Papers by Keyword: Explosive Cladding

Abstract: Explosive cladding employs a controlled chemical explosive detonation to craft a metallurgical bond between similar and dissimilar metals. Aluminum 5052-copper and aluminum 5052-aluminum 1100 plates are explosively cladded with a stainless steel wire-mesh, having 90⁰ orientation between them, at varied loading ratios (mass of explosive/mass of flyer plate). Microstructural, corrosion and mechanical properties of the clad were evaluated as per relevant standards and the results are presented. The dissimilar wire-mesh interlayered explosive clad reveal wavy topography, with the interfacial wave amplitude and wavelength proportional to loading ratio, R. The mechanical behavior of wire-mesh reinforced clad is better than weaker aluminum parent plate.

Abstract: This study focuses on effect of post weld heat treatment (PWHT) on interfacial and mechanical properties of Al 5052-SS 316 explosive clad with copper interlayer at varied loading ratios and inclination angles. The use of interlayer is proposed for the control of additional kinetic energy dissipation and to alleviate the formation of intermetallic compounds at the interface. The Al-Steel clads are subjected to PWHT at varied temperatures (300°C-450°C) for 30 minutes and the results are presented. The microstructural characterization of as-clad and PWHT samples is observed by an optical microscope and Scanning Electron Microscope (SEM). Maximum hardness is obtained at the interface of the as-clad and PWHT samples. Increase in PWHT temperature enhances the tensile strength of the composite, whereas, the tensile strength decreases at 300°C due to the diffusion of Al and Cu elements and the formation of detrimental intermetallic compounds.

Abstract: The article shows the results of research on tri-layer composite AA2519-AA1050-Ti Gr. 5 made by explosive cladding method. Performed bond was heat treated in different conditions. Four specimens were heated in 530°C in 30 minutes, and after adopted different ways of cooling for each specimen. Used cooling in air and water. Additionally two specimens were aged at 150°C for 600 minutes. Last joint was heated at 420°C for 60 minutes and after was cooled in still air. For obtained joint were performed mechanical and technological tests. Tests included tensile strength test, yield strength test, ram strength test and bend test. Moreover performed structural tests, analysis of the chemical composition and hardness measurements. Based on the results evaluated the quality of joint, and described the influence of heat treatment on the properties of obtained multilayer material. Was found that as a result of explosive cladding, hardness in the interface increased. Heat treatments at temperature 530°C do not change properties. Only the heat treatment at temperature 420°C is decreasing hardness in the interface and in the whole cross section of the AA2519 layer.

Abstract: In order to enhance the uniformity of cladding copper layer distribution over the bimetallic bar perimeter and length, the shape of the classical horizontal and vertical oval passes were modified. The rolling was carried out in the designed modified elongating grooves. The round Al-Cu bimetallic bars with an outer diameter of 22 mm and a copper layer share of 15 and 30%, after explosive cladding, were rolled on a D150 two-high shape mill. As a result of rolling in 4 passes, bars of a diameter of about 16.0 mm were obtained. By applying the modified grooves to the rolling of Al-Cu bimetallic bars, the stability of the rolling process was improved, whereby, finished bars with a uniform and tight cladding layer distribution over the core and small diameter dimensional deviations was obtained.

Abstract: In order to ensure the quality of charge, honeycomb structure explosives was designed to resolve the current issue about the backward method of charge; Explosives with structure of honeycomb and double sided explosive cladding are used to increase of energy efficiency of explosives and save the amount of explosives. In this paper, the experiment of double sided explosive cladding for stainless steel and regular steel was successful investigated. Compared to the existing explosive cladding method, the consumption of explosives for stainless steel to steel of Q235 are reduced by 77% in the case of cladding the same number of composite plates.The explosive cladding parameters were calculated before experiment. It has shown that the calculated parameters prefigure exactly the explosive cladding windows for stainless steel/regular steel.

Abstract: The contact corrosion phenomena occuring at the electrical networks when two dissimilar metallic parts are connected to each other causes serious technical and economical problems. One possible solution to reduce the contact corrosion is the application of properly prepared bimetallics. The paper introduces the explosive cladding technique which can be successfully applied for manufacturing bimetallics matched to the given electrical circuit furthermore application possibilities of the explosively cladded bimetallics at electrical networks, railway systems and vehicles.

Abstract: The application of the High Energy Rate Forming (HERF) represents a new paradigm in the field of production of knowledge-based more components materials: furthermore, joining by plastic deformation of the materials is carried out directly, by high speed, high energy shock waves, without using energy transforming equipment as hydraulic presses etc. The energy sources of the HERF processes are either the electrical energy stored in capacitors or chemical energy stored in the high explosives. High explosives can be utilized for many metalworking techniques; however the three main types of explosive metalworking are: Explosive welding and cladding Explosive tubeforming Explosive compaction of powders and granulates. The present work briefly introduces the principles and practices of the three main types of the explosive metalworking techniques mentioned above and discusses aspects of their numerical simulation.

Abstract: In explosive cladding, the kinetic energy spent at the dissimilar interface transformed into thermal energy and characterizes the quality of clad. Explosive cladding with interlayer enhances the kinetic energy utilization and restricts the intermetallic formation. The introduction of interlayer increases the heat transfer area and duration of collision and, consequently, the time available for thermal energy transferred into the metals. The thermal energy is transferred to the participant metals by conduction and convection. The influence of interlayer between flyer and base plates on weldability window, an analytical estimation is also reported.

Abstract: The paper presents investigation results for obtaining a semi-finished product in the form of round Al-Cu bimetallic bars by the explosion method. The systems and technological parameters of explosion welding were selected in such a manner as to obtain finished bimetallic bars of an outer diameter of approx. 22 mm and a copper area fraction of the bimetal cross-section of approx. 15 and 30%. In this work was made an analysis of microstructure changes and the microhardness distribution on the cross-sections of the stock materials. There were also made tests of layers connections quality by determining the maximum shear stress on the joint boundary. The results show that the explosive cladding method guarantee a permanent connection of copper layers and aluminum core.

Abstract: A considerable increase in interest in using corrosion resistant steel clad ribbed bars in the construction industry has been observed in recent years. This is owing to the particular properties of these bars, namely high durability and rigidity, good mechanical properties, and high corrosion resistance. Bimetallic ribbed bars can be manufactured in medium-size and small shape mills from previously produced bimetallic feedstock. The manufacture of ribbed bars with an outer layer of corrosion-resistant steel is a complicated process that involves numerous technological problems. The most important of which include the obtaining of bimetallic feedstock with the adequate strength of the bond in the region of junction between the core and the clad layer, and assuring the even plastic flow of both bimetallic layers during the process of rolling in the elongating and forming passes in the shape Mill. Failure to meet these conditions may result in a delamination of the bimetallic band during rolling or the formation of other defects, which will disqualify the finished bimetallic bar [1÷4]. In the paper the metallographic analysis of bimetallic ribbed bars steel-steel resistant to corrosion produced from bimetallic feedstock mill of the surfacing method TIG and of the method ESS LM received. Surfacing method TIG and ESS LM method are the affirmed processes the receipt the bars plated is characterizing the large strength of bond two different metals. Moreover, in this study, the authors present the bond strength of interface of bimetallic joint of the cross section on the test bar. The core was of the constructional carbon steel C45E and the clad layer was made of the corrosion resistant steel X2CrNi18-10. Plastometric tests were performed on a Gleeble 3800 plastometer owned by the Institute of Modelling and Automation of Plastic Working Processes, using strain rates of 0.1 s^-1, 1.0 s^-1 and 10 s^-1 respectively [1÷3, 7].