CN113172306A - Hollow electrode wire feeding electric arc additive manufacturing system and method - Google Patents
Hollow electrode wire feeding electric arc additive manufacturing system and method Download PDFInfo
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- CN113172306A CN113172306A CN202110438504.1A CN202110438504A CN113172306A CN 113172306 A CN113172306 A CN 113172306A CN 202110438504 A CN202110438504 A CN 202110438504A CN 113172306 A CN113172306 A CN 113172306A
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- 229910052751 metal Inorganic materials 0.000 claims abstract description 28
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/04—Welding for other purposes than joining, e.g. built-up welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/12—Automatic feeding or moving of electrodes or work for spot or seam welding or cutting
- B23K9/133—Means for feeding electrodes, e.g. drums, rolls, motors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
Abstract
The invention discloses a wire feeding electric arc additive manufacturing system and method for a hollow electrode, wherein an additive manufacturing device comprises a wire wheel and a substrate, a molten pool is formed after the surface of the substrate is electrified, a metal welding wire is fed into the molten pool through an internal channel of the hollow electrode of a welding and arc starting device for the hollow electrode by the wire wheel to be melted and accumulated, the hollow electrode is connected with an inert gas protection device through an argon protection cover, the inert gas protection device can form an inert gas environment to isolate the molten pool from air, and the additive manufacturing of metal is realized by the movement of the substrate in a plane. The invention improves the forming efficiency, simultaneously, the pulse welding current acted on the hollow electrode and the forming substrate can play the roles of stirring a molten pool and effectively refining the crystal structure of a formed part, and the processing time and the cost of metal additive manufacturing parts are reduced.
Description
Technical Field
The invention belongs to the technical field of advanced manufacturing, and particularly relates to a wire feeding electric arc additive manufacturing system and method for a hollow electrode.
Background
Due to the rapid development of the production process and the increasing cost of the materials, the special requirements are difficult to meet by only one material, and the advantages of each material can be fully exerted by the dissimilar metal composite structure. However, for the connection of dissimilar alloy pieces, the interface is the weakest link, and the tensile strength and interlayer bonding strength of the formed material are key scientific problems which are urgently needed to be solved at present. The selection of the bonding process becomes one of the key factors affecting the performance of the dissimilar alloy bonding interface. At present, the connection technology for dissimilar alloys has various technologies, including brazing, laser welding, diffusion welding, linear friction welding, electron beam welding, laser three-dimensional forming technology and the like.
The brazing method is characterized in that a material with a melting point lower than that of a base metal is used as brazing filler metal, the brazing filler metal is heated at a certain temperature lower than the melting point of the base metal and higher than the melting point of the brazing filler metal, the liquid brazing filler metal wets the base metal, a joint gap is filled, and the bonding between atoms of the brazing filler metal and the base metal is achieved. The method is suitable for welding thin, small and complex-shaped weldments, and for dissimilar alloy connection which has low-temperature brittleness, hot cracking tendency and the like and can not obtain a satisfactory joint by using a fusion welding method, the brazing method is simple, low in cost and short in period, and is suitable.
Laser welding is a method of bombarding a weld joint with a focused laser beam as a heat source and welding by using the generated heat. It has the features of high energy density, small heat deformation and small heat affected zone, and is suitable for welding high melting point metal and capable of purifying molten pool and purifying weld metal.
Diffusion welding is a pressure welding method which makes two welding parts tightly combined in a vacuum and protective gas environment, and keeps for a period of time at a certain temperature and pressure to make atoms between contact surfaces of two materials mutually diffuse. The process does not need welding rods and flux, does not increase the quality of components after welding, does not need to remove oxide skin, welding slag and welding beading, does not generate defects of air holes, cracks and the like compared with fusion welding such as laser welding, electron beam welding and the like, has small residual stress and small deformation, and is more suitable for thin plate welding.
The linear friction welding utilizes the friction heat generated on the contact surface by the high-frequency low-amplitude reciprocating linear motion of two workpieces to plasticize the metal of the interface, then the motion is stopped to apply upsetting force, and finally the reliable connection of the interface is obtained through diffusion and recrystallization. Because the heat generating mechanism is different from that of diffusion welding, the heat-conducting diffusion welding device has the advantages of diffusion welding, and the heat is concentrated at the friction part in the welding process, so that the heat affected zone is narrower, crystal grains at the interface are fine, and defects are not easy to generate.
Electron beam welding is a method of welding by bombarding a weldment in vacuum with accelerated and focused electron beams to generate heat energy. The electron beam welding has high energy density, excellent welding protection and high efficiency, a heat affected zone of a weldment is small, and a welding seam with higher quality can be obtained compared with other fusion welding methods. Therefore, the metal is widely used for joining refractory metals and dissimilar metals therebetween, and is often used for parts such as blades of automobiles and aircraft engines.
Analysis and comparison of different forming methods show that when 3 connecting processes of brazing, diffusion welding and laser welding are used for connecting dissimilar alloys, the strength of a connecting interface is low due to the limitation of joint form and bonding capacity, and the requirements on mechanical properties cannot be met if the connecting interface is used for connecting structural materials. Diffusion welding and laser welding are also more suitable for thin plate welding. Compared with the 3 connection processes, the penetration force of electron beam welding is stronger, the obtained penetration depth is deeper, the heat affected zone is small, the electron beam welding process is widely applied to dissimilar metal connection, but the electron beam welding process needs a higher vacuum environment, the equipment cost is high, and ray leakage is easily caused. The linear friction welding interface has small crystal grains, is not easy to generate defects, has a narrow heat affected zone, and becomes one of the main technologies in the aviation manufacturing industry. The laser three-dimensional forming technology converts the connection of the massive metal into the direct forming of the powder metal, well limits the component segregation within the particle size and improves the mechanical property of the finished piece. The components with better joint performance can be obtained by adopting linear friction welding, electron beam welding and laser three-dimensional forming technologies, but the components have the problems of high equipment cost, low processing efficiency, poor flexibility and the like.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a system and a method for manufacturing a hollow electrode wire-feeding electric arc additive, which improve the forming efficiency, and simultaneously, the pulse welding current acting on the hollow electrode and the forming substrate can play a role in stirring a molten pool and effectively refining the crystal structure of a formed part, thereby reducing the processing time and cost of the metal additive manufactured part.
The invention adopts the following technical scheme:
a hollow electrode wire feeding electric arc additive manufacturing system comprises a wire wheel and a substrate, wherein a molten pool is formed after the surface of the substrate is electrified, a metal welding wire is fed into the molten pool through an internal channel of a hollow electrode welding arc starting device by the wire wheel to be melted and accumulated, the hollow electrode is connected with an inert gas protection device through an argon protection cover, the inert gas protection device can form an inert gas environment to enable the molten pool to be isolated from air, and metal additive manufacturing is achieved through movement of the substrate in a plane.
Specifically, one end of the metal welding wire is connected with the wire wheel, the other end of the metal welding wire enters the hollow electrode through the space between the first wire feeding wheel and the second wire feeding wheel, and the first wire feeding wheel and the second wire feeding wheel are arranged right above the hollow electrode welding and arc striking device.
Specifically, the hollow electrode is vertically arranged in the argon gas protection cover, and a circulating flow channel and a hollow electrode tightening sleeve are sequentially arranged between the hollow electrode and the argon gas protection cover.
Furthermore, the hollow electrode tightening sleeve is connected with the hollow electrode in an interference fit mode.
Specifically, the hollow electrode is connected with the anode of the welding machine through a hollow electrode lead, and the cathode of the welding machine is connected with the substrate through a substrate lead.
Specifically, the inert gas protection device comprises an argon tank, and the argon tank is connected with an argon protection cover through an argon pipe.
Furthermore, an on-off valve is arranged between the argon tank and the argon pipe.
Further, a pressure gauge is arranged on the argon tank.
The other technical scheme of the invention is that the working method of the wire-feeding electric arc additive manufacturing system of the hollow electrode comprises the following steps that an inert gas protection device operates, argon is introduced into the hollow electrode at the speed of 15-20L/min, and a plasma electric arc is formed between the hollow electrode and a substrate by electrifying, so that a molten pool is formed on the surface of the substrate; feeding a metal welding wire into a molten pool at a wire feeding speed of 2-5 m/min for melting, and forming gas protection on the metal welding wire fed into the hollow electrode and a local area on the surface of the molten pool by the introduced argon; and moving the substrate, and forming a metal part stacked layer by layer after the molten pool is cooled and solidified.
Specifically, after the metal additive manufacturing is completed, the hollow electrode welding arc starting device is closed, then the additive manufacturing device is closed, and finally the inert gas protection device is closed.
Compared with the prior art, the invention has at least the following beneficial effects:
according to the hollow electrode wire feeding electric arc additive manufacturing system, different welding wire materials are fed into the plasma arc area of the hollow electrode and the forming substrate at a high speed and then are directly inserted into a forming substrate molten pool, so that the forming efficiency is improved, and meanwhile, the pulse current acting on the hollow electrode and the substrate can play a role in stirring the molten pool and effectively refining the crystal structure of a formed part, and the method reduces the processing time and cost of metal parts.
Furthermore, the first wire feeding wheel and the second wire feeding wheel ensure that the welding wire has better straightness when entering the internal channel of the hollow electrode while ensuring the smooth wire feeding process, thereby improving the position precision of the welding wire when being fed into the molten pool.
Furthermore, the circulating cooling flow channel can timely and effectively take away heat energy generated by the hollow electrode in the arcing process, and overheating damage of the hollow electrode is avoided.
Furthermore, the interference fit connection is adopted, so that the hollow electrode clamping sleeve (6) can be replaced quickly according to different welding wire materials and diameters, and the welding wire adaptability of the forming equipment is improved.
Furthermore, the welding machine adopts variable polarity welding current, and the variable polarity welding current can effectively remove the metal oxide film on the surface of the deposition layer or the surface of the substrate in time by utilizing the cathode cleaning effect of the variable polarity welding current, so that the oxide inclusion in the deposition is avoided.
Further, the use of an argon line connection increases the flexibility of the forming apparatus.
Furthermore, the air supply flow and the on-off of the air supply can be regulated and controlled through the on-off valve, so that the air consumption is saved.
Furthermore, the real-time argon flow and pressure value are accurately read through the pressure gauge to provide data.
A working method of a hollow electrode wire feeding electric arc additive manufacturing system is used for efficient low-cost electric arc additive manufacturing of different welding wire materials, can effectively refine crystal tissues of formed parts, provides mechanical properties of the formed parts, reduces processing time and cost of metal additive manufacturing parts, and provides an idea for solving the problem of asymmetry between fuse orientation and forming path in current non-consumable electrode electric arc fuse additive manufacturing. In conclusion, different welding wire materials are fed into the plasma arc area of the hollow electrode and the forming substrate at a high speed and then are directly inserted into a forming substrate molten pool, so that the forming efficiency is improved, the pulse welding current acting on the hollow electrode and the forming substrate can play a role in stirring the molten pool and effectively refining the crystal structure of a formed part, and the processing time and cost of metal additive manufacturing parts are reduced.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Wherein: 1. an argon tank; 2. a pressure gauge; 3. an on-off valve; 4. an argon pipe; 5. argon gas protecting cover; 6. a hollow electrode tightening sleeve; 7. a circulating flow passage; 8. a hollow electrode; 9. a first wire feeding wheel; 10. a second wire feeding wheel; 11. a metal welding wire; 12. a wire wheel; 13. a hollow electrode lead; 14. a welding machine; 15. a substrate lead; 16. a substrate; 17. a molten bath.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "one side", "one end", "one side", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
Various structural schematics according to the disclosed embodiments of the invention are shown in the drawings. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
The invention provides a hollow electrode wire feeding electric arc additive manufacturing system, which realizes electric arc additive manufacturing by connecting a hollow electrode welding and arc starting device with an additive manufacturing device, wherein an inert gas protection device is arranged on the hollow electrode welding and arc starting device.
The material increase manufacturing device is used for efficient and low-cost electric arc material increase manufacturing of different welding wire materials, can effectively refine crystal tissues of formed parts, provides mechanical properties of the formed parts, and reduces processing time and cost of metal material increase manufactured parts. The wire-feeding electric arc additive manufacturing method in the hollow electrode provides an idea for solving the problem of asymmetry of fuse orientation and forming path in the current additive manufacturing of non-consumable electrode electric arc fuses.
The additive manufacturing apparatus includes a first wire feed wheel 9, a second wire feed wheel 10, a wire 11, a wire wheel 12, a substrate 16, and a melt pool 17.
The first wire feeding wheel 9 and the second wire feeding wheel 10 are respectively fixed and can rotate around the center; the wire 11 is wound around a central fixed rotatable wire wheel 12, and the other end is clamped between the first wire feeding wheel 9 and the second wire feeding wheel 10.
The substrates 16 are connected to each other, and the substrates 16 are movable in a plane; the power is turned on to form a molten pool 17.
The hollow electrode welding arc striking device adopts the hollow electrode welding arc striking, can form a shallow layer molten pool, avoids large fusion depth, increases fuse wire efficiency and is beneficial to improving forming efficiency.
The hollow electrode welding arc striking device comprises an argon protective cover 5, a hollow electrode tightening sleeve 6, a circulating flow channel 7, a hollow electrode 8, a welding machine anode 13, a welding machine 14 and a welding machine cathode 15.
The argon protective cover 5, the hollow electrode clamping sleeve 6 and the circulating flow channel 7 are sequentially connected in a threaded mode; the hollow electrode clamping sleeve 6 is connected with the hollow electrode 8 in an interference fit mode.
The inert gas protection device is characterized in that argon is introduced into the hollow electrode to provide an ionization medium for forming a plasma arc between the hollow electrode and the forming substrate, and the plasma arc is formed to directly melt the surface of the forming substrate so as to form a molten pool. Meanwhile, the introduction of argon forms effective gas protection for the welding wire fed into the hollow electrode and a local area on the surface of a molten pool, and metal melt is prevented from directly contacting with air to form metal oxide.
The inert gas protection device comprises an argon gas tank 1, a pressure gauge 2, an on-off valve 3 and an argon gas pipe 4, wherein the argon gas tank 1, the pressure gauge 2, the on-off valve 3 and the argon gas pipe 4 are sequentially connected through threads.
Referring to fig. 1, an argon tank 1 is arranged on the ground, and a pressure gauge 2 is arranged on the argon tank 1; the argon gas tank 1 is connected with one end of an argon tube 4 through an on-off valve 3, the other end of the argon tube 4 is arranged in an argon protection cover 5, a hollow electrode 8 is vertically arranged in the argon protection cover 5, a circulating flow channel 7 is sleeved outside the hollow electrode 8, and the outside of the circulating flow channel 7 is connected with the argon protection cover 5 through a hollow electrode tightening sleeve 6; a first wire feeding wheel 9 and a second wire feeding wheel 10 are arranged above the hollow electrode 8, one end of a wire 11 is connected with a wire wheel 12, the other end of the wire enters the hollow electrode 8 after passing through the first wire feeding wheel 9 and the second wire feeding wheel 10, a movable substrate 16 is arranged at the lower end of the hollow electrode 8, a molten pool 17 is formed after the substrate 16 is electrified, the substrate 16 is connected with the negative electrode of a welding machine 14 through a substrate lead 15, and the positive electrode of the welding machine 14 is connected with the hollow electrode 8 through a hollow electrode lead 13.
The working process of the wire feeding electric arc additive manufacturing system for the hollow electrode is as follows:
starting the operation step: the inert gas protection device operates firstly, the on-off valve 3 is in an on state, and the argon forms an inert gas environment at the tail end of the hollow electrode 8 and around the molten pool 17 to isolate the molten pool 17 from air;
the hollow electrode welding arc starting device operates, the welding machine 14 is started, the hollow electrode 8 and the substrate 16 form electric arcs, the substrate 16 is heated, and a molten pool 17 appears; finally, the additive manufacturing device is started, the first wire feeding wheel 9 and the second wire feeding wheel 10 feed the wires 11 into the molten pool 17 to be melted, and meanwhile, the substrate 16 moves in a plane to realize the additive manufacturing function of metal.
Stopping the operation step: the welder 14 of the hollow electrode welding arc starting device is turned off, the additive manufacturing device is turned off, and finally the inert gas protection device is turned off.
In summary, the wire-feeding electric arc additive manufacturing system and method for the hollow electrode of the invention have the following characteristics:
1. the hollow electrode reaches the central position with the highest arc temperature, so that the two metal materials can be more fully fused in liquid and liquid under the action of high temperature, atoms of the two metals can be promoted to be better diffused and chemically reacted with each other, and the quality of the internal structure after forming is optimal.
2. The hollow electrode realizes that the wire is always positioned in the middle of the molten pool after reaching the molten pool, and the wire is symmetrically diffused towards two sides after being molten, so that the wire is protruded in the middle of the molten pool and gently reduced towards two sides, and the texture of the external surface after being formed is more exquisite.
3. The end effector of the wire feeding device is omitted, the complexity of the wire feeding electric arc additive manufacturing system can be simplified, and the difficulty of process building and process realization of the wire feeding electric arc additive manufacturing system is reduced.
4. The water cooling device ensures that the wire is always in a solid state in the hollow electrode, and simultaneously, the temperature of the hollow electrode is in a low-temperature state, so that the hollow electrode is prevented from being melted.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (10)
1. The hollow electrode wire feeding electric arc additive manufacturing system is characterized by comprising a wire wheel (12) and a substrate (16), wherein a molten pool (17) is formed after the surface of the substrate (16) is electrified, a metal welding wire (11) is sent into the molten pool (17) through an internal channel of a hollow electrode (8) of a hollow electrode welding and arc striking device by the wire wheel (12) to be melted and accumulated, the hollow electrode (8) is connected with an inert gas protection device through an argon protection cover (5), the inert gas protection device can form an inert gas environment to isolate the molten pool (17) from air, and metal additive manufacturing is realized by the fact that the substrate (16) moves in a plane.
2. Hollow electrode wire feed arc additive manufacturing system according to claim 1, characterized in that one end of the metal welding wire (11) is connected to the wire wheel (12) and the other end passes between the first wire feed wheel (9) and the second wire feed wheel (10) into the hollow electrode (8), the first wire feed wheel (9) and the second wire feed wheel (10) being arranged directly above the hollow electrode welding arc starting device.
3. The hollow electrode wire-feeding electric arc additive manufacturing system according to claim 1, wherein the hollow electrode (8) is vertically arranged in the argon gas protection cover (5), and the circulating flow passage (7) and the hollow electrode clamping sleeve (6) are sequentially arranged between the hollow electrode (8) and the argon gas protection cover (5).
4. The hollow electrode wire feed arc additive manufacturing system according to claim 3, wherein the hollow electrode clamping sleeve (6) and the hollow electrode (8) are connected by interference fit.
5. The hollow electrode wire feed arc additive manufacturing system according to claim 1, wherein the hollow electrode (8) is connected to a positive pole of a welder (14) through a hollow electrode lead (13), and a negative pole of the welder (14) is connected to a substrate (16) through a substrate lead (15).
6. The hollow-electrode wire-feed arc additive manufacturing system according to claim 1, wherein the inert gas shielding device comprises an argon tank (1), and the argon tank (1) is connected with an argon shield (5) through an argon pipe (4).
7. The hollow-electrode wire-feed arc additive manufacturing system according to claim 6, wherein an on-off valve (3) is provided between the argon tank (1) and the argon pipe (4).
8. The hollow electrode wire feed arc additive manufacturing system according to claim 6, wherein a pressure gauge (2) is provided on the argon tank (1).
9. The operating method of the hollow electrode wire feeding electric arc additive manufacturing system according to claim 1, wherein the inert gas protection device is operated to introduce argon gas into the hollow electrode at a speed of 15-20L/min, and power is supplied to form a plasma arc between the hollow electrode and the substrate, so as to form a molten pool on the surface of the substrate; feeding a metal welding wire into a molten pool at a wire feeding speed of 2-5 m/min for melting, and forming gas protection on the metal welding wire fed into the hollow electrode and a local area on the surface of the molten pool by the introduced argon; and moving the substrate, and forming a metal part stacked layer by layer after the molten pool is cooled and solidified.
10. The method of claim 9, wherein after the metal additive manufacturing is completed, the hollow electrode welding arc starting device is turned off, then the additive manufacturing device is turned off, and finally the inert gas protection device is turned off.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116287744A (en) * | 2023-05-23 | 2023-06-23 | 苏州集萃高合材料科技有限公司 | Super-large-specification high-temperature alloy and preparation method thereof |
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Application publication date: 20210727 |