The purpose of explosive welding. In practice, regular use is made of aggressive reagents, to which normal steel qualities offer insufficient resistance. The structure near the interface of bimetallic strips strongly influences their properties. In this work, the interfacial layers of explosively welded aluminium and. It is well known that the explosive welding is a highly intense and rapid action on the It distinguishes the explosive welding process from the other ways of.

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Explosive Welding Pdf

A novel explosive welding technique which uses underwater shock waves to weld Keywords: explosive welding, underwater shock wave, thin plate welding, . PDF | Explosive welding or cladding is usually performed on relative thick plates by means of a large scale parallel plate set-up. At TNO-PML several of the. interface of explosive-welded and multi-pass hot-rolled bimetallic plate During the explosive welding process, the flyer plate impacts the base.

Reddit Abstract In order to improve the energy utilization ratio of explosives and reduce the noise and dust for explosive welding, honeycomb structure explosives covered by colloid water were put forward as explosive materials. Using stainless steel and Q steel as flyer plate and base plate respectively, explosive welding tests were carried out with different covering thicknesses. The dynamic parameters in the collision process were obtained by experimental measurement and theoretical calculation. The microstructure of the bonding interface was observed through optical microscopy and analyzed by welding window. The results showed that, compared to the explosive welding without covering, the impact velocity of flyer plates was increased by The impact velocity predicted by Gurney formulas was significantly larger than the measured value, however, after considering acceleration history, the calculated value was in good agreement with the experimental result. Metallographic analysis showed that wave bonding interfaces without defects such as voids and cracks were obtained when the welding conditions were within the welding window. However, voids and cracks were found at the bonding interfaces when the welding conditions were close and above to the upper limit of the welding window.

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Explosive Welding | SpringerLink

Experimental tests have been carried out by other researchers; have been considered to explosively welded aluminum and steel tubes in one step. The tests have been done using various stand-off distances and explosive ratios. Various interface geometries have been obtained from these experiments. In this paper, all the experiments carried out were simulated using the finite element method.

The flyer plate and collision velocities obtained from the analysis were validated by the pin-measurement experiments. The numerical results showed that very high localized plastic deformation produced at the bond interface.

Keywords: Explosive Welding, Johnson-Cook 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, metallurgical and other physical aspects of colliding metals, modeling of material behavior, sources of high rate energy and the geometrical parameters of colliding system of metals.

To analyze the process, the hydrodynamic analogy was used by various authors [1, 2, and 3] due to the creation of the high localized pressure and the material fluid like behavior at the collision zone. The process parameters are the impact velocity, the collision point velocity, the angle, the stand-off distance, the type of the explosive used and the detonation velocity, density and size and distributions of the explosive mix.

Welding windows were proposed to show the weld ability ranges of process parameters i. Nevertheless, the data were obtained by means of large number of experiments performed.

However, the process could be simulated using the 1- lecturer in mechanic Corresponding Author 2- lecturer in mechanic 3- lecturer in mechanic 4- lecturer in mechanic 1 finite element method and most aspects of the welding process could be obtained.

Few attempts have been reported in the literature to simulate the process. Al-Hassani [7] treated the problem as a normal transient loading of plane stress elements of rectangular shape. In this analysis, cinematically equivalent concentrated loads at the nodes represented the uniformly distributed explosive load.

Explosive welding process was simulated by Oberg [8] by means of Lagrangian finite Element computer code, but only produced jetting. The explosive welding process was also modeled by Akihisa [9].

He only produced waves but no jetting. In addition, the author assumed that symmetric or asymmetric shear flow distribution was generated in the flyer and parent plates and the modeling was performed based on this supposition.

The welded tubes had an external diameter of mm and internal diameter of mm.

The outer layer was made of steel, with the external diameter of and thickness of 4. The inner tube was made of Al with 5mm thickness. The explosive material was positioned inside the inner tube.

Explosion welding

In this investigation, all the experiments were simulated using the finite element method. The JWL equation of state was used to describe the behavior of explosive. The JWL equation of state has been developed for high explosive burn materials. Explosion welding EXW is a solid state solid-phase process where welding is accomplished by accelerating one of the components at extremely high velocity through the use of chemical explosives.

This process is most commonly utilized to clad carbon steel plate with a thin layer of corrosion resistant material e.

Due to the nature of this process, producible geometries are very limited. Typical geometries produced include plates, tubing and tube sheets. Unlike other forms of welding such as arc welding which was developed in the late 19th century , explosion welding was developed relatively recently, in the decades after World War II.

Its origins, however, go back to World War I , when it was observed that pieces of shrapnel sticking to armor plating were not only embedding themselves, but were actually being welded to the metal. Since the extreme heat involved in other forms of welding did not play a role, it was concluded that the phenomenon was caused by the explosive forces acting on the shrapnel.

These results were later duplicated in laboratory tests and, not long afterwards, the process was patented and put to use.

Explosion welding

In , DuPont applied for a patent on the explosion welding process, which was granted on June 23, under US Patent 3,, [2] and resulted in the use of the Detaclad trademark to describe the process. The response of inhomogeneous plates undergoing explosive welding was analytically modeled in Explosion welding can produce a bond between two metals that cannot necessarily be welded by conventional means. The process does not melt either metal, instead plasticizing the surfaces of both metals, causing them to come into intimate contact sufficient to create a weld.

This is a similar principle to other non-fusion welding techniques, such as friction welding. Large areas can be bonded extremely quickly and the weld itself is very clean, due to the fact that the surface material of both metals is violently expelled during the reaction.

Explosion welding can join a wide array of compatible and non-compatible metals; with more than metal combinations possible.

A disadvantage of this method is that extensive knowledge of explosives is needed before the procedure may be attempted safely. Regulations for the use of high explosives may require special licensing. From Wikipedia, the free encyclopedia.

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