CN107570839B - A kind of copper-tungsten dissimilar metal plate electric arc spot welding method - Google Patents
A kind of copper-tungsten dissimilar metal plate electric arc spot welding method Download PDFInfo
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- CN107570839B CN107570839B CN201710969089.6A CN201710969089A CN107570839B CN 107570839 B CN107570839 B CN 107570839B CN 201710969089 A CN201710969089 A CN 201710969089A CN 107570839 B CN107570839 B CN 107570839B
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Abstract
The invention belongs to dissimilar metal plate welding technology fields, and in particular to a kind of copper-tungsten dissimilar metal plate electric arc spot welding method.In order to solve to be attached using the prior art to copper sheet and tungsten plate in the tungsten plate operation of rolling, there are the complicated for operation and demanding problems of technique, and the invention discloses a kind of copper-tungsten dissimilar metal plate electric arc spot welding methods.The copper-tungsten dissimilar metal plate electric arc spot welding method includes step S1, carries out removing surface to copper sheet and tungsten plate respectively；Step S2 carries out overlap joint fixation to tungsten plate and copper sheet, and coats activating agent on copper sheet surface；Step S3 carries out spot welding to tungsten plate and copper sheet using TIG weld method and fixes.It using copper of the invention-tungsten dissimilar metal plate electric arc spot welding method, not only may be implemented to being connected and fixed between copper sheet and tungsten plate, but also can simplify operation and reduce technique requirement.
Description
Technical field
The invention belongs to dissimilar metal plate welding technology fields, and in particular to a kind of copper-tungsten dissimilar metal plate electric arc spot welding
Method.
Background technique
Recent years in order to which tungsten plate is rolled into ultra thin plate, needs to introduce traction during the rolling process in the industrial production
Plate, for providing the tractive force of forward movement during the rolling process for tungsten plate.Wherein, since the moulding of copper sheet is preferable, quilt
The towing plate of the tungsten plate operation of rolling is done in choosing.However, since copper and tungsten are in the physical properties such as fusing point, thermal conductivity and thermal expansion coefficient
Differ greatly, thus tungsten plate and copper sheet are directly welded to connect it is difficult.
Currently, mainly having diffusion welding (DW), soldering, active metal casting technique and plasma spray to copper-tungsten interconnection technique
It applies.When wherein, using diffusion welding (DW), need to add the metallic intermediate layer that can be dissolved each other with copper and tungsten respectively between two kinds of base materials,
Such as Ni, Cu-Mn alloy, Ti-Ni-Ti alloy, diffusion or interfacial reaction are occurred by metallic intermediate layer and base material, form solid solution
Body or interphase, to obtain the connector for reaching metallurgical bonding after cooling.When using soldering, need to add between two kinds of base materials
Add fusing point to be below the solder of copper and tungsten, such as Cu-Mn alloy or Ag-Cu alloy, the connection of copper and tungsten realized by solder,
In also need to apply certain pressure in brazing process, thus guarantee connection fastness.Using active metal casting technique
When, fine copper is cast in into tungsten surface first, then by electron beam welding, hot isostatic pressing weldering or soldering, completes the company of copper and tungsten
It connects.When using plasma spraying, depositing materials are heated to fusing using plasma jet or close to molten state, sprayed coating is being made
The method that protective layer is formed on product surface, wherein the coating of high quality needs to control porosity in coating, oxygen contains in order to obtain
Thermal stress in amount and preparation process.
Due in above-mentioned welding method or need to add middle layer or need to apply pressure or need pair
Porosity, oxygen content and thermal stress are controlled, in this way in the tungsten plate operation of rolling, if carrying out copper sheet and tungsten plate using the above method
Between connection, then there is the complicated for operation and demanding problem of technique.
Summary of the invention
In order to solve to be attached using the prior art to copper sheet and tungsten plate in the tungsten plate operation of rolling, there are complicated for operation
With the demanding problem of technique, the invention proposes a kind of copper-tungsten dissimilar metal plate electric arc spot welding methods.The copper-tungsten xenogenesis gold
Belong to plate electric arc spot welding method, specifically includes the following steps:
Step S1, the copper sheet and tungsten plate for treating connection carry out removing surface respectively, it are made to show metallic luster；
The copper sheet for completing removing surface and tungsten plate are carried out overlap joint fixation by step S2, and on the Free Surface of copper sheet
Coat one layer of activating agent；
Step S3 carries out putting solid welding between copper sheet and tungsten plate in the Free Surface side of copper sheet using TIG weld method
It is fixed.
Preferably, in the step S1, using the cleaning solution being made of the concentrated sulfuric acid, dilute hydrochloric acid and water to the surface of tungsten plate
It is cleaned；Wherein the volume ratio of the concentrated sulfuric acid, dilute hydrochloric acid and water is 10:10:80 in the cleaning solution.
It is further preferred that in the step S1, being carried out first by surface of the cleaning solution to tungsten plate repeatedly clear
It washes, scavenging period 10min, then the surface of tungsten plate is finally rinsed using acetone.
Preferably, in the step S1, it is polished first using surface of the coarse sandpaper to copper sheet, removes the oxygen on surface
Change film, then the surface of copper sheet is cleaned repeatedly using the dilute sulfuric acid that concentration is 10%, while by clear water to copper sheet
Surface is rinsed, and is finally finally rinsed using acetone to the surface of copper sheet.
Preferably, in the step S2, the activating agent selects SiO2。
Preferably, in the step S3, TIG weld parameter are as follows: between tungsten electrode and copper sheet surface distance be 2mm~
4mm, welding current value are 140A~170A, and inert gas selects argon gas, and gas flow is 10~15L/min, and the spot welding time is
3s~5s.
It is further preferred that in the step S3, TIG weld parameter are as follows: distance is between tungsten electrode and copper sheet surface
3mm, welding current value are 140A, and inert gas selects argon gas, gas flow 10L/min, and the spot welding time is 4s.
When connecing method using automatic activating-tungsten inert gas welding of the invention and being subjected to, have the advantages that
1, in the present invention, copper sheet and the progress spot welding of tungsten plate are fixed by carrying out activating flux TIG welding in copper sheet side
Connection, to realize to being quickly fixedly connected between copper sheet and tungsten plate.It is spread in the prior art in this way, not only eliminating and using
When weldering or soldering, the padding to filler so that it is domestic to simplify welding operation, and is reduced and is poured using active metal
Casting technology and when using plasma spraying, the requirement to welding procedure, that is, eliminate in welding process to the requirement of pressure and
Requirement to porosity, oxygen content and thermal stress improves operating efficiency to simplify operating procedure.
2, the match settings of welding parameter when in the present invention, by tungsten plate and copper sheet progress activity TIG spot-welded,
Such as by being selected to welding current value, so that tungsten plate is connected the pad obtained in welding point with copper sheet and be provided with very
Good tensile strength, and ensure that the integrated connection fastness of welding point, to meet copper sheet in the tungsten plate operation of rolling
Requirement as towing plate to tractive force.
Detailed description of the invention
Fig. 1 is the SEM image that copper tungsten joint is obtained in embodiment 1；
Fig. 2 is the SEM image that copper tungsten joint is obtained in embodiment 2；
Fig. 3 is the SEM image that copper tungsten joint is obtained in comparative example 1；
Fig. 4 is the SEM image that copper tungsten joint is obtained in comparative example 2；
Fig. 5 is the photo of copper tungsten connector after completing welding in comparative example 3；
Fig. 6 is the photo that copper tungsten connector fracture position in tensile test is obtained in embodiment 1；
Fig. 7 is the photo that copper tungsten connector fracture position in tensile test is obtained in embodiment 2；
Fig. 8 is the photo that copper tungsten connector fracture position in tensile test is obtained in comparative example 1；
Fig. 9 is the photo that copper tungsten connector fracture position in tensile test is obtained in comparative example 2.
Specific embodiment
It describes in detail in the following with reference to the drawings and specific embodiments to technical solution of the present invention.
Using copper of the invention-tungsten dissimilar metal plate electric arc spot welding method, the tool that copper sheet and tungsten plate are fixedly connected
Body step are as follows:
Step S1, the copper sheet and tungsten plate for treating connection carry out removing surface respectively, it are made to show metallic luster.
Preferably, in the present invention, it is carried out using surface of the cleaning solution being made of the concentrated sulfuric acid, dilute hydrochloric acid and water to tungsten plate
Cleaning.Wherein, the concentration of the concentrated sulfuric acid is 95%-97% in cleaning solution, and the concentration of dilute hydrochloric acid is 37%-38%, and the concentrated sulfuric acid,
The volume ratio of dilute hydrochloric acid and water is 10:10:80.
When carrying out removing surface to tungsten plate using cleaning solution, carried out repeatedly using surface of the above-mentioned cleaning solution to tungsten plate first
Cleaning, scavenging period 10min, oxide and its impurity to tungsten plate surface are cleared up.Then using acetone again to tungsten plate
Surface carry out final flushing, removal remains remaining cleaning solution.
Preferably, in the present invention, when cleaning to copper sheet, mechanical grinding, removal are carried out to the surface of copper sheet first
The oxidation film on copper sheet surface.It is polished repeatedly for example, by using coarse sandpaper copper sheet surface, is guaranteeing to remove oxide film dissolving in this way
In the case of, the influence to copper plate thickness size and surface geometric tolerance can be reduced.Then the dilute sulfuric acid for the use of concentration being 10%
The surface of copper sheet is cleaned repeatedly, while being rinsed by surface of the clear water to copper sheet, is completed to copper sheet remained on surface
The removal of oxide and other impurities.Finally the surface of copper sheet is finally rinsed using acetone, removal remains in copper sheet table
The dilute sulfuric acid in face.
The copper sheet for completing removing surface and tungsten plate are carried out overlap joint fixation, and copper sheet are placed upward by step S2, in copper
One layer of activating agent is coated on the Free Surface of plate.
Preferably, in the present invention, activating agent selects SiO2, and one is coated on the Free Surface of copper sheet by hairbrush
Layer active agent layer in homogeneous thickness.Wherein, the thickness of active agent coating is advisable with the metallic luster for hiding copper sheet surface just.
In addition, before carrying out the overlap joint between copper sheet and tungsten plate and fixing, it is ensured that mutually overlap surface between copper sheet and tungsten plate
Flatness, guarantee to complete between copper sheet and tungsten plate overlap joint it is fixed after, full contact state is between the two contact surface, to protect
The fastness connected between card copper sheet and tungsten plate.
Step S3 carries out putting solid welding between copper sheet and tungsten plate in the Free Surface side of copper sheet using TIG weld method
It is fixed.
Preferably, in the present invention, welding parameter when spot-welded is carried out to copper sheet and tungsten plate using TIG weld method
Are as follows: distance is 2mm~4mm between tungsten electrode and copper sheet surface, and welding current value is 140A~170A, and inert gas selects argon
Gas, gas flow are 10~15L/min, and the spot welding time is 3s~5s.
Embodiment 1, using copper of the invention-tungsten dissimilar metal plate electric arc spot welding method, to a thickness of 1mm fine copper plate and
It is fixed with a thickness of the pure tungsten plate progress overlapped points solid welding of 0.5mm.
Wherein, the trade mark of copper sheet is T1, and outer dimension is 100mm × 25mm；The trade mark of tungsten plate is W1, and outer dimension is
100mm×25mm.Select the cleaning solution and third as made of the concentrated sulfuric acid, dilute hydrochloric acid and the water proportional arrangement of 10:10:80 by volume
Ketone clears up tungsten plate surface；Coarse sandpaper, dilute hydrochloric acid, clear water and acetone is selected to clear up copper sheet surface.Copper sheet with
Amount of lap between tungsten plate is 25mm, and activating agent selects SiO2And coating surface product is 12 × 12mm2.TIG weld parameter is,
Welding current value is 140A, and the distance between the tungsten electrode of welding gun and copper sheet surface are 3mm, and inert gas selects argon gas, indifferent gas
The throughput of body is 10L/min, and the spot welding time is 4s.It completes welding and in air after natural cooling, obtains as shown in Figure 1
The SEM image of copper tungsten joint.
Embodiment 2, using method same as Example 1 to the fine copper plate with a thickness of 1mm and with a thickness of the pure tungsten of 0.5mm
It is fixed that plate carries out overlapped points solid welding.Its difference is only that welding current value is 170A, and after the completion of welding, obtains as shown in Figure 2
Copper tungsten joint SEM image.
Comparative example 1, using method same as Example 1 to the fine copper plate with a thickness of 1mm and with a thickness of the pure tungsten of 0.5mm
It is fixed that plate carries out overlapped points solid welding.Its difference is only that, does not coat activating agent on copper sheet surface, and after the completion of welding, obtain
The SEM image of copper tungsten joint as shown in Figure 3.
Comparative example 2, using method same as Example 1 to the fine copper plate with a thickness of 1mm and with a thickness of the pure tungsten of 0.5mm
It is fixed that plate carries out overlapped points solid welding.Its difference is only that welding current value is 110A, and after the completion of welding, obtains as shown in Figure 4
Copper tungsten joint SEM image.
Comparative example 3, using method identical with comparative example 2 to the fine copper plate with a thickness of 1mm and with a thickness of the pure tungsten of 0.5mm
It is fixed that plate carries out overlapped points solid welding.Its difference is only that, does not coat activating agent on copper sheet surface.As shown in connection with fig. 5, welding is completed
Afterwards, connection is not carried out between copper sheet and tungsten plate at all, i.e., at low current (110A), at all can not by activating agent
Realize the welded connecting between copper sheet and tungsten plate.
Next, carrying out pull test to copper tungsten connector is obtained in above-described embodiment and comparative example.Wherein, to break copper tungsten
Connector is standard, records the bonding strength of each copper tungsten connector.
Pull test is carried out to copper tungsten connector is obtained in embodiment 1, obtains copper tungsten joint breaking position as shown in FIG. 6
Photo, and value of thrust when copper tungsten joint breaking is 2.86KN.
Pull test is carried out to copper tungsten connector is obtained in embodiment 2, obtains copper tungsten joint breaking position as shown in Figure 7
Photo, and value of thrust when copper tungsten joint breaking is 2.48KN.
Pull test is carried out to copper tungsten connector is obtained in comparative example 1, obtains copper tungsten joint breaking position as shown in Figure 8
Photo, and value of thrust when copper tungsten joint breaking is 0.95KN.
Pull test is carried out to copper tungsten connector is obtained in comparative example 2, obtains copper tungsten joint breaking position as shown in Figure 9
Photo, and value of thrust when copper tungsten joint breaking is 0.87KN.
Referring to figs. 1 and 2, the copper tungsten joint performance obtained in embodiment 1 and embodiment 2 is identical, not only in copper
The junction at tungsten interface all has preferable compactness and low defect.In conjunction with shown in Fig. 6 and Fig. 7, embodiment 1 and embodiment 2
Position occurs for the middle fracture for obtaining copper tungsten connector all in the tungsten plate side at pad, illustrates that embodiment 1 and embodiment 2 obtain
The pad of copper tungsten connector all has preferable connectivity robustness.
Meanwhile the tensile fracture value of copper tungsten connector is 2.87KN in embodiment 1, copper tungsten connector is disconnected in example 2
Split value of thrust 2.48KN, the tensile fracture value of the two has reached 2KN or more, for a thickness of 1.0mm copper sheet and with a thickness of
There is very high tensile strength for the tungsten plate of 0.5mm.Therefore, it using the method for embodiment 1 and embodiment 2, can obtain
The good copper tungsten connector of pad connectivity robustness, and the integrated connection fastness of copper tungsten connector is also fine, has good
Tensile property.
Shown in comparison diagram 1 and Fig. 3, in the copper tungsten connector that obtains in embodiment 1, the junction at copper tungsten interface has preferable
Compactness and low defect；In the copper tungsten connector obtained in comparative example 1, there are more to lack for the junction at copper tungsten interface
It falls into.Illustrate in SiO2Under the booster action of activating agent, TIG electric welding is carried out to tungsten plate and copper sheet, better weldering can be obtained
Connect quality.
Shown in comparison diagram 6 and Fig. 8, it is at close pad that position, which occurs, for the fracture that copper tungsten connector is obtained in embodiment 1
Tungsten plate side, and it is directly at pad that position, which occurs, for the fracture that copper tungsten connector is obtained in comparative example 1, i.e., embodiment 1 obtains copper tungsten
Pad in connector has good connectivity robustness.Meanwhile the tensile fracture value of copper tungsten connector is in embodiment 1
2.87KN is 3 times of copper tungsten joint breaking value of thrust 0.95KN in comparative example 1.Therefore, the copper obtained using 1 method of embodiment
Tungsten connector not only has good pad connectivity robustness, but also the integrated connection fastness of copper tungsten connector is also very high.
Shown in comparison diagram 1 and Fig. 4, copper is obtained although being obtained in the copper tungsten interface and embodiment 1 of copper tungsten connector in comparative example 2
The copper tungsten interface of tungsten connector all has preferable compactness and low defect in junction, but copper tungsten connector in comparative example 2
Tensile fracture value there was only 0.87KN, the tensile fracture value 2.87KN of copper tungsten connector far smaller than in embodiment 1, illustrate using pair
The integrated connection fastness for the copper tungsten connector that the method for ratio 2 obtains is very poor.
In addition, as shown in connection with fig. 9, the fracture of copper tungsten connector occurs directly in weld locations, i.e. pad in comparative example 2
Fastness it is very low.Therefore, it is electric to be less than welding used in embodiment 1 for the welding current value (110A) used in the comparative example 2
When flow valuve (140A), reduced by the connectivity robustness that TIG spot-welded obtains pad in copper tungsten connector, and whole company
Fastness is connect also to be greatly lowered.
Claims (5)
1. a kind of copper-tungsten dissimilar metal plate electric arc spot welding method, which is characterized in that the welding method specifically includes the following steps:
Step S1, the copper sheet and tungsten plate for treating connection carry out removing surface respectively, it are made to show metallic luster；
The copper sheet for completing removing surface and tungsten plate are carried out overlap joint fixation, and coated on the Free Surface of copper sheet by step S2
One layer of activating agent；
Step S3 is carried out spot welding between copper sheet and tungsten plate in the Free Surface side of copper sheet and is fixed using TIG weld method；
Wherein, in the step S2, the activating agent selects SiO2；
In the step S3, TIG weld parameter are as follows: distance is 2mm~4mm, welding current between tungsten electrode and copper sheet surface
Value is 140A~170A, and inert gas selects argon gas, and gas flow is 10~15L/min, and the spot welding time is 3s~5s.
2. copper according to claim 1-tungsten dissimilar metal plate electric arc spot welding method, which is characterized in that in the step S1
In, it is cleaned using surface of the cleaning solution being made of the concentrated sulfuric acid, dilute hydrochloric acid and water to tungsten plate；It is wherein dense in the cleaning solution
The volume ratio of sulfuric acid, dilute hydrochloric acid and water is 10:10:80.
3. copper according to claim 2-tungsten dissimilar metal plate electric arc spot welding method, which is characterized in that in the step S1
In, the surface of tungsten plate is cleaned by the cleaning solution first, scavenging period 10min repeatedly, then uses acetone pair
The surface of tungsten plate is finally rinsed.
4. copper according to claim 1-tungsten dissimilar metal plate electric arc spot welding method, which is characterized in that in the step S1
In, polished first using surface of the coarse sandpaper to copper sheet, remove the oxidation film on surface, then using concentration be 10% it is dilute
Sulfuric acid cleans the surface of copper sheet repeatedly, while being rinsed by surface of the clear water to copper sheet, finally uses acetone pair
The surface of copper sheet is finally rinsed.
5. copper according to claim 1-tungsten dissimilar metal plate electric arc spot welding method, which is characterized in that in the step S3
In, TIG weld parameter are as follows: distance is 3mm between tungsten electrode and copper sheet surface, and welding current value is 140A, and inert gas is selected
Argon gas, gas flow 10L/min, spot welding time are 4s.
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| CN1210048A (en) * | 1997-09-04 | 1999-03-10 | 国营五二三厂 | Argon arc welding spot welding method for cadmium plate with thickness of 0.5 mm |
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| CN103521897A (en) * | 2013-09-27 | 2014-01-22 | 兰州理工大学 | Method for butt joint of stainless steel plate with thickness of 12mm |
| CN104400194A (en) * | 2014-10-24 | 2015-03-11 | 山东省科学院新材料研究所 | Active welding method for dissimilar magnesium alloy plates |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070181550A1 (en) * | 2006-02-08 | 2007-08-09 | Siemens Power Generation, Inc. | A-TIG welding of copper alloys for generator components |
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2017
- 2017-10-18 CN CN201710969089.6A patent/CN107570839B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1210048A (en) * | 1997-09-04 | 1999-03-10 | 国营五二三厂 | Argon arc welding spot welding method for cadmium plate with thickness of 0.5 mm |
| CN101745709A (en) * | 2009-12-21 | 2010-06-23 | 哈尔滨工业大学 | Assistant coating TIG fusing-brazing method suitable for aluminum/steel dissimilar alloy butting |
| CN103128429A (en) * | 2013-03-08 | 2013-06-05 | 兰州理工大学 | Titanium/copper dissimilar metal and cold metal transitional connecting method |
| CN103521897A (en) * | 2013-09-27 | 2014-01-22 | 兰州理工大学 | Method for butt joint of stainless steel plate with thickness of 12mm |
| CN103521898A (en) * | 2013-10-08 | 2014-01-22 | 俞亮亮 | Unequal-diameter welding butt joint aluminum alloy pipe |
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