75 results about "Cold welding" patented technology

This invention discloses a grinding device for metal powder processing, relating to the field of metal additive manufacturing powder technology. It includes a collection box with a controller fixedly installed on one side of its outer wall. A grinding cylinder is fixedly connected through the top of the collection box. The inner wall of the grinding cylinder is made of silicon carbide ceramic, and a grinding mechanism is installed inside the grinding cylinder. A spiral feeding mechanism, a gear transmission mechanism, and a cooling mechanism are sequentially arranged outside the grinding cylinder. This invention uses multiple surface-mount temperature sensors to monitor the temperature of different areas of the grinding cylinder in real time. When the temperature rises, a circulating pump starts, and cooling water circulates within a hollow cooling ring, carrying away the grinding heat. Furthermore, a water temperature control component actively cools and stirs the cooling water to ensure a continuously low temperature. This closed-loop temperature control system effectively controls the temperature of the grinding zone, effectively preventing oxidation, phase transformation, or cold welding of the metal powder, thus ensuring the production and forming effect of the metal additive powder.

The application provides a kind of hot vacuum equipment cable storage device, including fixing device, connecting device and storage hook;The fixing device includes first clamping plate and second clamping plate;The connecting device includes ball head mounting seat, ball head clamp seat, ball head adjusting rod;The ball head mounting seat is fixedly arranged on the first clamping plate or second clamping plate;The ball head clamp seat is rotatably connected with the ball head mounting seat;The ball head adjusting rod is connected with the ball head clamp seat at one end, and is connected with the storage hook at the other end.Solve the current hot vacuum environment scene, using ordinary nylon cable ties, metal clamp or plastic wire clamp, resulting in material outgassing pollution optical lens or sensitive device, cold welding and jamming, high and low temperature cycle causes material expansion and contraction, resulting in cable is not firm and angle adjustment difficult, difficult to adapt to complex wiring path;Storage is inconvenient, cable disassembly lacks temporary fixing point, easy to scatter or damaged and other technical problems to be improved.

This utility model relates to the field of copper wire cold welding technology and discloses a multi-directional synchronous pressure device for a copper wire cold welding machine, a welding platform, a welding support arm fixedly installed on one side of the top of the welding platform, and a limiting mechanism provided inside the welding platform; the limiting mechanism includes a sliding bracket, which is slidably connected inside the welding platform, and a hydraulic rod is fixedly installed on one side of the outer wall of the sliding bracket. This utility model, through the design of a moving plate, a fixed frame, a support shaft, a connecting block, a pressure plate, and a limiting ring, achieves a synchronous pressure clamping effect on the copper wire in multiple directions, avoiding rotation or shaking under force, which would affect the accuracy and quality of welding and cause misalignment. At the same time, it can adjust the displacement of the moving plate according to the diameter of the copper wire, so that the pressure plate rotates, which is suitable for pressure fixing copper wires of different diameters, further improving applicability.

This utility model relates to the field of cold welding machine technology, specifically a three-station bimetallic cold forging composite contact automatic welding machine. It mainly includes a support frame, with a protective shell at the top. Feeding components are connected to the left and right sides of the front end of the protective shell. A bottom mold and a wire inlet mold are located at the front of the protective shell, and cutting components are located on both the left and right sides of the front end. A linkage turntable is located on the left rear end of the protective shell, and a transmission gear set is located on the right side of the protective shell. This three-station bimetallic cold forging composite contact automatic welding machine, through the cooperation of a rotation adjustment component, an intermittent lifting component, a moving support component, and a stamping station component, processes the product at multiple stations, resulting in a uniform silver layer distribution and stronger bonding strength. The processing is monitored by an imaging device, and the machine automatically stops immediately upon detecting material shortage, material depletion, overlapping of products, or broken needles, thus preventing further losses.

The present application relates to the technical field of aluminum alloy, and particularly provides a heat treatment free 6N01 aluminum alloy, a preparation method and application thereof, the 6N01 aluminum alloy is an extruded profile obtained by compacting, sintering, extruding and aging treatment of composite powder cold welding particles; the composite powder cold welding particles are obtained by ball milling of composite powder composed of aluminum powder and carbon nanotube and Mg and Si, and the aging treatment refers to transient aging precipitation during the natural cooling process after alloy phase extrusion; wherein, the content of Mg in the composite powder cold welding particles is 0.5-0.7wt%, the content of Si is 0.6-0.7wt%, the content of carbon nanotube is 0.5-1.2vol%, and the content of trace alloying elements is not higher than 0.5wt%. For the 6N01 aluminum alloy long profile with a single length of 26-30 meters for high iron, the present application can greatly shorten the delivery cycle and reduce the cost, and has good practical engineering significance and economic value.

The application discloses a preheating device for glass material circuit board welding and belongs to the technical field of circuit board processing and welding. The preheating device for glass material circuit board welding comprises a workbench and further comprises a rotary table rotatably arranged on the workbench, a motor one fixedly connected to the top of the workbench and used for driving the rotary table to rotate, wherein a preheating bin is formed in the top of the workbench, a first heating wire is fixedly arranged in the preheating bin, and a heat conduction plate is slidably arranged in the preheating bin; a storage rack for placing the circuit board is slidably arranged on the rotary table, a driving part for driving the storage rack to slide is arranged on the rotary table, and the storage rack is matched with the heat conduction plate; the preheating bin is arranged in the welding process to preheat the circuit board, sudden high-temperature bearing of the circuit board can be prevented, thermal expansion and cold contraction are intensified, welding defects such as false welding, cold welding and empty welding are generated at the welding points, the product quality is affected, and the production cost is increased.

The invention provides flaky zinc powder suitable for a water-based zinc-rich coating and a preparation method of the flaky zinc powder, and the preparation method comprises the following steps: preparing spherical fine zinc powder of which the particle size is less than or equal to 74 microns; mixing the spherical fine zinc powder, an auxiliary agent A and an auxiliary agent B, putting the mixture into a roller ball mill, and performing ball milling in a protective gas atmosphere to obtain flaky powder; the sum of the mass of the assistant A and the assistant B is 1-3% of the mass of the spherical fine zinc powder; in a protective gas atmosphere, continuously polishing and shaping the flaky powder obtained in the step S2 in the roller ball mill, and discharging; the rotating speed of the roller ball mill in the step is not greater than that of the ball mill in the step S2. According to the technical scheme, the obtained flaky zinc powder is good in powder flowability and dispersity and less in cold welding, and a prepared coating is easy to disperse and not prone to precipitation; the powder is good in flaking and smooth in surface, and the product is not oxidized and does not generate heat even if being completely exposed in the air.

The application discloses a method of liquid cold welding (LCW) including: (a) engaging two or more porous conductive substrate layers between perforated non-conductive frames so that the substrate layers contact one another; (b) immersing the substrate layers in an electrolyte solution; and (c) applying electric current and / or voltage and / or electric power to the electrolyte solution. Apparatus suitable for performance of some embodiments of the method are also disclosed.

The application relates to the field of welding equipment, in particular to a full-automatic spot welding machine for magnetic head production. The full-automatic spot welding machine comprises a conveying frame, a fixing frame and a first electric push rod, etc.; the fixing frame is fixedly connected to the conveying frame; and the first electric push rod is fixedly connected to the fixing frame. The application realizes that the sliding plate is driven by the second electric push rod to move to the side close to the welding head, the vertical part is in contact with the magnetic head, the conductive block is in contact with the welding head, the electrode plate is in contact with the magnetic head, after the external power supply is started, the current is not only transmitted to the upper surface of the magnetic head through the welding head, but also transmitted to the electrode plate through the conductive block, and then transmitted to the left side surface and the right side surface of the magnetic head, so that the current is transmitted through multiple current paths, the current transmission is more stable, the problem that the welding head only forms a single contact surface with the upper surface of the magnetic head, the effective current actually acting on the welding surface is reduced, the current density of the local area of the welding surface is insufficient, and the risks of false welding and cold welding are increased is solved.

The invention relates to the technical field of metal material welding, in particular to a low-deformation high-fatigue-performance welding method for a high-strength 6-series thin-wall aluminum alloy, which comprises the following steps: S1, precision pretreatment before welding: carrying out surface cleaning and weldability protection on a groove and an adjacent area of a to-be-welded workpiece; s2, low-heat-damage double-source collaborative welding is conducted, specifically, welding is conducted through double-wire pulse consumable electrode inert gas shielded welding, and welding-following local chilling is conducted on the back face of a welding seam in the welding process; and S3, after-welding active performance regulation and control treatment is conducted, specifically, high-frequency mechanical shock treatment is conducted on the weld toe area of the weld joint cooled to the room temperature, and then local solid solution and aging composite heat treatment is conducted on the area containing the weld joint and the heat affected zone. According to the method, the welding stability is guaranteed through pretreatment, the total heat input is reduced through double-wire welding, a high-temperature area is shrunk along with welding chilling, cooperative control over welding deformation and residual stress is achieved, pressure stress is introduced through weld toe impact, a softening area is repaired through local heat treatment, and the fatigue performance of a connector is improved.

The present application relates to the technical field of remanufacturing, in particular to a beryllium bronze piston part inner wall damage repairing method, and its specific steps are as follows: S1, defect inspection; S2, electrode rod preparation; S3, electric spark coating repair; S4, cold welding machine remelting; S5, heat treatment; S6, inner hole honing; S7, repair verification; The present application adopts the method of electric spark coating repair + cold welding composite repair, which not only solves the problem of electric spark coating repair layer being not dense, but also solves the problem of difficult wire feeding in the cold welding inner hole repair process, and the specially-made electrode rod solves the problem of shaking of the long electrode rod rotating at high speed in the electric spark coating repair process, the metallographic of the repair layer does not have cracks and un-melted defects, the repair layer is metallurgically combined with the matrix, and the hardness of the repair layer reaches more than 90% of the matrix.

The application relates to the technical field of aluminum nitride powder preparation, and particularly discloses an aluminum nitride powder preparation device and a preparation process thereof, which comprises a bottom plate, two mounting racks are fixedly installed on the top surface of the bottom plate, a rotating frame is rotatably installed between the two mounting racks through a rotating shaft, two opposite inner walls in the rotating frame are both rotatably installed with mounting shafts, and the ends of the two mounting shafts close to each other are jointly fixedly connected with a rotating ring arranged in an inclined mode. The grinding barrel is driven by the switching assembly to adjust the inclination with the axis center, so that the raw material powder can be subjected to step-by-step ball milling in the two grinding cavities in sequence, the particle size of the raw material powder is rapidly reduced under the action of large grinding media, the total ball milling time is reduced, the occurrence of cold welding is reduced, the raw material powder is subjected to high-precision ball milling through small grinding media, the raw material powder is further refined, the influence of cold welding on the ball milling quality is reduced, and the agglomeration phenomenon is reduced.

The invention discloses a material mechanical property testing device oriented to an extreme pressure environment, relates to the technical field of mechanical testing, and solves the problems that an existing traditional device needs complex dynamic sealing and pressure compensation under high hydrostatic pressure based on a motor scheme, and heat dissipation difficulty and cold welding risk exist under high vacuum; in order to solve the problem of insufficient measurement precision under small deformation based on a scheme of a spring dynamometer, a clamping mechanism is mounted on a main frame in a sliding manner through a linear guide rail and is used for clamping a test piece; the two-stage constant tension mechanism is mounted on the main frame and is used for applying acting force to the tightening mechanism; the displacement amplification mechanism is mounted on the main frame and is used for reading the smaller deformation of the test piece on the lower graduated scale; and the moving pointer is connected with the tightening mechanism and is used for reading the larger deformation of the test piece on the upper graduated scale. The device is simple in structure and low in cost, and is particularly suitable for testing the mechanical properties of materials in two extreme environments.

The invention discloses a high-binding-force low-temperature anti-cold-welding amorphous carbon-based film layer and a preparation method thereof, and belongs to the technical field of surface engineering. The film layer comprises a metal bonding layer, a metal carbide transition layer and a plurality of low-stress lubricating anti-cold-welding layers which are arranged in sequence. Wherein the low-stress lubricating anti-cold-welding multilayer is composed of a-C: H with higher hardness and a-C: H-SiOx with lower hardness in an alternating manner. The plasma enhanced chemical vapor deposition technology is adopted, the multi-layer structure with the a-C: H hard layers and the a-C: H-SiOx soft layers alternating is prepared in a deposition mode, the intrinsic stress of the amorphous carbon layer can be effectively regulated and controlled while the vacuum friction characteristic of the film layer is guaranteed, and therefore the film layer binding force is improved. A multi-layer composite structure film layer is deposited on the surface of a metal base material such as titanium alloy, aluminum alloy, stainless steel and bearing steel, and the requirement for the cold welding prevention and lubrication integration function of a valve dynamic sealing component under the low-temperature condition in deep space exploration is met.

The application provides a reliable separation system and method for separating a service space load, which comprises an electrical separation connector, a cutter, an anti-falling pyrotechnic lock, a power supply / charge management module and a separation controller; the electrical separation connector is a main means for realizing electrical separation of a satellite platform and a separation load; the cutter is a backup means for realizing electrical separation of the satellite platform and the separation load, and is used for cutting a cable to realize separation when the electrical separation connector cannot normally separate; the anti-falling pyrotechnic lock is used for connecting a plug and a socket of the electrical separation connector; the power supply / charge management module is used for managing charging and power supply of the separation load; and the separation controller is used for controlling the electrical separation connector, the cutter and the anti-falling pyrotechnic lock. The application aims at the problem that the traditional electrical separation connector cannot normally separate due to vacuum cold welding of the separation load in long-term on-orbit, and ensures reliable separation by designing the cutter as a backup means.

The invention belongs to the technical field of vacuum focusing, and relates to a focusing assembly for lunar remote Raman spectrum detection and a use method. Comprising a focusing group lens frame, a focusing optical lens is arranged in the focusing group lens frame, a main lens barrel sleeves the focusing group lens frame, a cam assembly is arranged outside the main lens barrel, the cam assembly penetrates through the main lens barrel through a guide nail and is fixedly connected with the focusing group lens frame, and a plurality of taper hole groups are formed in the outer wall of the focusing group lens frame. Taper holes in each taper hole group are distributed along a straight line parallel to the optical axis, the taper hole groups are uniformly distributed along the circumferential direction of the focusing group lens frame, supporting steel balls are arranged on the taper holes, a plurality of linear V-shaped guide rails are arranged on the main lens barrel, the linear V-shaped guide rails are in contact with the supporting steel balls, and dense steel balls are arranged between the main lens barrel and the cam assembly. An outer gear of the cam assembly is connected with the power assembly. Through steel ball point supporting isolation and full-dry type friction transmission design, pollutants are prevented from being generated in a light path, the problem of vacuum cold welding is effectively solved, and the remote focusing function is achieved.

The invention discloses a method for controlling a universal celestial body to directionally fall to a preset designated area, and relates to the technical field of space mining and space junk recovery. The method comprises three subsystems Na, Hi and Da which cooperatively operate in sequence: the Na subsystem determines a force application parameter through orbit measurement and calculation, and enables a target celestial body to accurately fly to a preset designated area by adopting an instant external force or continuous thrust mode; the Hi subsystem is used for carrying out gravity-free reagent full-automatic film removal pretreatment on captured space junk in a space environment, and the junk and a target celestial body are attached and fixed or the junk is subjected to mutual cold welding to form a protective shell by utilizing the natural cold welding characteristic of space; the Da subsystem captures space junk in a wide area through an expandable net body and gathers the space junk, and the net body is recycled after a protective shell is formed. Directional falling of the target celestial body and space junk recycling are synchronously achieved, and the method has the advantages of being low in cost, good in protection effect, free of ethical risks and the like and can be used for civil scenes such as aerolite mineral mining, space junk cleaning and interstellar base supply.

The utility model provides a CBN (Cubic Boron Nitride) milling cutter blade for strong arc cutting, which is characterized in that the radius of a cutter point arc of the CBN milling cutter blade for strong arc cutting is 3.3 mm, and the cutting auxiliary deflection angle is 1 degree; the longitudinal relief angle of the CBN milling cutter blade for strong arc cutting is 15 degrees. According to the utility model, the polycrystalline cubic boron nitride (CBN) material is adopted, so that multiple excellent performances such as lower friction force proportion, high temperature resistance, high durability, high physical wear resistance, high chemical wear resistance, high crescent wear resistance, high mechanical wear resistance, high cold welding wear resistance and the like are realized. The radius of the CBN blade is 3.3 mm, so that the sleeking resistance is small under the conventional feeding condition, it is guaranteed that a cut face is smooth, precise, uniform and fine, the blade can conduct small-stress cutting feeding, and a workpiece has better surface quality. And meanwhile, a large-plane controllable high-quality cutting plane of a machined workpiece alloy material can be guaranteed, and the tool durability is quite good.

This invention discloses a microwave inspection method and system, relating to the field of nondestructive testing (NDT) technology. The method includes: moving a detection unit along a predetermined direction to scan the object under test, obtaining the envelopes of microwave signals to be processed at different locations on the object; the detection unit includes one, two, or four sensors; the microwave signals to be processed are interference signals or microwave signals reflected by the object under test; the interference signal is generated by the interference between the microwave signal emitted by the microwave signal transmitter and the microwave signal reflected by the object; and the location of damage on the object is determined based on the envelopes of the microwave signals to be processed at each location on the object. This invention can improve the accuracy of NDT results and achieve damage detection without macroscopic defects, such as cold welding damage in hot-melt joints.

The present application relates to a kind of preparation methods of high-precision cold welding wear-resistant coating in combustion chamber shell cylinder, comprising the following steps: S1 carries out pretreatment to cold welding matrix 0Cr17Ni4Cu4Nb stainless steel: after solid solution strengthening and aging strengthening to cold welding matrix 0Cr17Ni4Cu4Nb stainless steel, in turn, machining treatment, cleaning, drying are carried out, the matrix after treatment is obtained;S2 cold welding machine cold welding preparation work: first, the position correction of combustion chamber is carried out;Then, light point is checked;Adjust the spacing of welding wire and workpiece, and the spacing of tungsten electrode and welding wire;Finally, check whether gas cylinder, cooling water is opened, check whether the parameters of high-precision cold welding machine and its displacement machine parameters and the speed of robot are matched;S3 high-precision cold welding machine is automatically sent wire, and high-precision cold welding wear-resistant coating is obtained.The present application is stable in operation, process parameter is matched, the obtained coating can significantly improve the tribological properties of substrate, and the bonding strength with matrix is high.

The application relates to a preparation method of a niobium titanium oxide / liquid metal composite negative electrode material and application of the niobium titanium oxide / liquid metal composite negative electrode material in a low-temperature lithium ion battery, and belongs to the field of secondary batteries. The method is as follows: TiNb2O7 microspheres are synthesized, SnO2 is deposited on the surface of the TiNb2O7 by adopting an atomic layer deposition technology and taking SnCl4 and H2O as precursors, and TNO@Sn material is obtained through hydrogen reduction; TNO@Sn powder, Super P and PVDF are uniformly mixed in a solvent to prepare a slurry, the slurry is coated on a copper foil current collector, and an electrode sheet is obtained through rolling; Ga-In-Sn ternary eutectic liquid metal is prepared, the liquid metal is uniformly sprayed on the surface of the electrode sheet in an Ar atmosphere glove box, the Ga-In-Sn liquid metal / TiNb2O7 composite negative electrode is prepared in a "cold welding" mode, the interface bonding force between the liquid metal and the active particles is enhanced through an alloying reaction, the composite process temperature is reduced, and the damage of high temperature to the material is avoided. Meanwhile, the flowability, self-healing and high conductivity of the liquid metal compensate for and enhance the ion / electron transmission deficiency of the TiNb2O7 composite electrode at low temperature, and high safety is ensured.

This invention discloses a multifunctional fish-scale surface texture that reduces tool stress concentration and is composed of multiple basic units. Each basic unit is a fish-scale shaped pit, and the multiple basic units are uniformly arranged in a matrix shape, a circumferential shape, or a circular ray shape. This invention also discloses a method for preparing the multifunctional fish-scale surface texture that reduces tool stress concentration. This invention is used to reduce cutting temperature, mitigate cold welding, adhesion, and diffusion phenomena, increase tool wear resistance, and extend tool life.

The utility model discloses a cold -forging radiator stamping positioning die relates to cold -forging die technical field, aims at solving the current stamping positioning die in the mode, and the upper die and radiator appear " cold welding " phenomenon situation cannot carry out normal material taking technical problem, including lower mould and upper die. The utility model discloses through design support, first electric hydraulic push rod, mounting bracket and auxiliary rod etc. structure, when the lower mould and upper die open mode, if the radiator after cold -forging forming and upper die occur " cold welding " phenomenon, personnel can directly control the first electric hydraulic push rod on support and push down mounting bracket, when mounting bracket drives the synchronous descent of several groups of auxiliary rods at its bottom, when auxiliary rod will descend in the cavity of upper die punch head, thereby can exert the downward thrust to radiator, thereby can quickly realize the separation of radiator and upper die, guarantee personnel can take normal spare, improve the convenience of device use.

The invention relates to a preparation method of an in-situ reaction aluminum oxide nanoparticle reinforced aluminum-based boron carbide composite material. The preparation method comprises the following steps: carrying out low-speed ball-milling deformation flaking on aluminum powder to obtain flaky aluminum powder, and controlling the oxygen content in a ball-milling atmosphere to form an oxide film nano layer on the surface of the powder to obtain nano oxidized flaky aluminum powder; then, high-speed ball milling is carried out, so that an oxidation film nano layer is broken and is dispersed and distributed in a crystal or a crystal boundary, high-speed ball milling and cold welding granulation are carried out, and aluminum oxide nano particle reinforced aluminum-based composite powder is obtained; and finally, uniformly mixing with boron carbide micron particles, compacting, sintering and carrying out deformation processing to prepare the aluminum-based boron carbide composite material. According to the preparation method, an oxidation film nano layer is obtained through in-situ oxidation, aluminum oxide nano particles are obtained after high-speed ball milling and crushing, the nano particles are evenly distributed and dispersed, interface bonding is good, the method is simple and controllable, and the method is suitable for large-scale and low-cost preparation; the aluminum-based boron carbide composite material can be used for neutron absorption application scenes such as spent fuel storage and transportation and post-treatment.

The invention belongs to the technical field of preparation of thermoelectric semiconductor materials, and provides a method for synthesizing an Mg3 (Bi, Sb) 2-based material through ball milling in order to solve the problems that in the process of synthesizing a magnesium-based material through a ball milling method, the preparation time is long, and components are not uniform due to material cold welding caking, and the like, and the method comprises the steps that high-purity Bi particles, high-purity Sb particles and high-purity Mg chips are weighed in a glove box under the inert atmosphere; secondly, in a glove box, Bi particles and Sb particles are placed in a ball milling tank, ball milling balls with different diameters are added, and then pre-ball milling is conducted under the inert atmosphere; the preparation method comprises the following steps: pre-ball-milling Bi and Sb powder, adding Mg chips under the protection of an inert atmosphere after pre-ball-milling, fully mixing the ball-milled Bi and Sb powder with the Mg chips, and then ball-milling in the inert atmosphere to obtain the Mg3 (Bi, Sb) 2-based material. By changing the feeding sequence and optimizing the feeding particle size, the specific surface area of the powder is increased, the reaction speed of the powder and the Mg element is increased, and the phenomena of adhesion of the material and the tank wall and cold welding agglomeration are prevented, so that the material synthesis efficiency and the component uniformity are improved.

Vacuum electron devices (VEDs) are produced having a plurality of two-dimensional layers of various materials that are bonded together to form one or more VEDs simultaneously. The two-dimensional material layers are machined to include features needed for device operation so that when assembled and bonded into a three-dimensional structure, three-dimensional features are formed. The two-dimensional layers are bonded together using brazing, diffusion bonding, assisted diffusion bonding, solid state bonding, cold welding, ultrasonic welding, and the like. The manufacturing process enables incorporation of metallic, magnetic, and ceramic materials required for VED fabrication while maintaining required positional accuracy and multiple devices per batch capability. The VEDs so produced include a combination of magnetic and electrostatic lenses for electron beam control.

This utility model relates to the field of cold welding machine technology, and more particularly to a dental cold welding machine. It includes a housing, end caps, bottom caps, anti-slip strips, a mounting base plate, a capacitor energy storage unit, a fixing frame, fixing screws, a control main board, a first electrode connection plate, a welding gun socket, a mounting bracket, a fixing bracket, a socket connection plate, a second electrode connection plate, a third electrode connection plate, a display screen, an adjustment knob, a foot switch socket, a start switch, a charging socket, and a terminal block. This utility model adopts a modular, split-type structural design, allowing the core power supply, control main board, and other structures to be independently disassembled and maintained, reducing fault repair costs. Simultaneously, these components are integrated into the housing, minimizing the weight and size of the main unit, achieving a portable design for the cold welding machine. This facilitates portability and mobility, making it suitable for clinic and laboratory environments. It achieves instant welding through high current and low heat generation.

This invention belongs to the technical field of hydrolysis hydrogen production materials, specifically relating to a cold-welding-free magnesium-based hydrolysis hydrogen production powder material and its preparation method. The cold-welding-free magnesium-based hydrolysis hydrogen production powder material is composed of Mg in a mass ratio of 80-95:5-20. x Ca 1‑x It is composed of alloy hydride and expanded graphite; the value of x ranges from 0.7 to 1. In the preparation of powder materials, Mg... x Ca 1‑x After the alloy is pulverized, expanded graphite is added, and then the mixture is ball-milled to obtain Mg. x Ca 1‑x Alloy-expanded graphite powder is repeatedly activated and hydrogenated to obtain Mg. x Ca 1‑x Alloy hydride-expanded graphite composite material. The addition of expanded graphite can effectively suppress the cold welding phenomenon that occurs during ball milling, improve the powdering efficiency, and also effectively reduce the particle size and promote hydrogenation, thereby increasing the hydrogen production from hydrolysis. This is conducive to the large-scale industrial production of the material and has ideal application value.