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Topic: Induction welding

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Welding

Electromagnetic induction

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	Device for induction welding - Patent 4571472
		A device for induction welding is provided according to the teachings of the present invention.
		The present invention relates to a device for induction welding of constructional elements having an electrically conducting material in the area of the welding region and a material which is sealable by heat and subsequent cooling.
		The conical end 14 of the welding tool 10 is inserted to an operative position and the welding area of interest thus comprises the region between the top of the container 19 and the upwardly directed flange over the cover 18.
	www.freepatentsonline.com /4571472.html (1486 words)

	Induction welding -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-11)
		Induction welding is a form of (Fastening two pieces of metal together by softening with heat and applying pressure) welding that uses (additional info and facts about electromagnetic induction) electromagnetic induction to heat the workpiece.
		The welding apparatus contains an (A coil for producing a high voltage from a low-voltage source) induction coil that is energised with a (additional info and facts about radio-frequency) radio-frequency (A flow of electricity through a conductor) electric current.
		coatings and adhesives) plastics can be induction-welded by implanting them with metallic or ferromagnetic compounds, called susceptors, that absorb the electromagnetic energy from the induction coil, become hot, and lose their heat energy to the surrounding material by thermal conduction.
	www.absoluteastronomy.com /encyclopedia/i/in/induction_welding.htm (202 words)

	Basics of Design Engineering - Fastening & Joining - Joining - Joining Plastic
		Vibration welding: Vibration welding produces pressure-tight joints in circular, rectangular, or irregularly shaped parts made from almost any thermoplastic material -- even in dissimilar materials having a melt-temperature spread as great as 100°F. The process is particularly suited for hollow, container-type components having the weld joint in a single plane.
		Induction welding is a high-cost technique and is suitable for difficult-to-weld plastics such as polypropylene, and for shapes that cannot be fitted into an ultrasonic welding machine.
		Welding speed is a function of dielectric-loss factor, material thickness, and the area subjected to the voltage.
	www.machinedesign.com /BDE/FASTENING/bdefj1/bdefj1_5.html (1511 words)

	Welding - Open Encyclopedia (Site not responding. Last check: 2007-10-11)
		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.
	open-encyclopedia.com /Welding (124 words)

	[No title] (Site not responding. Last check: 2007-10-11)
		Induction welding is a type of forge welding where the faying surfaces are heated to hot working temperature by induction heating and then rapidly pressed together to produce the weld.
		Further, where the parts to be welded are induction heated to the hot working temperature, it is possible to greatly reduce the rotational velocity of the workpiece which has great practical significance to the butt welding of long sections of pipe, as in the application of pipeline construction.
		As soon as the induction coil 9 is retracted clear from between the opposing ends of the workpieces, the main forging rams 37 push the subframe 38 on parallel shafts 39 toward the stationary workpiece with the prescribed force per unit of workpiece cross sectional area.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=00/25973.000511&ELEMENT_SET=DECL (8187 words)

	Millerwelds :: Education :: WELDERS TURN TO INDUCTION HEATING FOR PREHEATING, STRESS-RELIEVING (Site not responding. Last check: 2007-10-11)
		Induction heating's similarity to resistance heating is that conduction is required to heat through the section or part.
		Welding operators had to remove a conventional insulating blanket from the thick part frequently to apply heat and keep the part at the correct temperature.
		Induction heating was able to shave two hours off the time-to-temperature (600 degrees F) and another hour to reach soak temperature (600 degrees F to 1350 degrees F) for stress relieving.
	www.millerwelds.com /education/tech_articles/articles24.php (1981 words)

	[No title] (Site not responding. Last check: 2007-10-11)
		In thermal welding, one or more of the plastic parts to be joined are placed close to or in contact with a heat source such as a hot plate or other appropriately shaped hot element device to melt the plastic at which time the parts are then pressed together to form the welded joint.
		Induction welding uses a material that is susceptible to heating in an induction field that is implanted within the thermoplastic matrix.
		In lap welding, an additional fitting, referred to as a coupling or collar, is slipped over the end portions of the pipes and joined to the exterior pipe surface by melting the interior surface of the coupling and/or the exterior surface of the pipe or by using a solvent or adhesive.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=00/02723.000120&ELEMENT_SET=DECL (6964 words)

	Electromagnetic induction - Wikipedia, the free encyclopedia
		Electromagnetic induction is the production of an electrical potential difference (or voltage) across a conductor situated in a changing magnetic flux.
		Michael Faraday is generally credited with having discovered the induction phenomenon in 1831 though it may have been anticipated by the work of Francesco Zantedeschi in 1829.
		Electromagnetic induction underlies the operation of generators, induction motors, transformers, and most other electrical machines.
	en.wikipedia.org /wiki/Electromagnetic_induction (320 words)

	MIAB welding of thick-walled pipe ends
		Under the action of the welding arcâs natural magnetic field and a high gradient of the external magnetic field induction, the arc is forced out from the arc gap at the initial moment and moves on the inside edges of the pipe ends.
		With this movement, the welding arcâs heat energy is distributed at the edges uniformly, but at a lower welding current density over the larger area of the welded section than that occupied by the active spots of the arc column.
		The welding arc, controlled by the magnetic field, is shifted to the outside edges of the thick-walled pipe ends, in the area of a maximum value of the magnetic field induction.
	www.thefabricator.com /Articles/Tube_And_Pipe_Article.cfm?ID=928 (1378 words)

	Welding
		When assembly by spin welding is proposed, a series of prototype evaluations should be done to determine the rotation speed and time, pressure, and holding time that suits the application.
		In induction welding of thermoplastics, heat is supplied to the plastic components by a metal member positioned in an electromagnetic field.
		Induction welding is relatively fast and clean, lends itself to use with most thermoplastics, and allows welding of parts having irregularly contoured surfaces.
	www.dow.com /sal/design/guide/welding.htm (805 words)

	The E.O.Paton Electric Welding Institute (PEWI) - Proposals - Pressure welding
		The percussion capacitor-type welding is a variety of the resistance butt welding using an impact mechanical load applied during and after the arc discharge, which fuses the abutted surfaces of the metallic billets.
		Types of welded joints: butt welding of similar and different diameters (the large diameter is not limited); T-joint welding of wires to flat, cylindrical or spherical surfaces; welding of multicore wires to the surfaces of different shape.
		Welding is performed in the automatic mode using a flash butt welding machine equipped with a turntable designed for 6 positions.
	paton.kiev.ua /eng/prop/0300.html (3080 words)

	Induction welding of thermoplastics (Knowledge Summary)
		Induction welding is similar to resistive implant welding, in that an electrically conducting implant is required at the joint line.
		For induction welding by eddy current generation, electric currents are induced in the implant and when these are sufficiently high to heat the conducting material, the surrounding thermoplastic parts melt or soften.
		Induction welding by eddy current heating is generally a geometry dependent technique because complete circuits are required to allow eddy currents to flow in the implant.
	www.twi.co.uk /j32k/getFile/ksfc005.html (942 words)

	Induction Welding (Site not responding. Last check: 2007-10-11)
		Induction heating is observed when conductive materials are subjected to a radio frequency (RF) field.
		Higher frequencies are required to heat the small metal or metal oxide particles that are mixed into most induction welding implants.
		The field is often applied to the workpieces by a coil made from copper tubing which is connected to the induction generator.
	www.ewi.org /technologies/plastics/induction.asp (219 words)

	Electric resistance welding at a glance
		A successful forged weld uses the optimum amount of heat, which is normally slightly less than the melting point of the material, and a nearly simultaneous application of circumferential pressure to the section, which forces the heated edges together (see Figure 1).
		In the case of HF induction welding, the weld current is transmitted to the material through a work coil in front of the weld point (see Figure 2).
		The types of weld pressure rolls, or squeeze boxes as they sometimes are called, that apply the pressure required for the weld are as varied as the welding units used to supply the heat.
	www.thefabricator.com /Articles/Tube_and_Pipe_Article.cfm?ID=89 (1470 words)

	Device for induction welding - Patent 4230923
		A device for induction welding apparatus fashioned partly from a metal plate is disclosed.
		A metallic device according to claim 1, or 2, or 3 wherein said metallic plate means is arranged for induction welding covers to container cases, by including two adjacent apertures formed in said conducting plate, each aperture having a contour corresponding to the external contours of said covers.
		This invention relates to devices for high frequency induction welding, and in particular to apparatus of this kind which is fluid cooled.
	www.freepatentsonline.com /4230923.html (1732 words)

	HÜTTINGER Electronic \| DC, MF and RF Generators for Plasma Excitation and Induction Heating
		Induction welding is suitable for welding transverse and longitudinal weld seams.
		In induction welding, the abutting edges are heated using high or medium frequencies — depending on the thickness of the wall — and then welded together while under pressure.
		Induction heating is ideally suited for continuous welding, such as welding longitudinal pipe seams.
	www.trumpf.com /scripts/huettinger/he_anwendung.php?lang=en&id=9&ianwendungid=2&artid= (244 words)

	Polyurethane Thin-Film Welding for Medical Device Applications (MDDI archive, Sep 02)
		Welding processes commonly used in assembling medical devices from thermoplastic films include RF welding, also known as dielectric sealing; ultrasonic welding; direct thermal sealing; induction welding or sealing, and solvent bonding (see Table I).
		RF welding, a form of dielectric heating, is one of the most widely used methods for assembling medical devices.
		In hot-tool welding, one or more electrically heated platens or bars are pressed against the surfaces of the films until they melt and bond together at the point of contact.
	devicelink.com /mddi/archive/02/09/004.html (2137 words)

	Feature Article - Laser Processing Meets Induction Heating - 07/97
		This led to the development of laser induction processes that are not only capable of hardening, but also performing cladding and welding in a manner heretofore impossible.
		According to Berndt Brenner, who heads the IWS Department of Material Science, the induction heating and the laser processing are arranged to work in a complementary manner, as the photon energy of the laser works primarily on the surface as the inductive energy works on the near-volume area of the materials being processed.
		Eckhard Beyer says laser induction processing can provide users with a variety of advantages, such as reliably hardening materials, the ability to weld components that are otherwise difficult to join, and the means to clad with high efficiency.
	www.autofieldguide.com /articles/079702.html (1312 words)

	Learn more about Electromagnetic induction in the online encyclopedia. (Site not responding. Last check: 2007-10-11)
		Electromagnetic induction is the production of an electrical potential difference (or voltage) across a conductor situated in a changing magnetic field.
		Michael Faraday was the first to describe this phenomenon mathematically: he found that the size of the voltage produced is proportional to the rate of change of the magnetic flux.
		Electromagnetic induction underlies the operation of generators, induction motors, and most other electrical machines.
	www.onlineencyclopedia.org /e/el/electromagnetic_induction.html (247 words)

	Stanelco Fibre Optics - nuclear waste disposal systems, plastic welding, optical fibre furnace manufactures (Site not responding. Last check: 2007-10-11)
		As the weld material is directly within the joint, the host material is not thermally stressed as with externally applied heat.
		The weld material is formulated to match the host material and includes a proportion of micron sized ferromagnetic particles within the compound.
		For instance a typical weld time for a jug kettle would be in the region of 8-15 seconds.
	www.stanelco.co.uk /InductionWelding.htm (519 words)

	Fabricating Custom Roll-Formed Welded Tube
		Even though welded tube produced from a custom roll-former's mill is made by a similar process, it is an entirely different product and should not be compared with tubes made in a high-speed mill.
		It is advantageous for the weld seam surface to arrive at the welder with a slight outward crown, allowing additional roll pressure to be applied across the part during welding.
		When induction welding, material is presented for welding when it passes through a coil that induces a current.
	www.sme.org /gmn/mag/2001/01myff46/01myff46.html (2233 words)

	VWvortex Forums: More Welding Questions!
		Welding with normal wire and no gas is a waste of time.
		Tell your welding supplier what your plans are and ask for recomendation about which gas and filler metal to use.
		Tungsten rods are $$ in addition to the welding equipment he'll need a bench grinder or belt sander with a fine grit abrasive that is used only for tungsten to avoid contamination of the tungsten and more importantly the work piece.
	forums.vwvortex.com /zerothread?id=460206 (2101 words)

	Photonics.com Printer Friendly View
		Measurements of single-lap shear strength revealed that the laser bond was stronger than one produced by resistive implant welding and significantly stronger than one produced by induction welding (Figure 2).
		In the case of resistive implant welding, the bond line similarly heated up directly and created a bond superior to that achieved with induction welding.
		This is attributable to the fact that the heating is too localized in the induction welding technique, a problem that is avoided when using the laser by scanning its wide beam over the surface of the repair patch.
	www.photonics.com /printerFriendly.aspx?contentID=65802 (1206 words)

	VWvortex Forums: MIG Welding Stainless?
		Welding is pretty big over here, but other trades represented by the U.S at that comp didn't get skwat.
		Oxyacetalene welding was the preffered choice for welding stainless, aluminum, magnesium and titanium for almost 50 years until GTAW welders became affordable and widespread.
		Oxyactrelene welding is all down to the choice of filler material used to join the two pieces, it is basically a less precise way to TIG weld.
	forums.vwvortex.com /zerothread?id=1013684 (3152 words)

	EFD (Site not responding. Last check: 2007-10-11)
		EFD are specialists in the induction heating and can offer a variety of applications for the tube and pipe industry.
		Longitudinal induction welding of steel, stainless steel and aluminum tubes.
		EFD can offer the most modern technology for induction welding and are easy to both retrofit into old production lines and fit into new production lines.
	www.efd-induction.com /html/industry/tube_pipe (88 words)

	TubeNet Directory of Tube and Pipe Industry
		A high frequency induction generator taps energy from the three-phase mains and transfers this, concentrating and amplifying it, to the contact point of the two edges of the pipe (welding V) in order to weld these together.
		The energy is transferred through magnetic induction according to which electric currents can be induced on the surface of a metal part immersed in a variable magnetic field.
		In the induction sector, this type of component is used extensively in the heat treatments of metal items (heating of mechanical parts and pipes) where the operating frequencies required do not exceed 150KHz and, in a number of rare cases, also to weld metal pipes.
	www.tubenet.org.uk /technical/emmeditech.html (2957 words)

	final
		Welding at a bond line requires the plastic to reach melt temperatures, which is accomplished in many ways.
		An alternative process is hot plate welding which uses a heating element to soften a bond area and mesh it with another softened part.
		Based on inducing heat within the joint, induction welding uses the magnetic properties of ferrous metals in conjunction with a thermoplastic compound to create a weld.
	www.stevens-tech.edu /engineering/me/Undergraduate/senior_design/2001/2001-5/final.htm (8228 words)

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