CN106808070A - A kind of oil tank of transformer copper coin welding method - Google Patents
A kind of oil tank of transformer copper coin welding method Download PDFInfo
- Publication number
- CN106808070A CN106808070A CN201710211928.8A CN201710211928A CN106808070A CN 106808070 A CN106808070 A CN 106808070A CN 201710211928 A CN201710211928 A CN 201710211928A CN 106808070 A CN106808070 A CN 106808070A
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- China
- Prior art keywords
- welding
- copper coin
- copper
- gas
- welding method
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- B23K9/173—Arc welding or cutting making use of shielding gas and of a consumable electrode
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/302—Cu as the principal constituent
-
- 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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/38—Selection of media, e.g. special atmospheres for surrounding the working area
- B23K35/383—Selection of media, e.g. special atmospheres for surrounding the working area mainly containing noble gases or nitrogen
-
- 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
- B23K9/0026—Arc welding or cutting specially adapted for particular articles or work
- B23K9/0043—Locally welding a thin plate to a thick piece
-
- 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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/18—Dissimilar materials
- B23K2103/22—Ferrous alloys and copper or alloys thereof
Abstract
The invention provides a kind of oil tank of transformer copper coin welding method; the method uses the gaseous mixture of argon gas and helium as protection gas; copper coin and steel fuel tank are welded using gas metal-arc welding; copper coin or steel fuel tank need not be preheated; welding operation can advantageously be performed; and weldquality is good, deformation of products amount is small.
Description
Technical field
The present invention relates to steel and the method for copper material welding, more particularly to a kind of welding method of oil tank of transformer copper coin.
Background technology
Oil tank of transformer is case structure, and box portion is made up of bottom, tank wall, case lid, as shown in figure 1, material is general
It is carbon steel sheet and low magnetic sheet.In the process of running, fuel tank internal will produce magnetic field for transformer and fuel tank, therefore, general in fuel tank
Welding equipment copper coin is with armoured magnetic field at tank wall, case lid, as shown in Figure 2.
However, being welded between copper coin and copper coin, copper coin and welding box body are a technical barriers：First, from welding method
In selection, in structural member manufacturer, conventional welding method has SMAW, gas tungstun arc welding, consumable electrode gas
Body protection weldering, wherein, carry out copper coin welding using SMAW, will easily produce the defects such as stomata, crackle, appearance of weld compared with
Difference, and operation difficulty is big, using gas tungstun arc welding, because the general electric current of gas tungstun arc welding is relatively low, arc voltage is low,
Therefore welded for copper coin, it is difficult to molten bath is formed, additionally, low for structural member production efficiency using gas tungstun arc welding
Under.
Therefore, a kind of small oil tank of transformer copper coin welding method of easy to operate, welding deformation of exploitation is needed badly.
The content of the invention
In order to solve the above problems, present inventor has performed studying with keen determination, as a result find：Use the mixing of argon gas and helium
Gas is welded, it is not necessary to copper coin or steel using gas metal-arc welding as protection gas to copper coin and steel fuel tank
Liquefaction case is preheated, and can advantageously perform welding operation, and weldquality is good, and deformation of products amount is small, so as to complete this
Invention.
It is an object of the invention to provide a kind of oil tank of transformer copper coin welding method, it is characterised in that the method is used
The gaseous mixture of argon gas and helium is welded using gas metal-arc welding as protection gas to copper coin and steel fuel tank, excellent
Selection of land, the wherein cumulative volume based on argon gas Yu helium, argon gas volume fraction are 20%~40%.
Brief description of the drawings
Fig. 1 shows the external structure schematic diagram of oil tank of transformer；
Fig. 2 shows oil tank of transformer internal structure schematic diagram；
Fig. 3 shows the generalized section of fillet welding crack structure；
Fig. 4 shows angle welding structure top view, i.e. M direction views；
Fig. 5 shows the generalized section of butt weld structure；
Fig. 6 shows the top view of butt weld structure, i.e. N direction views；
Fig. 7 shows the generalized section of plug welding structure；
Fig. 8 shows the top view of plug welding structure, i.e. P direction views.
Drawing reference numeral explanation：
The case lid of 1- oil tank of transformer
The tank wall of 2- oil tank of transformer
The tank wall of 3- oil tank of transformer
The copper coin that 4- is welded with oil tank of transformer
5- plug welding welding holes
6- butt welds
7- corner connection weld seams
8- transformer oil box body steel plates
Specific embodiment
Below by the present invention is described in detail, the features and advantages of the invention will become more with these explanations
For clear, clear and definite.
Special word " exemplary " means " being used as example, embodiment or illustrative " herein.Here as " exemplary "
Illustrated any embodiment should not necessarily be construed as preferred or advantageous over other embodiments.Although each of embodiment is shown in the drawings
In terms of kind, but unless otherwise indicated, it is not necessary to accompanying drawing drawn to scale.
In the description of the invention, it is necessary to explanation, term " on ", D score, " interior ", " outward ", "front", "rear", " left side "
The orientation or position relationship of instructions such as " right sides " are based on the orientation or position relationship under working condition of the present invention, merely to just
Described in the description present invention and simplifying, rather than indicate imply signified device or element must have specific orientation, with
Specific azimuth configuration and operation, therefore be not considered as limiting the invention.Additionally, term " first ", " second ", "
Three " and " the 4th " be only used for describe purpose, and it is not intended that indicate or imply relative importance.
The present invention described below.
When being welded to copper and steel, generally from the semi-automatic consumable electrode gas-arc using pure argon as protection gas
Weldering, however, being still present when using the semi-automatic gas metal-arc welding welding equipment copper coin using pure argon as protection gas following
Difficult point：
(1) thermal conductivity of copper is bigger than iron 7 times at 20 DEG C, big 11 times at 1000 DEG C.Heat easily dissipates when copper coin is welded,
Increase heated perimeter, weld zone is difficult to reach fusion temperature, therefore, weldering before generally require copper coin or casing are preheating to it is higher
Temperature；
(2) as described in (1), copper coin or casing are heated to welding again after higher temperature, serious welding will be produced to become
Shape, especially for the welding of copper coin and tank wall, in addition to the weld seam of welding copper coin surrounding, copper coin will also carry out plug welding with tank wall,
As shown in figure 3, accordingly, it would be desirable to the position for being preheated and being welded is more, more increasing fuel tank tank wall and becoming with the welding of copper coin
Shape, is subsequently difficult to correct；
(3) even if using the method for weld preheating to higher temperature, when being welded, quality of weld seam molding is still very
Difference, and face of weld is pitch-black；
(4) it is that the weld penetration for being formed is shallower, lack of fusion, weld seam bearing capacity that copper coin welds another big difficult point
Difference.
According to the present invention, there is provided a kind of oil tank of transformer copper coin welding method, it is characterised in that the method using argon gas and
The gaseous mixture of helium is welded using gas metal-arc welding as protection gas to copper coin and steel fuel tank.
In the present invention, in the gaseous mixture of argon gas and helium, the cumulative volume based on argon gas Yu helium, wherein argon gas volume
Fraction is 20%~40%, preferably 25%~35%, most preferably 30%.
The inventors discovered that, under same weld electric current, the power of heliarc, penetration power are stronger than argon arc a lot, therefore, can obtain
Larger fusion penetration is obtained, however, simple helium is poor to the protecting effect in molten bath, and the effect of isolation air is also poor, therefore, easily
Cause the weld defect such as stomata that splashes and easily produce, and in working as mixed gas, when argon gas volume fraction is 20%~40%, especially
It is that, at 30%, under the effect of identical welding current, the electric arc as produced by gaseous mixture is moderate, has both shown the molten of helium
Permeability is acted on, and with the stability characteristic (quality) of argon gas electric arc.
The present inventors have additionally discovered that, the protection gas only specifically for argon gas and helium mix gas, and, based on argon gas and helium
Cumulative volume, when wherein argon gas volume fraction is 20%~40%, described technique effect can be reached, and use other to plant
The gaseous mixture of the gaseous mixture, carbon dioxide and helium of the mixed gas of class, such as carbon dioxide and argon gas, or argon in gaseous mixture
When the volume fraction of gas is not in the scope, described technique effect can not be reached.
In the present invention, in welding, argon gas is 15L/min~25L/min with the throughput of helium mix gas, preferably
It is 18L/min~20L/min.
The inventors discovered that, when throughput is less than 15L/min, protective gas is not good to molten bath protecting effect during welding,
And insufficient (incomplete) penetration, causes welding quality to reduce, when throughput is more than 25L/min, throughput is excessive, easily causes welding and lacks
Fall into, such as stomata, welding bead blow, and throughput can either provide enough fusion penetrations in 15L/min~25L/min, while
Weld defect can be avoided.
In the present invention, the copper coin of welding is brass copper coin, bronze copper coin and fine copper copper coin.
The inventors discovered that, doped with other metals in brass and bronze, i.e. the impurity content for containing is higher, in weldering
Easily melted when connecing, it is easy to weld, and the impurity in fine copper is few, it is difficult fusing in welding, and fine copper plasticity is higher, welding
When be more prone to welding deformation.Therefore, it is difficult between fine copper copper coin or fine copper copper coin and steel plate using conventional method
Material is welded, and is applicable not only to brass copper coin, bronze copper coin using the method that the present invention is provided, and applies also for fine copper copper
Plate.
In the present invention, the thickness of the copper coin of welding is 2~8mm, preferably 3~6mm.The inventors discovered that, if copper
Plate thickness is excessively thin, and copper coin flatness cannot ensure, and cannot play the effect of good armoured magnetic field；If copper plate thickness is more than 8mm,
Manufacturing cost will be increased, while in copper coin welding process, if do not carry out preheating copper coin to be still difficult to melt, if preheating will produce compared with
Big welding deformation amount.
In the present invention, it is carbon steel sheet or is low magnetic steel plate for manufacturing the sheet material of the casing, in the present invention, institute
It refers to iron-carbon alloy of the phosphorus content less than 2.11% to state carbon steel sheet；The low magnetic steel plate refers to the inductionless steel plate of ferromagnetism.
In the present invention, the equipment for being used in welding is semi-automatic gas metal-arc welder, described semi-automatic molten
Change pole gas shielded welding machine include hand-held welding gun, wherein, the welding gun can in welding process automatic feed welding wire, preferably
Ground, the speed that welding wire is sent into is 240~400mm/min, preferably 280~320mm/min.
In the present invention, described welding gun has following design feature.The pipette tips part of the welding gun is main by hand-held
(pikestaff), elbow, insulation sleeve, connecting rod, ignition tip, protective case etc. are constituted, by wire feed flexible pipe, tracheae and tracheae behind pipette tips
The copper lines and insulating gum cover of outer wrapping are constituted；In welding process, copperwelding rod is sent into pipette tips part by wire feed flexible pipe, then by
Pipette tips are sent to workpiece, while the mixed gas of argon gas and helium are fed through pipette tips part from tracheae, hence into welding wire
With the region to be welded of near workpieces, at this moment press hand-held upper touch switch, stabilization is just formed between workpiece and welding wire
Welding arc.
In the present invention, welding wire used is albronze welding wire, wherein, with the gross weight meter of welding wire, wherein, the weight of copper
Amount fraction is 79.38~94.5wt%, preferably 90.2~93wt%.
In the present invention, a diameter of Φ 1.2mm of welding wire used.
In the present invention, in welding, welding current is 180~280A, preferably 210~250A.
The inventors discovered that, using above-mentioned certain material, the welding wire of special diameter, in above-mentioned wire travelling speed and welding electricity
Under stream, the operating condition of feeding wire speed, when being welded to copper coin and steel plate, without preheating, directly welded i.e.
The good weld seam in solderable formation surface, and copper coin and steel plate are substantially without deformation.
The method that the present invention is provided is applied to fillet welding between copper coin and steel plate, right between plug welding, and copper coin and copper coin
Connect weldering.
In the present invention, the fillet welding refers to be welded between copper coin edge and steel plate face, as shown in Figure 3 and Figure 4.
Especially, fillet welding can be carried out by following operation：First spot welding will be carried out between copper coin surrounding and steel plate to fix, to avoid welding
Copper coin is deformed in journey；During welding, welding gun is directed at copper coin and steel plate contact position such that it is able to make part fusing metal as far as possible
Enter into the gap of copper coin and steel plate, increase weld strength.
In the present invention, the plug welding refers to be filled weldering between the welding hole and steel plate face that will be opened up on copper coin, such as
Shown in Fig. 7 and Fig. 8.Especially, plug welding can be carried out by following operation：Welding gun is directed at the plug welding hole center starting the arc, after the starting the arc
Welding gun is enclosed along plug welding hole edge welding one, in the gap that make part fusing metal enter into copper coin and steel plate that can similarly try one's best,
Increase weld strength, welding gun is circumferentially welded in plug welding hole afterwards, until plug weld is highly not less than copper coin surface, plug welding
After end by weld grinding to copper coin flush.
In the present invention, the butt welding refer to two pieces of adjacent copper coins are integrally welded, as shown in Figure 5 and Figure 6.It is special
Not, butt welding can be carried out by following operation：It is similar with fillet welding, first will carry out a solid welding between the copper coin and steel plate of joint
It is fixed, it is deformed with copper coin in avoiding welding process；During welding, the unilateral copper coin of welding gun alignment angle together with the weldering of steel plate contact position
Weld seam, then be aligned another side copper plate welded again with steel plate contact position together with angle welding, similarly can as far as possible make part fusing metal
Enter into the gap of copper coin and steel plate, increase weld strength, afterwards that remaining non-welding zone domain weldering between two copper coins is full, butt welding
After end by weld grinding to copper coin flush.
In the present invention is a kind of preferred embodiment, the welding method is comprised the following steps：
Step 1, copper coin to be welded is positioned over the specified location in oil tank of transformer, is contacted with steel plate in copper coin surrounding
Position carries out spot welding and fixes；
Step 2, plug welding is carried out from copper coin center to edge, and in the present invention, the plug welding can be according to first center back edge
Order carry out successively；Also can be carried out according to the sequence interval of first center back edge, remaining welding hole is then carried out into plug welding again；
When there is polylith copper coin to need butt welding, the copper coin for being preferably first pointed to centre position carries out plug welding；
Two pieces of adjacent copper coins are carried out butt welding by step 3；
Repeat the above steps 2 and step 3, until all copper coins complete plug welding and butt welding；
Step 4, fillet welding is carried out to copper coin and steel plate.
According to the oil tank of transformer copper coin welding method that the present invention is provided, have the advantages that：
(1) the method uses semi-automatic gas metal-arc welding, wherein, welding wire used is the copper of Φ 1.2mm diameters
Welding wire, welding efficiency is high, and man-hour used is only 10% or so of conventional method；
(2) protective gas is the mixed gas of argon gas and helium, obtains larger fusion penetration in welding, and taken into account helium
The penetration of gas and the arc stability characteristic of argon gas；
(3) the method weldering before without preheating, can direct welding at normal temperatures, substantially reduce the deformation of copper coin and casing
Amount, under the same conditions, the deformation quantity produced after the welding of traditional pre-heating mean is about 20mm or so, and the method that the present invention is provided
The deformation quantity produced after welding is only 3~5mm or so；
(4) the method weldering before without preheating, can direct welding at normal temperatures, significantly reduce complex operation degree, carry
Production efficiency high；
(5) the method is formed brazing seam surface aesthetic, light and spatter is less；
(6) the method is directly subjected to without the advance built-up welding on welding bead in welding.
The present invention has been described in detail above in association with specific embodiment and exemplary example, but these explanations are simultaneously
It is not considered as limiting the invention.It will be appreciated by those skilled in the art that without departing from the spirit and scope of the invention,
Various equivalencings, modification can be carried out to technical solution of the present invention and embodiments thereof or is improved, these each fall within the present invention
In the range of.Protection scope of the present invention is determined by the appended claims.
Claims (10)
1. a kind of oil tank of transformer copper coin welding method, it is characterised in that the method uses the gaseous mixture conduct of argon gas and helium
Protection gas, is welded using gas metal-arc welding to copper coin and steel fuel tank.
2. welding method according to claim 1, it is characterised in that in the gaseous mixture of argon gas and helium, based on argon gas
With the cumulative volume of helium, wherein argon gas volume fraction is 20%~40%.
3. welding method according to claim 1 and 2, it is characterised in that
The copper coin of welding is brass copper coin, bronze copper coin and fine copper copper coin；And/or
The thickness of the copper coin of welding is 2~8mm.
4. according to the welding method that one of claims 1 to 3 is described, it is characterised in that the sheet material for manufacturing the casing is
Carbon steel sheet is low magnetic steel plate.
5. according to the welding method that one of Claims 1 to 4 is described, it is characterised in that in welding the equipment that uses for half from
Dynamic gas metal-arc welder, the semi-automatic gas metal-arc welder includes hand-held welding gun, wherein, the welding gun
Can being capable of automatic feed welding wire in welding process.
6. according to the welding method that one of Claims 1 to 5 is described, it is characterised in that welding wire used is albronze welding wire,
Wherein, with the gross weight meter of welding wire, wherein, the weight fraction of copper is 79.38~94.5wt%, preferably 90.2~93wt%；
And/or
A diameter of Φ 1.2mm of welding wire used.
7. according to the welding method that one of claim 1~6 is described, it is characterised in that welding when, welding current be 180~
280A, preferably 210~250A.
8. according to the welding method that one of claim 1~7 is described, it is characterised in that the air-flow of argon gas and helium mix gas
It is 15L/min~25L/min to measure, preferably 18L/min~20L/min.
9. according to the welding method that one of claim 1~8 is described, it is characterised in that the welding method is comprised the following steps：
Step 1, copper coin to be welded is positioned over the specified location in oil tank of transformer, in copper coin surrounding and steel plate contact position
Spot welding is carried out to fix；
Step 2, plug welding is carried out from copper coin center to edge；
Two pieces of adjacent copper coins are carried out butt welding by step 3；
Repeat the above steps 2 and step 3, until all copper coins complete plug welding and butt welding；
Step 4, fillet welding is carried out to copper coin and steel plate.
10. welding method according to claim 9, it is characterised in that in step 2,
The plug welding is carried out successively according to the order of first center back edge；Or enter according to the sequence interval of first center back edge
OK, remaining welding hole is then carried out into plug welding again；And/or
When there is polylith copper coin to need butt welding, the copper coin for being preferably first pointed to centre position carries out plug welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710211928.8A CN106808070A (en) | 2017-04-01 | 2017-04-01 | A kind of oil tank of transformer copper coin welding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710211928.8A CN106808070A (en) | 2017-04-01 | 2017-04-01 | A kind of oil tank of transformer copper coin welding method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106808070A true CN106808070A (en) | 2017-06-09 |
Family
ID=59116422
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710211928.8A Pending CN106808070A (en) | 2017-04-01 | 2017-04-01 | A kind of oil tank of transformer copper coin welding method |
Country Status (1)
| Country | Link |
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| CN (1) | CN106808070A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107175422A (en) * | 2017-06-29 | 2017-09-19 | 蒂森克虏伯机场系统(中山)有限公司 | A kind of stainless steel track welding structure and its welding method |
| CN112665786A (en) * | 2020-12-09 | 2021-04-16 | 内蒙古第一机械集团股份有限公司 | Pressure-bearing deformation control method for heavy-load fuel tank |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107175422A (en) * | 2017-06-29 | 2017-09-19 | 蒂森克虏伯机场系统(中山)有限公司 | A kind of stainless steel track welding structure and its welding method |
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| CN112665786A (en) * | 2020-12-09 | 2021-04-16 | 内蒙古第一机械集团股份有限公司 | Pressure-bearing deformation control method for heavy-load fuel tank |
| CN112665786B (en) * | 2020-12-09 | 2023-10-03 | 内蒙古第一机械集团股份有限公司 | Control method for pressure-bearing deformation of heavy-load fuel tank |
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