22results about How to "Low heat input" patented technology

This invention relates to transition layer materials and welding processes for welding dissimilar steel and aluminum materials, belonging to the field of welding technology. The transition layer material for welding dissimilar steel and aluminum materials of this invention comprises a copper layer, a copper alloy layer, and a zinc alloy layer arranged sequentially; the copper layer is adjacent to the steel base material, and the zinc alloy layer is adjacent to the aluminum base material; the copper content in the copper alloy layer is 62.0%-64.0%; the zinc content in the zinc alloy layer is 89.0%-91.0%; the mass ratio of the copper layer, copper alloy layer, and zinc alloy layer is (0.9-1.1):(2.3-2.7):(1.8-2.2). By sequentially setting the copper layer, copper alloy layer, and zinc alloy layer between the steel base material and the aluminum base material, a gradual transition from the steel base material to the aluminum base material is achieved, effectively avoiding the formation of brittle Fe-Al intermetallic compounds during direct welding, and enhancing the mechanical properties and durability of the welded joint.

The invention relates to an argon arc welding seam welding method for a lock bottom butt joint with a thermal barrier coating. The argon arc welding seam welding method comprises the following steps that S1, a welding seam joint is machined, specifically, a first groove is machined in a lock bottom at the mounting edge of the inner wall of a large bent pipe to be welded, a truncated edge is reserved, a second groove is machined in the mounting edge of the outer wall of the large bent pipe, and a truncated edge is reserved; the inner wall of the large elbow pipe and the outer wall of the large elbow pipe are combined, the lock bottom of the inner wall of the large elbow pipe is aligned with the mounting edge of the outer wall of the large elbow pipe, and the gap of the to-be-welded position is smaller than or equal to a first threshold value; s2, first-layer backing welding is carried out, during welding, welding wires are not filled, the truncated edge is directly penetrated in a penetration mode, and the step S3 is carried out after cooling; and S3, second-layer cosmetic welding is conducted, the first groove and the second groove are filled with welding wires, and then welding is conducted. According to the method, the welding quality can be guaranteed, heat input during welding can be obviously reduced, the coating is effectively prevented from falling off, and therefore the service life of the aero-engine large elbow is prolonged.

This invention relates to the field of metal surface strengthening technology, specifically a method for in-situ generation of TiC-TiN ceramic materials using a titanium-containing substrate and an atmosphere-assisted high-energy beam. This method utilizes the titanium-containing substrate itself as a titanium source. Under a specific atmosphere, high-energy beam irradiation causes the Ti element in the substrate to react in-situ with C and N elements in the atmosphere, generating a TiC and / or TiN ceramic strengthening layer on the substrate surface. Specifically, the method includes: pretreating the titanium-containing substrate; placing it in a reaction chamber and introducing an auxiliary gas containing C and / or N; scanning and irradiating the substrate surface with a high-energy beam, controlling process parameters to allow Ti to react with C and N, generating a 0.5-1.2 mm thick metallurgically bonded strengthening layer. The advantages are: this invention eliminates the need for additional titanium powder or carbon powder, resulting in a simple and low-cost process; the strengthened layer exhibits high bonding strength with the substrate with no risk of detachment; and it significantly improves the surface hardness, wear resistance, and corrosion resistance of the substrate, making it widely applicable in military, aerospace, and marine equipment fields.

This invention provides a coupled method for thermal cycling control and online cooling to maintain supersaturated solid solution. By integrating multiple online cooling devices and a closed-loop temperature control strategy, it achieves precise management of interlayer temperature, effectively suppressing premature precipitation of Y and O elements during the additive manufacturing process, maintaining a high degree of supersaturation in the matrix, and providing a favorable condition for the formation of ultrafine nano-precipitates in subsequent heat treatment. Simultaneously, the linkage between interlayer temperature window control and process parameter adjustment ensures that each layer experiences a similar thermal history, significantly improving the microstructure consistency along the height direction of the component and eliminating performance gradient differences present in traditional processes. The introduction of a periodic thermal cycling management strategy further releases thermal stress, homogenizes the temperature field, and prevents precipitation coarsening through rapid cooling, thereby improving the overall mechanical properties of the material. This invention provides an efficient, controllable, and reliable process solution for the additive manufacturing of high-performance ODS-RAFM steel.

This invention discloses a heat treatment method and apparatus for engine housings. The method includes: performing a temperature test on a welded test ring; clamping the engine housing to be treated onto a transmission support mechanism and adjusting the relative position of the engine housing and the induction coil to ensure that the axis of the engine housing is coaxial with the axis of the induction coil; positioning the circumferential weld to the heating center region of the induction coil; controlling the transmission support mechanism to rotate the engine housing around its own axis and performing local induction tempering treatment on the circumferential weld through the induction coil; after the current circumferential weld has completed local induction tempering treatment, adjusting its position along the axial direction of the engine housing to allow the next circumferential weld to enter the heating center region, and repeating the local induction tempering treatment until each circumferential weld has completed local induction tempering treatment, thereby solving the problem of poor process compatibility between the heat treatment method and the process of thin-walled housings with large aspect ratio in the prior art.

This invention relates to an electron beam welding method for ZL114A / ZL270 dissimilar aluminum alloy materials, belonging to the field of electron beam welding technology. It addresses one of the problems encountered in existing electron beam welding methods for ZL114A / ZL270, namely, the presence of obvious cracks, incomplete fusion, and excessive internal porosity within the weld seam. The electron beam welding method of this invention includes: tack welding of assembled ZL114A and ZL270 alloy test plates; welding using a dual electron beam synchronous welding method with one electron beam preheating the weld seam first, followed by the other electron beam for the final welding; during the final welding process, the center of the electron beam spot is shifted from the butt joint of the test plates towards the ZL270 alloy plate side.

This invention discloses a manual argon arc welding method for sealing welds of containers with metal gaskets, aiming to solve the problems of multiple filler layers, poor welding quality, and slow speed in existing technologies. The method includes butt welding of base materials, attaching a metal gasket to the base material, with a bottom gap of 1-2 mm formed by the butt welding; using tungsten inert gas (TIG) welding to weld the base material and metal gasket together in one pass at both included angles to form the weld seam. During welding, the welding torch current is 180-220 A, the arc length is controlled within 2 mm, the welding speed is 20-22 cm / min, and two weld layers are formed. This invention is suitable for welding butt welds of sealed containers with metal gaskets, achieving the effects of fewer weld layers, high welding quality, and high speed.

The present application relates to a fish scale welding method and welding machine, belong to fish scale welding technical field, the method includes a plurality of welding cycle, each cycle includes pulse stage and arc breaking stage, the arc breaking stage includes: in response to the last pulse of pulse stage end, the positive wire feeding makes the welding wire into the molten pool; after the welding wire into the molten pool, continue positive wire feeding and continue for the first time; the first time after stopping wire feeding, so that the welding wire stays and keeps contact with the molten pool; the welding wire stays for the second time; the second time after reverse wire drawing makes the welding wire leave the molten pool to carry out the next welding cycle.The present application guarantees the stability of the molten pool through the process of welding wire into the molten pool and keeping, avoids the shock to make the fish scale surface without fine texture; at the same time, the welding wire can also play the role of heat dissipation to the molten pool, to reduce the purpose of heat input. Overall, the fish scale welding is more clear and beautiful, and the welding heat is lower, which is suitable for high appearance requirement welding occasion.

The invention discloses a laser precision cutting and heat affected zone control method and system for a phosphoric acid fuel cell electrode. The method comprises the steps that an original image of the electrode is obtained, an actual alignment mark is recognized, sub-pixel-level centroid coordinates are calculated through geometric moments, coordinate mapping is conducted on a standard cutting path in combination with a two-dimensional affine transformation model, and a corrected cutting path is generated; in the cutting process, a microscopic image of a laser action area is collected in real time, and a thermal damage index is calculated based on the width of a kerf heat affected zone and an edge carbonization mean value; and the control module dynamically adjusts the cooling wind speed through a PID algorithm according to the deviation between the thermal damage index and a preset threshold value, and triggers a secondary suppression strategy for reducing the laser energy when the wind speed reaches the limit. According to the method, path deviation is solved through visual positioning compensation, cooling and laser parameters are cooperatively adjusted through visual thermal field feedback, and the heat accumulation and carbonization phenomena in phosphoric acid fuel cell electrode machining are effectively restrained.

The application discloses an aluminum alloy box unequal-thickness butt joint friction stir welding method, which comprises the following steps: process placing of an upper panel of an aluminum alloy box, increasing a friction stir welding arc receiving plate area; cleaning the left panel, the right panel and the upper panel of the aluminum alloy box, adopting mechanical polishing and cleaning; positioning and assembling the left panel, the right panel and the upper panel on a tool, controlling the assembly gap and the misalignment to be not greater than 0.5 mm; setting the parameters of the friction stir welding, and welding the weld joints between the left panel and the upper panel and between the right panel and the upper panel. The aluminum alloy box unequal-thickness butt joint friction stir welding method utilizes the advantages of the friction stir welding to improve the welding deformation, improves the welding quality and improves the production efficiency.

The present application relates to a kind of low-pressure laser welding method applied to microstructure small diameter closed weld, comprising: fuel medium transmission part is assembled with oxidant medium transmission part, and laser welding dot positioning and fixed after;Laser probe is selected coordinate point along weld circumference, and weld path is fitted by interpolation calculation method, laser emitter is operated, so that laser point movement path coincides with weld, and working path is determined;Laser emitter rotates to starting point of arc with varying process parameters along the starting point of arc, and closed weld welding is completed, during weld welding process: based on the penetration of product, laser power and working distance are set, power P=300×Hd, starting point of arc working distance, i.e. H1 It is Δ0±0.2mm, and the working distance H2 of arc position is Δ0+5mm.The present application solves the problem that traditional laser welding cannot guarantee the penetration of microstructure small diameter closed weld and the smaller welding deformation amount.

This invention provides a composite pulse short-circuit oscillation method and apparatus for MIG welding of aluminum alloys, relating to the field of aluminum alloy welding technology. This composite pulse short-circuit oscillation method is used for large-gap vertical welding between aluminum alloy die-castings and profiles. It includes multiple consecutive welding cycles, with a large gap of 0.5mm to 1.8mm. The welding torch push angle is 0°, and the welding torch oscillates reciprocally along the weld direction. Each welding cycle includes alternating forward oscillation and backward oscillation phases, with the oscillation center point of the welding torch as the boundary. During the forward oscillation phase, the welding wire is fed in the forward direction, including alternating pulse and short-circuit phases.

A housing includes a shell, three sheet metal parts, a long rib, a short rib, and two sheet metal parts. The shell contains annularly distributed inner support blocks. An upper flange is located at the top of the shell, a lower flange at the bottom, and a middle flange is located between the upper and lower flanges on the inner wall of the shell. Two sheet metal parts are located between the lower flange and the side wall of the shell. The sides of the two sheet metal parts are connected to the side of the middle flange by an arc-shaped connecting plate. An upper horizontal circumferential seam exists at the connection between the connecting plate and the middle flange, and a lower horizontal circumferential seam exists at the connection between the connecting plate and the two sheet metal parts. Gaps exist at both the upper and lower ends of the side wall of the shell, filled with insulating cotton sealing plates. A layer of insulating cotton is also provided on the inner wall of the shell. This design reduces the depth of the arc crater, effectively avoiding arc crater crack defects, simplifies the manufacturing of structural components, and significantly improves the welding quality of the wall panels and the housing.

The application provides a preparation method of a cladding alloy layer on a concave-convex spherical surface matching surface and a support. The cladding alloy layer is formed by high-speed laser cladding on the concave-convex spherical surface matching surface to replace traditional stainless steel spherical surface cladding, so that the phenomenon of non-adhesion and cavity of stainless steel and a base material can be avoided. The preparation steps of the cladding alloy layer comprise the following steps: laser cladding of alloy powder on a matching surface on which the cladding alloy layer needs to be formed by a high-speed laser cladding device, so as to form the cladding alloy layer on the matching surface; then polishing the cladding alloy layer; during the laser cladding process, the flow rate of protective gas is controlled to be 2-20 L / min, the flow rate of powder feeding gas of the alloy powder is controlled to be 1-3 L / min, the power of laser is controlled to gradually increase from 20% to 90%, the powder feeding amount of the alloy powder is controlled to gradually increase from 1.5 g / min to 75 g / min; and the cladding height is controlled to be 15-25 mm.

This invention relates to a composite self-lubricating coating for low- and medium-carbon steel materials and its preparation method. The coating comprises a wear-resistant deposited layer on the surface of the low- and medium-carbon steel material and a self-lubricating layer sprayed onto the surface of the deposited layer. The wear-resistant deposited layer is a tungsten carbide deposited layer, and the self-lubricating layer is a molybdenum disulfide self-lubricating layer. A scaly tungsten carbide deposited layer is formed on the surface of the low- and medium-carbon steel material using electrical discharge deposition (EDD) technology. Then, molybdenum disulfide is sprayed onto the tungsten carbide deposited layer using a spraying technique to form the self-lubricating layer. After baking and cooling, the composite self-lubricating layer is formed. The combination of tungsten carbide and molybdenum disulfide significantly improves the wear resistance and hardness of the material, especially in applications under abrasive wear environments, effectively extending the service life of the workpiece. Furthermore, the process provided by this invention is simple, easy to operate, has low equipment costs, and is easily achievable for large-scale mass production.

The application discloses a magnetic separator medium box welding device and process method, and belongs to the technical field of magnetic separator medium box welding. The device comprises a control unit of whole machine control, a rack, a laser welding module and a top surface fluctuation acquisition unit. The control unit is internally provided with a data entry module, a motion path control module, a path compensation calculation module, a path calculation module and a laser welding control module. A Y-direction transposition electric sliding table is fixedly arranged in the middle of the top surface of the rack. A medium box bearing platform is fixedly arranged on the sliding block of the Y-direction transposition electric sliding table. The magnetic separator medium box welding device and process method adopt a double symmetrical welding sequence, so that the deformation stress in the Z-axis and Y-axis directions is offset, the welding deformation is greatly reduced from the source, the overall sinking amount of the medium box is measured in real time through a displacement monitoring unit, high-precision full-closed-loop compensation is realized, and the automatic welding of the medium box to be welded is high in efficiency and high in quality.

The application discloses a kind of cold-rolled roller chrome plating layer defect repair devices, it is related to metal rolling equipment technical field.The device includes workbench, first supporting roll, load roll, second supporting roll, cold-rolled roller, repair device and shroud;Repair device includes support, recess, driving motor, screw rod, slot block and composite repair execution mechanism.Support is fixed to the side of cold-rolled roller, and composite repair execution mechanism can be moved radially by driving motor.Three load-bearing structures that can move synchronously in axial direction are integrated in composite repair execution mechanism, respectively carrying online detection module, laser cleaning head and cold spraying deposition head, and loading assembly that can automatically adjust angle is arranged on each load-bearing structure.It is close to cold-rolled roller when repairing, scanning and identifying defects, and driving laser cleaning head and cold spraying deposition head to clean and deposit repair defects in turn.The application realizes the online, automatic repair of cold-rolled roller, shortens maintenance time, and guarantees the continuity of rolling production.

This invention discloses a support manufacturing method for rapid removal of parts manufactured using arc additive manufacturing (AED), applicable to solid structures formed by AED. A support structure is constructed between the part to be processed and the substrate using AED. The support structure consists of multiple arrayed short pillars, which are formed by layer-by-layer deposition of molten droplets of AED onto the substrate. The upper surface of the support structure serves as the receiving surface for the part to be processed. The support structure manufacturing method of this invention only requires layer-by-layer deposition of molten droplets on the substrate surface before processing. The process is easy to implement and its feasibility has been proven through practical application. During the manufacturing process, due to its low wire feed speed, low heat input, and weak bond between the support structure and the substrate, the part with the support structure can be easily and quickly removed from the substrate completely.

The application discloses a kind of laser electric arc welding device and method of aluminium alloy medium plate narrow gap, the gap reserved between base material is big blunt edge small groove angle form, TIG welding gun one is arranged in sequence along welding direction above base material, MIG / MAG welding gun, laser beam two, welding wire, laser beam one, shielding gas nozzle.In the back of base material along the welding direction, TIG welding gun two, ultrasonic amplitude rod, TIG welding gun three are arranged in sequence.TIG arc between upper and lower TIG welding gun can preheat / melt the base material of butt joint gap, it is favorable to the wet spreading nature of welding wire after melting of MIG / MAG welding gun enters butt joint gap.Special fixture is used to connect TIG welding gun one, MIG / MAG welding gun, laser beam two, welding wire, laser beam one, shielding gas nozzle, then synchronous swing device is connected with this fixture.It can realize to improve laser energy utilization and welding efficiency, reduce porosity, incomplete fusion, undercut and other welding defects, improve weld structure and mechanical properties.

The present application relates to a kind of high finish polishing process of aluminum material, belong to bathroom product semi-finished aluminum part polishing technical field, by introducing constant temperature constraint and subarea correlation parameter in fine polishing stage, the thermal state of polishing contact area is directly controlled, on the one hand, the polishing agent is preheated and kept warm at 120 DEG C±2 DEG C, and continuously supplied to polishing wheel in fine polishing process, so that polishing contact area continuously obtains temperature stable lubrication or heat exchange medium, from source, weaken the random fluctuation of friction heat generation, on the other hand, the surface to be polished of complex aluminum part is divided into three zones according to geometric edge and surface transition degree, and the gradient relationship of linear velocity, contact pressure and polishing agent supply amount is configured respectively, so that the edge corner orifice area prone to stress concentration and instantaneous overheating is matched with higher supply amount at lower speed and lower pressure to obtain stronger lubrication and thermal stability, reduce the defects such as adhesion, drag mark, fogging and uneven gloss caused by local overheating, improve appearance consistency and reduce rework rate.

The invention provides a thick-plate narrow-gap titanium alloy double-sided swing laser powder feeding additive process method, which is used for completing high-quality joint of titanium alloy plates with the thickness of 50mm and thicker and eliminating the defects of incomplete fusion, air holes, cracks, oxidation and the like. Welding deformation is reduced, the process stability is improved, and the problems of low efficiency and welding material waste caused by multi-layer and multi-pass traditional surfacing are solved; the heat input and the production cost are reduced, the production period is shortened, and meanwhile it is guaranteed that the mechanical property of a jointed structural part is superior to that of base metal. Through the integrated design of special device customization, accurate parameter matching and double-face symmetrical material adding, the design of a special symmetrical inverted trapezoidal groove, the design of an extensible red copper powder feeding pipe, the design of an extensible material adding protection cover and sectional type accurate process parameter matching are adopted.