CN115815764B - Welding contact tip with gas distribution structure, contact tip gas distribution method and welding gun - Google Patents
Welding contact tip with gas distribution structure, contact tip gas distribution method and welding gun Download PDFInfo
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- CN115815764B CN115815764B CN202310017204.5A CN202310017204A CN115815764B CN 115815764 B CN115815764 B CN 115815764B CN 202310017204 A CN202310017204 A CN 202310017204A CN 115815764 B CN115815764 B CN 115815764B
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- 238000003466 welding Methods 0.000 title claims abstract description 105
- 238000000034 method Methods 0.000 title claims abstract description 10
- 230000001681 protective effect Effects 0.000 claims abstract description 55
- 239000000919 ceramic Substances 0.000 claims description 21
- 239000012528 membrane Substances 0.000 claims description 19
- 238000001816 cooling Methods 0.000 claims description 15
- 238000004804 winding Methods 0.000 claims description 14
- 239000002184 metal Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 238000010891 electric arc Methods 0.000 claims description 3
- 239000004744 fabric Substances 0.000 abstract description 7
- 239000007789 gas Substances 0.000 description 107
- 238000005516 engineering process Methods 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 229910000881 Cu alloy Inorganic materials 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000004020 conductor Substances 0.000 description 2
- 229910003460 diamond Inorganic materials 0.000 description 2
- 239000010432 diamond Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000015111 chews Nutrition 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
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Abstract
The invention discloses a welding conducting nozzle with a gas distribution structure, a gas distribution method of the conducting nozzle and a welding gun, and relates to the technical field of gas welding. Through set up the cloth balloon on the reposition of redundant personnel body right side for perpendicular striking can not take place when protection gas passes through the cloth balloon, can also shunt from gas supply pipe spun protection gas through the guiding gutter on the cloth balloon, make protection gas enter into the gas pocket of cloth balloon fast, after protection gas passes through the cloth balloon, protection gas can follow the cavity of sharp entering sheath, evenly distributed is in the cavity of sheath, and the back is quick from the left opening blowout of sheath, forms the protection atmosphere around the welding point of work piece. No additional pressure or additional shielding gas is required to be provided, and the shielding gas in the sheath is pushed to quickly form a protective atmosphere around the welding point.
Description
Technical Field
The invention relates to the technical field of gas welding, in particular to a welding conducting nozzle with a gas distribution structure.
Background
The welding contact tip structure used for MIG welding is shown in fig. 1, and includes a neck 1, a shunt 2, a contact tip 3 and a tube sleeve 4, wherein the tube sleeve 4 surrounds the shunt 2 and the contact tip 3, and a welding wire 100 passes through a wire feeding hole 5 of the neck 1 and the shunt 2 and then passes out of the contact tip 3, and the shunt 2 adopts a radial hole 6 as an output hole of shielding gas (inert gas).
When MIG welding is performed, the conventional welding contact tip is configured such that the shielding gas flows out from the gas supply pipe of the neck 1, is ejected from the radial hole 6 after passing through the wire feed hole 5, and is pushed around the welding point to form a protective atmosphere, thereby protecting the welding point from the oxidation interference of the atmosphere. And then, the current for welding flows to the conductive nozzle 3, the current is sent to the welding wire 100 which is continuously extended from the conductive nozzle 3 through the conductive nozzle 3, the charged welding wire 100 is contacted with a charged workpiece to be welded, and electric arc and high heat are generated to melt the welding point of the welding wire 100 and the workpiece so as to achieve the purpose of metal connection.
In the conventional MIG welding scheme, the shielding gas ejected from the radial holes 6 may collide with the inner wall of the tube sleeve 4 vertically, be refracted many times, and the partially refracted shielding gas may collide with the shielding gas ejected from the radial holes 6, so that irregular and mutually resistant vortex flows may be formed, which is disadvantageous for the flow rate of the shielding gas, and thus, the prior art often provides additional pressure to eliminate such disadvantageous effects, but this means that more shielding gas is consumed.
Disclosure of Invention
One of the purposes of the invention is to solve the problem that the prior art can generate vortex when the radial holes are adopted to spray the shielding gas, so as to influence the flow rate of the shielding gas, and additional pressure is needed to be provided to eliminate the influence of the flow rate of the shielding gas, so that more shielding gas is consumed.
The second object of the present invention is to provide a gas distribution method for a contact tip.
It is a further object of the present invention to provide a welding gun.
In order to achieve one of the above purposes, the present invention adopts the following technical scheme: the utility model provides a welding electric nozzle with cloth gas structure, includes body, branch fluid, leads and chews and the sheath, the body links to each other with the sheath, the branch fluid with lead and chew and link to each other, the branch body with lead and chew and all be located in the cavity of sheath, the branch body passes through cloth gas ring and connects the body.
The welding wire guiding device is characterized in that a wire feeding cavity is arranged in the tube body, an air supply pipe is connected in the wire feeding cavity, a boring hole communicated with the wire feeding cavity is formed in the split body, a wire feeding hole communicated with the boring hole is formed in the guide nozzle, the wire feeding cavity, the boring hole and the wire feeding hole are coaxial, and the wire feeding cavity, the boring hole and the wire feeding hole are all used for guiding out welding wires.
The gas distribution ring is sleeved on the outer wall of the split flow body, the outer wall of the gas distribution ring is tightly attached to the inner wall of the cavity of the sheath, the gas distribution ring is provided with guide grooves, the guide grooves are distributed in a ring shape, the two ends of the guide grooves are different in height, the guide grooves form an inclined structure, a plurality of air holes are formed in the guide grooves, and the wire inlet cavity is communicated with the air holes through the guide grooves.
In the technical scheme, when welding is needed, the protective gas is sent out through the air supply pipe in the pipe body, moves along the left side of the wire feeding cavity and contacts with the air distribution ring.
The protective gas is guided by the inclined guide groove in the air distribution ring, one end with low depth of the guide groove receives impact from the protective gas, and the protective gas is easily diffused into one end with high depth of the guide groove along the one end with low depth of the guide groove due to the low depth of the guide groove, so that the protective gas is rapidly distributed into air holes in the guide groove.
And then the protective gas is diffused to the cavity of the sheath along a straight line after passing through the air holes, and is sprayed out from the opening at the left side of the sheath, so that a protective atmosphere is formed around the welding point of the workpiece.
Further, in the embodiment of the invention, the split body is provided with an internal thread, the guide nozzle is provided with an external thread, and the internal thread of the split body is connected with the external thread of the guide nozzle to form threaded connection. Through the threaded connection, the broken guide nozzle can be conveniently replaced.
Further, in the embodiment of the present invention, the air distribution ring and the split body are in an integral structure, or the air distribution ring and the split body are detachably connected in a separated manner.
Further, in an embodiment of the present invention, the sheath includes a first cylindrical section and a second cylindrical section, a flow guiding cavity is formed between the first cylindrical section and the split body, and the gas distribution ring is located in the flow guiding cavity.
And an overflow gap is formed between the second cylindrical section and the split flow body, and the radial length of the overflow gap is smaller than that of the flow guiding cavity.
When the shielding gas enters the flow-through gap from the flow-guiding cavity, the radial length of the flow-through gap is smaller than that of the flow-guiding cavity, so that the flow speed of the shielding gas passing through the flow-through gap can be increased, and the shielding atmosphere can be formed at the welding point of the workpiece quickly.
Still further, in an embodiment of the present invention, the sheath further comprises a tapered section, the tapered section surrounding a left end portion of the nozzle. The sheath of the conical section can collect a beam of shielding gas around the weld of the workpiece, which can reduce the amount of shielding gas output.
Further, in the embodiment of the invention, a ceramic sleeve is installed in the boring hole, and the ceramic sleeve is provided with a shaft hole for the welding wire to pass through. The ceramic sleeve is made of high heat conduction materials such as polycrystalline diamond (PCD), silicon carbide (SiC) and the like. The heat of the guide nozzle can be effectively absorbed through the heat conducting and conducting material, and the guide nozzle is cooled. The ceramic sleeve also provides a guiding and securing action for the welding wire, which is a common solution in the prior art and is not described in detail here.
Still further, in an embodiment of the present invention, the boring hole is provided with a cooling hole that is communicated with the overcurrent gap or the diversion cavity, a permanent magnet and a fixing frame are installed in the boring hole, the permanent magnet is annular, a ring-shaped framework is slidingly connected to the fixing frame, the annular framework is located in a cavity of the permanent magnet, a winding coil is wound on the framework, and an elastic membrane is installed on the left side of the annular framework.
Because the guide nozzle needs to have good conductivity, the existing guide nozzle is mostly made of copper or copper alloy. When the guide nozzle is welded, the guide nozzle is easy to be heated and expanded, so that the guide nozzle becomes soft, the welding wire is not easy to be led out, the gap between the welding wire and the guide nozzle is about 0.3mm, friction is very easy to occur (so that blockage often occurs), and the guide nozzle is worn. Therefore, in order to ensure the service life of the guide nozzle and the efficiency, the heat dissipation of the guide nozzle cannot be abandoned, and the following scheme is adopted:
the winding coil in the guide body is electrified when the guide nozzle is electrified, so that the winding coil generates a magnetic field, the magnetic field interacts with a permanent magnet magnetic field surrounding the coil, the coil-shaped framework moves left and right along the axial direction with the coil and the elastic membrane, the elastic membrane drives air of a boring hole in the guide body, and finally the air of the boring hole is subjected to heat exchange with protective gas of an overflow gap or a guide cavity through a cooling hole under the driving of the elastic membrane, and the cooling ceramic sleeve absorbs heat to the guide nozzle (the cooling ceramic sleeve can indirectly cool the guide nozzle).
The beneficial effects of the invention are as follows:
according to the invention, the gas distribution ring is arranged on the right side of the gas distribution body, so that the protective gas can not vertically collide when passing through the gas distribution ring, the protective gas sprayed out of the gas supply pipe can be distributed through the diversion groove on the gas distribution ring, so that the protective gas can quickly enter the gas holes of the gas distribution ring, after passing through the gas distribution ring, the protective gas can linearly enter the cavity of the sheath, and is uniformly distributed in the cavity of the sheath (the protective gas is sprayed out of the gas holes to form a cone shape), and then is quickly sprayed out of the opening on the left side of the sheath, so that a protective atmosphere is formed around the welding point of the workpiece. No additional pressure or additional shielding gas is required to be provided, and the shielding gas in the sheath is pushed to quickly form a protective atmosphere around the welding point.
In addition, when the shielding gas enters the flow-through gap from the flow-guiding cavity, the radial length of the flow-through gap is smaller than that of the flow-guiding cavity, so that the flow speed of the shielding gas passing through the flow-through gap can be increased, and the shielding gas is favorable for forming a shielding atmosphere at the welding point of the workpiece.
In order to achieve the second purpose, the invention adopts the following technical scheme: a welding gun having the welding tip with a gas distribution structure as described in one of the above objects.
In order to achieve the third purpose, the invention adopts the following technical scheme: a contact tip gas distribution method applied to the welding contact tip with a gas distribution structure described in one of the above objects, the contact tip gas distribution method comprising the steps of:
when welding is needed, the protective gas is sent out through the air supply pipe in the pipe body, moves along the left side of the wire feeding cavity and contacts with the air distribution ring.
The protective gas is guided by the inclined guide groove in the air distribution ring, one end with low depth of the guide groove receives impact from the protective gas, and the protective gas is easily diffused into one end with high depth of the guide groove along the one end with low depth of the guide groove due to the low depth of the guide groove, so that the protective gas is rapidly distributed into air holes in the guide groove.
And then the protective gas is diffused to the cavity of the sheath along a straight line after passing through the air holes, and is sprayed out from the opening at the left side of the sheath, so that a protective atmosphere is formed around the welding point of the workpiece.
Further, in the embodiment of the invention, after a protective atmosphere is formed around the welding point of the workpiece, the pilot is electrified, so that the electrified welding wire is contacted with the electrified welded workpiece, and the welding point of the welding wire and the workpiece is melted by generating electric arc and high heat, thereby achieving the purpose of metal connection.
The winding coil in the guide body is electrified when the guide nozzle is electrified, so that the winding coil generates a magnetic field, the magnetic field interacts with a permanent magnet magnetic field around the coil, the coil-shaped framework carries the coil and the elastic membrane to move left and right along the axial direction, the elastic membrane further drives air of a boring hole in the guide body, and finally the air of the boring hole is subjected to heat exchange with protective gas of an overflow gap or a guide cavity through the cooling hole under the driving of the elastic membrane, and the ceramic sleeve and the guide nozzle are cooled.
Drawings
Fig. 1 is a schematic view of a structure of a welding contact tip in the prior art.
Fig. 2 is a schematic view of a welding contact tip according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of an air distribution ring according to an embodiment of the present invention.
FIG. 4 is a schematic view showing another structure of a welding contact tip according to an embodiment of the present invention
In the accompanying drawings
1. 2 parts of pipe neck, 2 parts of flow divider, 3 parts of conductive nozzle, 4 parts of pipe sleeve, 5 parts of wire feeding hole, 6 parts of radial hole;
10. the pipe body, 11, the wire feeding cavity, 12 and the air supply pipe;
20. the split flow body comprises a split flow body 21, a boring hole 22, a ceramic sleeve 23, a cooling hole 24, a permanent magnet 25, a fixing frame 26, a ring-shaped framework 27, a winding coil 28 and an elastic membrane;
30. a guide nozzle;
40. the sheath, 41, the first cylindrical section, 42, the second cylindrical section, 43, the diversion cavity, 44, the overflow gap, 45 and the conical section;
50. the air distribution ring is 51, the diversion trench is 52 and the air hole is formed;
100. and (5) welding wires.
Detailed Description
In order to make the objects, technical solutions, and advantages of the present invention more apparent, the embodiments of the present invention will be further described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are some, but not all, embodiments of the present invention, are intended to be illustrative only and not limiting of the embodiments of the present invention, and that all other embodiments obtained by persons of ordinary skill in the art without making any inventive effort are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "center," "middle," "upper," "lower," "left," "right," "inner," "outer," "top," "bottom," "side," "vertical," "horizontal," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "a," an, "" the first, "" the second, "" the third, "" the fourth, "" the fifth, "and the sixth" 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 explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
For purposes of brevity and description, the principles of the embodiments are described primarily by reference to examples. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the embodiments. However, it is apparent that. It will be apparent to one of ordinary skill in the art that the embodiments may be practiced without limitation to these specific details. In some instances, well-known contact tip air distribution methods and structures have not been described in detail to avoid unnecessarily obscuring such embodiments. In addition, all embodiments may be used in combination with each other.
Embodiment one:
the drawings of the specification are taken as the content of the specification, and the structural shapes, connection relationships, coordination relationships and positional relationships which can be obtained unambiguously in the drawings of the specification are understood as the content of the specification.
A welding conducting nozzle with an air distribution structure is shown in fig. 2, and comprises a pipe body 10, a split body 20, a guide nozzle 30 and a sheath 40, wherein the pipe body 10 is connected with the sheath 40, the split body 20 is connected with the guide nozzle 30, the split body 20 and the guide nozzle 30 are both positioned in a cavity of the sheath 40, and the split body 20 is connected with the pipe body 10 through an air distribution ring 50.
The pipe body 10 is provided with a wire feeding cavity 11, the wire feeding cavity 11 is internally connected with an air supply pipe 12, the split body 20 is provided with a boring 21 communicated with the wire feeding cavity 11, the guide nozzle 30 is provided with a wire feeding hole communicated with the boring 21, the wire feeding cavity 11, the boring 21 and the wire feeding hole are coaxial, and the wire feeding cavity 11, the boring 21 and the wire feeding hole are all used for guiding out the welding wire 100.
As shown in fig. 2 and 3, the air distribution ring 50 is sleeved on the outer wall of the split body 20, the outer wall of the air distribution ring 50 is tightly attached to the inner wall of the cavity of the sheath 40, the air distribution ring 50 is provided with guide grooves 51, the guide grooves 51 are distributed in a ring shape, two ends of the guide grooves 51 are different in height, the guide grooves 51 with an inclined structure are formed, a plurality of air holes 52 are formed in the guide grooves 51, and the wire inlet cavity 11 is communicated with the air holes 52 through the guide grooves 51.
The implementation steps are as follows: when welding is required, the protective gas is sent out through the air supply pipe 12 in the pipe body 10, moves along the left side of the wire feeding cavity 11 and contacts with the air distribution ring 50.
The protective gas is guided by the inclined guide groove 51 in the air distribution ring 50, and the end with low depth of the guide groove 51 receives the impact from the protective gas, so that the protective gas is easily diffused into the end with high depth of the guide groove 51 along the end with low depth of the guide groove 51 due to the low depth of the guide groove 51, and the protective gas is rapidly distributed into the air holes 52 in the guide groove 51.
After passing through the air holes 52, the protective gas is spread into the cavity of the sheath 40 along a straight line, and is ejected from the opening on the left side of the sheath 40, so as to form a protective atmosphere around the welding point of the workpiece.
According to the invention, the gas distribution ring 50 is arranged on the right side of the split body 20, so that the shielding gas cannot vertically collide when passing through the gas distribution ring 50, the shielding gas sprayed out of the gas supply pipe 12 can be split through the guide groove 51 on the gas distribution ring 50, so that the shielding gas can quickly enter the gas holes 52 of the gas distribution ring 50, after passing through the gas distribution ring 50, the shielding gas can linearly enter the cavity of the sheath 40, uniformly distributed into the cavity of the sheath 40 (the shielding gas is sprayed out of the gas holes 52 to form a cone shape), and then is quickly sprayed out of the opening on the left side of the sheath 40, and a shielding atmosphere is formed around the welding point of a workpiece. The protective atmosphere in the push sheath 40 quickly creates a protective atmosphere around the weld without the need to provide additional pressure and additional protective gas.
As shown in fig. 2, the split body 20 is provided with internal threads, the guide nozzle 30 is provided with external threads, and the internal threads of the split body 20 are connected with the external threads of the guide nozzle 30 to form threaded connection. By this threaded connection, it is possible to easily replace the worn out nozzle 30.
The air distribution ring 50 and the split body 20 are of an integrated structure, or the air distribution ring 50 and the split body 20 are detachably connected in a separated mode.
The sheath 40 includes a first cylindrical section 41 and a second cylindrical section 42, a flow guiding chamber 43 is formed between the first cylindrical section 41 and the split body 20, and the air distribution ring 50 is located in the flow guiding chamber 43.
As shown in fig. 2, an overflow gap 44 is formed between the second cylindrical section 42 and the split body 20, and the radial length of the overflow gap 44 is smaller than the radial length of the flow guiding cavity 43.
When the shielding gas enters the flow-through gap 44 from the flow-guiding cavity 43, the radial length of the flow-through gap 44 is smaller than that of the flow-guiding cavity 43, so that the flow speed of the shielding gas passing through the flow-through gap 44 can be increased, and the shielding atmosphere can be formed at the welding point of the workpiece quickly.
Sheath 40 also includes a tapered section 45, tapered section 45 surrounding the left end portion of nozzle 30. The sheath 40 of the tapered section 45 can collect a beam of shielding gas around the weld of the workpiece, which can reduce the amount of shielding gas output.
A ceramic sleeve 22 is mounted in the bore 21, and the ceramic sleeve 22 is provided with a shaft hole through which the welding wire 100 passes. The ceramic sleeve 22 is made of a high thermal conductivity material such as polycrystalline diamond (PCD), silicon carbide (SiC), or the like. The heat of the guide nozzle 30 can be effectively absorbed by the heat conducting and conducting material, so that the guide nozzle 30 is cooled. The ceramic sleeve 22 also provides a guiding and securing action for the welding wire 100, which is a common solution in the art and is not described in detail herein.
As shown in fig. 4, the bore 21 is provided with a cooling hole 23 communicated with an overflow gap 44 or a diversion cavity 43, a permanent magnet 24 and a fixing frame 25 are installed in the bore 21, the permanent magnet 24 is annular, a ring-shaped framework 26 is connected to the fixing frame 25 in a sliding manner, the annular framework is located in a cavity of the permanent magnet 24, a winding coil 27 is wound on the framework, and an elastic membrane 28 is installed on the left side of the annular framework.
Because of the need for a very good electrical conductivity of the guide tip 30, the guide tip 30 is made of copper or copper alloy. When the guide nozzle 30 is welded, the guide nozzle 30 is easily heated and expanded, so that the guide nozzle 30 becomes soft, which is unfavorable for guiding out the welding wire 100, and the gap between the welding wire 100 and the guide nozzle 30 is about 0.3mm, so that friction is extremely easy to occur (so that blockage is often caused), and the guide nozzle 30 is worn. Therefore, in order to ensure the service life of the guide nozzle 30 and the efficiency, the heat dissipation of the guide nozzle 30 cannot be abandoned, the following scheme is adopted:
the winding coil 27 in the guide body is electrified when the guide nozzle 30 is electrified, so that the winding coil 27 generates a magnetic field, the magnetic field interacts with the magnetic field of the permanent magnet 24 surrounding the coil, the annular framework 26 moves left and right along the axial direction with the coil and the elastic membrane 28, the elastic membrane 28 further drives the air of the boring 21 in the guide body, and finally the air of the boring 21 is subjected to heat exchange with the through-flow gap 44 or the shielding gas of the guide cavity 43 through the cooling hole 23 under the driving of the elastic membrane 28, the cooling ceramic sleeve 22 absorbs heat to the guide nozzle 30 (the ceramic sleeve 22 absorbs heat to the guide nozzle 30, and the cooling ceramic can indirectly cool the guide nozzle 30).
Embodiment two:
a welding gun having the welding tip with the gas distribution structure in the first embodiment.
Embodiment III:
the gas distribution method of the contact tip is applied to the welding contact tip with the gas distribution structure in the first embodiment, and comprises the following steps:
when welding is required, the protective gas is sent out through the air supply pipe 12 in the pipe body 10, moves along the left side of the wire feeding cavity 11 and contacts with the air distribution ring 50.
The protective gas is guided by the inclined guide groove 51 in the air distribution ring 50, and the end with low depth of the guide groove 51 receives the impact from the protective gas, so that the protective gas is easily diffused into the end with high depth of the guide groove 51 along the end with low depth of the guide groove 51 due to the low depth of the guide groove 51, and the protective gas is rapidly distributed into the air holes 52 in the guide groove 51.
After passing through the air holes 52, the protective gas is spread into the cavity of the sheath 40 along a straight line, and is ejected from the opening on the left side of the sheath 40, so as to form a protective atmosphere around the welding point of the workpiece.
When the shielding gas enters the flow-through gap 44 from the flow-guiding cavity 43, the radial length of the flow-through gap 44 is smaller than that of the flow-guiding cavity 43, so that the flow speed of the shielding gas passing through the flow-through gap 44 can be increased, and the shielding atmosphere can be formed at the welding point of the workpiece.
It is known that, in general, when welding, the button of the welding gun is turned on, and the welding is usually performed, for example, the protective atmosphere cannot be formed around the welding point quickly by the protective gas, which has an influence.
The existing MIG welding technology is adopted for welding test, and workpieces with the seam width of 16mm and the seam length of 173mm are welded: the material of the welding wire 100 is HS301, the diameter of the welding wire 100 is 1.6mm, the welding current is 280-300A, the arc voltage is 25-27V, the extension length of the welding wire 100 is 16-20mm, the welding speed is 201-350mm per minute, and the flow rate of the shielding gas is controlled to be 24-26L per minute.
When the MIG welding technology is adopted for welding tests, when the same parameters as those of the existing MIG welding technology are adopted, the high point of the welding point shielding gas flow is found, and then after the flow of the shielding gas is controlled to be about 20L per minute, the shielding gas flow of the welding point is found to be similar to that of the existing MIG welding technology, so that the shielding gas loss can be reduced by 12% per minute by adopting the method.
After a protective atmosphere is formed around the welding point of the workpiece, the pilot 30 is energized to bring the charged welding wire 100 into contact with the charged workpiece to be welded, and an arc and high heat are generated to melt the welding point of the welding wire 100 and the workpiece, so as to achieve the purpose of metal connection.
Because of the need for a very good electrical conductivity of the guide tip 30, the guide tip 30 is made of copper or copper alloy. When the guide nozzle 30 is welded, the guide nozzle 30 is easily heated and expanded, so that the guide nozzle 30 becomes soft, which is unfavorable for guiding out the welding wire 100, and the gap between the welding wire 100 and the guide nozzle 30 is about 0.3mm, so that friction is extremely easy to occur (so that blockage is often caused), and the guide nozzle 30 is worn. Therefore, in order to ensure the service life of the guide nozzle 30 and the efficiency, the heat dissipation of the guide nozzle 30 cannot be abandoned, the following scheme is adopted:
the winding coil 27 in the guide body is electrified when the guide nozzle 30 is electrified, so that the winding coil 27 generates a magnetic field, the magnetic field interacts with the magnetic field of the permanent magnet 24 surrounding the coil, the annular framework 26 moves left and right along the axial direction with the coil and the elastic membrane 28, the elastic membrane 28 further drives the air of the boring 21 in the guide body, and finally the air of the boring 21 is subjected to heat exchange with the through-flow gap 44 or the shielding gas of the guide cavity 43 through the cooling hole 23 under the driving of the elastic membrane 28, the cooling ceramic sleeve 22 absorbs heat to the guide nozzle 30 (the ceramic sleeve 22 absorbs heat to the guide nozzle 30, and the cooling ceramic can indirectly cool the guide nozzle 30).
While the foregoing describes the illustrative embodiments of the present invention so that those skilled in the art may understand the present invention, the present invention is not limited to the specific embodiments, and all inventive innovations utilizing the inventive concepts are herein within the scope of the present invention as defined and defined by the appended claims, as long as the various changes are within the spirit and scope of the present invention.
Claims (6)
1. The welding conducting nozzle with the gas distribution structure comprises a pipe body, a split body, a conducting nozzle and a sheath, wherein the pipe body is connected with the sheath, the split body is connected with the conducting nozzle, and the split body and the conducting nozzle are both positioned in a cavity of the sheath;
the pipe body is internally provided with a wire feeding cavity, the wire feeding cavity is internally connected with an air supply pipe, the split flow body is internally provided with a boring hole communicated with the wire feeding cavity, the guide nozzle is internally provided with a wire feeding hole communicated with the boring hole, the wire feeding cavity, the boring hole and the wire feeding hole are coaxial, and the wire feeding cavity, the boring hole and the wire feeding hole are all used for guiding out welding wires;
the air distribution ring is sleeved on the outer wall of the split flow body, the outer wall of the air distribution ring is tightly attached to the inner wall of the cavity of the sheath, the air distribution ring is provided with guide grooves, the guide grooves are distributed in a ring shape, the two ends of the guide grooves are different in height to form the guide grooves with inclined structures, a plurality of air holes are formed in the guide grooves, and the wire inlet cavity is communicated with the air holes through the guide grooves;
the sheath comprises a first cylindrical section and a second cylindrical section, a diversion cavity is formed between the first cylindrical section and the split flow body, and the gas distribution ring is positioned in the diversion cavity;
an overcurrent gap is formed between the second cylindrical section and the split flow body, and the radial length of the overcurrent gap is smaller than that of the diversion cavity;
the boring hole is provided with a cooling hole communicated with the overcurrent gap or the diversion cavity, a permanent magnet and a fixing frame are installed in the boring hole, the permanent magnet is annular, a ring-shaped framework is connected to the fixing frame in a sliding manner, the ring-shaped framework is located in a cavity of the permanent magnet, a winding coil is wound on the framework, and an elastic membrane is installed on the left side of the ring-shaped framework;
the split body is provided with an internal thread, the guide nozzle is provided with an external thread, and the internal thread of the split body is connected with the external thread of the guide nozzle to form threaded connection.
2. The welding contact tip with gas distribution structure according to claim 1, wherein the gas distribution ring and the split body are of an integral structure or the gas distribution ring and the split body are detachably connected in a separated manner.
3. The welding tip with gas distribution structure of claim 1 wherein said sheath further comprises a tapered section, said tapered section surrounding a left end portion of said tip.
4. The welding contact tip with gas distribution structure according to claim 1, wherein a ceramic sleeve is installed in the bore hole, and the ceramic sleeve is provided with a shaft hole through which the welding wire passes.
5. A welding gun having a welding tip with a gas distribution structure as claimed in any one of claims 1 to 4.
6. A contact tip gas distribution method, characterized by being applied to the welding contact tip with gas distribution structure as set forth in any one of the above claims 1 to 4, comprising the steps of:
when welding is needed, the protective gas is sent out through the air supply pipe in the pipe body, moves along the left side of the wire feeding cavity and contacts with the air distribution ring;
the protective gas is guided by the inclined guide groove in the air distribution ring, and the end with low depth of the guide groove receives the impact from the protective gas, so that the protective gas is easy to diffuse into the end with high depth of the guide groove along the end with low depth of the guide groove due to the low depth of the guide groove, and the protective gas is quickly distributed into the air holes in the guide groove;
then, after passing through the air holes, the protective gas is linearly diffused into the cavity of the sheath, and is sprayed out from the opening at the left side of the sheath, so that a protective atmosphere is formed around the welding point of the workpiece;
after forming a protective atmosphere around the welding point of the workpiece, electrifying the guide nozzle to enable the electrified welding wire to be in contact with the electrified welded workpiece, generating electric arc and high heat to melt the welding point of the welding wire and the workpiece, so as to achieve the purpose of metal connection;
simultaneously, the winding coil in the current-guiding body is electrified, so that the winding coil generates a magnetic field, the magnetic field interacts with the magnetic field of the permanent magnet around the coil, the coil-shaped framework carries the coil and the elastic membrane to move left and right along the axial direction, the elastic membrane drives air of the boring hole in the current-guiding body, and finally the air of the boring hole exchanges heat with the overcurrent clearance or the protective gas of the current-guiding cavity through the cooling hole under the driving of the elastic membrane, and the ceramic sleeve and the current-guiding nozzle are cooled.
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| CN2670760Y (en) * | 2003-11-11 | 2005-01-12 | 济南派克焊接技术有限公司 | Self cooled and gas protecting welding gun with annular plastic coated melting electrode |
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| CN105382386A (en) * | 2015-12-24 | 2016-03-09 | 南通市电站阀门有限公司 | Air-cooled type automatic welding gun with bottom build up welding |
| CN108436237A (en) * | 2018-06-20 | 2018-08-24 | 青岛光峰自动化科技有限公司 | A kind of gas shield welding ignition tip |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2670760Y (en) * | 2003-11-11 | 2005-01-12 | 济南派克焊接技术有限公司 | Self cooled and gas protecting welding gun with annular plastic coated melting electrode |
| CN101844267A (en) * | 2010-06-07 | 2010-09-29 | 石建荣 | Long-acting electric conduction nozzle |
| CN105099122A (en) * | 2015-09-09 | 2015-11-25 | 华中科技大学 | Moving-magnet type long-stroke ultra-precision linear motion mechanism |
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| CN115815764A (en) | 2023-03-21 |
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