The interfacial zone at the welded interface is composed of a fine eutectic structure of aluminum and fe 4 al, and the explosive welding process of this metal combination proceeds mainly by intensive deformation of the aluminum alloy. Explosive welding is a solid state impact welding process that employs large quantities usually a few centimeters thick of high explosive to accelerate a flyer plate against a target plate. Explosive welding, johnsoncook equation, finite element, jwl equation 1 introduction explosive welding is an area of study that represents a truly multidisciplinary research as it deals with the dynamics of collision at high velocities and pressures, the transient fluid like behaviour of metals at extremely high strain rates. Lead arc welding of a forged steel cupandcross tiedown assembly into an aluminum aircraft carrier deck plate. It is conceivable that explosive welds first appeared sometime after the 1880s when high velocity gunnery was introduced and projectiles impinged on metal targets.
Basic characteristics of the explosive welding technique using. This ensures a leak proof method of jointing which is able to withstand the higher temperatures. Keith escoe, in pressure vessel and stacks field repair manual, 2008. In 70s, the explosive welding was intensively used in attempts to develop an economically effective fabrication route for metal matrix. The phenomenon, discovered by lavrentiev at the end of the ww ii 122, is an efficient way to bond together two similar or dissimilar materials. What is explosive welding and in what applications is it. Explosion welding is a solidstate process that produces a high velocity interaction of dissimilar metals by a controlled detonation. Us3024526a us56084a us5608460a us3024526a us 3024526 a us3024526 a us 3024526a us 56084 a us56084 a us 56084a us 5608460 a us5608460 a us 5608460a us 3024526 a us3024526 a us 3024526a authority us united states prior art keywords metal explosive surfaces welded gas prior art date 19600831 legal status the legal status is an assumption and is not a legal conclusion.
Lower and upper explosive limits for flammable gases and vapors. Explosive welding of metals in a vacuum environment smt holland. During the explosive welding process, a powerful shock drives the metal atoms into each others sphere of influence, forcing the valence electrons into. Introduction as a technological process, the explosive welding. Hemi utilizes explosive bonding to create the highest quality bimetallic products for a wide variety of applications. Explosive welding process, joining of dissimilar materials. The flyer plate hits the base plate immediately determined by the effect power, and the fast. Explosion welding can be used to join a wide variety of dissimilar or similar metals. The upper plate is placed carefully at an angle of approximately. Welding can be defined as the process of joining two or more materials, often. Explosive welding article about explosive welding by the. Subsonic shock waves are created by low explosives through the slower burning process known as deflagration.
The method is well established for wide variety of materials with flat and large surface area. A solidstate welding process that produces coalescence by high velocity interaction of the work pieces produced by a controlled detonation. During this procedure, it is required to provide reliable resistance against radial convergent strains. During the collision, a high velocity jet is produced to remove away the impurities on the metal surfaces. Aluminium and copper can be welded to stainless steel, aluminium to nickel alloys, and stainless steel to nickel. This method can clad a wide range of metals to almost any base material. A completely new method of welding which employs high explosives is briefly. High energy metals explosion bonding the explosion bonding process explosion welding, or bonding, is a solid state welding process that is used for the metallurgical joining of metals. The bond is formed due to the high velocity oblique impact. For free running explosives, the density is often specified as the pounds of explosives per foot of charge length in a given size borehole. The flyer top plate is covered by an explosive layer. Density is an important consideration when choosing an explosive.
Explosion welding develops an extremely high pressure for a short time. In the process of explosive welding, the impact of two plates is accompanied, as a rule. The main applications are in flat plate cladding or cladding of cylindrical geometries. Touchy welding, additionally called hazardous cladding, is a high vitality process, in which strong surfaces of two metal segments of disparate or comparable materials are cladded by explosion vitality from angled high speed sway. This metalworking technique uses controlled detonations to force dissimilar metals into a high quality, metallurgically bonded joint.
Explosion welding exw is a solid state solidphase process where welding is accomplished by accelerating one of the components at extremely high velocity. 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. Pdf study of the explosive welding process and applications. Gas oxyfuelcutting gas welding combustion and explosion explosion movie.
A high welding explosive mass in placed circumferentially on a metal sleeve having a substantially cylindrical outer surface and is formed of a circumferential body having a greater thickness at the center of the mass than at its ends such that on initiation maximum explosive impact is exerted inwardly toward said sleeve to weld it to the abutting ends of two encircled pipes, the welding. Explosive welding an overview sciencedirect topics. This is a process in which the controlled energy of a detonating explosive is used to create a metallic bond between two similar or dissimilar materials. Fusion welding determines the materials that can be used, materials which are often not the most suitable for the operating conditions. With few exceptions, denser explosives give higher detonation velocities and pressures. Recent developments in explosive welding request pdf. Explosive welding is a solid state metal joining process used to create a metallurgical bond between two similar or dissimilar metals 1. Mechanical, civil, chemical, and other engineers present 50 papers on such topics as welding a supersonic solidstate detonation in an overdriven porous mixture of aluminum and teflon, high temperature elastic properties of refractory materials, energy dissipation in the explosive welding of dissimilar metals, a newly developed unsteady wave. Explosive welding is a specialised process used for lap joints in difficult to weld metals and their combinations. Before a fire or explosion can occur, three conditions must be met simultaneously. New explosive welding technique to weld springerlink. The weldable region for various aluminum alloys is decided by the change in collision velocity and kinetic. Explosive welding 2008 henry tan 2 3 explosive welding setup two plates are separated by a standoff gap.
The most common application of this technique is to directly weld high strength, stainless steel action parts onto aluminum structures. We pride ourselves on solving demanding material design and processing challenges by joining dissimilar metals using explosion welding, roll bond and weld overlay for the worlds industrial infrastructure. Cladding metal or cladder is the thinner plate that is either in direct contact with the explosive, or is shielded by a flyer plate from the explosive. The welding master pdf structural and mechanical properties of metallic.
Aluminium can be welded to copper and stainless steel to brass. Upon detonation the explosive accelerates the top plate against the parent bottom plate. This process is most commonly utilized to clad carbon steel plate with a thin layer of corrosion resistant material e. Energetics and detonics department of mechanical engineering, university of coimbra, rua luis reis santos, polo ii, 3030. Osha requires employers to provide workplaces that are free of recognized hazards. In simple terms an explosive weld is achieved by impelling the cladding plate against the substrate plate material using. Third, the explosive is detonated, driving the plates together.
Recent developments in explosive welding sciencedirect. The largest commercial application of explosives is mining. High velocity ms impact on composite liner and steel target duration. Explosion welding is a solidstate process that produces a high velocity interaction of dissimilar metals by a controlled detonation slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Pdf in this work, t2 red copper and high nitrogen austenitic stainless steel hnass were explosively welded for the first time. Explosive welding differs from other traditional joining processes as it does not depend on melting of two metals to be joined, or on plastic deformation of the surfaces in contact as occurs with cold or hot pressure welding.
Flyer plate is a sacrificial plate placed between the cladder and the explosive to protect the cladder metal. Safely performing hot work on hollow or enclosed structures. This animation of an explosive weld was created for historys modern marvels actuality productions by flyingblue studio. Explosive welding takes place when two plates are impacted together under an explosive force at high velocity. Explosive any chemical compound, mixture, or device, the primary or common purpose of which is to function by explosion, i. Explosion welding exw is a solid state solidphase process where welding is accomplished by accelerating one of the components at extremely high velocity through the use of chemical explosives. The lower plate is laid on a firm surface, such as a heavier steel plate. Faes2 1 ghent university, laboratory soete, belgium 2 abstract almost 50 years after magnetic pulse welding was invented, it is finally finding its way to the private sector, in particular the transportation and refrigeration industries. Whether the mine is on the surface or is buried underground, the detonation or deflagration of either a high or low explosive in a confined space can be used to liberate a fairly specific subvolume of a brittle material in a much larger volume of the same or similar material. At tnopml several of the explosive welding configurations that were. Explosive welding of cylindrical surfaces is performed by launching of welded layer along longitudinal axis of construction. Explosive welding can be considered as a kind of hotpressing. Lower and upper explosive limits for flammable gases and.
Explosive hydroforming explosive hydroforming is a metal forming technique that uses the energy generated by an explosive detonation to form the metal work piece. Blending our technical expertise and welding technologies, we offer the widest collection of clad metal products anywhere in the world. A weld joint is produced by means of a high velocity impact of one metallic mass onto another, aided by a controlled detonation with an explosive charge. Explosive welding or cladding is usually performed on relative thick plates by means of a large scale parallel plate setup. The solution yimpact explosive welding produces a high velocity movement from a controlled axial detonation. Explosive welding is an effective method of joining of various metals and alloys. These are gas gun welding ggw, explosive welding exw, magnetic pulse welding mpw. If the shock wave is a supersonic detonation, then the source of the blast is called a high explosive. Explosive welding of tin ppt video online download. In this process, the energy released during detonation of the high explosive is used to accelerate one metal plate into another, and as a result, the highvelocity. Definition of explosion welding detonator explosive. Component arrangement for explosion welding principles of explosion welding. Effect of explosive characteristics on the explosive.
132 766 840 816 330 1358 158 1434 873 1230 694 215 1208 1157 1182 585 1039 1340 861 629 1044 721 480 544 1077 642 1198 12 1002 1304 1155 922 957 1446 139 1356 42 360 1286 858 831