The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform
Gholam Hossien Liaghat - One of the best experts on this subject based on the ideXlab platform.
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Explosive Welding of stainless steel–carbon steel coaxial pipes
Journal of Materials Science, 2012Co-Authors: Ehsan Zamani, Gholam Hossien LiaghatAbstract:Bi-metallic corrosion resistant steel pipes were produced through Explosive Welding process. The weldability window of the stainless steel pipe (inner pipe) and the carbon steel pipe (outer pipe) was determined by the use of available semi-empirical relations. The impact velocity of the pipes as the most important collision parameter was calculated by the finite element simulation. Direct effect of the Explosive mass reduction on the bonding interface of the pipes was studied. Optical microscopy study showed that a transition from a wavy interface to a smooth one occurs with decrease in Explosive load.
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Explosive Welding of stainless steel carbon steel coaxial pipes
Journal of Materials Science, 2012Co-Authors: Ehsan Zamani, Gholam Hossien LiaghatAbstract:Bi-metallic corrosion resistant steel pipes were produced through Explosive Welding process. The weldability window of the stainless steel pipe (inner pipe) and the carbon steel pipe (outer pipe) was determined by the use of available semi-empirical relations. The impact velocity of the pipes as the most important collision parameter was calculated by the finite element simulation. Direct effect of the Explosive mass reduction on the bonding interface of the pipes was studied. Optical microscopy study showed that a transition from a wavy interface to a smooth one occurs with decrease in Explosive load.
Ehsan Zamani - One of the best experts on this subject based on the ideXlab platform.
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Explosive Welding of stainless steel–carbon steel coaxial pipes
Journal of Materials Science, 2012Co-Authors: Ehsan Zamani, Gholam Hossien LiaghatAbstract:Bi-metallic corrosion resistant steel pipes were produced through Explosive Welding process. The weldability window of the stainless steel pipe (inner pipe) and the carbon steel pipe (outer pipe) was determined by the use of available semi-empirical relations. The impact velocity of the pipes as the most important collision parameter was calculated by the finite element simulation. Direct effect of the Explosive mass reduction on the bonding interface of the pipes was studied. Optical microscopy study showed that a transition from a wavy interface to a smooth one occurs with decrease in Explosive load.
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Explosive Welding of stainless steel carbon steel coaxial pipes
Journal of Materials Science, 2012Co-Authors: Ehsan Zamani, Gholam Hossien LiaghatAbstract:Bi-metallic corrosion resistant steel pipes were produced through Explosive Welding process. The weldability window of the stainless steel pipe (inner pipe) and the carbon steel pipe (outer pipe) was determined by the use of available semi-empirical relations. The impact velocity of the pipes as the most important collision parameter was calculated by the finite element simulation. Direct effect of the Explosive mass reduction on the bonding interface of the pipes was studied. Optical microscopy study showed that a transition from a wavy interface to a smooth one occurs with decrease in Explosive load.
Kazuyuki Hokamoto - One of the best experts on this subject based on the ideXlab platform.
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Numerical Simulation of Underwater Explosive Welding Process
Materials Science Forum, 2013Co-Authors: Wei Sun, Kazuyuki HokamotoAbstract:Recently, underwater Explosive Welding shows its advantage in some difficult-to-weld combinations such as material with thin thickness, high hardness, and fragile quality. The pattern of the typical wave morphology in the interface of the Welding specimen indicates the suitability of the selected experimental parameters and sound strength of the laminates. For the existence of the water, traditional Gurney formula and Aziz formula can not directly be used to evaluate the velocity and acceleration process of the flyer plate. Numerical simulation is necessary and irreplaceable for existing knowledge. Underwater Explosive Welding process was numerically simulated by ANSYS/LS-DYNA to explore the underwater shock wave and deformation process of the flyer plate. Velocity and pressure distribution of Welding plates were obtained. The velocity of the flyer plate could satisfy the minimum velocity in Explosive Welding. It was found that water prevented the gross distortion and ensured the integrity of the composite laminate. Welding rate was increased by expanding the size of the Explosive.
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Transition Joints of Aluminum and Magnesium Alloy Made by Underwater Explosive Welding Technique
Materials Science Forum, 2012Co-Authors: Palavesamuthu Manikandan, Akihisa Mori, Joo Noh Lee, Kotaro Mizumachi, Seyed Hadi Ghaderi, Kazuyuki HokamotoAbstract:In this study, aluminum alloy A5052 and magnesium alloy AZ31 were joined by conventional parallel setup of Explosive Welding and underwater Explosive Welding. Microstructural characterization of conventional welded joints revealed a characteristic wave formation with vortices and contact surface melting layer containing intermetallics. In order to reduce the vortices and melting layer, underwater Explosive Welding was used. The Welding parameters are regulated to reduce the kinetic energy loss during collision. The low kinetic energy loss in underwater Explosive Welding resulted in the formation of small waves with less vortices and no melting layer.
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Underwater Explosive Welding of Thin Magnesium Plate onto some Metal Plates
Materials Science Forum, 2007Co-Authors: Akihisa Mori, Kazuyuki Hokamoto, Masahiro FujitaAbstract:Explosive Welding of a thin magnesium plate onto some metal plates was performed by using underwater Explosive Welding technique developed by some of the authors. The experimental results show that the wavy interface which is typically found in the well-bonded clad was observed. The Welding condition is discussed using the Welding window based on the numerically simulated results using AUTODYN-2D code.
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Underwater Explosive Welding, Discussion Based on Weldable Window
AIP Conference Proceedings, 2006Co-Authors: Akihisa Mori, Kazuyuki Hokamoto, Keisuke Tamaru, Masahiro FujitaAbstract:A new method of underwater Explosive Welding is introduced and its possibilities are suggested. In the underwater Explosive Welding, a high Explosive with detonation velocity of 7km/s is placed at an initial inclined angle to decrease the horizontal collision point velocity, which is one of the important parameters to achieve Welding. This method is effective to accelerate a thin metal plate rapidly. However, this arrangement makes a difference in the Welding conditions with horizontal position when a constant thickness Explosive is used, as the propagation distance of the underwater shock wave increases at the ends. Hence, a method of linearly increasing the thickness of Explosive in proportion to the propagation distance is proposed. This investigation intends to clarify the Welding conditions in using a constant thickness Explosive and linearly increasing thickness Explosive based on numerical analysis. Further, a method of designing the assembly is confirmed through numerical analysis and its validity with the experimental results is demonstrated based on the Welding window.
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Explosive Welding of Thin Plates Using Underwater Shock Wave for Surface Modification
Materials Science Forum, 2004Co-Authors: Yasuhiro Ujimoto, Kazuyuki HokamotoAbstract:This paper presents a new method of Explosive Welding using underwater shock waves. The method renders the possibility of accelerating a thin metal plate uniformly at a velocity above a few hundreds m/s to satisfy the Explosive Welding requirements. The Welding of a thin titanium plate onto a stainless steel base and other Welding experiments were performed underwater. The bonding strength at the interface is observed to be high because the materials are welded based on the mechanism of Explosive Welding. The experimental results are discussed to characterize the state of bonding.
Malgorzata Lewandowska - One of the best experts on this subject based on the ideXlab platform.
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mechanical and microstructural characteristics of ti6al4v aa2519 and ti6al4v aa1050 aa2519 laminates manufactured by Explosive Welding
Materials & Design, 2016Co-Authors: Piotr Bazarnik, Boguslawa Adamczykcieślak, A Galka, B Plonka, L Sniezek, Marco Cantoni, Malgorzata LewandowskaAbstract:Abstract The aim of the work was to produce laminated structures consisting of Ti–6Al–4V alloy and AA2519 plates and to investigate their microstructure and mechanical properties with an emphasis on the role of an additional AA1050 interlayer. Explosive Welding was selected as a joining technology. The microstructure and chemical composition of the Explosively joined samples were investigated. Mechanical properties were evaluated in the tensile testing and by microhardness analysis. The results demonstrated that Explosive Welding is an effective way to produce Ti/Al laminates. Both Ti6Al4V/AA2519 and Ti6Al4V/AA1050/AA2519 laminated plates exhibit good quality of bonding without voids and major delamination. The Explosive Welding produced metallurgical bonding with a nanostructured zone consisting of Al 3 Ti and Al 2 Ti phases. This zone is thicker in the joint with additional AA1050 interlayer when compared to direct AA2519/Ti6Al4V bonding. In the latter, SEM and STEM analysis reviled the presence of net-like structure in the collision zone. Advanced EDX analysis shows the enrichment of grain boundaries in copper. The formation of this structure is widely discussed. In addition, the Explosive Welding introduces large plastic deformation which induces the process of grain refinement in aluminium plates. Tensile testing confirms that joining section is not the weakest element of the cladded plates.
Fehim Findik - One of the best experts on this subject based on the ideXlab platform.
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the effects of heat treatment on the microstructure and microhardness of Explosive Welding
Scientific Research and Essays, 2011Co-Authors: Fehim Findik, Ramazan Yilmaz, Tolga SomyurekAbstract:An AISI 304 type of austenitic stainless steel and low carbon steel were cladded by Explosive Welding in this study. Four Explosive loading rates were used with the range of 1 and 2.0. Stand-of distance (s=t) was also used as a Welding parameter. Cladded materials have been subjected to heat treatment at 250°C for times of ranging from 1 to 4 h. Effect of heat treatment on the microstructure and mechanical properties has been evaluated using optical and scanning electron microscopy, EDS analysis technique and hardness tests, respectively. The results indicate that straight and wavy structures of bonding at the interface were obtained according to the loading of Explosive rate. The grain size of the cladded materials near the interface were increased with the duration of heat treatment. Hardness values at the interface of the cladded materials were decreased with the increment of heat treatment period. Key word: Explosive Welding, hardness, microstructure, stainless steel, low carbon steel.
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recent developments in Explosive Welding
Materials & Design, 2011Co-Authors: Fehim FindikAbstract:Abstract Explosion Welding (EXW) is one of the joining methods consisting of a solid state Welding process in which controlled Explosive detonation on the surface of a metal. During the collision, a high velocity jet is produced to remove away the impurities on the metal surfaces. Flyer plate collides with base plate resulting in a bonding at the interface of metals. The metal plates are joined at an internal point under the influence of a very high pressure and causes considerable local plastic deformation at the interface in which metallurgical bonding occurs in nature and even stronger than the parent metals. Similar and dissimilar materials can be joined by Explosive Welding. In this paper, after detection the theories of Welding and wave formation, experimental research and numerical studies on Explosive Welding are reviewed for the last four decades. Also, future developments in Explosive Welding are predicted and criticized in an outlook.
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the influence of some factors on steel steel bonding quality on there characteristics of Explosive Welding joints
Journal of Materials Science, 2004Co-Authors: Mustafa Acarer, Behcet Gulenc, Fehim FindikAbstract:Explosive Welding is a solid state process in which controlled Explosive detonations force two or more metals together at high pressures. The resultant arrangement is joined with a high quality metallurgical bond. The aim of this study was to investigate of strength of Explosive Welding metals which had same chemical compositions. In this study, it was taken different Welding interfaces (straight, wavy and continuous solidified-melted) with changing Explosive Welding parameters (stand-off distance (s), Explosive loading (R) and anvils). Joined metals were investigated in heat treatment and non heat treatment conditions. Microstructures, microhardness, tensile shear strength and bending test results were reported. Effect of anvil on Explosive Welding process was evaluated in joining/no joining performance. It was shown that bonding interface changed from straight to wavy structure when Explosive loading and stand-off distance were increased. On wavy interface, when Explosive loading was increased wavy length and amplitude increased. Results of tensile shear and bending tests showed that heat treated specimens have more strength than which of unheat-treated ones. According to tensile shear test results, straight and wavy interfaces had similar strength. Also, bending zone has shown some cracks after the bending test of unheated specimens.
