CN201609808U - Shielding gas dragging cover for variable-polarity plasma welding of magnesium alloy plate - Google Patents
Shielding gas dragging cover for variable-polarity plasma welding of magnesium alloy plate Download PDFInfo
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- CN201609808U CN201609808U CN2009202941165U CN200920294116U CN201609808U CN 201609808 U CN201609808 U CN 201609808U CN 2009202941165 U CN2009202941165 U CN 2009202941165U CN 200920294116 U CN200920294116 U CN 200920294116U CN 201609808 U CN201609808 U CN 201609808U
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- magnesium alloy
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- alloy plate
- water cooling
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Abstract
The utility model relates to a shielding gas dragging cover for variable-polarity plasma welding of a magnesium alloy plate, which is technically characterized in that the shielding gas dragging cover is provided with an inert gas delivery system and a circulating water cooling system; the inert gas delivery system blocks the contact of air with a molten pool in thermal state, thereby preventing metal in the molten pool from being oxidized under the condition of high temperature; and the circulating water cooling system not only can reduce the temperature of the shielding gas dragging cover to prevent the damage of the shielding gas dragging cover during welding, but also can block the oxidation of the molten pool as the molten pool is rapidly cooled due to high thermal conductivity of magnesium alloy and temperature reduction function of the circulating water cooling system.
Description
Technical field
The utility model relates to a kind of welding equipment, and the protection gas that relates to a kind of magnesium alloy plate Variable Polarity plasma welding in particular drags cover.
Technical background
Magnesium alloy is owing to have advantages such as specific strength height, little, the easy processing of density, good shock resistance and corrosion resistance, and is widely used in space flight, automobile, motorcycle and the electronic product, becomes the main direction of present non-ferrous metal research and development.Welding is the important means that forms structural member, and therefore the research to the magnesium alloy materials weldability has important in theory and engineering significance.Used multiple different welding method at the welding of magnesium alloy in recent years, TIG weldering, electron beam welding (Electron beamwelding, EBW), Laser Welding (Laser beam welding, LBW), (Friction stir welding FSW) all has the scientific research personnel to study to friction stir welding.But said method all can not effectively solve magnesium alloy have that fusing point is low, linear expansion coefficient and thermal conductivity factor height, cause magnesium alloy in welding process, to occur problems such as oxidizing fire, crackle and heat affected area be wide easily.
Simultaneously, in the process of welding because magnesium alloy thermal conductivity height, rapid heat dissipation, the protection gas of Variable Polarity plasma apparatus self can't be protected whole high-temperature region.When adopting front protecting gas, when unprotect gas dragged the cover protection, fillet in normal shear was narrow, and there is one deck black oxide film on the surface, the positive molten height of weld seam, and the back side is molten tall and big.The generation of oxide-film has destroyed the dynamic equilibrium of molten pool metal, orders about liquid metal and moves to back of weld, causes plate surface to fall into.
Summary of the invention
For addressing the above problem, the protection gas that the invention provides a kind of magnesium alloy plate Variable Polarity plasma welding drags cover, and wherein, this protection gas drags cover to comprise that gas hood, gas hood are provided with air inlet and gas outlet; Also be provided with return duct and recirculated water cooling pipe in the gas hood; Return duct is connected with air inlet, and the interface of recirculated water cooling pipe reaches outside the gas hood.
Described gas outlet is a grid, and its area and protection gas drag cover to equate with the entire contact surface between the weld seam is long-pending.
Described return duct is vertical with air inlet, parallel placement with the gas outlet, and the two ends of return duct are opening, and some apertures are arranged on its Guan Bi.
Described recirculated water cooling pipe is U-shaped, parallel placement with the gas outlet.
Described recirculated water cooling pipe ring is placed around return duct.The gas hood front portion is provided with the fixing card of welding gun.
Useful technique effect of the present utility model is: protection gas drags return duct of the interior installation of the air inlet of cover; when inertia protection gas enters gas hood at a relatively high speed; because the obstruction of return duct makes inertia protection gas produce and refluxes; reduce flowing velocity; the fully diffusion in protection gas drags the space of cover of inertia protection gas; formed like this atmosphere sectional area is designed gas outlet sectional area, makes the protection effect of inertia protection gas be improved.Protection gas drags and covers to such an extent that return duct can make and flows into to such an extent that inertia protection gas is subjected to hindering and makes air velocity reduce at a relatively high speed from air inlet; gas outlet at the protection gas hood forms and the equirotal protective atmosphere of gas outlet area; protective gas is fully used; simultaneously therefrom gas pressure and the density contrast outside the mind-set is less in the atmosphere that forms; reach desirable protection effect, effectively utilized inertia protection gas.Protection gas drags cover to be fixed on the welding gun, in the process that welding gun upwards welds, drags the inertia protection gas that flows out the cover to cover on the molten pool metal from protection gas, hinders air and contacts with the molten bath of hot state, so just prevents that the molten pool metal under the high temperature is oxidized.
Simultaneously, protection gas drags has installed circulating water cooling system in the cover, and this system not only can reduce the temperature that protection gas drags cover, the damage that makes protection gas drag cover in the process of welding.Drag the circulating water cooling system of cover also to have the function of the magnesium alloy plate cooling of many welding simultaneously.And out-of-date when protecting gas to drag cover to walk, because the thermal conductivity height of magnesium alloy and the cooling effect of circulating water cooling system, the molten bath has cooled down, and hinders the oxidation in molten bath by this kind mode.
Description of drawings
Fig. 1 drags the profile of cover for protection gas
In the accompanying drawing: 1 gas hood, 2 return ducts, the fixing card of 3 welding guns, 4 recirculated waters cooling pipe, 5 recirculated water conduits, 6 gas outlets, 7 air inlets.
Specific embodiment
The protection gas of magnesium alloy plate Variable Polarity plasma welding drags cover, and wherein, protection gas drags in the gas hood 1 of cover and is provided with protection gas induction system and circulating water cooling system.
Described protection gas induction system air inlet 7, return duct 2 and gas outlet 6 are formed, and described circulating water cooling system is made up of recirculated water cooling pipe 4 and recirculated water conduit 5.
The argon gas of employing 99.99% is protected gas as inertia, when argon gas flows into protection gas when dragging the gas hood 1 of cover at a relatively high speed from air inlet, in protection gas drags the air inlet of gas hood 1 of cover, a return duct 2 is installed, when argon gas enters protection gas when dragging the gas hood 1 of cover at a relatively high speed, because the obstruction of return duct 2 makes gas produce and refluxes, reduce flowing velocity, argon gas is fully diffusion in the space of gas hood 1; Formed like this atmosphere sectional area is designed gas outlet sectional area size, makes the protection effect of gas be improved.The obstruction of return duct 2 makes air velocity reduce; the gas outlet 6 of gas hood 1 forms and the equirotal protective atmosphere of gas outlet 6 areas; argon gas is fully used, and simultaneously therefrom gas pressure and the density difference outside the mind-set is less in the atmosphere that forms, and has effectively utilized argon gas.Protection gas drags cover to be fixed on the welding gun, and in the process that welding gun upwards welds, the argon gas that flows out from drag cover covers on the molten pool metal, hinders air and contacts with the molten bath of hot state, so just prevents that the molten pool metal under the high temperature is oxidized.
Simultaneously, in the gas hood 1 circulating water cooling system has been installed, this system not only can in the process of welding, reduce protection gas drag cover the temperature of gas hood 1, avoid the damage of gas hood 1.Drag the circulating water cooling system of cover also to have the function of lowering the temperature simultaneously to the magnesium alloy plate of welding.And it is out-of-date when protecting gas hood to walk; because the thermal conductivity height of magnesium alloy and the cooling effect of circulating water cooling system; the molten bath cools down substantially, has hindered at protection gas by this kind mode and has dragged cover to remove the back because the oxidation in the molten bath that the surplus temperature of solder joint causes has guaranteed welding quality.
Claims (6)
1. the protection gas of magnesium alloy plate Variable Polarity plasma welding drags cover, it is characterized in that: this protection gas drags cover to comprise that gas hood (1), gas hood (1) are provided with air inlet (7) and gas outlet (6); Also be provided with return duct (2) and recirculated water cooling pipe (4) in the gas hood (1); Return duct (2) is connected with air inlet (7), and the interface of recirculated water cooling pipe (4) reaches outside the gas hood (1).
2. the protection gas of magnesium alloy plate Variable Polarity plasma welding according to claim 1 drags cover, it is characterized in that: described gas outlet (6) are grid, and its area and protection gas drag cover to equate with the entire contact surface between the weld seam is long-pending.
3. the protection gas of magnesium alloy plate Variable Polarity plasma welding according to claim 1 drags cover; it is characterized in that: described return duct (2) is vertical with air inlet (7); with the parallel placement in gas outlet (2), the two ends of return duct (2) are opening, and some apertures are arranged on its Guan Bi.
4. the protection gas of magnesium alloy plate Variable Polarity plasma welding according to claim 1 drags cover, it is characterized in that: described recirculated water cooling pipe (4) is for U-shaped, with the parallel placement in gas outlet (6).
5. the protection gas of magnesium alloy plate Variable Polarity plasma welding according to claim 1 drags cover, it is characterized in that: described recirculated water cooling pipe (4) is placed around return duct (2).
6. the protection gas of magnesium alloy plate Variable Polarity plasma welding according to claim 1 drags cover, it is characterized in that: gas hood (1) front portion is provided with the fixing card of welding gun (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202941165U CN201609808U (en) | 2009-12-25 | 2009-12-25 | Shielding gas dragging cover for variable-polarity plasma welding of magnesium alloy plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202941165U CN201609808U (en) | 2009-12-25 | 2009-12-25 | Shielding gas dragging cover for variable-polarity plasma welding of magnesium alloy plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201609808U true CN201609808U (en) | 2010-10-20 |
Family
ID=42960441
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202941165U Expired - Lifetime CN201609808U (en) | 2009-12-25 | 2009-12-25 | Shielding gas dragging cover for variable-polarity plasma welding of magnesium alloy plate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201609808U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103302378A (en) * | 2012-03-15 | 2013-09-18 | 中国钢铁股份有限公司 | Welding jig |
| CN104096944A (en) * | 2014-07-09 | 2014-10-15 | 张家港市顺佳隔热技术有限公司 | Air protection cover for cutting machining |
| CN105290571A (en) * | 2015-11-17 | 2016-02-03 | 沈阳黎明航空发动机(集团)有限责任公司 | Manual welding device and method for barrel and mounting edge of thin-wall casing |
| CN105598562A (en) * | 2014-11-20 | 2016-05-25 | 中国人民解放军装甲兵工程学院 | A protection device and method for titanium and titanium alloy additive manufacturing based on a welding process |
-
2009
- 2009-12-25 CN CN2009202941165U patent/CN201609808U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103302378A (en) * | 2012-03-15 | 2013-09-18 | 中国钢铁股份有限公司 | Welding jig |
| CN104096944A (en) * | 2014-07-09 | 2014-10-15 | 张家港市顺佳隔热技术有限公司 | Air protection cover for cutting machining |
| CN105598562A (en) * | 2014-11-20 | 2016-05-25 | 中国人民解放军装甲兵工程学院 | A protection device and method for titanium and titanium alloy additive manufacturing based on a welding process |
| CN105598562B (en) * | 2014-11-20 | 2017-11-10 | 中国人民解放军装甲兵工程学院 | Protection device and method for the titanium or titanium alloy increasing material manufacturing based on welding procedure |
| CN105290571A (en) * | 2015-11-17 | 2016-02-03 | 沈阳黎明航空发动机(集团)有限责任公司 | Manual welding device and method for barrel and mounting edge of thin-wall casing |
| CN105290571B (en) * | 2015-11-17 | 2018-01-16 | 沈阳黎明航空发动机(集团)有限责任公司 | A kind of Thin-Wall Outer Casing cylinder and the Manual welding device and method on installation side |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20101020 |
|
| CX01 | Expiry of patent term |