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The combination of distinct materials is a key issue in modern industry, whereas the driving concept is to design parts with the right material in the right place. In this framework, a great deal of attention is directed towards dissimilar welding and joining technologies. In the automotive sector, for instance, the concept of “tailored blanks”, introduced in the last decade, has further highlighted the necessity to weld dissimilar materials. As far as the aeronautic field is concerned, most structures are built combining very different materials and alloys, in order to match lightweight and structural performance requirements. In this framework, the application of fusion welding techniques, namely, tungsten inert gas or laser welding, is quite challenging due to the difference in physical properties, in particular the melting point, between adjoining materials. On the other hand, solid-state welding methods, such as the friction stir welding as well as linear friction welding processes, have already proved to be capable of manufacturing sound Al-Cu, Al-Ti, Al-SS, and Al-Mg joints, to cite but a few. Recently, promising results have also been obtained using hybrid methods. Considering the novelty of the topic, many relevant issues are still open, and many research groups are continuously publishing valuable results. The aim of this book is to finalize the latest contributions on this topic.

n/a --- microstructure --- internal supports --- aging treatment --- Rare earth --- cloud of particles --- joining area --- Al/steel dissimilar materials --- welding-brazing --- dual-beam laser welding --- jet --- tensile --- aluminum-steel butt joint --- crack growth path --- spooling process tape --- lobe curve --- dissimilar metal welded joint --- electrical properties --- filler metals --- EBSD phase mapping --- dissimilar materials welding --- FSW --- mechanical properties --- dissimilar --- tubular joints --- optimal design --- hardness --- AISI 316L --- welding window --- fracture resistance --- tensile resistance --- dissimilar Ti6Al4V/AA6060 lap joint --- arc assisted laser method --- dissimilar metal welding --- dissimilar joints --- pulsed Nd:YAG laser --- solid state welding --- DP1000 steel --- cross-section adjustment --- fracture load --- pulsed Nd:YAG laser beam welding --- aluminum --- interface --- phase potential --- dissimilar weld --- failure mode --- Ag-Cu-Zn --- aluminum alloy --- copper --- intermetallic compounds --- electromagnetic pulse welding --- laser beam welding --- ageing --- dissimilar metals --- steel/aluminum joint --- side-by-side configuration --- friction stir spot welding --- interfacial crack initiation --- laser welding --- spatial beam oscillation --- magnetic pulse welding --- surface activation --- DeltaSpot welding --- tensile properties --- friction stir spot brazing --- friction stir welding --- steel/Al joint --- 1050 aluminum alloy --- local strength mismatch --- Inconel 625

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Laser welding is a high-energy process used in a wide range of advanced materials to obtain micro- to macro-sized joints in both similar and dissimilar combinations. Moreover, this technique is widely used in several industries, such as automotive, aerospace, and medical industries, as well as in electrical devices. Although laser welding has been used for several decades, significant and exciting innovations often arise from both the process and/or advanced materials side.

n/a --- tensile strength --- microstructure --- aided electric current --- stainless steel --- accuracy --- porosity control --- laser offset welding --- T-joint --- BTi-6431S --- dissimilar metal --- finite element method --- weld pool behavior --- dissimilar welding --- WPP --- laser welds --- HLAW --- fiber laser --- steel S700MC --- conduction regime --- liquid metal --- buy-to-fly --- EBSD phase mapping --- mass transfer --- mechanical properties --- hardness --- MAG --- phase transformation --- prediction --- LKW --- Ti-5Al-5V-5Mo-3Cr --- laser beam --- laser welding-brazing --- DP1000 steel --- Ti–6Al–4V --- titanium --- low alloyed steel --- H-shaped fusion zone --- pulsed Nd:YAG laser beam welding --- spatter --- high-speed imaging --- weld morphology --- high temperature titanium alloy --- Al/steel joints --- hybrid welding --- dissimilar material --- laser beam welding --- intermetallic layer --- WW --- L-joint --- penetration --- laser stake welding --- laser keyhole welding --- trip steel --- finite element analysis --- laser welding --- magnesium alloy thin sheet --- keyhole --- tensile properties --- dissimilar joining --- IMC layers --- SKM --- fiber laser welding --- aluminium --- dual phase steel --- aluminum alloy T-joint

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Welding is a technological field that has some of the greatest impact on many industries, such as automotive, aerospace, energy production, electronics, the health sector, etc. Welding technologies are currently used to connect the most diverse materials, from metallic alloys to polymers, composites, or even biological tissues. Despite the relevance and wide application of traditional welding technologies, these processes do not meet the demanding requirements of some industries. This has driven strong research efforts in the field of non-conventional welding processes. This Special Issue presents a sample of the most recent developments in the non-conventional welding of materials, which will drive the design of future industrial solutions with increased efficiency and sustainability.

Technology: general issues --- History of engineering & technology --- aluminium alloys --- friction stir welding --- strain rate --- traverse force --- steel --- weld --- high temperature --- creep --- fracture --- advanced methods --- AA6082-T6 --- bobbin friction stir welding --- microstructure --- optical microscopy --- EBSD --- dissimilar materials --- friction stir lap welding --- pin depth --- tilt angle --- tool rotational speed --- welding speed --- high entropy alloys --- welding techniques --- welding zone microstructure --- welding joint properties --- explosive welding --- light alloys --- hot rolling --- composite --- intermetallic --- FSW --- copper --- butt joint --- mechanical properties --- fatigue performance --- traverse and rotation speed --- three dissimilar aluminum alloys --- T-joints --- residual stress --- orbital hole-drilling strain-gauge method --- prediction of tensile yield force --- explosive cladding --- Zr 700 --- solid type welding --- weld strength --- laser beam welding --- sealed lap joints of dissimilar materials --- austenitic and ferritic-pearlitic steels --- numerical simulation --- microstructure analysis --- n/a

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Welding is a technological field that has some of the greatest impact on many industries, such as automotive, aerospace, energy production, electronics, the health sector, etc. Welding technologies are currently used to connect the most diverse materials, from metallic alloys to polymers, composites, or even biological tissues. Despite the relevance and wide application of traditional welding technologies, these processes do not meet the demanding requirements of some industries. This has driven strong research efforts in the field of non-conventional welding processes. This Special Issue presents a sample of the most recent developments in the non-conventional welding of materials, which will drive the design of future industrial solutions with increased efficiency and sustainability.

aluminium alloys --- friction stir welding --- strain rate --- traverse force --- steel --- weld --- high temperature --- creep --- fracture --- advanced methods --- AA6082-T6 --- bobbin friction stir welding --- microstructure --- optical microscopy --- EBSD --- dissimilar materials --- friction stir lap welding --- pin depth --- tilt angle --- tool rotational speed --- welding speed --- high entropy alloys --- welding techniques --- welding zone microstructure --- welding joint properties --- explosive welding --- light alloys --- hot rolling --- composite --- intermetallic --- FSW --- copper --- butt joint --- mechanical properties --- fatigue performance --- traverse and rotation speed --- three dissimilar aluminum alloys --- T-joints --- residual stress --- orbital hole-drilling strain-gauge method --- prediction of tensile yield force --- explosive cladding --- Zr 700 --- solid type welding --- weld strength --- laser beam welding --- sealed lap joints of dissimilar materials --- austenitic and ferritic-pearlitic steels --- numerical simulation --- microstructure analysis --- n/a

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Recent industrial criteria increasingly require the production of multi-material components. However, the manufacturing requirements of these components are not met by conventional welding techniques. Alternative solid-state technologies, such as impact-based processes, must be considered. The impact welding family is composed of several processes, such as explosion welding, magnetic pulse welding, vaporizing foil actuator welding, and laser impact welding. These processes present very different length scales, providing the impact welding family with a broad applicability range. A sample of the cutting-edge research that is being conducted on the multidisciplinary field of impact welding is presented in this book.

Technology: general issues --- dissimilar materials --- interlayer --- vaporizing foil actuators welding --- impact welding --- impact velocity --- impact angle --- welding interface --- flyer velocity --- energy efficiency --- peak velocity --- flyer rebound --- flyer size --- confinement layer --- explosive welding --- Ti6Al4V/Al-1060 --- microstructure --- mechanical properties --- smooth particle hydrodynamic (SPH) --- high-velocity impact welding --- smoothed particle hydrodynamics simulation --- welding window --- gelatin --- thin aluminum plate --- magnesium alloys --- LPSO phase --- cellular metal --- composite structure --- unidirectional cellular metal --- explosive compaction --- high-energy-rate forming --- tantalum/copper/stainless steel clads --- severe plastic deformation --- SEM/EBSD --- microhardness --- magnetic pulse welding --- dissimilar metals --- surface preparation --- interface --- aluminum --- carbon steel --- stainless steel --- collision welding --- pressure welding --- process glare --- jet --- cloud of particles --- shock compression --- surface roughness --- collision conditions --- model test rig --- welding mechanisms --- n/a