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 application of explosive welding has unique advantages in joining metals that would frequently be incompatible, such as titanium or zirconium and steel. Explosive welding free download as powerpoint presentation. To enhance the material performance, a high energy rate forming technique is of great importance to industry, which relies on a long and trouble free forming process. Compaction test of soil astmd698 linkedin slideshare. Underwater explosive compaction is a modified explosive compaction process that is used for manufacturing of parts by compaction of hard powders such as tungsten powder. Pup44 explosiue welding, forming,plugging, andcompaction presentedat thepressurevessels andpipingconference asmecentury2 emergingtechnologyconferences sanfrancisco,california august1215,1980 sponsoredby thepressurevesselsandpiping division,asme edited by i. In comparison with the other occurring interface geometries, flatsmooth or continuous melted, the wavy interface is the one producing the best welding characteristics14151617.
Materials selection, welding, forming, heat treatment, corrossion, ndt. Numerical and experimental studies on the explosive welding of. Explosive welding forming and compaction by t z blazynski. Consequently, the bond of explosive welding is a combination of. New explosive welding technique to weld springerlink. Abstracta detailed study has been carried out of the structures produced by the dynamic compaction of tool steel powder and used to deduce information on the processes occurring during compaction. Blazynski tz ed explosive welding, forming and compaction. Scribd is the worlds largest social reading and publishing site. Explosive weldingcladding room temperature process dissimilar and similar metal welding e. The degree of compaction of a soil is measured in terms of its dry unit weight. Guidebook for the fabrication of nondestructive testing.
Preamble compaction is the process of densification of soil by reducing air voids by mechanical energy. Effect of explosive characteristics on the explosive. The known input is radial pressure distribution at the conclusion of compaction, and the output is the corresponding radial pressure distributions that prevail after the compaction pressures are removed. In designing partial penetration butt welds, the designer determines the penetration required and the fabricator chooses the weld preparation to achieve the penetration specified, based on his welding processes and the corresponding weld procedures. Diggle although used for over 70 years, explosive compaction ec has not attained widespread acceptance despite the attraction of low cost and ease of treating large depths. Standard test method for compressibility of metal powders. Explosive welding, forming and compaction 1983 john pearson. Explosive welding, cladding, high mn steel, low c steel.
Tisteel, sscu, alsteel, nisteel, also titi welding of surfaces planarcurved, sheetfoil local welding seam weld. Prummer introduction it is the wish of each powder metallurgist to possess a press with great capacity for developing high pressures. A notable characteristic of explosive welding is the formation of waves. Applications and capabilities of explosive forming. The last two decades have seen a steady and impressive development, and eventual industrial acceptance, of the high energyrate manufact turing techniques based on the utilisation of energy available in an explo sive charge. But the price difference would be more and same time written confirmation shall be obtained from the client. Explosive welding, forming and compaction springerlink. An explosion welding method in which plating material is explosion welded to a base material with the aid of a reflected percussion wave generated by a detonating charge. The wires between the flyer and the target form an impact angle during the welding. Explosive welding, forming, and powder consolidation.
Models for compaction and ejection of powder metal parts. Compacting of metal powders politechnika krakowska. Explosive welding explosive material welding scribd. Lack of familiarity with the method, and an empirical design. Alms plates were successfully welded using this low vod explosive. Although the cost of a laser power supply for welding and cutting is quite high compared to arc welding power supply, give specific reasons why the use of lasers for welding or cutting can be cost justified. Although academia has acknowledged explosive welding as a novel and fascinating process, with several specific exceptions, industry has been slow to realize its potential and the possible composites that it makes available. This process is most commonly utilized to clad carbon steel plate with a thin layer of corrosion resistant material e. A notable characteristic of explosive welding is the formation of waves at the interface between the welded materials.
On the compaction of metal powders with particular. The wavy interface formation, as well as the distributions of. Effects of lubricant and part geometry on the ejection. These clad materials are commonly used today in chemical process vessel construc tion. Explosive welding, forming and compaction john pearson auth. What is explosive welding and in what applications is it. Detonating a charge above the plate rapidly forces the metal into the desired shape. Explosive welding of alms plates and its interface characterization. Manufacturing technology division, national technical university of athens, iroon polytechneiou str 9, zografou campus, 15780, athens, greece. This wps shall be used in conjunction with the general welding standards gws and welding fabrication procedure wfp sections and criteria for joint details, repairs, nde, inspection etc. The weldable region for various aluminum alloys is decided by the change in collision velocity and kinetic.
Design of fillet welds and n partial penetration butt welds. Mechanical properties of lapwelded reinforcing steel bars used for repairing damaged reinforced concrete structures, journal of materials and structures, v37, dec. Explosive welding, forming and compaction 1983 john. Some of the compacting powder is seen to melt during compaction while subsequent solidification occurs so rapidly that metastable structures are produced. In comparison with the other occurring interface geometries, flatsmooth or continuous melted, the wavy interface is the one producing the best welding characteristics 17. After the welding of each pass, the test piece may be. When water is added to the soil during compaction, it acts as a softening agent. Explosive compaction of powders, principle and prospects. Explosiue welding, forming,plugging, and compaction. Numerical simulation of underwater explosive compaction. The process of explosive cladding, or explosive metal welding, has been understood for decades. For this reason the hot isostatic pressing procedure was developed. The aim of this study was to investigate the strength of explosive welded metals with the same chemical compositions.
The technique can be used on land, under water, and in nearshore marine conditions. Introduction explosive welding is a solidstate process in which controlled explosion force is applied to join 2 or more. If you have any comments or questions about the glossary, please contact dan davis, editorinchief of the fabricator. Standoff distance flyer plate base plate explosive vc vp jet direction of welding. Explosive compaction is carried out by setting off explosive charges in the ground. Powder metallurgy pm metal processing technology in which parts are produced from metallic powders in the usual pm production sequence, the powders are compressed pressed into the desired shape and then heated sintered to bond the particles into a hard, rigid mass pressing is.
The energy released causes liquefaction of the soil close to the blast point and causes cyclic straining of the soil. Explosive welding, forming and compaction john pearson. Investigation of explosive welding parameters and their. Explosive compaction of powders, principle and prospects r. Explosive forming is a metalworking technique in which an explosive charge is used instead of a punch or press. The invention is characterized by placing the explosive charge 1 on that surface of the base material 3 which is remote from the ultimate bonded surface. This clad plate is typically used in the chemical and petrochemical industries as tube sheet for heat exchangers. The compacted sand was utilized as an anvil to avoid the elastic recoil.
Compacting of metal powders 10 according to equation 4. Different welding interfaces straight, wavy and continuous solidifiedmelted were used with changing explosive welding parameters standoff distance s, explosive loading r and anvils. This presentation will focus on the different uses and methods of explosive forming in the aerospace as well as automotive industry. Despite being one of the most investigated phenomena in t. This process is experimental and the keywords may be updated as the learning algorithm. The avesta welding manual, practice and products for stainless steel welding, sweden. This is a pdf file of an unedited manuscript that has been accepted for publication. Click here to purchase online table of contents executive summary market environment. Joined metals were investigated under heattreated and untreated conditions. Welding consumables deposition of a weld metal pad for. The explosive welding technique has found major use for cladding low cost plate usually carbon steel with more expensive corrosion resistant materials. On the compaction of metal powders with particular reference to densification hardening author. Numerical and experimental studies on the explosive welding of tungsten foil to copper.
Cladding of high mn steel on low c steel by explosive welding. Mechanical properties of welded deformed reinforcing steel. In the present research work, equation of state eos for tungsten powder was determined by a theoretical method and numerical simulation of the underwater explosive compaction process for tungsten powder was done. Sanok, aiaa 20003406, explosive joining for the mars sample return mission, 36 th aiaaasmesaeasee joint propulsion conference and exhibit, july 1719, 2000. Download file pdf explosive welding forming and compaction by t z blazynski residual stress stress wave acoustic impedance special assembly explosive welding. Sorry, we are unable to provide the full text but you may find it at the following locations. Compaction test of soil soil mechanics standardization. Explosive welding exw 7 explosion welding is a solidstate process characterized by a highvelocity impact between two materials as the result of controlled detonation of an explosive. These keywords were added by machine and not by the authors. Utilize numerical and theoretical solutions for evaluation of actual explosives systems and device. This cyclic strain process increases pore water pressures and provided strain amplitudes and numbers of cycles of straining are sufficient, the. Introduction explosive welding is a solid state metal joining. Strickland, the industrial exploitation of explosive forming, paper 17, in. It can be used on materials for which a press setup would be prohibitively large or require an unreasonably high pressure, and is generally much cheaper than building a large enough and sufficiently highpressure press.
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