1465 results about "Gas protection" patented technology

The invention discloses a vacuum cup laser welding device, and belongs to the technical field of laser welding, the vacuum cup laser welding device comprises a processing table, the top of the processing table is connected with a base box, and the top of the base box is provided with a synchronous clamping assembly. According to the device, the air curtain assembly is arranged, a continuous and uniform annular laminar flow air curtain is formed by means of the nozzle array evenly distributed in the circumferential direction, a stable inert gas protection environment is formed in a welding area, the oxidation probability of a molten pool is remarkably reduced, meanwhile, the air curtain structure optimally designed through fluid dynamics can effectively disperse welding smoke dust, and the welding quality is improved. By means of a mechanical structure, the angle of the direction adjusting pipe can be accurately adjusted, the coverage range of the air curtain can be flexibly adjusted, accordingly, the vacuum cup body with different specifications can be adapted, possible protection blind areas are eliminated, and the service life of the vacuum cup body is prolonged. And the optimal action angle between the welding protection airflow and the workpiece surface is always kept.

The invention discloses a 1100 MPa grade ultrahigh strength wire rod which comprises the following components in percentage by weight: 0.065 wt% to 0.18 wt% of C, 1.13 wt% to 1.82 wt% of Si, 1.59 wt% to 1.97 wt% of Mn, 0.41 wt% to 0.98 wt% of Cr, 3.25 wt% to 4.62 wt% of Ni, 0.41 wt% to 0.98 wt% of Mo, less than or equal to 0.12 wt% of Cu, 0.04 wt% to 0.10 wt% of Ti, less than or equal to 0.002 wt% of P, less than or equal to 0.015 wt% of S, less than or equal to 0.5 wt% of V and the balance of Fe and inevitable impurities. The invention further discloses a preparation method of the wire rod. The strength can reach 1100 MPa while the low-temperature toughness of minus 40 DEG C is met, the solid gas shielded welding wire with the corresponding strength level is prepared, Q1100E is matched for welding, and the cost is low.

The utility model relates to the technical field of gas guiding of gas shielded welding guns, in particular to a gas guiding assembly of a gas shielded welding gun, which comprises a gas inlet pipe, a contact tube arranged at one end of the gas inlet pipe and gas dispersing holes arranged on the side wall of the gas inlet pipe. The side wall of the flow dividing sleeve is provided with a plurality of flow dividing holes, the inner wall of the flow dividing sleeve is provided with a vent groove, the flow dividing holes are communicated with the vent hole through the vent groove, the air inlet pipe is sleeved with an insulating cylinder, one side of the insulating cylinder is provided with a spray pipe, a spiral blade is sleeved with the spray pipe, and the spiral blade is arranged on the air inlet pipe in a sleeved mode. And the shunting hole and the contact tube are positioned in the spiral blade. The utility model provides a gas guide assembly of a gas shielded welding gun, which can reduce turbulent flow formed in a welding area, improve the welding quality and conveniently clean welding slag, and is used for overcoming the defects in the prior art.

The invention belongs to but is not limited to the technical field of aluminum alloy preparation, and discloses a high-plasticity aluminum alloy prepared from secondary aluminum and a preparation method, high-quality secondary aluminum waste is selected, and obvious impurities are removed; carrying out chemical or mechanical cleaning on the secondary aluminum, and sorting; the pretreated secondary aluminum waste is added into a smelting furnace to be smelted; a purifying agent is added for melt purification; the melt is further purified through inert gas stirring and standing; adding a proper amount of alloy elements into the melt; under the protection of inert gas, uniformly stirring the melt; casting the melt into a cast ingot by adopting a semi-continuous casting or continuous casting process; controlling the cooling speed; carrying out homogenizing heat treatment on the cast ingot to eliminate composition segregation in the cast ingot; and extruding and rolling to obtain the high-plasticity aluminum alloy material. According to the method, the purity of the aluminum alloy is improved, the performance uniformity is enhanced, and the aluminum alloy material with high plasticity and excellent mechanical performance is obtained and is suitable for industrial application with high requirements.

The invention relates to the field of steelmaking. More specifically, the invention relates to a process for controlling nitrogen increase in electric furnace smelting. The invention provides a method for producing low-nitrogen steel from electric furnace full waste steel. The method specifically comprises the steps that waste steel is loaded into an electric furnace, CO2 gas is injected into the electric furnace before and after loading, air is exhausted, and micro-positive pressure in the electric furnace is kept. The method comprises the following steps: after an electric furnace forms a molten pool, injecting limestone powder at the top of the furnace with the injection amount of 60-80kg / t and the injection carrier gas of CO2 gas, after the electric furnace forms the molten pool, injecting oxygen and carbon powder by adopting a carbon-oxygen lance to make foamed slag, injecting CO2 gas into the molten pool to decarburize, produce two times of CO gas and intensify denitrification, and during tapping of the electric furnace, protecting steel flow from ending with air by adopting CO2 gas, and feeding into the next process for smelting after tapping of the electric furnace. Application proves that when the method is used for smelting low-nitrogen steel, nitrogen in the electric furnace can be controlled not to be increased, N is smaller than or equal to 0.003% after tapping of the electric furnace, the smelting rate of the low-nitrogen steel grade is increased, and low-carbon emission production of special varieties is achieved.

The invention relates to a nickel-based alloy composite plate and a preparation method thereof, and belongs to the technical field of alloy preparation. The alloy reinforcing agent is prepared under the sintering condition of high-temperature reducing gas protection by mixing the lanthanum element and the nanometer aluminum oxide, the granularity can be refined in the smelting process by adding the alloy reinforcing agent, and the wear resistance, hardness, strength and oxidation resistance of the alloy are effectively improved. Nickel is used as a matrix, an alloy reinforcing agent and elements such as molybdenum, copper, boron and hafnium are added, meanwhile, a mixture of potassium chloride and magnesium fluoride is used as a fluxing agent, uniform mixing and reaction of alloy components are promoted, and the nickel-based alloy smelted through step-by-step heating in vacuum has high hardness and strength and good abrasion resistance, corrosion resistance and high temperature resistance; and the stainless steel substrate and the nickel-based alloy plate are tightly combined through welding treatment, and the nickel-based alloy composite plate is suitable for manufacturing a vacuum chamber.

The invention discloses a welding device and method for a rocket engine jet pipe, and belongs to the technical field of aerospace engine welding. The welding device for the rocket engine jet pipe comprises a first tool used for clamping a to-be-welded scalloped segment of the engine jet pipe, a second tool used for clamping a to-be-welded barrel and a gas protection supporting cover used for conducting inert gas protection on the front face of a welding seam of the engine jet pipe. The first tool comprises a first inner supporting piece, the first inner supporting piece is sleeved with a pressing plate, and the pressing plate is provided with a first pressing structure for pressing the edge of the scalloped segment; the second tool comprises a second inner supporting piece and a third inner supporting piece which are used for supporting the barrels, and a pressing mechanism for pressing the splicing positions of the adjacent barrels is arranged outside the second inner supporting piece or the third inner supporting piece. By the adoption of the welding device and method for the rocket engine jet pipe, the problems that an existing engine jet pipe is prone to being oxidized when welded in the atmosphere, defects are generated, and the welding cost is high can be solved.

The invention provides an anti-wind device for gas shielded welding and a welding system. The anti-wind device for gas shielded welding comprises a tube shell, the tube shell is arranged outside a gun head of a welding gun in a sleeving mode, and a shielding gas containing cavity surrounding the gun head is formed between the tube shell and the gun head; the casing pipe is arranged outside the pipe shell in a sleeving mode, and an airflow drainage cavity surrounding the outside of the pipe shell is formed between the casing pipe and the pipe shell; the air source connector is arranged on the sleeve and communicated with the airflow drainage cavity, and the air source connector is used for guiding airflow from an air source into the airflow drainage cavity; the airflow drainage cavity is used for guiding airflow in the axial direction of the gun head so that the airflow can form an air curtain on the periphery of the shielding gas containing cavity. The anti-wind device can achieve the anti-wind function on the shielding gas, and compared with the prior art, the construction difficulty can be reduced, the equipment resource configuration can be simplified, and the construction cost can be saved.

The invention belongs to the technical field of laser welding, and discloses a multi-parameter cooperative control laser welding method and system.The method comprises the steps that a laser energy control model is established based on material strength-thickness-gap ternary coupling, and the output power of an optical fiber laser is controlled; coaxial three-layer gradient gas is adopted for protection of a welding area, preheating before welding and double-temperature-zone gradient annealing after welding are adopted, the output power of an optical fiber laser and the three-layer gradient gas protection flow are regulated and controlled in real time through combination of multiple sensors and a control algorithm, the temperature of a heat affected zone is monitored in real time, and a cooling nozzle is controlled for cooling. And continuous parameter optimization is achieved through machine learning, and multi-parameter control laser welding is achieved.

The invention relates to a laser surface remelting method for improving corrosion resistance of a low-alloy steel weld joint, and belongs to the technical field of metal surface treatment and protection. The method comprises the following steps: (1) preparing a low-alloy steel welding seam by adopting gas metal arc welding; (2) polishing the low-alloy steel welding seam, immersing the welding seam in a treating fluid, and carrying out ultrasonic treatment, cleaning and drying to obtain the treated low-alloy steel welding seam; and (3) carrying out laser surface remelting treatment on the surface of the treated low-alloy steel welding seam by adopting an optical fiber laser. The laser surface remelting technology is simple in process, the influence of oxides and impurities on the surface of the welding seam on the quality of the welding seam is reduced through layer-by-layer treatment, efficiency is high, pollution is avoided, and the corrosion resistance of the low-alloy steel welding seam obtained through treatment is effectively improved.

A copper-aluminum composite plate material prepared by aluminum liquid continuous casting and a process thereof. The method includes: S1, heating an aluminum ingot to 700-800° C. and smelting for 1-3 h; S2, degassing smelted aluminum liquid, and keeping the temperature and standing; S3, texturing a copper strip, and then cleaning; S4, heating the pretreated copper strip to 200-650° C.; S5, under the protection of inert gas, continuously casting the treated aluminum liquid on the treated copper strip, performing quenching crystallization on a copper-aluminum composite material, and performing oxygen-free continuous casting; and S6, continuous rolling: rolling the continuously cast copper-aluminum composite material to obtain the copper-aluminum composite plate material prepared by aluminum liquid continuous casting.

The invention discloses a gas shielded automatic welding process and system for a consumable electrode of a nuclear power mechanical penetration piece. The process comprises the following steps: inputting parameters of the mechanical penetration piece into an automatic welding system; selecting a welding groove type based on the parameters of the mechanical penetration piece, and determining an initial welding process parameter range; identifying a welding seam and actual welding groove information; based on actual welding groove information, an initial welding process parameter range is automatically matched and adjusted through an automatic welding system, and actual welding process parameters are determined; according to the welding process, the welding operation is carried out by automatically matching the parameters required by welding, the whole process is automatically operated, the operation is simple, and the conditions that the welding efficiency of the mechanical penetration piece is low and the welding quality is unstable can be effectively avoided.

The invention relates to a high-capacity Mg-RE (Ce, Y)-Sc-A < l-Ca >-based solid hydrogen storage alloy for a fuel cell and a preparation method thereof, the hydrogen storage alloy comprises the following components: Mg95-x-yCexYySc0.5 A < 4.5-z > Caz + m wt.% (NbF5 + V2O5), x, y and z in the formula are atomic ratios, 0.5 < = x < = 2, 0.5 < = y < = 2, 0.5 < = z < = 3, m is the percentage of NbF5 + V2O5 in the alloy, 2 < = m < = 8, and the mass ratio of NbF5 to V2O5 is 1: 1. The preparation method comprises the following steps: carrying out induction heating smelting under the protection of inert gas, and injecting molten alloy into a copper casting mold to obtain an alloy ingot; after the cast ingot is put into a quartz tube to be subjected to induction heating melting, under the pressure action of inert gas, liquid alloy continuously falls on the surface of a rotating water-cooling copper roller in a jetting mode, and rapid quenching alloy of a nanocrystalline microstructure is obtained; and the rapidly quenched alloy is subjected to mechanical crushing and sieving, and then is subjected to ball milling together with catalysts NbF5 and V2O5 in a high-purity argon gas environment, so that the ultrafine grain alloy powder is obtained. Through component design, microstructure regulation and control and addition of a multi-element catalyst, the thermal stability of alloy hydride is reduced, and the hydrogen absorption and desorption thermodynamic and dynamic performance of the alloy is improved.

The invention discloses a local area inert gas protection auxiliary vacuum environment laser welding device and method, belongs to the technical field of laser welding, and aims to solve the problem that the laser welding quality of an existing easily-oxidized material is insufficient. A local area inert gas protection auxiliary vacuum environment laser welding device comprises a monitoring and feedback control system, a gas precise control system and a vacuum cavity, a gas nozzle, a workbench and a laser welding head are all arranged in the vacuum cavity, the laser welding head is located above the workbench, the gas nozzle is arranged on one side of the laser welding head, and the gas nozzle is arranged on the other side of the laser welding head. The vacuum pumping system is connected with the vacuum cavity, the laser welding head is connected with the laser welding machine, the gas precise control system controls the flow and the mixing proportion of inert gas jetted by the gas nozzle, and the monitoring and feedback control system monitors the temperature, the vacuum degree, the oxygen content and the plasma state of a welding area. And data are fed back to carry out closed-loop regulation control on various welding parameters. And the welding quality is greatly improved.

In order to simplify an existing gas protection device in welding and keep effective protection of the gas protection device on a welding seam, the utility model provides a welding back protection tool device which comprises a base frame with a gas containing cavity, a gas inlet is formed in one end of the base frame, an exhaust port is formed in the other end of the base frame, and a plurality of telescopic cylinder assemblies are arranged around the exhaust port. And a sealing blade is arranged on the outer side of the telescopic cylinder assembly. In the specific using process, a stable and pure gas environment can be provided for a welding area, and therefore the welding reliability and quality are remarkably improved. In addition, the device can be installed on a movable device in the prior art to synchronously follow a welding gun so as to stably and continuously protect a welding spot.

The invention provides an aluminum-based composite material reinforced by nickel-coated silicon carbide through a magnetron sputtering dry method and a preparation process of the aluminum-based composite material, and relates to the technical field of metal-based composite materials and advanced electronic packaging thermal management materials. Comprising the following steps that S1, silicon carbide particles coated with nickel through a magnetron sputtering dry method and aluminum powder are put into a mold to be subjected to compression molding, and an initial blank is obtained; and S2, the initial blank prepared in the step S1 is placed in a re-pressing sintering furnace under the inert gas protection condition, continuous re-pressing is conducted under the temperature condition ranging from the temperature lower than the aluminum melting point by 50 DEG C to the temperature higher than the aluminum melting point by 200 DEG C, and the nickel-coated silicon carbide reinforced aluminum-based composite material obtained through the magnetron sputtering dry method is obtained. The aluminum-based composite material reinforced by magnetron sputtering dry nickel-coated silicon carbide disclosed by the invention is excellent in heat-conducting property and mechanical property and long in service life.

The invention discloses a method for enhancing the laser transmission welding strength of thermoplastic plastics, and relates to the technical field of plastic laser welding, and the method for enhancing the laser transmission welding strength of the thermoplastic plastics comprises the following steps: firstly, degreasing and decontaminating an upper to-be-welded part and a lower to-be-welded part; then the degreased and decontaminated upper to-be-welded part and the degreased and decontaminated lower to-be-welded part are subjected to ultraviolet light activation treatment; then coating the surface of a lower part to be welded with a coating to construct a rigid-flexible interface layer, wherein the coating is a mixture formed by compounding oxidized carbon nanotubes, mussel adhesion protein and deionized water according to the mass ratio of (0.1-5): 10: 100; then the upper to-be-welded part and the lower to-be-welded part are stacked together, and laser transmission welding is conducted under inert gas protection; and after welding is completed, cooling and forming are conducted. When the rigid-flexible interface layer is constructed, through the synergistic effect of the oxidized carbon nanotubes and the mussel adhesion protein, the welding strength and oxidation resistance of the plastic weldment can be improved, and the service life of the weldment can be prolonged.

The invention relates to the technical field of welding devices, and particularly discloses balance oil cylinder welding equipment and a welding process thereof.The balance oil cylinder welding equipment comprises a power system, a welding gun, a wire feeding system, a gas protection system and a cooling system.The welding gun comprises a gun body, a diverter, a conductive sleeve and a nozzle, the conductive sleeve comprises a pipe body, and a through hole penetrating front and back is formed in the pipe body; a threaded section connected with the flow divider is arranged at the tail end of the pipe body, and a plurality of mounting grooves communicated with the through hole are formed in the circumferential surface of the pipe body; the conductive blocks are matched with the mounting grooves in shape, so that the conductive blocks can slide in the radial direction of the pipe body and make contact with the welding wires, the outer sides of the conductive blocks protrude out of the pipe body, pressure is continuously applied through the fastening wires, tight contact between the conductive blocks and the welding wires is kept, poor contact of the welding wires in the abrasion process is avoided, and the service life of the welding wires is prolonged. Therefore, the stability and the quality of the welding process are ensured.

The invention discloses a welding method of a high-strength steel vertical rod for a ring lock type scaffold and the vertical rod. A target high-frequency welded pipe is selected as a vertical rod main body; the gap between the disc buckle and the high-frequency welded pipe is controlled to be 0.3 mm-0. 7 mm through a positioning device; according to a preset target welding process specification, gas shielded welding wires are adopted to conduct angle welding with low welding heat input on the two sides of the disc buckle, and the value of the low welding heat input ranges from 3.23 KJ / cm to 4.94 KJ / cm. Therefore, the high-strength light-weight vertical rod is used, and the vertical rod and the disc buckle are welded according to the target welding process specification, so that the safety of the high-strength steel scaffold vertical rod in use is ensured, the mounting efficiency of the vertical rod is improved, and the working intensity of constructors is reduced.

The invention is applicable to the technical field of welding, and provides a temperature control protection tool for thin-wall welding, comprising: a workpiece to be welded, the workpiece to be welded comprising a first workpiece and a second workpiece, and a weld zone between the first workpiece and the second workpiece; the inner ring cooling workpiece is provided with a cooling flow channel, is attached to the welding seam area and is used for taking away heat near the welding seam; the outer ring cooling tool is provided with a cooling flow channel, and the outer ring cooling tool is attached to the first workpiece and used for reducing the temperature of the first workpiece and protecting a non-welding area; the back gas protection tool is installed between the first workpiece and the second workpiece, located on the back of the weld joint and used for replacing gas in the back area of the weld joint with inert gas. The invention further provides a welding process for thin-wall welding, and the temperature control protection tool is adopted in the welding process. While the welding quality is ensured, brazed welding seams, plating layers, non-metal parts and the like near fusion welding seams are protected from being damaged due to too high temperature.

The invention provides a Q890qE and Q420qE bridge steel flat butt joint combined welding method which comprises the following steps: step 1, grinding and derusting grooves of upper and lower asymmetric double-sided V-shaped joints to expose metallic luster; 2, preheating is conducted in an electric heating mode; 3, a solid welding wire CO2 gas shielded welding is adopted for backing welding of one weld joint on the upper V-shaped deep groove side; 4, welding seams are filled in the side of the V-shaped deep groove through submerged arc automatic welding, and the filling thickness is about 1 / 2 of the groove depth; 5, back gouging is conducted on the back face through carbon arc air gouging, and a carburized layer is polished and cleaned till metallic luster is exposed; 6, the V-shaped shallow groove is welded and filled; seventhly, the submerged arc automatic welding continues to weld the remaining weld joints of the V-shaped deep groove till the remaining weld joints are filled; and 8, postweld heat treatment is conducted. According to the method, a combined welding method of solid welding wire CO2 gas shielded welding bottoming, submerged arc automatic welding filling and capping is adopted, the problems of welding cold cracking and early joint breakage of the dissimilar bridge steel are solved by combining joint design, and the mechanical properties of a welding seam and a fusion area meet the standard requirements.

The invention discloses a welding method for a tower drum and a foundation ring of a wind generating set. Comprising the following steps: a welding preparation stage: carefully selecting and treating materials, strictly debugging equipment and carefully preparing weldments; in the welding implementation stage, an argon-rich mixed gas shielded welding method is determined, welding process parameters are optimized, and the welding processes of a single-section longitudinal seam and a flange, two small-section assembly, large-section assembly length, an inner circular seam and an outer circular seam are accurately controlled; in the welding quality control stage, welding parameters are monitored and adjusted in real time, and appearance inspection after welding, RT ray inspection, mechanical property testing and metallographic testing are strictly conducted; and the production practice and optimization stage is applied to actual production, problems are tracked and solved, and the process is continuously optimized to improve the quality. The method effectively improves the welding quality and the production efficiency, enhances the structural stability, reduces the cost and promotes the development of the wind power industry.

The invention provides a laser polishing device combining gas protection and substrate heat dissipation and a using method. The device comprises a focus lens (1), a laser beam (2), a to-be-polished sample piece (3), a gas nozzle (4), a gas pipe (5), a high-pressure gas cylinder (6), a dust collector (7), a cooling liquid level (8), a metal substrate (9), an objective table (10), a water tank (11) and a laser (12). The invention further relates to a using method of the device. A micro-nano coarse structure is formed on the surface of the metal substrate through chemical etching, electrochemical etching or laser etching and the like, then a hydrophilic oxide layer is introduced through oxidation treatment or plasma treatment, and the super-hydrophilic performance of the metal substrate is further enhanced. The device has excellent liquid cooling capacity, gas protection performance and oxidation resistance, heat can be efficiently conducted and dissipated in the laser polishing process, the temperature uniformity of the surface of a sample is ensured, and overheating and oxidation phenomena are prevented.

According to the efficient multi-wire gas shielded welding gun, three auxiliary gun bodies are integrated in a main gun body shell through a welding gun base, included angles are designed between the axes of the three auxiliary gun bodies and the axis of a main gun body, three electric arcs generated by the three auxiliary gun bodies during welding can be gathered, and welding bead separation generated under small welding parameters is effectively prevented; when the three sublance bodies ignite arcs at the same time, mutual interference among three arcs under large welding parameters is effectively reduced, and stability of the welding process is facilitated; the upper end structure of the welding gun base is designed to be of a hollow structure, circulating cooling of the three sub-gun bodies can be enhanced through external cooling water during welding, meanwhile, the three sub-gun bodies are internally provided with respective water cooling systems, and the water cooling effect of the whole gun body is remarkably improved through the cooling mode, so that large-current and large-voltage welding is achieved.

The invention belongs to the field of powder injection molding, and relates to a method for preparing a high-strength and high-toughness 6-series aluminum alloy through metal powder injection molding, which comprises the following steps: step 1, mixing 6-series aluminum alloy powder and a binder in a mixing mill to obtain a feed; 2, the feed is subjected to injection molding to form a green body; 3, the green body is subjected to catalytic degreasing through oxalic acid, and a brown blank is obtained; step 4, sintering the palm blank by using a vacuum degreasing sintering furnace and adopting inert gas protection negative pressure; and 5, the sintered sample is subjected to heat treatment, and a 6-series aluminum alloy product is obtained. The prepared 6-series aluminum alloy contains nano MgAl2O4 particles, the nano MgAl2O4 particles are distributed in a net shape at the grain boundary, the density of the 6-series aluminum alloy is larger than 99%, and the tensile strength of the 6-series aluminum alloy is larger than 350 Mpa.

The invention provides a high-wear-resistance and low-dilution gas shielded welding wire and a preparation method thereof, and belongs to the technical field of welding wire manufacturing. The welding wire consists of the following raw materials in parts by weight: 45-52 parts of iron; 18-22 parts by weight of an electrolytic nickel plate; 6-8 parts by weight of high-purity molybdenum powder; 4-6 parts by weight of nano tungsten powder; 3-4.5 parts by weight of a vanadium nitride alloy; 1.2 to 1.8 parts by weight of a niobium-iron alloy; 0.8-1.5 parts by weight of aluminum magnesium alloy powder; 0.3 to 0.6 part by weight of lanthanum cerium mixed rare earth; 0.15 to 0.25 part by weight of ferroboron alloy; 0.5 to 0.8 part by weight of metal silicon powder; 0.2 to 0.4 part by weight of a magnesium-calcium alloy; and 0.1-0.3 part by weight of titanium hydride powder. The hard framework is formed through gradient distribution of carbides such as molybdenum, tungsten and vanadium, the wear-resisting life is remarkably prolonged, melting mixing of base metal is reduced through the nickel-based alloy, the consistency of deposited metal components is ensured, free hydrogen is fixed through hydrogen trap phases such as titanium and niobium, and a moisture absorption path is blocked in combination with a surface passivation film.

The invention relates to the field of welding equipment, and discloses an air source heat pump shell machining and welding device which comprises a machining table, a guide rail is fixedly installed on the upper surface of the machining table, movable seats are movably installed on the two sides of the guide rail, and a discharging table is fixedly installed over the machining table through a support. Straight notches are formed in the two sides of the upper surface of the discharging table, wedge-shaped connecting blocks are fixedly installed at the top ends of the movable seats, the top ends of the wedge-shaped connecting blocks penetrate through the straight notches in the corresponding sides and are fixedly provided with positioning plates, and a vertical cabinet is fixedly installed on the rear side of the top end of the machining table. The bottoms of the inner side ends of the hollow bent air inlet pipe and the hollow bent exhaust pipe are fixedly installed at the two ends of the laser welding gun correspondingly. Workpieces can be accurately positioned and clamped, weld joints can be evenly butt-jointed, the three-way movement module is matched with the variable-angle welding gun to achieve flexible welding, gas protection and water vapor cooling can be conducted, the welding quality and efficiency are improved, and the application range is wide.

The invention relates to an inner cavity curved surface welding line laser light path turning welding method which is used for solving the technical problem that an existing welding method is difficult to operate when curved surface welding is carried out in an inner cavity, and the method comprises the steps that a reflecting mirror is arranged on a light emitting path of a laser welding head, and original laser beams are deflected; the laser beam enters the inner cavity space and irradiates the to-be-welded area of the curved surface weld joint; surface cleaning and fixing are conducted on a to-be-welded area, and the folded laser beams are focused to the center of a welding seam; enabling the laser beam to perform scanning welding on the curved surface welding seam according to a preset scanning track; in the welding process, protective gas is jetted to the position, acting on the workpiece, of the laser beam so as to blow away welding spatter and provide gas protection for a welding seam. The propagation direction of laser beams is changed through the reflecting mirror, so that laser can enter the inner cavity to weld a curved surface weld joint, the application range of laser welding is expanded, and the problem that curved surface welding is difficult to operate in the inner cavity space through an existing welding method is solved.

The invention belongs to the technical field of metal part machining equipment, and particularly relates to a metal part welding device which comprises a straight seam welding machine body, a linear driving assembly and a connecting plate, and a fixing assembly is arranged at the left end of the straight seam welding machine body; the welding mechanism comprises a mounting seat mounted on the connecting plate, and a welding head is mounted on the mounting seat; the auxiliary mechanism comprises an air injection part rotationally arranged on the outer ring of the welding head, and a driving part and a cooling part are further fixedly installed on the welding head; and the preheating mechanism comprises a gas conveying part arranged on the side face of the straight seam welding machine body, plugging parts are arranged on the top face of the straight seam welding machine body in an array distribution mode, and a control part is arranged on the mounting base. By integrating inert gas protection, efficient cooling and intelligent preheating functions, the welding quality and production safety are remarkably improved, and meanwhile the high-precision and efficient automatic welding process is achieved.

The invention discloses a 1000MPa-grade high-strength and high-toughness solid copper-plating-free welding wire, a preparation method thereof and a large-heat-input argon-rich mixed gas shielded welding method. The invention belongs to the technical field of welding. The problems that during large heat input welding, a weld joint structure of a common welding wire is thick and large, the strength and toughness of a weld joint are reduced, and a welding wire and a welding technology matched with 1000MPa-grade high-strength steel do not exist are solved. The welding wire is prepared by regulating and controlling the components of the welding wire and adopting the vacuum induction furnace smelting and the roller die and eye film drawing technology, the chemical components of the welding wire are more accurately controlled, the higher wire feeding performance is guaranteed, and by means of the large-heat-input argon-rich mixed gas shielded welding method matched with the welding wire, the welding quality is improved. And the high wire feeding speed and the welding joint performance during large heat input welding wire are better facilitated. Therefore, when the low-alloy high-strength steel plate is welded, the welding wire and the welding technology are utilized, the welding work can be rapidly and efficiently completed by adopting large heat input, and it is guaranteed that the welding seam performance is good.