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Topic: Electron beam welding

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	Joining Technologies News: Electron Beam Welding
		Electron beam welding is a phenomena that is thoroughly understood by scientists and engineers that have studied the process in the research lab, but very little information is published for those of us that want to know more about the welding process performed with electron beam energy.
		The focused beam of electrons is directed at a targeted location on the weld joint at which point the kinetic energy of the electrons is converted to thermal energy.
		Beam Deflection - The movement of the electron beam by the electromagnetic coils or by undesirable magnetic or electrical fields.
	www.joiningtech.com /news/electronbeamweldin_21 (1775 words)

	Beam Welding and Thermit Welding
		Electron beam welding (EBW) is a welding process which produces coalescence of metals with the heat obtained from a concentrated beam composed primarily of high-velocity electrons impinging upon the surfaces to be joined.
		When using the laser beam for welding the electromagnetic radiation impinges on the surface of the base metal with such a concentration of energy that the temperature of the surface is melted and volatilized.
		The welding characteristics of the laser and of the electron beam are similar.
	www.key-to-steel.com /Articles/Art79.htm (1824 words)

	Electron Beam Welding
		The electrons are accelerated from the source with high voltage potential between a cathode and anode.
		The potential energy of the electrons is transferred to heat upon impact of the workpiece and cuts a perfect hole at the weld joint.
		The electron beam stream and workpiece are manipulated by means of precise, computer driven controls, within a vacuum welding chamber, therefore eliminating oxidation, contamination.
	www.ebteccorp.com /ebweld.html (376 words)

	electron beam welding, weld process with electrons, electron beam weld
		Electron beam welding is the fusing together of two or more materials using a beam of high-velocity electrons.
		The beam of high-velocity electrons impinges upon the material to be welded where it is focused to a minute spot by electromagnetic lenses.
		The energy input to a weld is approximately proportional to its cross-sectional area, so the energy requirement for electron beam welding is 4 percent of that required by other fusion welding processes.
	www.purolator-facet.com /ebeam.htm (508 words)

	Paton Welding Institute - Electron Beam Welding
		Beam current is measured in a circuit of this insulated sensor.
		Longitudinal sections of the welding electron beams, formed by new (above) and utilized (48 hrs) cathode (below) with the requirement: Replace cathode, because the focus position and current density are changed essentially.
		Electron beam analyzer is assembled inside industrial 19 rack / panelmount workstation with added A/D and D/A converters and deflecting pulses generator.
	www.nas.gov.ua /pwj/beam/i13c.html (291 words)

	Electron beam welding machine - Patent 4093843
		An electron beam welding machine incorporating a surface seal system which continuously seals the weld chamber located in an indexing table while such chamber is indexed beneath a seal plate carrying the surface seal material.
		This invention relates to an electron beam machine and more particularly to such a machine including an indexing table containing a plurality of individual welding chambers which must be loaded with the part to be welded and pumped down to a welding vacuum.
		Electron beam machines of the type contemplated by this invention must necessarily incorporate some sort of sealing arrangement between a member which carries the electron beam gun and the rotating indexing table to achieve and maintain the necessary vacuum pressures required for electron beam welding.
	www.freepatentsonline.com /4093843.html (1713 words)

	ISF:Beam Welding
		The impact of the beam electrons on the workpiece increases the kinetic energy of the workpiece atoms which leads to the heating of the metal.
		The electron beam welding machine consists mainly of the beam generator which generates and deflects the electron beam, the vacuum chamber (the workpieces to be welded) and the vacuum-generating pumps which evacuate the beam generator and the vacuum chamber.
		In electron beam welding, the determination of process parameters is connected with time-consuming and expensive welding tests, as, up to now, no adequate alternative exists as far as expenditure of time or the quality of the obtained results are concerned.
	www.isf-aachen.de /eng/arbeitsg/forschung/strahl.html (3479 words)

	Used Robots.com: Electron Beam Welding
		Electron Beam Welding (EBW) is a fusion joining process that produces a weld by impinging a beam of high energy electrons to heat the weld joint.
		Electrons are elementary atomic particles characterized by a negative charge and an extremely small mass.
		Raising the electrons to a high energy state by accelerating them to roughly 30 to 70 percent of the speed of light provides the energy to heat the weld.
	www.used-robots.com /electron-beam-welding.htm (210 words)

	Creative Instrumentation - Electron beam welding (EBW) (Site not responding. Last check: 2007-10-14)
		Electron beam welding is a reliable and efficient method of joining together a wide range of metals and is especially suited to the joining of precision foils 0.05mm thick and above.
		Traditional post welding operations such as machining, straightening, cleaning and heat treatment can often be avoided, thus allowing the electron beam welding operation to be the final step prior to final assembly.
		Electron beam welding must be performed under vacuum, so the workpiece is placed in a chamber which can be evacuated.
	www.creativeinst.com /ebw.html (395 words)

	Characteristics of electron beam welding: Process is suitable for fabricating structures, difficult steel and aluminum ...
		Electron beam welding is useful for many applications -- steel, aluminum, and exotic metals; thick, structural sections or thin, delicate components; and harsh conditions such as alternating loads and low temperatures.
		EBW often is used in applications that have stringent joint tightness and strength requirements and, in some cases, it is used for welds that cannot be done with any other joining method.
		EBW also is suitable for a variety of difficult applications, such as welding structures on which the reverse side of the butt is inaccessible; gravity welding of thin metal; and welding in various spatial positions.
	www.thefabricator.com /ShopManagement/ShopManagement_Article.cfm?ID=1208 (1759 words)

	Electron Beam Welding:: KL 117 machine
		The RASTR system, functioning on the principles of raster electron microscope, provides an opportunity to watch the welding process and automatic coincidence of each of three beams of electrons with the butt joints of groove faces in the real time mode.
		The clear picture of the welding process is displayed on the monitor screen and is not exposed to the welded metal vapors, which is characteristic for traditional optical observing systems.
		The assembled drill bit is brought to welding area by the table disposed on the left of the lower chamber.
	www.nas.gov.ua /pwj/beam/kl_117.html (755 words)

	СЭО - Electron beam welding machine DI EBW-50
		It is possible to apply also on materials to be welded with difficulties (copper, aluminium, stainless steel, titan and their combinations), on parts with highly different thickness.
		The welds are typical with their small width and relatively remarkable depth, surface finishing is not usually necessary.
		Welding needs a small amount of energy and therefore the thermal load of parts and deformations are minimal.
	seo.ru /production/23 (161 words)

	Viewing optics for external-mount electron beam welders - Patent 4803333
		This invention relates to the art of electron beam welding within a vacuum chamber and has specific reference in particular to an optical system for viewing the workpieces to be welded from outside the vacuum chamber, either before or during the welding operation.
		The electron gun utilized for generating a beam of electrons may be either the relatively low-voltage type; that is, one that accelerates electrons to a maximum of 60,000 electron volts; or one of the high-voltage type, in which the electrons are accelerated to 150,000 electron volts or more.
		The beam tube [31] is fabricated of metal and also serves as an electrostatic shield to prevent stray charges from building up on the glass optics and deflecting the electron beam.
	www.freepatentsonline.com /4803333.html (3118 words)

	Anionics Inc. Electron Beam Welding, Dunnage Washing, Vacuum Impregnation
		EBW is a fusion joining process that produces coalescence of the metals with heat from a high energy electron beam focused on the weld joint.
		Electrons are generated by heating the filament located in the electron beam gun.
		EBW is particularly suitable to any application that requires minimized distortion and shrinkage during welding, welding in a close proximity to heat sensitive components or attachments, or hermetic seal welding of evacuated enclosures while retaining a vacuum inside the component.
	www.anionics.com /ebw_weld.html (239 words)

	Calweld LLC - The Electron Beam Welding Process (Site not responding. Last check: 2007-10-14)
		The electron beam welding process delivers very high energy density at the weld joint and is operated in a high vacuum.
		Electron beam welding is a high energy density welding process that produces welds which are smaller and have less distortion and are often stronger than those of arc welding processes.
		The range of focus and the energy density of the electron beam allow welding to be performed in either the conduction mode similar to GTA welding or the "keyhole" welding mode where deep penetration in a single pass is achievable.
	www.calweldllc.com /ebwp.htm (484 words)

	Acceleron : Electron Beam Welding / EB Welding : Technical Data Library
		In simple terms, electron beam welding (EB Welding) is accomplished by heating a tungsten filament which then releases a stream of electrons through an electromagnetic field, focusing them into a precise beam of energy less than.010" (0.254 mm) in diameter.
		As the beam penetrates the surface of the work piece, using no filler and with a heat concentration of up to 500 times that of conventional welding methods, electrons transform metal beneath the beam through a molten state to a gas, allowing the beam to travel deeper and deeper.
		As the beam penetrates the material, the small gas hole produced closes rapidly, and the surrounding molten metal then fuses, causing minimal distortion and heat effect outside the weld zone.
	www.acceleroninc.com /techdata/ebweld.htm (314 words)

	Electron Beam Welding Services by Electron Beam Engineering
		Our welding technicians have a minimum of 5 years experience, and are dedicated to quality electron beam and laser welding workmanship
		We are the only electron beam welding and machining job shop in the United States that designs Electron Beam and Laser Welding equipment and industrial machined components.
		We have six electron beam welders and two Lasers, and always maintain spare capacity for the rush jobs that are required "yesterday".
	www.electronbeamwelding.com (240 words)

	Electron beam welding (Site not responding. Last check: 2007-10-14)
		Important variations of temperature field versus electron beam deviation relatively to the junction (from rather asymmetric one when the beam is displaced on the side of low conducting Inox up to a symmetric temperature distribution when electron beam is displaced on the side of high conducting Cu) is shown in Fig.
		It is found that the surface temperature is decreasing when electron beam is passing a series of holes, later on the temperature is increasing up to its steady state value.
		A deviation of electron beam trajectory from a junction also may be detected by temperature monitoring (Fig.
	www.imp.cnrs.fr /groupe3/pyrom/EBeng.htm (370 words)

	What Is Electron Beam Fusion Welding (Site not responding. Last check: 2007-10-14)
		Generated by an "electron gun", the stream of electrons travels at up to 60% of the speed of light.
		The high purity of the electron beam process permits welding of reactive materials that are very sensitive to contamination.
		Electrons have no chemical or material properties, and because the welding is performed in a hard vacuum, the fusion zone is kept contaminant free.
	my.execpc.com /57/77/ebfusion/whatis.html (215 words)

	IFE Electron Beam Welding (Site not responding. Last check: 2007-10-14)
		Electron Beam Welding is a high energy density welding method.
		Electron Beam welding is used in the aircraft and aerospace industries for producing high quality welds in titanium and titanium alloys.
		This is due to the fact that the welding is performed in a high vacuum atmosphere where low weld contamination is achieved.
	wopr.ife.no /~titan/eb_weld.html (292 words)

	Electron-Beam-Welding, Laser Beam Welding: neat and fast for thick and hard
		The outstanding characteristic of this class of Electron-Beam-Welding and Laser Beam Welding processes is that their power density stands way out of what is achievable with other more classic methods.
		Electrons are negative charged particles, and as such they are influenced and driven around by electromagnetic fields.
		However there are also Electron-Beam-Welding machines where the electron beam already concentrated and focused, exits the high vacuum space and is permitted to run in air for a very limited distance to the joint.
	www.welding-advisers.com /Electron-Beam-Welding.html (1653 words)

	Wentgate Dynaweld - Electron Beam Welding
		Electron beam welding gives engineers the freedom to simplify designs and reduce manufacturing costs by allowing complex finished components to be fabricated from separate parts that are then welded together.
		Traditional post welding operations such as machining, straightening, cleaning, polishing and heat treatment can often be avoided.
		Electron beam welders use a focused beam of electrons to give a spot of high energy density.
	www.wentgatedynaweld.com /electronbeam.asp (181 words)

	Electron Beam Welding (Site not responding. Last check: 2007-10-14)
		Our mission is to offer the highest quality possible in electron beam welding in a quick, cost-effective manner.
		Our superior knowledge of electron beam welding technology and techniques allows us to provide to our customers a level of expertise and confidence unsurpassed in the electron beam welding industry.
		Electron Beam Welding, Inc. customers include a wide variety of respected aerospace, electronics, scientific research, nuclear and general manufacturing companies on the West Coast, as well as many industrial and commercial manufacturers throughout the United States.
	www.electronbeamweldinginc.com (169 words)

	Electron beam welding - SKB
		In EBW, the copper in the canister tube and lid melts when a powerful stream of electrons hits it, causing the parts to be fused together.
		The electrons are accelerated to two-thirds of the speed of light by an electron gun.
		The distribution of electrons in the electron beam also controls the quality of the weld.
	www.skb.se /templates/SKBPage____8805.aspx (150 words)

	Electron beam welding - materials aspects (Knowledge Summary)
		The duplex and austenitic materials are commonly alloyed with nitrogen and thus welding procedures must be developed which minimise the risk of porosity formation due to nitrogen outgassing and which compensate for the detrimental effect of nitrogen loss on phase balance and stability.
		Cleaning prior to welding is especially important and the majority of weld defects that occur are often a consequence of poor cleaning practice.
		The extreme power density associated with the electron beam and the ability to work in a vacuum environment make it possible to use the process for joining metals which not only have high melting points but also those which are extremely reactive when hot or molten.
	www.twi.co.uk /j32k/getfile/kscsp001.html (1324 words)

	Joining Technologies Electron & Laser Beam Welding
		Our electron beam welding experience stretches back to the mid-seventies, when electron beam welding was just earning its acceptance as a manufacturing process in industry.
		Today electron beam welding is a widely used and accepted process for many product manufactures throughout the world.
		Laser welding is a natural transition from electron beam welding, and as with electron beam welding, we have become efficient and highly qualified end-users of this exceptional process.
	www.joiningtech.com /Services/Laser_Beam_Welding (554 words)

	Wentgate Dynaweld - Electron Beam Applications
		Electron beam welding has become a vital technology in many industries.
		The particular features and benefits of the technology to each application are highlighted to show how electron beam welding has made the specific manufacturing process possible, more certain or economical.
		In several cases electron beam welding is the only technology that could be used to achieve the desired result, in others it has streamlined the manufacturing process or made it more economical and in others its deployment has allowed the use of specialist metals in particular combinations that would otherwise not be possible.
	www.wentgatedynaweld.com /ebapplications.asp (235 words)

	Electron beam welding - Equipment (Knowledge Summary)
		Electron Beam Welding (EBW) is a fusion process for joining metals which uses a highly focused beam of electrons as a heat source.
		It is also possible to project high power electron beams into the atmosphere and produce single pass welds in steel in thicknesses of more that 40mm, but the weld width is typically greater than welds made in vacuum.
		Electron beam welding equipment typically comprises of an electron gun, high voltage power source, vacuum chamber or enclosure, pumping equipment and a workpiece or gun manipulator and control system.
	www.twi.co.uk /j32k/getfile/ksas001.html (638 words)

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