CN113909632A - Material increasing device and process method of cold crack control robot for ultrahigh-strength steel large-scale component - Google Patents
Material increasing device and process method of cold crack control robot for ultrahigh-strength steel large-scale component Download PDFInfo
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- 229910000797 Ultra-high-strength steel Inorganic materials 0.000 title claims abstract description 106
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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
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25J—MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
- B25J11/00—Manipulators not otherwise provided for
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25J—MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
- B25J9/00—Programme-controlled manipulators
- B25J9/0081—Programme-controlled manipulators with master teach-in means
Abstract
The invention discloses a device and a process method for generating cold crack defects of a large ultrahigh-strength steel component after electric arc additive manufacturing. According to the invention, a stainless steel filament is added on the ultrahigh-strength steel double-wire MIG material-increasing robot device; the stainless steel filament is used as filling metal and is arranged between the two ultrahigh-strength steel wire rods, and a distance is formed between the stainless steel filament and the ultrahigh-strength steel wire rods. The invention utilizes the heat radiation of two electrodes and the arc heat to melt the stainless steel filament to obtain a molten pool with the interlayer characteristics of ultra-high strength steel-stainless steel-ultra-high strength steel. According to the invention, the stainless steel has high capacity of resisting plastic deformation and fracture, and the cold cracks of the ultrahigh-strength steel large member are relieved or eliminated through deformation, so that the ultrahigh-strength steel large member with excellent forming quality is finally obtained.
Description
Technical Field
The invention belongs to the technical field of electric arc additive manufacturing, and particularly relates to an additive device of a cold crack control robot for a large ultra-high-strength steel component and a process method.
Background
The ultrahigh-strength steel is a kind of steel which is based on high-strength steel, further adjusts alloy elements and improves the process, increases the contents of carbon and alloy elements in the steel, and enables the yield strength to reach more than 1380MPa and the tensile strength to reach more than 1500 MPa. The ultrahigh strength steel can be divided into three categories according to different alloy element contents and service performances: low-alloy ultrahigh-strength steel, medium-alloy ultrahigh-strength steel and high-alloy ultrahigh-strength steel. The ultrahigh-strength steel is widely applied to large-scale engineering machinery structural units and large-scale components due to the characteristic of high strength of the ultrahigh-strength steel. In some key fields representing high and new technologies and novel material application, for example, steel for aircraft landing gear, high-end bearing steel, steel for high-pressure plunger pumps, high-strength stainless steel for rocket engines and the like all belong to ultrahigh-strength steel, but the steel is unstable in domestic production technology and quality control at present, and can have the problems of non-metal inclusion, frequent occurrence of cold cracks, short service life and the like, so that the use of the steel is severely limited. For example, after two ultrahigh-strength steel wires with high strength and high hardness are adopted to carry out ultrahigh-strength steel twin-wire MIG material increase on a large-scale member, the member is easy to have cold cracks due to overlarge internal stress.
The Chinese patent with the application number of 202010674689.1 discloses a process method for solving the crack of a high-strength steel casting blank, relates to high-strength steel with the tensile strength of more than 950MPa and a casting blank production process thereof, and aims to solve the cracking problem of the casting blank before the casting blank is put into a heating furnace, but does not meet the requirement that the tensile strength is more than 1500 MPa. The Chinese patent with the application number of 2013104268522 discloses a quenched and tempered high-strength low-welding crack sensitivity steel plate for 600 MPa-level hydroelectric engineering and a preparation method thereof, wherein the steel plate is prepared from the following components in percentage by mass: c: 0.07 to 0.09%, Si: 0.20 to 0.40%, Mn: 1.50-1.60%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, Mo: 0.12 to 0.25%, Nb: 0.027-0.050%, Ni: 0.15 to 0.30 percent,v: 0.035 to 0.060%, Ti: 0.010-0.020%, Alt: 0.020-0.050%, the balance of Fe and inevitable impurities, the carbon equivalent CE is controlled to be less than or equal to 0.42%, and the welding crack sensitivity index PcmLess than or equal to 0.20 percent. The method only prepares the high-strength steel low-welding crack sensitivity steel plate from the aspect of element content. In the Chinese patent with the application number of 201010125985.2, from the angle of the shape of a welding seam, a T-shaped joint is designed to ensure that cold cracks are few to occur in an ultrahigh-strength steel structure bearing tensile and bending moment loads, and the enough static load bearing capacity can be ensured. The design method does not solve the problem of the cold cracking of the ultrahigh-strength steel from the perspective of the forming process. The Chinese patent with the application number of 201010188996.5 relates to an MAG welding method for butting quenched low-alloy ultrahigh-strength steel and high-quality carbon structural steel, and aims to solve the problem of poor weldability of quenched ultrahigh-strength steel. However, the MAG welding method belongs to semi-automatic welding and has low welding efficiency. The quenching heat treatment process is not beneficial to simplifying the welding process and improving the labor condition.
As described above, in the prior art relating to the ultra high strength steel, the problem of cracking of the ultra high strength steel large member is not solved. Therefore, in order to control and eliminate the cold cracks in the ultrahigh-strength steel and improve the forming quality of the ultrahigh-strength steel, a robot material increasing device and a process method for controlling the cold cracks of the ultrahigh-strength steel large-scale component are urgently needed.
Disclosure of Invention
In order to further solve the cold crack problem of the ultrahigh-strength steel large-scale component, improve the stability of the material increase process and obtain the high-efficiency and high-quality large-scale material increase component, a material increase device and a material increase process method of the ultrahigh-strength steel large-scale component cold crack control robot are urgently needed.
On the basis of ultrahigh-strength steel double-wire MIG material increase, the invention introduces a stainless steel wire and an external special material increase gun, integrates the technologies of a digital material increase power supply, an industrial robot, double-gun different wires and the like into a robot workstation, solves the cracking problem of a large-scale component, and enables the material increase process to be more efficient and high-quality. The specific technical scheme is as follows:
the cold crack control robot material increase device for the ultra-high strength steel large-scale component comprises a material increase power supply, a wire feeding system, a special material increase gun, a robot control system and a water and gas supply system.
The material increase power supply comprises two pulse material increase power supplies; the wire feeding system comprises three four-wheel drive wire feeders, two ultrahigh-strength steel wire discs and a stainless steel wire disc; the robot control system mainly comprises a robot, a control cabinet and a demonstrator;
the special gun for additive comprises a double-wire special gun for additive and an external special gun for additive; the water and gas supply system comprises two gas cylinders and two water tanks which are arranged in the material increase power supply.
The process method comprises the following steps: argon-oxygen-nitrogen mixed gas is used as protective gas, and the ultra-high strength steel double wires which are mutually independent are conveyed to the upper part of the component by a double-wire additive special gun under the driving of a wire feeder, and the double wires are used as electrodes and filling metal; the third stainless steel wire is conveyed to the upper part of the component by an external additive special gun under the drive of a wire feeder and is used as a filling metal between the two ultrahigh-strength steel wires; adjusting the distance between the ultrahigh-strength steel wire and the stainless steel wire, connecting a material increase power supply, and arcing between the ultrahigh-strength steel wire and the joint of the component to form a molten pool. Meanwhile, the stainless steel wire begins to melt after being subjected to the heat radiation and the arc heat of the ultrahigh-strength steel wire material, and gradually drops into a molten pool. The formed molten pool is in the interlayer characteristic of 'ultrahigh strength steel-stainless steel-ultrahigh strength steel', and a component is formed after cooling and solidification.
In the internal structure of the component joint formed by the invention, metastable residual austenite in the stainless steel is transformed into martensite by the TRIP effect, and the internal stress of the ultrahigh-strength steel is continuously transferred to the untransformed austenite and generates new martensite, so that the stress is not easy to concentrate, and the generation and propagation of cold cracks are delayed. Stainless steel is relatively soft and has relatively high resistance to plastic deformation and fracture. The ultrahigh-strength steel has high strength and hardness, poor plastic toughness and low deformation resistance. The stainless steel and the ultrahigh-strength steel are combined, the advantages of soft-hard materials can be integrated, and the internal stress of the ultrahigh-strength steel component is relieved or eliminated by utilizing the deformation of the stainless steel, so that the cold cracks of the ultrahigh-strength steel component are controlled. The adoption of the material increase mode of ultra-high strength steel-stainless steel-ultra-high strength steel can improve the hardenability of the ultra-high strength steel, reduce the residual stress in the steel and be beneficial to eliminating the internal defects of the member joint. The stainless steel is positioned in the middle of the ultrahigh-strength steel and is used as a bridge for connecting two ultrahigh-strength steel wires, so that the integrity and stability of a molten pool in the material increasing process are ensured.
Research shows that cold cracks are all visible in a hydrogen-rich zone, and hydrogen has very important influence on the cold cracks. Under the high temperature of welding, a large amount of hydrogen is dissolved in the molten pool. Since the main component in the bath is austenite, the solubility of hydrogen is relatively high. Whereas during the subsequent cooling and solidification the austenite phase changes to ferrite causing a drastic decrease in the solubility of hydrogen. At which point the hydrogen escapes very strongly. However, because of the rapid cooling rate, the hydrogen has no time to escape and remains in the weld metal, so that the hydrogen is supersaturated therein. When the concentration of hydrogen is sufficiently high, cold cracking will occur. The invention adopts the additive mode of 'ultrahigh strength steel-stainless steel-ultrahigh strength steel' and utilizes the characteristic of low hydrogen content of stainless steel to reduce the generation of 'hydrogen-rich zone' of a member joint, thereby controlling the cold cracks of the ultrahigh strength steel large member.
The additive material power supply specifically comprises a first pulse power supply and a second pulse power supply, wherein the two power supplies are connected through an LHSB (high speed bus) and cooperatively controlled, and can be communicated with each other. The phase control of the electric arc generated by the ultra-high strength steel is achieved through pulse phase control.
The wire feeding system comprises three four-wheel drive wire feeders, two ultrahigh-strength steel wire discs, a stainless steel wire disc and a hose. The two four-wheel drive wire feeders respectively drive wires of the two ultrahigh-strength steel wire discs to the dual-wire additive special gun; the two ultrahigh-strength steel wires have equal diameters and same chemical components and element contents so as to ensure the stability in the material increasing process; the introduced stainless steel wire is positioned in the stainless steel wire disc and is conveyed to the external additive special gun under the driving of the wire feeder.
The robot control system comprises a robot, a control cabinet, a demonstrator and the like. The robot arm is provided with a double-wire additive special gun. A detachable hoop is designed at the general point of the robot, and the hoop is connected with an external wire feeding arm to control the operation of the external additive special gun. The arrangement of the internal devices of the control cabinet is simple and clear, all the devices adopt a bus form, and the control cabinet is convenient and reliable to maintain. The control cabinet controls the working process through the demonstrator, the control plate matched with the robot is accurate, the working period can be greatly reduced, and the production efficiency is improved. The method comprises the following specific additive preparation steps: firstly, wire materials and the diameter of the wire materials are selected on the additive control panel, then the working mode of the additive power supply is selected, then the proper additive current and voltage are automatically matched by adjusting the wire feeding speed, and finally the current and voltage of the additive power supply can be finely adjusted in a small range by utilizing an arc length correction mode.
The water and gas supply system comprises two gas cylinders and two water tanks arranged in the material increase power supply, and can meet the requirements of equipment.
Compared with the prior art, the invention has the following remarkable advantages:
1. the invention utilizes automatic robot equipment, thereby leading the device to be convenient to operate and easy to control, and greatly improving the productivity;
2. the invention utilizes the characteristic that the stainless steel has high plastic deformation resistance to cause deformation so as to relieve or eliminate cold cracks of the large-scale ultrahigh-strength steel component;
3. the stainless steel filament added in the invention is not connected with a material adding power supply, but is melted in the ultrahigh-strength steel filament as an adding filament, so that the problem of insufficient deposition amount in the formation of a molten pool is solved;
4. the invention adopts an external additive special gun and a four-wheel drive wire feeder, thereby introducing stainless steel filaments to realize electric arc additive of dissimilar wire materials; by assembling the external additive special gun, a three-wire two-power supply system is obtained, high metal deposition amount under low heat input is realized, and the efficiency of electric arc additive manufacturing is improved.
Drawings
Fig. 1 is a schematic structural diagram of a cold crack control robot additive device for an ultra-high-strength steel large-scale component according to an embodiment of the invention.
Fig. 2 is an additive material arrangement diagram of two ultra-high strength steel wires and one stainless steel wire according to an embodiment of the invention.
The automatic wire feeding device comprises a gas cylinder 1, a control cabinet 2, a material increase power supply 3, an ultrahigh-strength steel wire disc 4, a four-wheel drive wire feeder 5, an industrial robot 6, a double-wire material increase special gun 7, a connecting rod 8, a mounting plate 9, a stainless steel wire disc 10, a hose 11, a hoop 12, an external wire feeding arm 13, an external material increase special gun 14, a component 15 and a workbench 16.
Detailed Description
The invention will be further explained with reference to the drawings
The invention provides a cold crack control robot additive device and a process method for a large ultra-high-strength steel component, wherein the device comprises a gas cylinder 1, a control cabinet 2, an additive power supply 3, a wire disc 4, a four-wheel drive wire feeder 5, an industrial robot 6, a double-wire additive special gun 7, a connecting rod 8, an installation plate 9, a stainless steel wire disc 10, a hose 11, a hoop 12, an external wire feeding arm 13, an external additive special gun 14 and a workbench 16. The device concentrates the external additive special gun 14 in the same device, adds a stainless steel filament, and utilizes the high plastic deformation resistance and low hydrogen content of the stainless steel to deform the stainless steel to relieve or eliminate cold cracks of large-scale components of the ultrahigh-strength steel. The stainless steel filaments are added, so that the wire cladding rate can be greatly improved under the condition of ensuring low heat input, and the efficiency of electric arc additive manufacturing is improved.
In order to understand the technical solutions more specifically, the technical solutions will be described in detail below with reference to the drawings and specific embodiments of the specification.
Referring to the attached drawings 1 and 2, the invention provides a cold crack control robot material increase device and a process method for an ultra-high-strength steel large member, which specifically comprise the following steps:
the additive power supply 3 specifically includes a first pulse power supply and a second pulse power supply, and the two power supplies are connected and cooperatively controlled by an LHSB (high speed bus) and can communicate with each other. The phase control of the electric arc generated by the ultra-high strength steel is achieved through pulse phase control. In the material increase process, the two ultrahigh-strength steel wires are connected and cooperatively controlled through an LHSB high-speed bus, and arc striking and arc extinguishing are respectively carried out on the two ultrahigh-strength steel wires in an uninterrupted and alternate manner. And the stainless steel filaments can be melted by the heat radiation and the arc heat of the electrode, so that the aim of improving the cladding rate of the filaments under the condition of the same heat input is fulfilled.
The wire feeding system comprises three four-wheel drive wire feeders 5, two ultrahigh-strength steel wire discs 4, a stainless steel wire disc 10 and a hose 11. The two four-wheel drive wire feeders respectively drive wires of the two ultrahigh-strength steel wire discs 4 to the double-wire additive special gun 7; the two ultrahigh-strength steel wires have equal diameters and same chemical components and element contents so as to ensure the stability in the material increasing process; the introduced stainless steel wire is positioned in a stainless steel wire coil 10 and is driven by a wire feeder to be sent to a nozzle of an external additive special gun 14 through a hose 11. The stainless steel wire plate 10 is positioned at the mounting plate 9, so that the occupied space can be saved. The connecting rod 8 connects the industrial robot 6 with the mounting plate 9, and the matching is reasonable.
The robot control system comprises an industrial robot 6, a control cabinet 2, a demonstrator and the like. The arm of the industrial robot 6 is provided with a double-wire additive special gun 7. A detachable yoke 12 is designed at the general point of the robot. Bolts connect the yoke 12 to an external wire feed arm 13 to govern operation of an external additive gun 14. The placement of the external additive special gun 14 can be adjusted according to the position of the ultrahigh-strength steel wire, so that the distance between the ultrahigh-strength steel wire and the stainless steel filament can be controlled. The arrangement of the devices in the control cabinet 2 is simple and clear, all the devices adopt a bus form, and the maintenance is convenient and reliable. The control cabinet 2 controls the working process through the demonstrator, the control plate matched with the robot is accurate, the working period can be greatly reduced, and the production efficiency is improved.
In the process of material increase of the ultrahigh-strength steel member, a molten pool formed by three wires is shown in figure 2, the center of a concentric circle of a third ultrahigh-strength steel wire is taken as an origin O, a material increase track is taken as an x axis, a straight line connecting the three centers of circles is taken as a y axis, and the three wires are respectively melted to obtain a first molten pool, a second molten pool and a third molten pool after material increase is performed by a special material increase gun along the track; the x axis is coincident with the central line of the third molten pool, the distance d1 between the first ultrahigh-strength steel wire and the second stainless steel filament, and the distance d2 between the second stainless steel filament and the third ultrahigh-strength steel wire. And adjusting the placing position of the external additive special gun 14, and controlling the distance between the second stainless steel filament and the two pieces of ultrahigh-strength steel, so as to obtain the sizes of d1 and d 2. As shown in FIG. 2.1, when the distance d1+ d2 between two pieces of ultra-high strength steel is small and is about 7-10 mm, a large molten pool is formed after one additive process. And the width of the additive joint obtained after the large molten pool is cooled and solidified is about 7-10 mm. When the distances d1 and d2 between the additive wires are larger as shown in fig. 2.2, the second stainless steel filament overlaps the first molten pool and the second molten pool, so that the track width after one additive wire is enlarged to be about 11-14 mm. At the moment, the two parts and the three parts of the molten pool are tightly combined, the formed track width is improved by 1-4 mm in a smaller way than the distance d1+ d2, and the material increase efficiency is favorably improved.
The technical process of the specific embodiment of the invention comprises the following steps:
the surface of a 316L substrate is pretreated, impurities and oxide scales on the surface of the substrate are removed by alcohol, a grinding machine, an electric hair drier and the like, and uncertain factors of a test are reduced; the chemical composition of the substrate is shown in Table 1, and the size is 1000mm multiplied by 600mm multiplied by 60 mm; in the example, 316L stainless steel filaments are used as the additive wire material, the diameter is 0.8mm, the chemical composition is shown in table 2, 18Ni (350) ultrahigh-strength steel wire material is used for material increase, the diameter is 1.2mm, and the chemical composition is shown in table 3;
the cylinder valve was unscrewed and a shielding gas of Ar + 1.5% O was introduced2+5％N2The mixed gas of (3);
switching on a power supply, adopting a MIG + P process mode, presetting additive manufacturing process parameters as shown in table 4, wherein the additive manufacturing process parameters comprise current voltage 23.0V, additive current 164A, wire feeding speed 5m/min, additive speed 5mm/s and air flow 25L/min;
editing a material adding path by using a software system in advance, ensuring that the library card KR16 robot normally runs in the walking process, and then moving to a safe position for standby;
assembling an external additive special gun on a Kuka KR16 robot by using a hoop, and adjusting the positions of three additive special guns to obtain a proper distance between a 316L stainless steel filament and an 18Ni (350) ultrahigh-strength steel wire;
a servo start switch is adopted, the wire feeder stably feeds wires at the speed of 5m/min, the gas cylinder smoothly feeds gas, and a circulating water path circulates;
starting the additive test, driving the additive special gun to a specified position by the industrial robot, and arcing and additive machining between the ultrahigh-strength steel wire and the 316L substrate joint;
after the material increase is finished, the industrial robot moves to a working original point;
closing the material increase power switch and closing the gas cylinder valve;
finally obtaining the component with the interlayer characteristics of 'high-strength steel-stainless steel-ultrahigh-strength steel', and meeting the requirement of controlling cold cracks.
TABLE 1316L substrate chemical composition TABLE (wt%)
TABLE 318 Ni (350) chemical composition TABLE (wt%) for ultra-high strength steel wire
Table 4 table of process parameters used in the examples
Claims (7)
1. A cold crack control robot material increase process method for a large ultra-high strength steel component is characterized in that argon-oxygen-nitrogen mixed gas is used as protective gas, ultra-high strength steel double wires which are mutually independent are conveyed to the upper part of the component through a double-wire material increase special gun under the driving of a wire feeder, and the double wires are used as electrodes and filling metal; arranging a third stainless steel wire between the two ultrahigh-strength steel wires as a filler metal in a wire feeder; adjusting the distance between the ultrahigh-strength steel wire and the stainless steel wire, connecting a material increase power supply, and arcing between the ultrahigh-strength steel wire and the joint of the component to form a molten pool; the stainless steel wire begins to melt after being subjected to the heat radiation and the electric arc heat of the ultrahigh-strength steel wire material, and gradually drops into a molten pool; the formed molten pool is in the interlayer characteristic of 'ultrahigh strength steel-stainless steel-ultrahigh strength steel', and a component is formed after cooling and solidification; the ultrahigh-strength steel is used as a medium-hard part of a large member and is used for bearing; and stainless steel is used as a soft part in a large component and is used for bearing all deformation in the material increasing process.
2. The cold crack control robot additive process method for the large ultrahigh-strength steel component according to claim 1, wherein the two ultrahigh-strength steel wires have the same diameter and the same chemical components and element content, and are used for ensuring the stability in the additive process.
3. The cold crack control robot additive process method for the large ultrahigh-strength steel component according to claim 1, wherein in the additive process of the ultrahigh-strength steel component, a molten pool formed by three wires takes the center of a concentric circle of a third ultrahigh-strength steel wire as an origin O, an additive track as an x-axis and a straight line connecting the three centers as a y-axis, and three wires are respectively melted to obtain a first molten pool, a second molten pool and a third molten pool after additive special guns are arranged along the tracks for additive; the x axis coincides with the central line of the third molten pool, the distance d1 between the first ultrahigh-strength steel wire and the second stainless steel filament, and the distance d2 between the second stainless steel filament and the third ultrahigh-strength steel wire; the sizes of d1 and d2 are obtained by controlling the distance between the second stainless steel filament and the two pieces of ultrahigh-strength steel.
4. The cold crack control robot additive process method for the large ultra-high strength steel component as claimed in claim 3, wherein when the distance d1+ d2 between two pieces of ultra-high strength steel is small and about 7-10 mm, a large molten pool is formed after one additive process.
5. The cold crack control robot additive process method for the large-scale ultrahigh-strength steel component as claimed in claim 3, wherein when the distances d1 and d2 between the additive wires are large, the second stainless steel filament overlaps the first molten pool and the second molten pool, so that the track width after one additive is enlarged to about 11-14 mm.
6. A cold crack control robot material increase device for a large ultra-high-strength steel component is characterized by comprising a material increase power supply, a wire feeding system, a special material increase gun, a robot control system and a water and gas supply system;
the additive material power supply specifically comprises a first pulse power supply and a second pulse power supply, wherein the first pulse power supply and the second pulse power supply are connected through the LHSB and cooperatively controlled and can be communicated with each other; the phase control of the electric arc generated by the ultra-high strength steel is achieved through pulse phase control; the wire feeding system comprises three four-wheel drive wire feeders, two ultrahigh-strength steel wire discs, a stainless steel wire disc and a hose; the two four-wheel drive wire feeders respectively drive the ultrahigh-strength steel wires of the two wire discs to the dual-wire additive special gun; one introduced stainless steel wire is positioned in the stainless steel wire disc and is driven by the wire feeder to be sent to an external additive special gun;
the robot control system mainly comprises a robot, a control cabinet and a demonstrator; the robot arm is provided with a dual-wire additive special gun; a detachable hoop is designed at the total point of the robot, and the hoop is connected with an external wire feeding arm to control the operation of an external additive special gun;
the internal devices of the control cabinet adopt a bus form; the control cabinet controls the working process through the demonstrator.
7. The cold crack control robot additive device for the ultrahigh-strength steel large-scale component as claimed in claim 6, wherein the water and gas supply system comprises two gas cylinders and two water tanks built in the additive power supply, and can meet the requirements on equipment.
Priority Applications (1)
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