CN111774700A - Narrow-gap TIG welding device - Google Patents
Narrow-gap TIG welding device Download PDFInfo
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- CN111774700A CN111774700A CN202010546106.7A CN202010546106A CN111774700A CN 111774700 A CN111774700 A CN 111774700A CN 202010546106 A CN202010546106 A CN 202010546106A CN 111774700 A CN111774700 A CN 111774700A
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- air inlet
- tig welding
- narrow
- tungsten electrode
- gun body
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- 238000003466 welding Methods 0.000 title claims abstract description 88
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims abstract description 54
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 54
- 239000010937 tungsten Substances 0.000 claims abstract description 54
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 20
- 229910052802 copper Inorganic materials 0.000 claims description 20
- 239000010949 copper Substances 0.000 claims description 20
- 238000001816 cooling Methods 0.000 claims description 18
- 210000004907 gland Anatomy 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 230000004927 fusion Effects 0.000 abstract description 6
- 238000010438 heat treatment Methods 0.000 abstract description 6
- 239000007789 gas Substances 0.000 description 39
- 238000010891 electric arc Methods 0.000 description 27
- 238000009826 distribution Methods 0.000 description 5
- 238000003825 pressing Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000009423 ventilation Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
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
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
Abstract
The invention discloses a narrow-gap TIG welding device, which comprises a narrow-gap welding gun, a first air supply device and a TIG welding power supply, wherein the narrow-gap welding gun is connected with the first air supply device through a power supply; the narrow-gap welding gun comprises a gun body and a hollow tungsten electrode, wherein a cavity is arranged in the gun body, the gun body is provided with a first end part and a second end part which are oppositely arranged, a first air inlet is formed at the first end part, and a nozzle is formed at the second end part; the hollow tungsten electrode is arranged in the cavity along the axis direction of the gun body, one end of the hollow tungsten electrode penetrates out of the nozzle, the other end of the hollow tungsten electrode is communicated to a first air inlet through a first air inlet channel, and the first air inlet is connected with a first air supply device; and the cathode of the TIG welding power supply is connected with the gun body, and the anode of the TIG welding power supply is connected with a workpiece to be welded. The narrow-gap TIG welding device can effectively solve the problems that the effective heating area of a welding arc is small and the sufficient fusion of the side wall of a narrow-gap groove is difficult to ensure in the prior art.
Description
Technical Field
The invention relates to the technical field of welding equipment, in particular to a narrow-gap TIG welding device.
Background
When a thick-wall structure is welded, compared with large-angle V-shaped groove welding, narrow-gap welding has the advantages of high welding efficiency, less filling materials, low heat input, small deformation and the like due to the adoption of narrow and deep small-angle grooves, and has good application prospect in the field of thick-wall structure manufacturing. But different from the traditional V-shaped groove which is positioned below the electric arc, the side wall of the narrow-gap groove is almost parallel to the central axis of the electric arc, so that the electric arc can not directly heat the side wall of the groove. In addition, the heat of the conventional electric arc is in Gaussian distribution, the heat distribution of the periphery of the electric arc is low, the effective heating area is small, and the sufficient fusion of the side wall of the narrow-gap groove is difficult to ensure, so that serious adverse effects are caused on the safety and stability of a thick-wall structure.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a narrow gap TIG welding apparatus that can effectively solve the technical problems of the prior art that an effective welding arc heating area is small and it is difficult to ensure sufficient fusion of the narrow gap groove side wall.
In order to achieve the purpose, the invention provides a narrow-gap TIG welding device which comprises a narrow-gap welding gun, a first air supply device and a TIG welding power supply;
the narrow-gap welding gun comprises a gun body and a hollow tungsten electrode, wherein a cavity is arranged in the gun body, the gun body is provided with a first end part and a second end part which are oppositely arranged, a first air inlet is formed at the first end part, and a nozzle is formed at the second end part;
the hollow tungsten electrode is arranged in the cavity along the axis direction of the gun body, one end of the hollow tungsten electrode penetrates out of the nozzle, the other end of the hollow tungsten electrode is communicated to the first air inlet through a first air inlet channel, and the first air inlet is connected with the first air supply device;
and the cathode of the TIG welding power supply is connected with the gun body, and the anode of the TIG welding power supply is connected with a workpiece to be welded.
The gun body is provided with a first air inlet, the first air inlet is connected with the first air supply device, and the first air inlet is communicated to the nozzle through a first air inlet channel.
Further, the gas filter further comprises a filtering assembly, wherein the filtering assembly is arranged in the second gas inlet channel so as to filter gas entering from the second gas inlet.
Furthermore, the tungsten electrode cooling device further comprises a water cooling channel, wherein the water cooling channel is arranged in the cavity to cool the hollow tungsten electrode.
Furthermore, the number of the water-cooling channels is two, and the two water-cooling channels are symmetrically arranged on two sides of the hollow tungsten electrode.
Further, the gun body comprises a copper column section and a shell, the cavity is formed in the shell, one end of the copper column section is inserted into the cavity, and a space between the outer surface of the copper column section and the inner wall of the shell forms the second air inlet channel;
the first air inlet channel is formed in the copper column section and extends vertically upwards; the water cooling channel is formed in the copper column section, is arranged in parallel to the first air inlet channel and is longer than the first air inlet channel; the nozzle is formed at a second end of the housing and the second air inlet is formed in the housing.
Further, the shell comprises a first shell and a second shell, the first shell is sleeved at the first end of the second shell, and the first shell is communicated with the inner space of the second shell to form the cavity; the nozzle is formed at a second end of the second housing, and the second air inlet is formed on the first housing.
Furthermore, the gun body also comprises a gland, and the gland is arranged at the other end of the copper column section in a pressing manner; the first air inlet is formed in the gland; and the negative electrode of the TIG welding power supply is connected with the gland.
The narrow-gap TIG welding device provided by the invention has the beneficial effects that: compared with the prior art, the narrow-gap TIG welding device adopts the hollow tungsten electrode to burn the arc, thereby reducing the current density of the center of the arc and improving the expansion degree of the arc; meanwhile, the other end of the hollow tungsten electrode is communicated to the first air inlet through a first air inlet channel, and the first air inlet is connected with the first air supply device; therefore, neutral gas can be introduced into the hollow tungsten electrode, the pressure from the center of the electric arc to the periphery of the electric arc is increased, the radial flow strength of the plasma is strengthened, the shape of the electric arc is expanded, the peripheral energy distribution of the electric arc is increased, the expanded electric arc is combusted on the side wall of the narrow-gap groove, an effective heating area is increased, and the fusion quality of the side wall of the groove is improved; meanwhile, gas is introduced into the hollow tungsten electrode, so that the temperature of the hollow tungsten electrode can be reduced, the current bearing capacity of the tungsten electrode is improved, and the upper limit of welding current is improved. In addition, the narrow-gap TIG welding device does not need to additionally add devices such as a motor swing device, a motor rotation device or an alternating magnetic field, and the like, and directly regulates and controls the ventilation flow of the hollow tungsten electrode through the first air supply device, so that the expansion degree of an electric arc is regulated and controlled.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
FIG. 1 is a schematic view of a narrow gap TIG welding apparatus of the present invention;
FIG. 2 is a schematic view of a narrow gap welding gun of the narrow gap TIG welding apparatus of the present invention;
fig. 3 is an exploded view of a narrow gap welding gun of the narrow gap TIG welding apparatus of the present invention.
The welding gun comprises a welding gun body, a welding gun cover, a pressing cover, a welding gun body, a welding gun cover, a welding gun body, a copper column section, a welding gun body, a first air inlet channel, 1122, a water cooling channel, 113, a shell, 1131, a first shell, 1132, a second shell, 12, a hollow tungsten electrode, 13, a first air inlet, 14, a nozzle, 15, a second air inlet, 16, a second air inlet channel, 17, a filtering component, 2, a first.
Detailed Description
In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
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.
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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.
As shown in fig. 1 to 3, the present invention provides a narrow gap TIG welding device, including a narrow gap welding gun 1, a first gas supply device 2, and a TIG welding power supply 3;
the narrow gap welding gun 1 comprises a gun body 11 and a hollow tungsten electrode 12, wherein a cavity is arranged in the gun body 11, the gun body 11 is provided with a first end part and a second end part which are oppositely arranged, the first end part is provided with a first air inlet 13, and the second end part is provided with a nozzle 14; the hollow tungsten electrode 12 is arranged in the cavity along the axial direction of the gun body 11, one end of the hollow tungsten electrode 12 penetrates through the nozzle 14, the other end of the hollow tungsten electrode 12 is communicated to the first air inlet 13 through a first air inlet channel 1121, and the first air inlet 13 is connected to the first air supply device 2; the negative electrode of the TIG welding power supply 3 is connected with the gun body 11, and the positive electrode of the TIG welding power supply 3 is connected with the workpiece 5 to be welded;
based on the structure, compared with the prior art, the narrow-gap TIG welding device disclosed by the invention adopts the hollow tungsten electrode 12 for arc burning, so that the central current density of an electric arc is reduced, and the expansion degree of the electric arc is improved; meanwhile, the other end of the hollow tungsten electrode 12 is designed to be communicated to the first air inlet 13 through a first air inlet channel 1121, and the first air inlet 13 is connected with the first air supply device 2; therefore, the plasma gas can be introduced into the hollow tungsten electrode 12 to increase the pressure from the center of the electric arc to the periphery of the electric arc and strengthen the radial flow strength of the plasma, so that the form of the electric arc is expanded, the peripheral energy distribution of the electric arc is increased, the expanded electric arc is combusted on the side wall of the narrow-gap groove, the effective heating area is increased, and the fusion quality of the side wall of the groove is improved; meanwhile, gas is introduced into the hollow tungsten electrode 12, so that the temperature of the hollow tungsten electrode 12 can be reduced, the current bearing capacity of the tungsten electrode is improved, and the upper limit of welding current is improved. In addition, the narrow-gap TIG welding device does not need to additionally add a device such as motor swinging, rotating or alternating magnetic field, and the like, and directly regulates and controls the ventilation flow of the hollow tungsten electrode 12 through the first air supply device 2, thereby regulating and controlling the expansion degree of the electric arc. The welding device has simple structure, is flexible and convenient, and can adapt to narrow-gap grooves with different widths.
Specifically, in one embodiment, the hollow tungsten electrode 12 is made of a non-melting electrode, and the inner cavity of the hollow tungsten electrode 12 can be adjusted to be round, square or other shapes.
Specifically, in one embodiment, the welding wire may be fed through the first gas inlet 13, sequentially through the first gas inlet channel 1121, the internal cavity of the hollow tungsten electrode 12, and to the arc region of the hollow tungsten electrode 12; alternatively, the welding wire may be fed directly from the outside to the arc region of the hollow tungsten electrode 12. In the present embodiment, the feeding method of the welding wire is not particularly limited.
Further, referring to fig. 1, as a specific embodiment of the narrow gap TIG welding device provided by the present invention, the TIG welding device further includes a second gas supply device 4, the gun body 11 is provided with a second gas inlet 15, the second gas inlet 15 is connected to the second gas supply device 4, and the second gas inlet 15 is communicated to the nozzle 14 through a second gas inlet channel 16. In this way, the gas can be supplied to the nozzle 14 by the second gas supply device 4, thereby protecting the narrow groove welding region.
Specifically, in one embodiment, the gas delivered by the first gas delivery device 2 is a gas with high energy density, such as helium; the gas delivered by the second gas delivery device 4 is low-cost argon; therefore, the welding cost can be saved, and the energy density of the electric arc is improved.
Further, it should be noted that the type and flow rate of the gas supplied by the first gas supply device 2 may be adjusted according to actual welding use requirements, so as to be more suitable for requirements of different workpiece materials and groove sizes, and are not particularly limited herein.
Further, it should be noted that the shielding gas supplied from the second gas supply device 4 is different from the gas supplied from the first gas supply device 2, so that the welding apparatus according to the present invention has advantages of multi-gas welding, and has advantages of high efficiency and low cost.
Further, referring to fig. 1 and 3, as an embodiment of the narrow gap TIG welding apparatus provided by the present invention, the apparatus further includes a filter assembly 17, where the filter assembly 17 is disposed in the second gas inlet channel 16 to filter the gas entering from the second gas inlet 15. In this way, the gas delivered by the second gas delivery device 4 can be filtered and compressed to form a laminar protective gas with high stiffness, so as to better protect the welding area with a deep and narrow groove.
Further, referring to fig. 1, as an embodiment of the narrow gap TIG welding apparatus provided by the present invention, the apparatus further includes a water cooling channel 1122, where the water cooling channel 1122 is disposed in the cavity to cool the hollow tungsten electrode 12. Therefore, the temperature of the hollow tungsten electrode 12 can be further reduced, so that the current carrying capacity of the tungsten electrode is increased, the upper limit of welding current is improved, and the service life of the hollow tungsten electrode 12 can be prolonged.
Specifically, referring to fig. 1, in one embodiment, the number of the water-cooling channels 1122 is two, and the two water-cooling channels 1122 are symmetrically disposed on two sides of the hollow tungsten electrode 12.
Further, referring to fig. 1 to 3, as an embodiment of the narrow gap TIG welding apparatus provided by the present invention, the gun body 11 includes a copper column section 112 and a housing 113, the cavity is formed inside the housing 113, one end of the copper column section 112 is inserted into the cavity, and a space between an outer surface of the copper column section 112 and an inner wall of the housing 113 is formed as the second air inlet channel 16;
the first air inlet channel 1121 is formed in the copper column section 112 and extends vertically upward; the water-cooling channel 1122 is formed in the copper column section 112, the water-cooling channel 1122 is arranged in parallel with the first air inlet channel 1121, and the water-cooling channel 1122 is longer than the first air inlet channel 1121; the nozzle 14 is formed at a second end portion of the housing 113, and the second air inlet 15 is formed on the housing 113.
Further, referring to fig. 1 to 3, as an embodiment of the narrow gap TIG welding device provided by the present invention, the outer shell 113 includes a first shell 1131 and a second shell 1132, the first shell 1131 is sleeved on a first end portion of the second shell 1132, and the first shell 1131 is communicated with an inner space of the second shell 1132 to form the cavity; the nozzle 14 is formed at a second end portion of the second housing 1132, and the second air inlet 15 is formed on the first housing 1131.
Further, referring to fig. 1 to fig. 3, as a specific embodiment of the narrow gap TIG welding device provided by the present invention, the gun body 11 further includes a pressing cover 111, and the pressing cover 111 is pressed on the other end of the copper column section 112; the first air inlet 13 is formed in the gland 111; and the negative electrode of the TIG welding power supply 3 is connected with the gland 111. Specifically, in one embodiment, the gland 111 is a copper material or other conductive material. In this way, the negative electrode of the TIG welding power supply 3 is connected to the gland 111, and substantially the negative electrode of the TIG welding power supply 3 is connected to the hollow tungsten electrode 12.
In conclusion, the narrow-gap TIG welding device disclosed by the invention adopts the hollow tungsten electrode 12 for arc burning, so that the central current density of an electric arc is reduced, and the expansion degree of the electric arc is improved; meanwhile, the other end of the hollow tungsten electrode 12 is designed to be communicated to the first air inlet 13 through a first air inlet channel 1121, and the first air inlet 13 is connected with the first air supply device 2; therefore, neutral gas can be introduced into the hollow tungsten electrode 12, the pressure from the center of the electric arc to the periphery of the electric arc is increased, and the radial flow strength of the plasma is strengthened, so that the form of the electric arc is expanded, the peripheral energy distribution of the electric arc is increased, the expanded electric arc is combusted on the side wall of the narrow-gap groove, an effective heating area is increased, and the fusion quality of the side wall of the groove is improved; meanwhile, gas is introduced into the hollow tungsten electrode 12, so that the temperature of the hollow tungsten electrode 12 can be reduced, the current bearing capacity of the tungsten electrode is improved, and the upper limit of welding current is improved. In addition, the narrow-gap TIG welding device does not need to additionally add devices such as a motor swing device, a motor rotation device or an alternating magnetic field, and the like, and directly regulates and controls the ventilation flow of the hollow tungsten electrode 12 through the first air supply device 2, so that the arc expansion degree is regulated and controlled.
The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (8)
1. A narrow-gap TIG welding device is characterized by comprising a narrow-gap welding gun, a first air supply device and a TIG welding power supply;
the narrow-gap welding gun comprises a gun body and a hollow tungsten electrode, wherein a cavity is arranged in the gun body, the gun body is provided with a first end part and a second end part which are oppositely arranged, a first air inlet is formed at the first end part, and a nozzle is formed at the second end part;
the hollow tungsten electrode is arranged in the cavity along the axis direction of the gun body, one end of the hollow tungsten electrode penetrates out of the nozzle, the other end of the hollow tungsten electrode is communicated to the first air inlet through a first air inlet channel, and the first air inlet is connected with the first air supply device;
and the cathode of the TIG welding power supply is connected with the gun body, and the anode of the TIG welding power supply is connected with a workpiece to be welded.
2. The narrow gap TIG welding device of claim 1, further comprising a second gas feed, the gun body defining a second gas inlet, the second gas inlet coupled to the second gas feed, the second gas inlet coupled to the nozzle via a second gas feed passage.
3. The narrow gap TIG welding device of claim 2, further comprising a filter assembly disposed in the second inlet passage to filter gas entering from the second inlet port.
4. The narrow gap TIG welding device of claim 2, further comprising a water cooling passage disposed within the cavity to cool the hollow tungsten electrode.
5. The narrow gap TIG welding device according to claim 4, wherein the number of the water cooling passages is two, and the two water cooling passages are symmetrically arranged on two sides of the hollow tungsten electrode.
6. The narrow gap TIG welding device according to claim 4, wherein the gun body includes a copper cylinder section and a housing, the cavity is formed inside the housing, one end of the copper cylinder section is inserted into the cavity, and a space between an outer surface of the copper cylinder section and an inner wall of the housing forms the second air inlet passage;
the first air inlet channel is formed in the copper column section and extends vertically upwards; the water cooling channel is formed in the copper column section, is arranged in parallel to the first air inlet channel and is longer than the first air inlet channel; the nozzle is formed at a second end of the housing and the second air inlet is formed in the housing.
7. The narrow gap TIG welding apparatus of claim 6, wherein the outer shell comprises a first shell and a second shell, the first shell being sleeved over a first end of the second shell, the first shell being in communication with an interior space of the second shell to form the cavity; the nozzle is formed at a second end of the second housing, and the second air inlet is formed on the first housing.
8. The narrow gap TIG welding device of claim 6, wherein the gun body further comprises a gland pressed against the other end of the copper post segment; the first air inlet is formed in the gland; and the negative electrode of the TIG welding power supply is connected with the gland.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010546106.7A CN111774700B (en) | 2020-06-16 | 2020-06-16 | Narrow-gap TIG welding device |
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|---|---|---|---|
| CN202010546106.7A CN111774700B (en) | 2020-06-16 | 2020-06-16 | Narrow-gap TIG welding device |
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| CN111774700A true CN111774700A (en) | 2020-10-16 |
| CN111774700B CN111774700B (en) | 2023-12-05 |
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| CN114406417A (en) * | 2022-03-01 | 2022-04-29 | 山东大学 | Rotary arc GTA additive manufacturing system and method based on non-axisymmetric tungsten electrode |
| CN115007974A (en) * | 2022-04-19 | 2022-09-06 | 上海工程技术大学 | Tungsten electrode argon arc welding method with electric arc negative pressure constraint |
| CN115007974B (en) * | 2022-04-19 | 2024-03-08 | 上海工程技术大学 | Argon tungsten-arc welding method with negative arc pressure constraint |
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| CN111774700B (en) | 2023-12-05 |
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