1262 results about "Dissimilar metal" patented technology

A thermocouple having a support tube configured to receive a pair of wires of dissimilar metals. The pair of wires of the thermocouple connected at a junction adjacent to one end of the support tube. The thermocouple further including a cap attached to the opposing end of the support tube, wherein the cap receives the free ends of the pair of wires. The cap allowing the pair of wires to translate freely therethrough to accommodate the difference in thermal expansion and contraction of the pair of wires relative to the thermal expansion and contraction of the support tube.

A thermocouple for use in a semiconductor processing reactor is described. The thermocouple includes a sheath having a measuring tip at one end and an opening at the other end. A support member having bores formed along the length is disposed within the sheath. A pair of wires formed of dissimilar metals are disposed within the bores, and one end of the wires is fused together to form a junction. The wires extend along the length of the bores. As the wires exit the bore, they are spatially or physically separated to prevent a short circuit therebetween. The ends of the wires exiting the bore are also free to thermally expand in the longitudinal manner, thereby reducing or eliminating the potential for the wires to fail due to grain slip.

A method and apparatus for embedding features and controlling material composition in a three-dimensional structure (130) is disclosed. The invention enables the control of material characteristics, within a structure (130) made from a plurality of materials, directly from computer renderings of solid models of the components. The method uses stereolithography and solid model computer file formats to control a multi-axis head (480) in a directed material deposition process (123). Material feedstock (126, 127) is deposited onto a pre-heated substrate (19). Depositions (15) in a layer-by-layer pattern, defined by solid models (141, 146), create a three-dimensional article having complex geometric details. Thermal management of finished solid articles (250-302), not available through conventional processing techniques, is enabled by embedded voids (152) and/or composite materials (126, 127), which include dissimilar metals (210, 216). Finished articles control pressure drop and produce uniform coolant flow and pressure characteristics. High-efficiency heat transfer is engineered within a solid structure by incorporating other solid materials with diverse indexes. Embedding multi-material structures (132, 134) within a normally solid component (141) produces articles with diverse mechanical properties. Laser and powder delivery systems (420, 170) are integrated in a multi-axis deposition head (480) having a focused particle beam (502) to reduce material waste.

A drum washing machine and a clothes dryer equipped with a thermoelectric module are disclosed. The thermoelectric module includes a heat absorption side and a heat dissipation side which absorbs and dissipates heat at a junction between two dissimilar metals depending on direction of current flow through the junction. The heat absorption side is disposed at a hot air flowing passage. Accordingly, the drying apparatus can increase energy efficiency with minor structural modification and becomes environmentally friendly unlike a conventional drying apparatus using a heat pump.

Novel orthopaedic bone screws/spinal pedicle screws and implants that include coatings to help promote a structurally stable interface between the implant and the patient's bone/tissue, and methods of coating such screws and implants are provided. The implants and methodologies described involve at least a coating that facilitates osseous integration, and additionally at least one coating that either reduces the risk of infection in immunologically suppressed patients and/or for utilization in patients who have infection, but who require stabilization, or coatings that permit the use of dissimilar metals and prevent galvanic corrosive reactions.

There is provided method for joining dissimilar metals of a steel product and a light metal product with each other, wherein the light metal product and a rivet made of an iron-base metal are connected with each other beforehand in a previous process preceding spot welding, and subsequently, the rivet and the steel product are spot welded with each other. Then, a cavity for use in clinching the light metal product is formed, and upon the stem of the rivet is embedded into the light metal product to penetrate therethrough, light metal is caused to undergo plastic flow into the cavity of the rivet, for clinching the light metal product to be thereby clinched with the rivet whereupon spot welding for forming a weld nugget only within the scope of an interface between the stem of the rivet, and the steel product is carried out. Thus, the present invention can implement the spot welding between iron—iron similar metals, without a constraint on, and a problem with conditions applicable to the spot welding and a high joint strength can be obtained owing to the synergistic effect of the spot welding and connection by clinching of the aluminum alloy product with the iron-base rivet, added thereto.

An ultrasonic method and apparatus utilizing phased array technology for obtaining accurate crack height measurements in materials where crystallographic structure creates beam reduction effects.

When a friction stir weld tool penetrates the interface of two workpieces of dissimilar metal alloy materials, the resultant weld of the different alloy materials may produce a weak weld joint. Such weak joints are often experienced, for example, when attempting to form spot welds or other friction stir welds between a magnesium alloy sheet or strip and an aluminum alloy sheet or strip. It is discovered that suitable coating compositions placed at the interface of assembled workpieces can alter the composition of the friction stir weld material and strengthen the resulting bond. In the example of friction stir welds between magnesium alloy and aluminum alloy workpieces, it is found that combinations of copper, tin, and zinc, and other powders can strengthen the magnesium-containing and aluminum-containing friction stir weld material.

A leak detection apparatus includes one or more detection devices that envelope the various pipe joints of a liquid circulation cooling system. In one approach, the detection devices include a pair of conductors separated by a wicking material impregnated with a crystalline salt that provides a low resistance electrical path between the conductors in the presence of a leak. In another approach, the detection devices include a pair of dissimilar metal mesh electrodes separated by an electrolyte-impregnated wicking material to form a water-activated battery that energizes an alarm in the presence of a leak. In either case, the electrodes and wicking material may be encased with a water-activated sealing material that hardens in the presence of a leak to contain the leakage.

Described is a Schottky diode using semi-conducting single-walled nanotubes (s-SWNTs) with titanium Schottky and platinum Ohmic contacts for high-frequency applications. The diodes are fabricated using angled evaporation of dissimilar metal contacts over an s-SWNT. The devices demonstrate rectifying behavior with large reverse-bias breakdown voltages of greater than −15 V. In order to decrease the series resistance, multiple SWNTs are grown in parallel in a single device, and the metallic tubes are burnt-out selectively. At low biases, these diodes showed ideality factors in the range of 1.5 to 1.9. Modeling of these diodes as direct detectors at room temperature at 2.5 terahertz (THz) frequency indicates noise equivalent powers (NEP) comparable to that of the state-of-the-art gallium arsenide sold-state Schottky diodes, in the range of 10-13 W/square-root (√) Hz.

A hermetically sealed connector comprises an outer metallic shell having an aperture that receives a multipin-retaining, multi-metallic insert. The insert is a laminate of dissimilar metals, including a first metal extending to a first side of the insert and having a first coefficient of thermal expansion (CTE), and a second metal extending to a second side of the insert and having a second CTE different that the first CTE. A plurality of bores extend between first and second sides of the insert and contain connector pins that are hermetically sealed with the first metal of the insert by a dielectric material formed between the pins and sidewalls of the bores. A bond joint is formed between the second metal of the insert and the side of the outer metallic shell adjacent to the second side of the metallic insert.

The invention relates to a method for connecting an aluminum alloy and steel by a laser filler wire, which is suitable for the field of dissimilar material connection and particularly suitable for the connection between dissimilar materials of which fusion points and thermal physical properties differ from each other greatly. The method comprises the following steps of: assembling a lap joint in which an aluminum plate is arranged on a steel plate, wherein a laser beam, a wire feeding nozzle and a protective gas nozzle are fixed in the same plane, the laser beam is vertically incident, and a laser focus, a wire dropping point of a welding wire and a protective gas feeding point are guaranteed to be consistent during welding; and melting the fed aluminum welding wire by using the laser to ensure that the molten aluminum welding wire is in fusion connection with the aluminum plate, simultaneously a micro fusion layer is formed on one side of the steel plate and then a fusion-braze welding connection is formed, thus the lap joint between dissimilar metals such as the aluminum alloy and the steel is realized. The method improves the connection efficiency between the dissimilar metals such as the aluminum alloy and the steel, and the tensile strength of the joint is over 149.6N/mm. The method solves the problems of long preparation time, low automation degree and poor reproducibility of welding results in the process of connecting pre-coated layers of the dissimilar materials such as welded-aluminum and the steel.

The invention provides a dissimilar metal spot welding system of light metal and coated steel and a welding method thereof, wherein the system comprises a CMT (cold metal transfer) arc welding system, an air bottle, a robot control module, a robot and a clamping device; the arc welding system is connected to the robot control module and used for transmitting a welding control signal; the air bottle is communicated with the CMT arc welding system; the robot control module is connected to the robot for transmitting a control signal of the movement of the robot. In the invention, a spot melting soldering joint is formed between light metal and coated steel to realize the spot connection of the light metal and the coated steel; the serious deformation of the joint during continuous seam welding is solved while the connecting quality of dissimilar metal is ensured; traditional vehicle body part joints primarily using resistance spot welding process are not influenced; and the design and manufacture costs of vehicle bodies are greatly reduced.

The invention provides a cold metal transfer connection method of aluminum/steel dissimilar metal. The cold metal transfer connection method comprises the following steps of: utilizing an aluminum alloy welding wire containing aluminum and silicon elements to weld; through carrying out cold metal transfer welding, forming a melt welding connection at one side of an aluminum plate through melting the aluminum alloy welding wire and an aluminum alloy parent metal in the welding process; and meanwhile, keeping a steel plate at a solid state and realizing a braze welding connection at one side of the steel plate, so as to form a melt-braze welding overlap joint.

The invention provides an ultrasonic welding method of Al/Ti dissimilar metal TIG electrical arc micro-melting brazing and following welding, wherein an isochronous and stable ultrasonic vibration system is added in the TIG micro-melting brazing process, and the simultaneous and equi-directional welding of TIG micro-melting brazing and following welding is realized through a spherical interlinking device. The method comprises the following steps of: enabling a welding gun tungsten electrode and a test piece to reach reasonable welding height by vertically adjusting the position of a welding gun; enabling a continuous vibration ball to cling to the surface of the test piece by vertically adjusting an ultrasonic transmitting device; measuring the distance d from the contact point of the continuous vibration ball and the surface of the test piece to a TIG welding gun tungsten electrode by horizontally adjusting an ultrasonic generating device to enable d to satisfy welding requirements; and reasonably matching an ultrasonic vibration device and a TIG welding gun by adjusting d, and adjusting the acting position of ultrasonic vibration by adjusting d. The invention has strong process applicability and good stability, realizes the semi-automatic welding of Al/Ti dissimilar metal connection, and has wider usability and good improving action for the welding joints of TIG micro-melting brazing for various dissimilar metals.

The invention provides a preparation method for a multilayer dissimilar metal composite ultra-thin strip. The preparation method includes the process steps that (1) different metal materials are synchronously cold-rolled for first thinning; (2) metal thin strips are polished and cleaned; (3) the upper surfaces and lower surfaces of two or more metal thin strips are closely attached; (4) two-roll synchronous cold rolling is conducted on dissimilar metal combined strips; (5) the upper surfaces and lower surfaces of 2-10 dissimilar metal thin strips subjected to preliminary combination are closely attached and then the procedures of the step (1) to the step (4) are repeated 2-10 times; (6) reversible four-roll synchronous cold rolling is conducted on a multilayer dissimilar metal composite thin strip; and (7) reversible four-roll asynchronous cold rolling is conducted on the multilayer dissimilar metal composite thin strip, and the multilayer dissimilar metal composite ultra-thin strip with the thickness being 0.01 mm-0.02 mm is obtained. According to the method, the selection range of the metal materials is wide, the requirement for equipment capacity is low, and the surface quality of the ultra-thin strip can be improved remarkably; besides, production resources are saved, production cost is reduced, and the method is suitable for large-scale industrial production.

A method of bonding dissimilar metals, a bonding structure formed by such a method and a bonding apparatus for performing such a method. The resulting bond is capable of preventing corrosion (e.g., electric corrosion) resulting from contact of the dissimilar metals and obtains a dissimilar material joint exhibiting anti-corrosive property and bonding strength at low costs. The method includes overlapping two materials made from dissimilar metals having a seal material interposed therebetween and discharging the seal material from a bonding interface and bonding the two materials in direct contact with each other.