)

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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.

Hybrid Laser-Arc Welding

Author : F O Olsen
Publisher : Elsevier
ISBN 13 : 1845696522
Total Pages : 336 pages
Book Rating : 4.8/5 (456 download)

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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

Thermal-mechanical Modeling and Experimental Validation of Weld Solidification Cracking in 6061-T6 Aluminum

Author :
Publisher :
ISBN 13 :
Total Pages : 9 pages
Book Rating : 4.:/5 (683 download)

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Book Synopsis Thermal-mechanical Modeling and Experimental Validation of Weld Solidification Cracking in 6061-T6 Aluminum by :

Download or read book Thermal-mechanical Modeling and Experimental Validation of Weld Solidification Cracking in 6061-T6 Aluminum written by and published by . This book was released on 1997 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Finite element simulation using an internal state variable constitutive model coupled with a void growth and damage model are used to study weld solidification cracking of 6061-T6 aluminum. Calculated results are compared with data from an experimental program determining the locations of failure as a function of weld process parameters and specimen geometry. Two types of weld solidification cracking specimen were studied. One specimen, in which cracking did not occur, was used to evaluate finite element simulations of the thermal response and calculations of average strain across the weld. The other specimen type was used to determine the location of crack initiation as a function of weld process parameters. This information was used to evaluate the finite element simulations of weld solidification cracking. A solidification model which includes dendrite tip and eutectic undercooling was used in both thermal and mechanical finite element analyses. A strain rate and temperature history dependent constitutive model is coupled with a ductile void growth damage model in the mechanical analyses. Stresses near the weld pool are examined to explain results obtained in the finite element analyses and correlated with experimental observations. Good agreement is obtained between simulation and experiment for locations of crack initiation and extent of cracking. Some effects of uncertainties in material parameters are discussed.

Hot Cracking Phenomena in Welds III

Author : John Lippold
Publisher : Springer Science & Business Media
ISBN 13 : 3642168647
Total Pages : 439 pages
Book Rating : 4.6/5 (421 download)

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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 Science & Business Media. This book was released on 2011-05-03 with total page 439 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.

Weld Cracking in Ferrous Alloys

Author : R Singh
Publisher : Woodhead Publishing
ISBN 13 : 9781845693008
Total Pages : 0 pages
Book Rating : 4.6/5 (93 download)

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Book Synopsis Weld Cracking in Ferrous Alloys by : R Singh

Download or read book Weld Cracking in Ferrous Alloys written by R Singh and published by Woodhead Publishing. This book was released on 2008-12-12 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Weld cracks are unacceptable defects that can compromise the integrity of welded structures. Weld cracking can lead to structural failures which at best will require remedial action and at worst can lead to loss of life. Weld cracking in ferrous alloys reviews the latest developments in the design, evaluation, prevention and repair of weld cracks. Part one reviews the fundamentals as well as recent advances in the areas of welding technology, design and material selection for preventing weld cracking. Part two analyses weld crack behaviour, evaluation and repair of cracking/cracked welds. The book benefits from an extensive and robust chapter on the topic of NDE and quality control that was contributed by one of the most respected non-destructive evaluation and development groups in the world. Part three covers environment assisted weld cracking. With its distinguished editor and international team of contributors, Weld cracking in ferrous alloys is a valuable source of reference for all those concerned with improving the quality of welding and welded components. In the planning and development of this book, particular care has been taken to make the chapters suitable for people from other disciplines who need to understand weld cracking and failure.

Thermo-mechanical Fatigue of Polycrystalline, Directionally Solidified and Single Crystal Nickel Base Superalloys Repaired by Laser Beam Welding

Download Thermo-mechanical Fatigue of Polycrystalline, Directionally Solidified and Single Crystal Nickel Base Superalloys Repaired by Laser Beam Welding PDF Online Free

Author : Jonathan Durocher
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (858 download)

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Book Synopsis Thermo-mechanical Fatigue of Polycrystalline, Directionally Solidified and Single Crystal Nickel Base Superalloys Repaired by Laser Beam Welding by : Jonathan Durocher

Download or read book Thermo-mechanical Fatigue of Polycrystalline, Directionally Solidified and Single Crystal Nickel Base Superalloys Repaired by Laser Beam Welding written by Jonathan Durocher and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Conference Papers Index

Author :
Publisher :
ISBN 13 :
Total Pages : 950 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Conference Papers Index by :

Download or read book Conference Papers Index written by and published by . This book was released on 1987 with total page 950 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Prevention of Solidification Cracking During Pulsed Laser Beam Welding

Author : Jean Pierre Bergmann
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (1 download)

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Book Synopsis Prevention of Solidification Cracking During Pulsed Laser Beam Welding by : Jean Pierre Bergmann

Download or read book Prevention of Solidification Cracking During Pulsed Laser Beam Welding written by Jean Pierre Bergmann and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Simulation of Solidification Cracking of Structural Steels During Laser Beam Welding

Author : E. Schubert
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (247 download)

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Book Synopsis Simulation of Solidification Cracking of Structural Steels During Laser Beam Welding by : E. Schubert

Download or read book Simulation of Solidification Cracking of Structural Steels During Laser Beam Welding written by E. Schubert and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Welding Metallurgy and Weldability

Author : John C. Lippold
Publisher : John Wiley & Sons
ISBN 13 : 1118230701
Total Pages : 418 pages
Book Rating : 4.1/5 (182 download)

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Book Synopsis Welding Metallurgy and Weldability by : John C. Lippold

Download or read book Welding Metallurgy and Weldability written by John C. Lippold and published by John Wiley & Sons. This book was released on 2014-11-24 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt: Describes the weldability aspects of structural materials used in a wide variety of engineering structures, including steels, stainless steels, Ni-base alloys, and Al-base alloys Welding Metallurgy and Weldability describes weld failure mechanisms associated with either fabrication or service, and failure mechanisms related to microstructure of the weldment. Weldability issues are divided into fabrication and service related failures; early chapters address hot cracking, warm (solid-state) cracking, and cold cracking that occur during initial fabrication, or repair. Guidance on failure analysis is also provided, along with examples of SEM fractography that will aid in determining failure mechanisms. Welding Metallurgy and Weldability examines a number of weldability testing techniques that can be used to quantify susceptibility to various forms of weld cracking. Describes the mechanisms of weldability along with methods to improve weldability Includes an introduction to weldability testing and techniques, including strain-to-fracture and Varestraint tests Chapters are illustrated with practical examples based on 30 plus years of experience in the field Illustrating the weldability aspects of structural materials used in a wide variety of engineering structures, Welding Metallurgy and Weldability provides engineers and students with the information needed to understand the basic concepts of welding metallurgy and to interpret the failures in welded components.

Handbook of Laser Welding Technologies

Author : S Katayama
Publisher : Elsevier
ISBN 13 : 0857098772
Total Pages : 685 pages
Book Rating : 4.8/5 (57 download)

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Book Synopsis Handbook of Laser Welding Technologies by : S Katayama

Download or read book Handbook of Laser Welding Technologies written by S Katayama and published by Elsevier. This book was released on 2013-06-30 with total page 685 pages. Available in PDF, EPUB and Kindle. Book excerpt: Laser welding is a rapidly developing and versatile technology which has found increasing applications in industry and manufacturing. It allows the precision welding of small and hard-to-reach areas, and is particularly suitable for operation under computer or robotic control. The Handbook of laser welding technologies reviews the latest developments in the field and how they can be used across a variety of applications.Part one provides an introduction to the fundamentals of laser welding before moving on to explore developments in established technologies including CO2 laser welding, disk laser welding and laser micro welding technology. Part two highlights laser welding technologies for various materials including aluminium and titanium alloys, plastics and glass. Part three focuses on developments in emerging laser welding technologies with chapters on the applications of robotics in laser welding and developments in the modelling and simulation of laser and hybrid laser welding. Finally, part four explores the applications of laser welding in the automotive, railway and shipbuilding industries.The Handbook of laser welding technologies is a technical resource for researchers and engineers using laser welding technologies, professionals requiring an understanding of laser welding techniques and academics interested in the field. - Provides an introduction to the fundamentals of laser welding including characteristics, welding defects and evolution of laser welding - Discusses developments in a number of techniques including disk, conduction and laser micro welding - Focusses on technologies for particular materials such as light metal alloys, plastics and glass

Manufacturing and Application of Stainless Steels

Author : Andrea Di Schino
Publisher : MDPI
ISBN 13 : 3039286501
Total Pages : 260 pages
Book Rating : 4.0/5 (392 download)

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Book Synopsis Manufacturing and Application of Stainless Steels by : Andrea Di Schino

Download or read book Manufacturing and Application of Stainless Steels written by Andrea Di Schino and published by MDPI. This book was released on 2020-04-15 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stainless steels represent a quite interesting material family, both from a scientific and commercial point of view, following to their excellent combination in terms of strength and ductility together with corrosion resistance. Thanks to such properties, stainless steels have been indispensable for the technological progress during the last century and their annual consumption increased faster than other materials. They find application in all these fields requiring good corrosion resistance together with ability to be worked into complex geometries. Despite to their diffusion as a consolidated materials, many research fields are active regarding the possibility to increase stainless steels mechanical properties and corrosion resistance by grain refinement or by alloying by interstitial elements. At the same time innovations are coming from the manufacturing process of such a family of materials, also including the possibility to manufacture them starting from metals powder for 3D printing. The Special Issue scope embraces interdisciplinary work covering physical metallurgy and processes, reporting about experimental and theoretical progress concerning microstructural evolution during processing, microstructure-properties relations, applications including automotive, energy and structural.