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Topic: Cold welding

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	Cold welding -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-11-02)
		Cold or contact welding was first recognized as a general materials phenomenon in the 1940s.
		In space applications cold welding in the forming stage may be adequate to produce usable hard parts, and molds may not even be required to hold the components for subsequent operations such as sintering.
		Gravitational differential settling of the mixture tends to segregate grains in the compress, and some degree of cold welding occurs immediately upon formation of the powder compress which generates internal frictions that strongly impede further compaction.
	www.absoluteastronomy.com /encyclopedia/c/co/cold_welding.htm (698 words)

	welding (Site not responding. Last check: 2007-11-02)
		Welding is the joining together of materials (typically metals or thermoplastics), usually by a fusion process.
		Most commonly, workpieces are welded by melting both of them and adding more molten metal or plastic to form a pool that cools to form a strong joint.
		Welding differs from soldering and brazing in that enough heat is applied to melt the materials to be joined.
	www.yourencyclopedia.net /welding.html (179 words)

	Types of Welding Processes
		Cold welding Cold or contact welding was first recognized as a general materials phenomenon in the 1940s.
		Forge welding Forge welding, the oldest known form of welding, is a welding process of heating two or more pieces of wrought iron or steel until their surfaces are malleable and then hammering them together.
		Gas welding In gas welding, the heat energy and high temperature needed to melt the metal is obtained by the combustion of a fuel gas with oxygen.
	www.weldprocedures.com /weldingprocesses.html (1776 words)

	Cold welding
		Cold or contact welding was first recognized as a general materials phenomenon in the 1940s.It was then discovered that two clean, flat surfaces of similar metal would strongly adhere if brought into contact under vacuum.
		Powders in powder metallurgy use cold welding to bestadvantage because they present large surface areas over which vacuum contact can occur.
		In space applications cold welding in the forming stage may be adequate to produce usable hard parts, and molds may noteven be required to hold the components for subsequent operations such as sintering.
	www.therfcc.org /cold-welding-11592.html (657 words)

	Solid State Welding
		Cold welding is a solid state welding process which uses pressure at room temperature to produce coalescence of metals with substantial deformation at the weld.
		Welding this metal to the clean metal of the abutting part is accomplished by diffusion across the interface so that coalescence of the faying surface occurs.
		Welding occurs when the ultrasonic tip or electrode, the energy coupling device, is clamped against the work pieces and is made to oscillate in a plane parallel to the weld interface.
	www.key-to-metals.com /Article51.htm (2111 words)

	Huestis Industrial - Cold Pressure Welding
		Cold pressure welding is a method for permanently joining nonferrous metals and their alloys without using heat, fillers or fluxes.
		The cold welder produces a weld that is stronger than the parent material without sacrificing electrical integrity.
		Using the proven multiple upset technique, the machine will cold weld the materials in seconds to provide a bond which is as strong as the parent material.
	www.huestismedical.com /productpgs/products_pwm.html (1056 words)

	The cold welding process is being used for more and more high-volume applications. (Site not responding. Last check: 2007-11-02)
		The cold welding process uses a magnetic field to rapidly collapse one component onto another forming a metallurgical bond.
		The magnetic pulse welding process works by dumping stored energy from a capacitor bank into a coil designed to transform the electrical energy into magnetic energy due to the rapid change in current in a short period of time.
		Magnetic pulse welding may also be ideal for joining the dissimilar materials used in aerospace applications, such as nickel to titanium.
	www.assemblymag.com /CDA/ArticleInformation/features/BNP__Features__Item/0,6493,98908,00.html (2149 words)

	What is Cold Pressure Welding (Site not responding. Last check: 2007-11-02)
		Cold pressure welding is a rather unique form of solid phase welding, it is unique because the welding is carried out at ambient temperatures while other forms of solid phase welding are carried out at elevated temperatures, although while these temperatures are high, the material is not molten, merely more ductile.
		The first scientific observation of cold pressure welding was in 1724 by the reverend J.I. Desaguliers, who demonstrated this phenomena to the royal society and later published the details in the scientific journal of the time.
		The hardness and temper of the die is most important as well, in the early days of cold welding, die breakage was very common, long after a machine was designed to weld 8mm copper rod there were problems in containing the necessary forces within a die of this size.
	pwmltd.co.uk /cpw.html (1395 words)

	Welding of Titanium Alloys
		To obtain full strength, the metastable beta alloys are welded in the annealed condition; the weld is cold worked by planishing, and the weldment is then solution treated and aged.
		The heated weld metal in the weld zone must be shielded from the atmosphere to prevent contamination with oxygen, nitrogen, and carbon, which will degrade the weldment ductility.
		For improved joint ductility in welding the higher strength grades of unalloyed titanium, filler metal of yield strength lower than that of the base metal is occasionally used.
	www.key-to-metals.com /Article28.htm (1238 words)

	stainless steel welding wires, saw welding, india (Site not responding. Last check: 2007-11-02)
		Welding of most of the 400 Series stainless steels call for maintaining preheat and interpass temperatures, and in some cases post-weld heating to avoid formation of brittle structure called martensite.
		As the welding head moves on along the joint, slag and metal separate by virtue of difference in their specific gravities, and on solidification, the weld metal makes the joint, and the slag will be chipped off.
		In the case of welding with flux cored wires, 100% CO2 and 75% Argon + 25% CO2 are used as shielding gases.
	www.elmechindia.com /Stainlesssteelwires.htm (2073 words)

	Welding Processes Welding Tutorial
		The AWS definition for a welding process is "a materials joining process which produces coalescence of materials by heating them to suitable temperatures with or without the application of pressure or by the application of pressure alone and with or without the use of filler material".
		Submerged arc welding is defined as "an arc welding process which produces coalescence of metals by heating them with an arc or arcs between a bare metal electrode or electrodes and the work piece.
		Resistance welding is "a group of welding processes which produces coalescence of metals with the heat obtained from resistance of the work to electric current in a circuit of which the work is a part, and by the application of pressure".
	www.arconweld.com /welding_faq/welding_tutorial.htm (1577 words)

	Cold Metal Transfer Has a Future Joining Steel to Aluminum 2005-06-038
		Welding speed depends on material thickness, torch position, and joint geometry and is in the range 30-70 cm/min.
		In the context of welding, "cold" is a relative term.
		In the cold metal transfer process (CMT), the workpieces to be joined and, especially, their weld zones remain considerably "colder" than they would with conventional gas metal arc welding.
	www.aws.org /wj/2005/06/038 (1609 words)

	Search Results for cold - Encyclopædia Britannica
		The rolling of cold strip begins with the retrieval of hot-rolled strip from a coil storage yard, which often uses fully automated cranes for setting and retrieving coils according to rolling...
		Cold welding, the joining of materials without the use of heat, can be accomplished simply by pressing them together.
		Cold shortening is the result of the rapid chilling of carcasses immediately after slaughter, before the glycogen in the muscle has been converted to lactic acid.
	www.britannica.com /search?ref=B04319&query=cold&submit=Find (535 words)

	Overview of types of weldings
		Fusion welding leads to a welding of the pieces by applying heat at the point of connection which fuses the pieces together and even joins a material.
		Unlike fusion welding, pressure welding depends on the application of high pressures and/or high temperatures, resulting in a strong plastification and a local deformation of the pieces to be joined in the welding area so that a bond between both pieces is made.
		Ultrasonic metal welding is a combination of cold-press welding and friction welding because of its mode of action.
	www.staplaultrasonics.com /c1-over/overview.htm (452 words)

	Applications and Advantages of the Ultrasonic Ring Welding Process
		The system is an advance cold welding technique with continuous welding speed of 2 meters/ minute and continuous monitoring of weld quality.
		Moreover, being a molecular welding technique, it requires a much smaller width of the weld to transfer the heat.
		As the technique uses cold welding process, the basic property of the copper tube and fin remains unchanged unlike in other mechanical processes where there is localized heating of the tube and fin.
	www.rooptelsonic.com /continousweldingc.html (232 words)

	Feature Article - Welding World: A Look At What's New To Use In Welding - 10/97
		The use of magnets for cold welding comes from behind the Iron Curtain...plastic welding grows in popularity...and other more traditional methods are gathered together here, as well as a few places for you to start if you're looking for information on the 'Net.
		It is a cold welding process that works when a magnetic pulse is used to create a high-velocity impact between two materials, causing a metallurgical bond.
		The CustomSelect is a 600-A MIG welding gun ergonomically designed with the EZ Twist swivel conduit, which reduces stress on welders' hands and wrists by letting them move the gun more easily.
	www.autofieldguide.com /articles/109708.html (2059 words)

	Cold pressure welding (Knowledge Summary)
		As the welds are made in the 'solid state' they are difficult to inspect; thus reliance must be placed on process control.
		With the exception of butt welds, or welds where the contact surfaces are sheared together, the thickness of the parts is reduced significantly at the weld.
		Perhaps the greatest use of cold pressure welding has been for joining of wire, foil to wire, wire to bi-metals, and sealing of heat sensitive containers such as those containing explosives (detonators for example).
	www.twi.co.uk /professional/getfile/ksedn002.html (659 words)

	Wire Technology International Company Profiles
		British company Pressure Welding Machines Limited, founded in 1984, is now the world’s market leader in design and manufacture of cold pressure welding machines and dies.
		This method is a cost-effective and environmentally friendly alternative to heat welding and creates a weld which is stronger than the parent material.
		Cold pressure welding is effective on virtually all non-ferrous metals.
	www.wiretech.com /profiles/pwi.html (596 words)

	Welding cold metal? Winter welding. - Pirate4x4.Com Bulletin Board (Site not responding. Last check: 2007-11-02)
		If you weld anything thicker you will have cold joints which is when you get little or no penitration.
		If you are welding on the frame I would find a bigger welder such as a 220 volt stick that can handle around 225 to 250 amps.
		B) With an 110V machine it is difficult to run it hot enough to ensure that all of the flux rises to the surface of the bead and is not entrapped.
	www.pirate4x4.com /forum/showthread.php?t=217955 (830 words)

	iaaoi1a (Site not responding. Last check: 2007-11-02)
		Cold welding consists of joining two flat, clean surfaces of a metal by contact and application of pressure.
		Cold welding works by joining the surfaces at the molecular level.
		In particular, using ceramic rollers to cold roll ultra-pure metals may result in a low-cost way of cold welding.
	lifesci3.arc.nasa.gov /Spacesettlement/spaceresvol3/iaaoi1a.htm (427 words)

	Welding HQ : Welding
		Specialist in aluminium welding and fabricating of mild and stainless steel forlarge metal sculptures for public display.
		Welding HQ does not warrant or guarantee the accuracy or completeness of the content available on this Website.
		Welding HQ excludes all liability of any kind (including negligence) in respect of any third party information or other material made available on, or which can be accessed using, this Website.
	welding-hq.com (736 words)

	welding on Encyclopedia.com (Site not responding. Last check: 2007-11-02)
		Cold-pressure welding is accomplished by the application of high pressure at room temperature; forge welding (forging) is done by means of hammering, with the addition of heat.
		The use of argon prevents slag from forming in the weld and greatly increases the speed of the welding.
		Pulse welding aluminum: advances in equipment and ongoing training can keep you at the forefront of this growing trend.
	www.encyclopedia.com /html/w1/welding.asp (598 words)

	welding technology, arc welding electrode, india (Site not responding. Last check: 2007-11-02)
		The widespread use of metals in everyday life from household gadgets to industry and spacecraft has led to an increase in the demand for all types of metals like iron, steels, aluminium and its alloys, cobalt, chromium, nickel etc. Cost of these metals has risen steadily and resources are depleting fast.
		Welding necessitates heat input that generates stress on the metal being reclaimed.
		As shown in the example of cast iron welding, proper procedure and care is needed to achieve success in any reclamation job.
	www.elmechindia.com /fontechnology.htm (700 words)

	Cold Welding (Site not responding. Last check: 2007-11-02)
		Cold welding uses pressure applied to the workpieces in dies or rolls.
		It is important that both surfaces are mutually soluble, that intermetallic compounds do not weaken the joint.
		To obtain the desired bond strength, the mating surfaces are chemically cleaned and wire-brushed a common requirement.
	tristate.apogee.net /et/extjc.asp (85 words)

	cold fusion soldering gun welding (Site not responding. Last check: 2007-11-02)
		cold solder gun wave solder optimizer american solder solder joint plumbing solder.
		welding, and cold welding are used for aluminums.
		Welding: fusion welding, solid state welding, brazing, and soldering...
	www.1welding-online.com /11/cold-fusion-soldering-gun-welding.html (495 words)

	Cold Weld (Site not responding. Last check: 2007-11-02)
		weld county tuesday weld jb weld weld county colorado weld racing wheels how to mig weld...
		The nora® two-component cold weld compound comes in 50 colors and is suitable for all norament...
		It is as permanent and durable as a hot solder weld, and is an...
	www.e-welders.info /welders/cold-weld.html (437 words)

	Pressure Welding Machines Ltd.
		British company, PWM, is a world leader in the design, manufacture and supply of high quality, cold pressure welding equipment and dies.
		Fast, economical and easy to use, PWM cold welders guarantee a reliable weld on non-ferrous wire and strip, without heat, flux or filler.
		PWM dies are of the industry standard type and are manufactured to suit round or profile wires and rod.
	www.wireworld.com /client000160.html (134 words)

	The new revolution in digital GMA welding: CMT: News from TPS-Fronius
		In the context of welding, 'Cold' is a relative term, of course.
		Indeed, the combination of integrated wire motions, reduced thermal input and freedom from spatter means that welding and brazing can now be used for certain applications which used to be 'off limits' to them, as well as delivering benefits such as higher productivity and lower costs for rejects and post-weld machining.
		Optimum cooling of the robot welding torch is ensured by the sturdy and dependable water-cooled FK 4000 R cooling unit.
	www.processingtalk.com /news/tps/tps113.html (1283 words)

	Bearing design, manufacture and maintenance - Hydrochloric acid to disintegrate rust to remove pin in bearing (Site not responding. Last check: 2007-11-02)
		If the pin and bearing are from stainless steels then it might be a cold welding between the pin and the bearing inner race.
		But as i said, i don't think it is cold welding because it moved a little when we put a high load onto it (I think that this is the rust on the inside of the inner ring binding up the pin).
		Although all indications are that it is corrsion rather than cold welding due to the fact that there is rust staining on the stainless pin...
	www.eng-tips.com /viewthread.cfm?qid=102763 (1426 words)

	Welding cold-rolled steel to cast iron (Site not responding. Last check: 2007-11-02)
		Peening while the weld deposit is still warm (or as it cools) can help to improve the properties of the deposit and help refine the metallurgical structure.
		Peening works the metal and expands it, which counteracts the shrinkage (which causes the cracking) that occurs or may occur during the cooling.
		Elmer Swank Jr., CWI/CWE, is a technical instructor with the Hobart Institute of Welding Technology, 400 Trade Square East, Troy, OH 45373, 800-332-9448 ext.
	www.thefabricator.com /Articles/Welding_Article.cfm?ID=570 (228 words)

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