CN114406417A - Rotary arc GTA additive manufacturing system and method based on non-axisymmetric tungsten electrode - Google Patents
Rotary arc GTA additive manufacturing system and method based on non-axisymmetric tungsten electrode Download PDFInfo
- Publication number
- CN114406417A CN114406417A CN202210194007.6A CN202210194007A CN114406417A CN 114406417 A CN114406417 A CN 114406417A CN 202210194007 A CN202210194007 A CN 202210194007A CN 114406417 A CN114406417 A CN 114406417A
- Authority
- CN
- China
- Prior art keywords
- arc
- welding gun
- welding
- additive manufacturing
- tungsten electrode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
-
- 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
-
- 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
- B23K9/325—Devices for supplying or evacuating shielding gas
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Arc Welding In General (AREA)
Abstract
The invention relates to a rotary arc GTA additive manufacturing system and method based on a non-axisymmetric tungsten electrode, belonging to the technical field of metal additive manufacturing and comprising an argon arc welding power supply, a rotary arc GTAW welding gun, a welding robot and a wire feeding device; the rotary arc GTAW welding gun comprises a welding gun shell, a rotary motor, a central rotating shaft, a non-axisymmetric tungsten electrode, a conductive system and an air supply system, wherein the air supply system comprises a main shielding gas structure and an auxiliary shielding gas structure, the main shielding gas is introduced from the top of the welding gun, an auxiliary port is formed in the lower part of the welding gun, the auxiliary shielding gas is introduced from the lower part of the welding gun to enhance the gas pressure in the gun body, a wire feeding device is mechanically connected with the rotary arc GTAW welding gun, and the wire feeding device is matched with an argon arc welding power supply; the method can effectively increase the width of a molten pool, reduce heat input, simultaneously realize metal deposition of high electrical parameters so as to improve the efficiency of additive manufacturing, and realize rapid molding of large parts.
Description
Technical Field
The invention relates to a rotating arc GTA additive manufacturing system and method based on a non-axisymmetric tungsten electrode, and belongs to the technical field of metal additive manufacturing.
Background
Additive manufacturing technology is a new material manufacturing technology that utilizes the principle of discrete-build-up, welding technology, computer aided design, etc. Compared with the traditional material processing technology such as forging, machining and welding, the method has the advantages of no need of a cutter and a grinding tool, high utilization rate of raw materials, short production period and realization of a complex structure.
Laser and electron beam additive manufacturing can manufacture structural members with complex shapes, but the corresponding cost is too high, the energy consumption is higher, the deposition speed is lower, and the laser and electron beam additive manufacturing is not suitable for manufacturing large structural members. In the conventional arc metal manufacturing technology, heat accumulation is serious along with the increase of the number of cladding layers during production and manufacturing, the high-temperature retention time of a molten pool is too long, the produced workpiece is deformed, and the structure performance is weakened. At present, the Cold Metal Transition (CMT) technology is mainly used for the electric arc additive manufacturing, but the corresponding equipment is expensive and cannot be applied to a wide range. The electric arc additive manufacturing technology of tungsten inert gas welding (GTAW) has the characteristics of low equipment price, low welding heat input, good welding forming, uniform microstructure, excellent mechanical property and the like. However, conventional GTAW welding has low efficiency, poor controllability of electric arc, and narrow molten pool width, and still cannot realize rapid forming of large parts.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a rotary arc GTA additive manufacturing method based on a non-axisymmetric tungsten electrode, which can effectively increase the width of a molten pool, reduce heat input, simultaneously realize metal deposition of high electric parameters so as to improve the additive manufacturing efficiency and realize the rapid molding of large parts.
The technical scheme of the invention is as follows:
a rotary arc GTA additive manufacturing system based on non-axisymmetric tungsten electrodes comprises an argon arc welding power supply, a rotary arc GTAW welding gun, a welding robot and a wire feeding device;
the rotary arc GTAW welding gun comprises a welding gun shell, a rotary motor, a central rotating shaft, a non-axisymmetric tungsten electrode, a conductive system and an air supply system, wherein the rotary motor is connected with the non-axisymmetric tungsten electrode through the central rotating shaft, and the conductive system is used for being connected with an argon arc welding power supply and supplying power; the gas supply system is used for supplying shielding gas to the interior of the welding gun; the gas supply system comprises a main protection gas circuit and an auxiliary protection gas circuit, the main protection gas circuit is introduced from the top of the welding gun, the gas chamber in the welding gun body is filled with the protection gas, the lower part of the welding gun is provided with an auxiliary port, the auxiliary protection gas circuit is introduced from the lower part of the welding gun, the gas pressure in the welding gun body is enhanced, and the gas flow of the protection gas is properly increased, so that the protection effect of the protection gas on a molten pool is improved;
the rotary arc GTAW welding gun is fixed on the welding robot, the welding robot drives the rotary arc GTAW welding gun to move, and the wire feeding device is always positioned in the advancing direction of the welding gun in the moving process so as to ensure the material increase quality;
the wire feeding device is mechanically connected with a rotary arc GTAW welding gun, and is matched with an argon arc welding power supply to realize adjustment of wire feeding parameters in the material increase process;
preferably, in order to increase the area of the rotating arc, the tip of the non-axisymmetric tungsten electrode is an inclined plane, and the inclined angle of the inclined plane is 35-50 degrees.
The axisymmetric tip of the tungsten electrode is changed into a non-axisymmetric platform, the tungsten electrode is rotated, the arc pressure is dispersed, the molten pool is spread to increase the fusion width,
through one-step optimization, in order to increase the stability of electric arc, the burning area of electric arc and slow down the burning loss degree of tungsten utmost point, non-axisymmetric tungsten utmost point inclined plane tip level is equipped with blunt face platform, and the platform width is 1 ~ 1.5 mm.
Preferably, for avoiding damage to industrial robot and welding power supply when rotating arc GTAW welder high frequency striking, simultaneously for lightening the rifle body weight, welder upper portion adopts wooden material, and keeps apart with conducting rubber at welder and industrial robot contact department.
Preferably, a welding gun bottom support cover is arranged below the rotary arc GTAW welding gun and comprises a circular table portion and a cylindrical portion, the circular table portion is connected with the rotary arc GTAW welding gun, a ceramic nozzle is connected and arranged on the inner side of the cylindrical portion, a non-axisymmetric tungsten electrode penetrates through the ceramic nozzle, and a three-hole exhaust port is formed between the welding gun bottom support cover and the ceramic nozzle.
Further preferably, the angle difference between the three-hole exhaust ports is 60 degrees, the three-hole exhaust ports are divided into a rear side hole and two side holes according to the arrangement mode, in the additive manufacturing process, the rear side hole is always located right above the deposited metal and mainly has a rear protection effect on the deposited metal, and the two side holes are located on two sides of the deposited metal and mainly protect the two sides of the deposited metal.
Preferably, wire feeding unit adopts two to send a silk pipe including two silks, and two silks send a silk pipe cross-section to be oval, and interior two circular passageways that have side by side are like nose structure, and circular passageway is used for placing the wire, and this kind of structure can realize quick switching monofilament-two silks and send a mode, increases two stability of sending a silk, is showing and improves metal deposition efficiency, also can realize the vibration material disk of dissimilar metal simultaneously.
In the prior art, the double wire feeding angles are arranged on the same side and on both sides, but the invention is used for feeding wires in the same direction and is provided with a unique wire feeding device. The conventional arrangement is that dissimilar metals are mixed by adjusting the wire feeding angle, and another wire feeding mechanism needs to be additionally assembled into the additive equipment, so that the equipment is dispersed and is not beneficial to the integration of the equipment; the invention can realize good mixing of dissimilar metals by utilizing the rotary electric arc stirring molten pool, and the equipment is integrated into a whole; the wire feeding pipe with the trunk structure is used for feeding wires at the same side, so that the molten drop is more stable in transition to a molten pool; in the process of heating wire, if an independent double-wire system is adopted, two sets of heating wire power supplies are needed, and only one set of heating wire power supply is needed by adopting the structure; in the GTA electric arc vibration material disk process, need let send the silk pipe to be located the welder front side all the time, compare in the two silk pipes that send that conventional setting, this structure makes welder attitude adjustment in vibration material disk complicated component more convenient.
Further preferably, the electric heating wire resistance device is added on the wire feeding pipe, so that the metal deposition efficiency can be improved, the heat input can be effectively reduced, the thermal deformation of deposited metal in the electric arc additive manufacturing process can be obviously improved, and the additive manufacturing precision can be improved. Firstly, the welding wire is heated to a temperature close to melting temperature by using another power supply (hot wire power supply) independent of a welding power supply, so that the melting speed of the filling wire is greatly increased, and the metal deposition rate is improved; secondly, after the hot wire device is added, the dilution ratio of the base material is reduced, and the welding heat input is adjusted.
An additive manufacturing method using the non-axisymmetric tungsten electrode-based rotating arc GTA additive manufacturing system comprises the following steps:
(1) arranging a substrate before material increase, fixing the substrate by using a tool clamp, polishing the surface of the substrate and cleaning the surface of the substrate by using alcohol to remove rust and oil dirt; polishing the bottom of a tungsten electrode into a shape of an inclined conical surface with a platform;
(2) starting the welding robot, programming the additive path, then performing teaching programming, and enabling the wire feeding pipe to be located in the advancing direction of the welding gun all the time in the programming process; setting the tungsten electrode height to a constant value; adjusting the walking speed of a welding gun in the material increase process; after programming, idle walking is carried out to ensure that the path is error-free; starting an argon arc welding power supply, adjusting a welding machine to be in a constant current mode, setting electrical parameters, starting main shielding gas and auxiliary shielding gas 5s in advance, and stopping the auxiliary shielding gas 5s in a delayed manner; setting the wire feeding speed of the wire feeding device, synchronizing walking and wire feeding, and drawing wires in advance;
(3) adjusting corresponding parameters, and starting a rotating motor to enable the non-axisymmetric tungsten electrode to start rotating; and performing high-frequency arc striking and material increase.
Preferably, in step (1), a tungsten electrode with a diameter of 3.0mm is used, and a 45-degree inclined surface with a platform with a width of 1mm is processed at the bottom of the tungsten electrode.
Preferably, in the step (2), the rotating speed of the tungsten electrode is 300rpm, the height of the tungsten electrode is 3mm, the walking speed of the welding gun is 30cm/min, and the current is 170A; the flow of the main protective gas is 15L/min, and the flow of the auxiliary protective gas is 8L/min; when the single wire is fed, the single wire feeding speed is 240-.
Preferably, in the step (2), double-wire feeding is adopted to improve the material increase efficiency and the material increase width, and the wire feeder is controlled by a PLC (programmable logic controller) to synchronously feed wires so as to ensure the wire feeding speed to be consistent; the wire feeding speed of the double-wire feeding mode is 200-240 cm/min.
Compared with the conventional GTA electric arc additive manufacturing, the double-gas supply device is adopted, and the flow rates of the double-gas supply device and the GTA electric arc additive manufacturing need to be matched with each other during a process experiment; compared with the hump defect generated by high electrical parameters in conventional GTA arc additive manufacturing, the additive manufacturing of the high electrical parameters can be realized by the rotating arc due to the dispersion of the arc pressure, and the deposition process is stable.
The invention has the beneficial effects that:
1. according to the technical scheme, the rotary arc GTAW is adopted for additive manufacturing, compared with the traditional GTAW, the heat input is further reduced, the welding deformation is improved, the width of a molten pool is increased, the additive efficiency is improved, the additive structure is finer, and the performance of a workpiece is effectively improved.
2. According to the technical scheme, material increase is realized through the electric arc generated by rotating the tungsten electrode, and in the material increase process, due to the periodic rotation of the rotating electric arc, proper electric arc pressure is applied to two sides of a molten pool, so that the tissues of the two sides are more compact, and the mechanical property and the roughness of the side wall of the workpiece are effectively improved.
3. According to the technical scheme, the protection effect on the molten pool is obviously improved by designing the main protective gas structure and the auxiliary protective gas structure; the ceramic material additive manufacturing device has the advantages that double air supply channels are adopted, inner air supply is a ceramic nozzle, the outer air supply channel adopts a three-hole type exhaust structure, a larger gas protection area is obtained by adopting the ceramic nozzle and the three-hole type exhaust structure, arrangement of air holes is realized, and the problem of side wall oxidation in the material increase process is effectively solved. In the additive manufacturing process, due to the fact that the increased inert gas of the accumulation layer is diffused, and the external active gas is easy to enter a protection range, the protection effect on a molten pool is poor, and therefore the double-gas-supply device is designed to enlarge the protection range, the three-hole type exhaust is designed to increase the airflow stiffness of external protection, and the external active gas is well isolated; the traditional GTA electric arc additive manufacturing only adopts a ceramic nozzle, and the protection range is small. The protection scope is big in this application, and the three pass air current deflection is big, and is better to the isolated effect of outside active gas.
4. According to the technical scheme, the double-wire feeding structure is designed, the wire feeding structure is changed, the trunk-shaped wire feeding hole can realize single wire feeding and double wire feeding, and the wire feeding at the same side ensures the stability of the melting process; meanwhile, the rotating electric arc has a stirring effect on the dissimilar metal additive melting pool, so that the fusion is more sufficient, and the additive efficiency is further improved.
5. According to the technical scheme, the welding gun is driven to move by the welding robot, and the flexible movement of the tungsten electrode in each direction can be accurately and flexibly realized by the control and the positioning of the robot, so that the stable and accurate material increase in the material increase process is ensured.
6. According to the technical scheme, the resistance hot wire device is additionally arranged on the wire feeding device, so that the cladding speed is increased, the electric parameters are reduced, the welding heat input is further reduced, and the deformation of electric arc additive materials is improved.
Drawings
FIG. 1 is a schematic view of an integrated welding system;
FIG. 2 is a schematic front view of a rotating arc GTAW torch;
FIG. 3 is a schematic cross-sectional side view of a rotating arc GTAW torch;
FIG. 4 is a schematic view of a bottom support cover of the welding gun;
FIG. 5 is a schematic view of a twin wire feed tube;
FIG. 6 is a schematic view of a bent section of the tail of the twin-wire feeding tube;
FIG. 7 is an additive shaped coupon view;
FIG. 8a is a view of an additive piece organizer under a rotating arc according to the present invention;
FIG. 8b is a view of an additive piece organizer under a conventional arc;
wherein, 1, a main protection gas circuit; 2. a double-wire feeding pipe; 3. a welding gun clamping device; 4. a welding wire clamping device; 5. a secondary protection gas circuit; 6. a welding gun bottom support cover; 7. an exhaust port; 8. a ceramic nozzle; 9. a non-axisymmetric tungsten electrode; 10. a protective gas wall.
Detailed Description
The present invention will be further described by way of examples, but not limited thereto, with reference to the accompanying drawings.
Example 1:
a non-axisymmetric tungsten electrode-based rotary arc GTA additive manufacturing system is shown in figures 1-3 and comprises an argon arc welding power supply, a rotary arc GTAW welding gun, a welding robot and a wire feeding device;
the rotary arc GTAW welding gun comprises a welding gun shell, a rotary motor, a central rotating shaft, a non-axisymmetric tungsten electrode, a conductive system and an air supply system, wherein the rotary motor is connected with the non-axisymmetric tungsten electrode through the central rotating shaft, and the conductive system is used for being connected with an argon arc welding power supply and supplying power; the gas supply system is used for supplying shielding gas to the interior of the welding gun; the gas supply system comprises a main protective gas circuit 1 and an auxiliary protective gas circuit 5, wherein the main protective gas is introduced from the top of the welding gun to fill a gas chamber in the welding gun body with the protective gas, an auxiliary port is formed in the lower part of the welding gun, the auxiliary protective gas is introduced from the lower part of the welding gun to enhance the gas pressure in the welding gun body and properly increase the gas flow of the protective gas so as to improve the protective effect of the protective gas on a molten pool;
the rotary arc GTAW welding gun is fixed on a welding robot through a welding gun clamping device 3, the welding robot drives the rotary arc GTAW welding gun to move, and a wire feeding device is always positioned in the advancing direction of the welding gun in the moving process to ensure the material increase quality;
the wire feeding device is mechanically connected with a rotary arc GTAW welding gun through a welding wire clamping device 4, and the wire feeding device is matched with an argon arc welding power supply to realize adjustment of wire feeding parameters in the material increase process;
the tip of the non-axisymmetric tungsten electrode is an inclined plane, the inclined angle of the inclined plane is 45 degrees, the end part of the non-axisymmetric tungsten electrode inclined plane is horizontally provided with a blunt surface platform, and the width of the platform is 1 mm.
In order to avoid damage to the industrial robot and a welding power supply during high-frequency arc striking of the rotating arc GTAW welding gun, the upper part of the welding gun is made of a wood material for lightening the weight of the gun body, and the contact part of the welding gun and the industrial robot is isolated by conductive rubber.
A welding gun bottom support cover 6 is arranged below a rotary arc GTAW welding gun and comprises a circular table portion and a cylindrical portion, the circular table portion is connected with the rotary arc GTAW welding gun, a ceramic nozzle 8 is connected to the inner side of the cylindrical portion, a non-axisymmetric tungsten electrode 9 penetrates through the ceramic nozzle, and a three-hole exhaust port is formed between the welding gun bottom support cover and the ceramic nozzle.
The angle difference between the three-hole exhaust ports is 60 degrees, as shown in fig. 4, and the three-hole exhaust ports are divided into a rear side hole and two side holes according to the arrangement mode, in the additive manufacturing process, the rear side hole is always positioned right above the deposited metal and mainly has a rear protection effect on the deposited metal, and the two side holes are positioned on two sides of the deposited metal and mainly protect two sides of the deposited metal.
Wire feeder adopts two silk to send and includes that the double silk send silk pipe 2, the double silk send silk pipe cross-section to be oval, two circular passageways have side by side in, the aperture is 1.4mm, the distance is 2mm between the two passageway centers, it is shown like nose column structure as figure 5, the tail section is crooked as shown in figure 6, circular passageway is used for placing the wire, quick switching monofilament-double silk send the silk mode can be realized to this kind of structure, increase the stability of two silks of sending, show and improve metal deposition efficiency, also can realize the vibration material disk of heterogeneous metal simultaneously.
Example 2:
the structure of the rotary arc GTA material increase manufacturing system based on the non-axisymmetric tungsten electrode is as described in embodiment 1, except that the tip of the non-axisymmetric tungsten electrode is an inclined plane, the inclined angle of the inclined plane is 35 degrees, a blunt surface platform is horizontally arranged at the end part of the inclined plane of the non-axisymmetric tungsten electrode, and the width of the platform is 1 mm.
Example 3:
the structure of the rotary arc GTA material increase manufacturing system based on the non-axisymmetric tungsten electrode is as described in embodiment 1, except that the tip of the non-axisymmetric tungsten electrode is an inclined plane, the inclined plane has an inclination angle of 50 degrees, a blunt surface platform is horizontally arranged at the end part of the inclined plane of the non-axisymmetric tungsten electrode, and the platform width is 1.5 mm.
Example 4:
the structure of the rotary arc GTA additive manufacturing system based on the non-axisymmetric tungsten electrode is as described in embodiment 1, except that an electric heating resistance wire device is added on a wire feeding pipe, so that the efficiency of metal deposition can be improved, the heat input can be effectively reduced, the thermal deformation of deposited metal in the electric arc additive manufacturing process can be obviously improved, and the accuracy of additive manufacturing can be improved. In the material increase process, as uneven heating-cooling of the material increase part can lead to deformation of metal in the material increase process, when a hot wire device is adopted, lower electrical parameters can be selected under the condition of achieving the same material increase efficiency, the generated heat can be reduced, the deformation effect is weakened, and the material increase manufacturing precision is improved.
Example 5:
an additive manufacturing method using the non-axisymmetric tungsten electrode-based rotating arc GTA additive manufacturing system of example 1, comprising the steps of:
(1) arranging a substrate before material increase, fixing the substrate by using a tool clamp, polishing the surface of the substrate and cleaning the surface of the substrate by using alcohol to remove rust and oil dirt; polishing the bottom of a tungsten electrode into a shape of an inclined conical surface with a platform; a tungsten electrode with the diameter of 3.0mm is adopted, and a 45-degree inclined plane with a platform with the width of 1mm is processed at the bottom of the tungsten electrode.
(2) Starting the welding robot, programming the additive path, then performing teaching programming, and enabling the wire feeding pipe to be located in the advancing direction of the welding gun all the time in the programming process; setting the height of the tungsten electrode to a constant value of 3 mm; the rotating speed of the tungsten electrode is 300rpm, and the walking speed of a welding gun in the material increasing process is adjusted to be 30 cm/min; after programming, idle walking is carried out to ensure that the path is error-free; starting an argon arc welding power supply, adjusting a welding machine to be in a constant current mode, setting an electrical parameter current to be 170A, starting main shielding gas and auxiliary shielding gas 5s in advance, and stopping the auxiliary shielding gas 5s in delay; setting the wire feeding speed of the wire feeding device, synchronizing walking and wire feeding, and drawing wires in advance; the flow of the main protective gas is 15L/min, and the flow of the auxiliary protective gas is 8L/min; when the single wire is fed, the single wire feeding speed is 260 cm/min.
(3) Adjusting corresponding parameters, and starting a rotating motor to enable the non-axisymmetric tungsten electrode to start rotating; and (4) carrying out high-frequency arc striking, starting a welding robot moving system, and carrying out material increase.
As shown in FIG. 7, the additive formed part has smooth side wall and high precision. As can be seen from the cross-sectional view, the fusion between the layers of the formed piece is good without obvious defects. As shown in fig. 8a and 8b, the rotating arc additive is organized more densely than conventional GTA arc additives.
Example 6:
an additive method using a rotating arc GTAW welding system suitable for arc additive manufacturing as described in example 1, with the steps as described in example 5, except that in step (2), the single wire feed speed is 240 cm/min.
Example 7:
an additive method using a rotating arc GTAW welding system suitable for arc additive manufacturing as described in example 1, with the steps as described in example 5, except that in step (2), the single wire feed speed is 360 cm/min.
Example 8:
the material increase method of the rotating arc GTAW welding system suitable for arc material increase manufacturing in the embodiment 1 comprises the following steps of (5), wherein in the step (2), double-wire feeding is adopted to improve the material increase efficiency and the material increase width, and the wire feeder is controlled by a PLC (programmable logic controller) to synchronously feed wires so as to ensure the wire feeding speed to be consistent; the wire feeding speed in the double wire feeding mode is 220 cm/min.
Example 9:
an additive method using a rotary arc GTAW welding system suitable for arc additive manufacturing as described in example 1, comprising the steps of example 8, except that in step (2), the wire feed speed in the twin wire feed mode is 200 cm/min.
Example 10:
an additive method using a rotary arc GTAW welding system suitable for arc additive manufacturing as described in example 1, comprising the steps of example 8, except that in step (2), the wire feed speed in the twin wire feed mode is 240 cm/min.
Claims (10)
1. A rotary electric arc GTAW welding system suitable for electric arc additive manufacturing is characterized by comprising an argon arc welding power supply, a rotary electric arc GTAW welding gun, a welding robot and a wire feeding device;
the rotary arc GTAW welding gun comprises a welding gun shell, a rotary motor, a central rotating shaft, a non-axisymmetric tungsten electrode, a conductive system and an air supply system, wherein the rotary motor is connected with the non-axisymmetric tungsten electrode through the central rotating shaft, and the conductive system is used for being connected with an argon arc welding power supply and supplying power; the gas supply system is used for supplying shielding gas to the interior of the welding gun; the gas supply system comprises a main protective gas structure and an auxiliary protective gas structure, the main protective gas is introduced from the top of the welding gun to fill the gas chamber in the welding gun body, the lower part of the welding gun is provided with an auxiliary port, and the auxiliary protective gas is introduced from the lower part of the welding gun to enhance the gas pressure in the welding gun body;
the rotary arc GTAW welding gun is fixed on the welding robot, and the welding robot drives the rotary arc GTAW welding gun to move;
the wire feeding device is mechanically connected with a rotary electric arc GTAW welding gun and is matched with an argon arc welding power supply.
2. The rotary arc GTAW welding system adapted for arc additive manufacturing of claim 1 wherein the non-axisymmetric tungsten tip is a tilted surface having an angle of inclination between 35 ° and 50 °.
3. The rotary arc GTAW welding system suitable for arc additive manufacturing according to claim 2, wherein the end part of the non-axisymmetric tungsten electrode inclined plane is horizontally provided with a blunt platform, and the width of the platform is 1-1.5 mm.
4. The rotary arc GTAW welding system suitable for arc additive manufacturing according to claim 1, wherein a ceramic nozzle is arranged below the rotary arc GTAW welding gun, a non-axisymmetric tungsten electrode penetrates through the ceramic nozzle, a welding gun bottom support cover is arranged on the outer side of the ceramic nozzle, and a three-hole exhaust port is formed between the welding gun bottom support cover and the ceramic nozzle.
5. The rotary arc GTAW welding system adapted for arc additive manufacturing of claim 1 wherein the three-hole exhaust outlets have an angular difference of 60 ° and are arranged in a trailing aperture and a two-sided aperture, the trailing aperture always being directly above the deposited metal and the two-sided aperture being on both sides of the deposited metal.
6. The rotary arc GTAW welding system adapted for arc additive manufacturing of claim 1 wherein the wire feeder comprises a twin wire feed tube having an oval cross-section with two side-by-side circular channels for receiving the wire;
preferably, a heating resistance wire device is added on the double-wire feeding pipe.
7. An additive method using a rotating arc GTAW welding system suitable for arc additive manufacturing as claimed in any of claims 1-6, comprising the steps of:
(1) arranging a substrate before material increase, fixing the substrate by using a tool clamp, polishing the surface of the substrate and cleaning the surface of the substrate by using alcohol to remove rust and oil dirt; polishing the bottom of a tungsten electrode into a shape of an inclined conical surface with a platform;
(2) starting the welding robot, planning the additive path and then performing teaching programming to enable the wire feeding pipe to be positioned in the advancing direction of the welding gun all the time; setting the tungsten electrode height to a constant value; adjusting the walking speed of a welding gun in the material increase process; after programming, idle walking is carried out to ensure that the path is error-free; starting an argon arc welding power supply, adjusting a welding machine to be in a constant current mode, setting electrical parameters, starting main shielding gas and auxiliary shielding gas 5s in advance, and stopping the auxiliary shielding gas 5s in a delayed manner; setting the wire feeding speed of the wire feeding device, synchronizing walking and wire feeding, and drawing wires in advance;
(3) adjusting corresponding parameters, and starting a rotating motor to enable the non-axisymmetric tungsten electrode to start rotating; and performing high-frequency arc striking and material increase.
8. The additive manufacturing method of the rotating arc GTAW welding system suitable for arc additive manufacturing according to claim 7, wherein in step (1), a tungsten electrode with a diameter of 3.0mm is adopted, and a 45-degree inclined surface is machined at the bottom of the tungsten electrode and is provided with a platform with a width of 1 mm.
9. The additive manufacturing method of a rotating arc GTAW welding system suitable for arc additive manufacturing according to claim 7, wherein in the step (2), the rotating speed of the tungsten electrode is 300rpm, the height of the tungsten electrode is 3mm, the walking speed of the welding gun is 30cm/min, and the current is 170A; the flow of the main protective gas is 15L/min, and the flow of the auxiliary protective gas is 8L/min; and when the single wire is fed, the single wire feeding speed is 240-360 cm/min.
10. The additive method of a rotating arc GTAW welding system suitable for arc additive manufacturing of claim 9 wherein in step (2), dual wire feeding is employed, the wire feeder being synchronously fed with PLC control; the wire feeding speed of the double-wire feeding mode is 200-240 cm/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210194007.6A CN114406417B (en) | 2022-03-01 | 2022-03-01 | Rotary arc GTA additive manufacturing system and method based on non-axisymmetric tungsten electrode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210194007.6A CN114406417B (en) | 2022-03-01 | 2022-03-01 | Rotary arc GTA additive manufacturing system and method based on non-axisymmetric tungsten electrode |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114406417A true CN114406417A (en) | 2022-04-29 |
| CN114406417B CN114406417B (en) | 2023-06-27 |
Family
ID=81261253
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210194007.6A Active CN114406417B (en) | 2022-03-01 | 2022-03-01 | Rotary arc GTA additive manufacturing system and method based on non-axisymmetric tungsten electrode |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114406417B (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101417365A (en) * | 2007-10-26 | 2009-04-29 | 通用汽车环球科技运作公司 | Torch and contact tip for gas metal arc welding |
| CN204262572U (en) * | 2014-11-18 | 2015-04-15 | 上海空间电源研究所 | A kind of two spout argon-arc welding guns for increasing arc energy density and protected effect |
| CN104907679A (en) * | 2015-06-30 | 2015-09-16 | 张建生 | Carbon dioxide welding gun with top-end filtering support device |
| US20160121423A1 (en) * | 2014-11-04 | 2016-05-05 | Fronius International Gmbh | Tig welding torch |
| CN206153736U (en) * | 2016-11-21 | 2017-05-10 | 浙江内曼格机械制造有限公司 | Frock of splashing is prevented in arc stud welding |
| CN109926695A (en) * | 2017-12-15 | 2019-06-25 | 南京理工大学 | A kind of robot single machine is the same as the double non-melt pole electrical arc increasing material manufacturing method and apparatus that fill silk of mouth |
| CN110977109A (en) * | 2019-11-13 | 2020-04-10 | 山东大学 | GTAW welding system and method suitable for ultra-narrow gap |
| CN210967409U (en) * | 2019-11-12 | 2020-07-10 | 苏州维尔德焊接科技有限公司 | Double wire feeding hot wire water cooling TIG welding gun |
| CN111496345A (en) * | 2019-01-31 | 2020-08-07 | 南京理工大学 | Method and device for manufacturing melting electrode electric arc and hot filler wire composite single-electric-arc twin-wire additive |
| CN111774700A (en) * | 2020-06-16 | 2020-10-16 | 广东省焊接技术研究所（广东省中乌研究院） | Narrow-gap TIG welding device |
-
2022
- 2022-03-01 CN CN202210194007.6A patent/CN114406417B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101417365A (en) * | 2007-10-26 | 2009-04-29 | 通用汽车环球科技运作公司 | Torch and contact tip for gas metal arc welding |
| US20160121423A1 (en) * | 2014-11-04 | 2016-05-05 | Fronius International Gmbh | Tig welding torch |
| CN204262572U (en) * | 2014-11-18 | 2015-04-15 | 上海空间电源研究所 | A kind of two spout argon-arc welding guns for increasing arc energy density and protected effect |
| CN104907679A (en) * | 2015-06-30 | 2015-09-16 | 张建生 | Carbon dioxide welding gun with top-end filtering support device |
| CN206153736U (en) * | 2016-11-21 | 2017-05-10 | 浙江内曼格机械制造有限公司 | Frock of splashing is prevented in arc stud welding |
| CN109926695A (en) * | 2017-12-15 | 2019-06-25 | 南京理工大学 | A kind of robot single machine is the same as the double non-melt pole electrical arc increasing material manufacturing method and apparatus that fill silk of mouth |
| CN111496345A (en) * | 2019-01-31 | 2020-08-07 | 南京理工大学 | Method and device for manufacturing melting electrode electric arc and hot filler wire composite single-electric-arc twin-wire additive |
| CN210967409U (en) * | 2019-11-12 | 2020-07-10 | 苏州维尔德焊接科技有限公司 | Double wire feeding hot wire water cooling TIG welding gun |
| CN110977109A (en) * | 2019-11-13 | 2020-04-10 | 山东大学 | GTAW welding system and method suitable for ultra-narrow gap |
| CN111774700A (en) * | 2020-06-16 | 2020-10-16 | 广东省焊接技术研究所（广东省中乌研究院） | Narrow-gap TIG welding device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114406417B (en) | 2023-06-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101862886B (en) | Hot wire consumable electrode gas protection welding method and realization device thereof | |
| CN111014993B (en) | Metal material ultra-efficient additive manufacturing method | |
| US6469277B1 (en) | Method and apparatus for hybrid welding under shielding gas | |
| CN111496345A (en) | Method and device for manufacturing melting electrode electric arc and hot filler wire composite single-electric-arc twin-wire additive | |
| CN102500885A (en) | Gas tungsten arc welding (GTAW) system and welding method thereof | |
| US20080169336A1 (en) | Apparatus and method for deep groove welding | |
| CN110039156B (en) | Tungsten-wire electric arc additive manufacturing device and method under auxiliary wire action | |
| CN104985303B (en) | A kind of InFocus TOPTIG twin arc complex welding methods | |
| CN104014933B (en) | A kind of method of laser-TOPTIG composite welding | |
| CN109926695A (en) | A kind of robot single machine is the same as the double non-melt pole electrical arc increasing material manufacturing method and apparatus that fill silk of mouth | |
| CN107186322B (en) | Half-split hollow tungsten electrode coaxial wire feeding inert gas shielded welding gun | |
| CN112743204A (en) | Hollow tungsten electrode coaxial filler wire welding device and regulation and control and welding method | |
| CN110238491A (en) | A kind of method of CMT submerged arc welding inconel | |
| CN108788395A (en) | A kind of integral type TIG by the double wire feeds of sidewall symmetry welds nozzle and welding gun | |
| CN110216358A (en) | A kind of efficient adjusting welding wire distribution submerged arc welding apparatus | |
| CN110977109B (en) | GTAW welding system and method suitable for ultra-narrow gap | |
| CN109175639A (en) | A kind of double plasma arc increasing material manufacturing devices of coaxial wire feed | |
| CN114769796A (en) | TOPTIG electric arc additive manufacturing device and method for modified aluminum alloy | |
| CN210633115U (en) | Welding gun head and laser-arc hybrid welding device | |
| CN114406417A (en) | Rotary arc GTA additive manufacturing system and method based on non-axisymmetric tungsten electrode | |
| CN109483022B (en) | Gas-magnetic combined regulation and control double-tungsten-electrode TOPTIG welding method | |
| CN102699546A (en) | Laser double-consumable-electrode single-arc bypass-coupling hybrid welding system and method | |
| CN110666355A (en) | Welding gun head, laser arc composite welding device and method | |
| CN116000457B (en) | Laser coaxial-induction multi-TIG electric arc multi-wire rapid additive manufacturing method and manufacturing system | |
| US20140103014A1 (en) | Wire electric discharge machine and wire electric discharge machining method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |