CN114226934A - Primary gas protection device for narrow-gap MAG/MIG automatic welding - Google Patents
Primary gas protection device for narrow-gap MAG/MIG automatic welding Download PDFInfo
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- CN114226934A CN114226934A CN202111668979.6A CN202111668979A CN114226934A CN 114226934 A CN114226934 A CN 114226934A CN 202111668979 A CN202111668979 A CN 202111668979A CN 114226934 A CN114226934 A CN 114226934A
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- gas
- axial
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- flow
- welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
- B23K9/325—Devices for supplying or evacuating shielding gas
-
- 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
- B23K9/173—Arc welding or cutting making use of shielding gas and of a consumable electrode
Abstract
The invention discloses a primary gas protection device for narrow-gap MAG/MIG automatic welding, which comprises a rear gas splitter, an axial front flow channel, an axial rear flow channel, a front uniform flow nozzle and a rear uniform flow nozzle; the rear gas splitter comprises a splitter body, a gas inlet hole, a filament inlet channel and a gas inlet pressure equalizing cavity; the center of sending the silk passageway coincides with the center of shunt body, send the silk passageway to set up in the center of rearmounted shunt, and the even pressure chamber of admitting air sets up in the lower part of shunt, and the inlet port setting of primary shielding gas is on the upper portion of the even pressure chamber of admitting air, the even air feed of the axial forward flow way and axial back flow way will be nature to the gas in the even pressure chamber of admitting air. The laminar flow protection effect is excellent, and the surface of a welding seam is bright and has silvery metallic luster; the excellent gas protection effect is realized under the condition of ultralow primary gas consumption, and the gas consumption is reduced by 40 to 300 percent compared with the prior art; the welding production cost is greatly reduced.
Description
Technical Field
The invention belongs to the technical field of gas protection of narrow-gap gas shielded welding, and particularly relates to a primary gas protection device for narrow-gap MAGMIG automatic welding.
Background
The gas protection technology under the narrow gap welding condition is very obviously different from the traditional gas protection welding technology, namely the axial symmetry perfect circle protection technology widely used in the traditional technology is completely inapplicable under the narrow gap condition, the main reason is that the narrow gap gas protection welding gun with small size in the thickness direction is originated, and the hardware device of the axial symmetry perfect circle protection technology cannot be designed and manufactured at all. The gas protection technology under the condition of narrow gap welding needs to be developed from hardware to software (process parameters).
The development and application of the narrow-gap gas shielded welding technology for half a century form the following four main types of gas shielded technologies under the existing narrow-gap welding condition: 1. non-axial front and back air supply for primary protection; 2. the axial forward and backward air supply is used for primary protection; 3. meanwhile, a secondary gas protection technology is adopted; 4. meanwhile, a large-flow gas protection technology based on filter tube uniform flow is adopted.
In japan, in the beginning of the last 80 th century, a front and rear box type gas shielded technology of narrow gap gas shielded welding was developed [ narrow gap welding ] in japan society for welding, methods committee, P34, press of mechanical industry, 7 months 1988, and good protection of a high temperature weld zone was achieved within a range of a groove gap of 12 to 18. However, the primary shielding gas is non-axial gas supply, turbulence is easy to generate, and the consumption of the primary shielding gas and the secondary shielding gas is as high as 50-60L/min.
In the last 80 th century of japan, a narrow gap gas shield technology of an inner and outer double-layer nozzle was developed [ narrow gap welding ] in the committee of the methods of the japan society of welding, P90, press of mechanical industries, 7 months in 1988 ]. The primary gas and the secondary gas are both axial gas supply, the adverse effect of turbulent flow on the protection effect is reduced, but the primary gas is not directly introduced into the notch, and when the thickness of the welding plate exceeds the standard extension length of the welding wire, the gas flow, especially the flow of the primary gas, must be very large, otherwise reliable metallurgical protection cannot be realized.
The invention patent ZL200410060991.9 relates to an ultra-narrow gap consumable electrode gas shielded automatic welding torch and a manufacturing method thereof, which provides a gas guide channel which is positioned at two adjacent sides of a guide wire channel and is used for axial gas supply, and the protection is reliable, but does not relate to related technologies in the aspects of primary protection gas flow state control and gas consumption.
The invention discloses a narrow-gap/ultra-narrow-gap gas shielded automatic welding gun and a manufacturing method thereof in patent ZL201410487955.4, and discloses an integral plate type multifunctional integrated narrow-gap gas shielded welding gun.
The invention discloses a narrow-gap/ultra-narrow-gap welding gun gas shunting device in patent ZL201410352228.7, and discloses a flow state control technology of primary gas protection under the condition of narrow-gap MAG/MIG welding, which has the limitations that gas flowing through a pipe wall is short, the flow state protection effect is poor, and the width of a welding gun is difficult to reduce to an ideal state.
The main limitation of the primary gas protection is that the primary gas protection technology with large flow rate is basically adopted, and the more precise flow state control technology and method and the primary gas protection technology with ultralow gas consumption are not seen.
Disclosure of Invention
The invention aims to provide a primary gas protection device for narrow-gap MAG/MIG automatic welding, which has excellent laminar flow protection effect, bright welding seam surface and silvery metallic luster; the excellent gas protection effect is realized under the condition of ultralow primary gas consumption, and the gas consumption is reduced by 40 to 300 percent compared with the prior art; the welding production cost is greatly reduced.
In order to achieve the purpose, the invention provides the following scheme:
a primary gas protection device for narrow-gap MAG/MIG automatic welding comprises a rear gas splitter, an axial front flow channel, an axial rear flow channel, a front uniform flow nozzle and a rear uniform flow nozzle;
the rear gas splitter comprises a splitter body, a gas inlet hole, a filament inlet channel and a gas inlet pressure equalizing cavity; the center of sending the silk passageway coincides with the center of shunt body, send the silk passageway to set up in the center of rearmounted shunt, and the even pressure chamber of admitting air sets up in the lower part of shunt, and the inlet port setting of primary shielding gas is on the upper portion of the even pressure chamber of admitting air, the even air feed of the axial forward flow way and axial back flow way will be nature to the gas in the even pressure chamber of admitting air.
Furthermore, preceding even stream nozzle and back even stream nozzle include nozzle body, inlet structure, contact tip laminating structure, location track groove, even class chamber, inlet structure meets with the protruding tube socket of runner, axial back runner before the axial, and even class chamber sets up and is used for reaching the high temperature protection district behind the even class of the first gas decompression that flows of runner before the axial and axial back runner at contact tip laminating structure both sides.
Furthermore, the contact tube attaching structure is a semicircular axial half groove and is attached to and positioned on a contact tube installed on a welding gun, and the positioning rail groove is a rectangular groove and is connected with a positioning rail on a welding gun seat.
Further, the minimum diameter of the air inlet pressure equalizing cavity is larger than the sum of the center distance between the front air flow channel and the rear air flow channel and the diameter of any air flow channel.
Further, the diverter body may be designed as a solid of revolution structure.
Furthermore, the volume of the air inlet pressure equalizing cavity is in a proportional relation with the maximum flow of the primary shielding gas, and when the volume unit of the pressure equalizing cavity is cubic millimeters and the maximum flow unit of the primary shielding gas is liter/minute, the ratio of the volume of the air inlet pressure equalizing cavity to the maximum flow of the primary shielding gas is 280-300.
Furthermore, the mounting position of the rear gas splitter is rear, namely, the mounting position is positioned at the position of the welding gun seat which does not enter the welding groove, and the rear gas splitter and the welding gun seat are connected in a threaded connection or a brazing connection mode.
Compared with the prior art, the invention has the beneficial effects that:
the narrow-gap MAG/MIG automatic welding gun has the following remarkable advantages: 1. under the continuous long-term work of the welding gun, the body temperature of the welding gun is always kept at the given circulating water temperature, and the long-term constancy of the welding current and the welding voltage is kept. 2. The welding gun has extremely high electric insulation capacity with the two side walls of the groove. 3. The service life of the contact tube is greatly prolonged. 4. Compared with the traditional narrow gap welding gun, the service life of the welding gun is prolonged by tens of times.
Drawings
Fig. 1 is a schematic view of a non-axial primary protection air box structure in japan.
Fig. 2 is a structural schematic view of the axial primary shielding gas and the axial secondary shielding gas in japan.
Fig. 3 is a schematic structural diagram of the primary protective gas ultra-low consumption system of the invention.
FIG. 4 is a schematic diagram of the configuration of the post gas splitter of the present invention.
FIG. 5 is a schematic view of a front and rear uniform flow nozzle configuration of the present invention.
In the figure: 1. the welding device comprises a front gas guide box, a rear gas guide box, 2, front and rear non-axial gas guide, 3, front and rear secondary shielding gas, 4, a welding wire, 5, an electric arc, 6, a molten pool, 7, a welding seam, 8, a contact tip, 9, inner layer primary shielding gas, 10, outer layer secondary shielding gas, 11, a rear shunt, 12, a gas inlet hole, 13, an axial front flow channel, 14, an axial rear flow channel, 15, a front uniform flow nozzle, 16, a rear uniform flow nozzle, 17, a wire feeding channel, 18, a welding gun seat, 19, a gas inlet uniform pressure cavity, 20, a welding gun seat, 21, a contact tip attaching structure, 22, a nozzle body, 23, a positioning track groove, 24, a uniform flow cavity and 25, wherein the welding gun is provided with a welding gun seat and a welding gun seat.
Detailed Description
The technical solution and the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.
For a better understanding of the present invention, the present invention is further illustrated below with reference to specific examples, which are provided for the purpose of illustration only and are not intended to limit the scope of the present invention.
Fig. 1 is a schematic diagram of a non-axial primary shielding gas box structure in japan, in which 1 is a front and rear gas guiding box, 2 is a front and rear non-axial gas guiding box, 3 is a front and rear secondary shielding gas, 4 is a welding wire, 5 is an arc, 6 is a molten pool, and 7 is a weld. Fig. 2 is a schematic view showing the structure of the axial primary shielding gas and the axial secondary shielding gas in japan, and differs from fig. 1 in that the primary gas and the secondary gas are all axially supplied, 8 is a contact tip, 9 is a primary axial gas supply flow channel, and 10 is a secondary gas axial gas supply flow channel. Both the configurations of fig. 1 and 2 have the limitation that the lateral protection range of the secondary facing and the facing bead is limited and the reliability of the protection is reduced.
Example 1
3-5, an ultra-low gas consumption primary protection device for narrow gap MAG/MIG automatic welding comprises a rear flow divider 11, an air inlet 12, an axial front flow channel 13, an axial rear flow channel 14, a front uniform flow nozzle 15 and a rear uniform flow nozzle 16. The rear gas splitter 11 comprises a splitter body 18, a gas inlet hole 12, a wire inlet channel 17 and a gas inlet pressure equalizing cavity 19. The diverter body 18 may be designed as a solid of revolution, with the center of the wire feed channel 17 coinciding with the center of the diverter body 18. A wire feed channel 17 is provided in the centre of the rear diverter 11, the diameter of the wire feed channel 17 being slightly larger than the outer diameter of the wire spring hose. An air inlet pressure equalizing cavity 19 is arranged at the lower part of the flow divider, and an air inlet hole 12 of primary protective air is arranged at the upper part of the air inlet pressure equalizing cavity 19. The minimum diameter of the inlet equalizing chamber is larger than the sum of the center distance between the front gas flow passage 13 and the rear gas flow passage 14 and the diameter of any one gas flow passage. The rear gas splitter 11 is mounted at the rear position and connected with the welding torch seat 20 by screw connection or brazing, that is, the rear gas splitter is located at the welding torch seat 20 which does not enter the welding groove.
The volume of the air inlet pressure equalizing cavity 19 is in proportional relation with the maximum flow of the primary shielding gas, and when the volume unit of the pressure equalizing cavity is cubic millimeters and the maximum flow unit of the primary shielding gas is liter/minute, the ratio of the volume of the air inlet pressure equalizing cavity 19 to the maximum flow of the primary shielding gas is 280-300. The axial front flow channel 13 and the axial rear flow channel 14 are arranged on the welding gun seat 20, and after the rear gas splitter 11 is mounted and connected with the welding gun seat 20, gas in the gas inlet uniform pressure cavity at the bottom of the rear gas splitter 11 naturally and uniformly supplies gas to the axial front flow channel 13 and the axial rear flow channel 14.
In the above embodiment, the distance between the axial forward flow channel 13 and the axial rearward flow channel 14 should be as small as possible.
The front flow equalizing nozzle 15 and the rear flow equalizing nozzle 16 are composed of a nozzle body 22, an air inlet structure 25, a contact nozzle attaching structure 21, a positioning rail groove 23 and a flow equalizing cavity 24. The air inlet structure 25 is connected with the extended pipe seats of the axial front flow passage and the axial rear flow passage. The contact tube attaching structure 21 is a semicircular axial half groove, and is attached to and positioned on a contact tube mounted on a welding gun. The positioning rail groove 23 is a rectangular groove and contacts with a positioning rail (convex rectangular rail) on the welding torch holder. The uniform flow cavity 24 is used for sending the primary gas sent into the axial front flow channel 13 or the axial rear flow channel 14 to a high-temperature protection area after pressure reduction and uniform flow. The front uniform flow nozzle 15 and the rear uniform flow nozzle 16 are axisymmetric structures and are used in pairs. One mounted on the front side of the contact tip and the other mounted on the rear side of the contact tip.
In the case of the example 2, the following examples are given,
in the embodiment of the ultra-low gas consumption primary protection technology of narrow-gap MAG/MIG automatic welding in the embodiment 2, the distance between the axial front flow channel 13 and the axial rear flow channel 14 is 10 mm. The ratio of the volume of the intake plenum chamber 19 to the maximum flow rate of the primary shielding gas is 280. The drift diameters of the axial front flow passage 13 and the axial rear flow passage 14 are 3 mm.
Example 3
Example 3 an ultra low gas consumption primary protection technique for narrow gap MAG/MIG automatic welding, the front and rear uniform flow nozzles 15 and 16 are made of alumina ceramic, and the flow area of one uniform flow cavity is 46mm2。
Finally, it should be noted that: the above is only used to illustrate the technical solution of the present invention, and not to limit it; although the invention has been described in detail with reference to specific embodiments, those skilled in the art will understand that: the technical solutions described in the foregoing embodiments may be modified or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A primary gas protection device for narrow-gap MAG/MIG automatic welding is characterized by comprising a rear gas splitter, an axial front flow channel, an axial rear flow channel, a front uniform flow nozzle and a rear uniform flow nozzle;
the rear gas splitter comprises a splitter body, a gas inlet hole, a filament inlet channel and a gas inlet pressure equalizing cavity; the center of sending the silk passageway coincides with the center of shunt body, send the silk passageway to set up in the center of rearmounted shunt, and the even pressure chamber of admitting air sets up in the lower part of shunt, and the inlet port setting of primary shielding gas is on the upper portion of the even pressure chamber of admitting air, the even air feed of the axial forward flow way and axial back flow way will be nature to the gas in the even pressure chamber of admitting air.
2. The primary gas protection device for narrow-gap MAGMIG automatic welding of claim 1, wherein the front and rear flow equalizing nozzles comprise nozzle bodies, gas inlet structures, contact tip attaching structures, positioning rail grooves and flow equalizing cavities, the gas inlet structures are connected with the protruding tube seats of the axial front flow channel and the axial rear flow channel, and the flow equalizing cavities are arranged on two sides of the contact tip attaching structures and used for reducing pressure and equalizing primary gas of the axial front flow channel and the axial rear flow channel and then sending the primary gas to a high-temperature protection area.
3. The primary gas protection device for narrow gap MAGMIG automatic welding of claim 2, wherein the contact tip attaching structure is a semicircular axial half groove, and is attached and positioned with a contact tip installed on a welding gun, and the positioning rail groove is a rectangular groove and is connected with a positioning rail on a welding gun seat.
4. The narrow gap MAGMIG automatic welding primary gas protection device according to claim 1, wherein the minimum diameter of the gas inlet uniform pressure cavity is larger than the sum of the center distance of the front gas flow passage and the rear gas flow passage and the diameter of any one gas flow passage.
5. The narrow gap MAGMIG automatic welding primary gas protection device according to claim 1, wherein said diverter body is designed as a solid of revolution structure.
6. The primary gas shield apparatus for narrow gap MAGMIG automatic welding of claim 1, wherein the volume of said inlet plenum chamber is proportional to the maximum flow rate of the primary shielding gas, and when the volume of the plenum chamber is cubic millimeter and the maximum flow rate of the primary shielding gas is liter/minute, the ratio of the volume of the inlet plenum chamber to the maximum flow rate of the primary shielding gas is 280-300.
7. A primary gas protection arrangement for narrow gap magmigig automatic welding according to claim 1 wherein said post gas splitter is mounted in a post position, i.e. in a welding torch seating position which does not enter the welding gap, said post gas splitter being threadably or brazing connected to the welding torch seating.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111668979.6A CN114226934A (en) | 2021-12-31 | 2021-12-31 | Primary gas protection device for narrow-gap MAG/MIG automatic welding |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111668979.6A CN114226934A (en) | 2021-12-31 | 2021-12-31 | Primary gas protection device for narrow-gap MAG/MIG automatic welding |
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Citations (9)
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|---|---|---|---|---|
| RU2023555C1 (en) * | 1991-04-17 | 1994-11-30 | Институт Электросварки Им.Е.О.Патона | Gas-shielded arc torch |
| JPH0857652A (en) * | 1994-08-23 | 1996-03-05 | Mitsubishi Heavy Ind Ltd | Shield nozzle for narrow gap welding |
| WO2012076750A1 (en) * | 2010-12-07 | 2012-06-14 | Aalto University Foundation | Narrow gap mig/mag welding torch |
| CN104096956A (en) * | 2014-07-23 | 2014-10-15 | 武汉纳瑞格智能设备有限公司 | Gas distributing device for narrow-gap/ultra-narrow gap welding gun |
| CN104923891A (en) * | 2015-06-26 | 2015-09-23 | 武汉纳瑞格智能设备有限公司 | Assembled ultra-narrow gap MAG/MIG welding insulating spray nozzle |
| CN105689849A (en) * | 2016-03-28 | 2016-06-22 | 武汉纳瑞格智能设备有限公司 | Gas distributing device for rear-mounted narrow gas/ultra-narrow gap gas shield welding gun |
| CN106270982A (en) * | 2016-09-23 | 2017-01-04 | 武汉纳瑞格智能设备有限公司 | A kind of overlength stagewise narrow gap gas protection weldering welding gun |
| CN108637440A (en) * | 2018-04-28 | 2018-10-12 | 武汉纳瑞格智能设备有限公司 | A kind of ultra-narrow gap MAG/MIG automatic welding gun metallic nozzles with ignition tip insulation |
| JP2019217545A (en) * | 2018-06-22 | 2019-12-26 | 株式会社Ihi | Component for tip, welding torch and welding method |
-
2021
- 2021-12-31 CN CN202111668979.6A patent/CN114226934A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2023555C1 (en) * | 1991-04-17 | 1994-11-30 | Институт Электросварки Им.Е.О.Патона | Gas-shielded arc torch |
| JPH0857652A (en) * | 1994-08-23 | 1996-03-05 | Mitsubishi Heavy Ind Ltd | Shield nozzle for narrow gap welding |
| WO2012076750A1 (en) * | 2010-12-07 | 2012-06-14 | Aalto University Foundation | Narrow gap mig/mag welding torch |
| CN104096956A (en) * | 2014-07-23 | 2014-10-15 | 武汉纳瑞格智能设备有限公司 | Gas distributing device for narrow-gap/ultra-narrow gap welding gun |
| CN104923891A (en) * | 2015-06-26 | 2015-09-23 | 武汉纳瑞格智能设备有限公司 | Assembled ultra-narrow gap MAG/MIG welding insulating spray nozzle |
| CN105689849A (en) * | 2016-03-28 | 2016-06-22 | 武汉纳瑞格智能设备有限公司 | Gas distributing device for rear-mounted narrow gas/ultra-narrow gap gas shield welding gun |
| CN106270982A (en) * | 2016-09-23 | 2017-01-04 | 武汉纳瑞格智能设备有限公司 | A kind of overlength stagewise narrow gap gas protection weldering welding gun |
| CN108637440A (en) * | 2018-04-28 | 2018-10-12 | 武汉纳瑞格智能设备有限公司 | A kind of ultra-narrow gap MAG/MIG automatic welding gun metallic nozzles with ignition tip insulation |
| JP2019217545A (en) * | 2018-06-22 | 2019-12-26 | 株式会社Ihi | Component for tip, welding torch and welding method |
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