CN109719379A - A kind of ceramic core annular copper electrode and its resistance spot welding method - Google Patents
A kind of ceramic core annular copper electrode and its resistance spot welding method Download PDFInfo
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- CN109719379A CN109719379A CN201910044524.3A CN201910044524A CN109719379A CN 109719379 A CN109719379 A CN 109719379A CN 201910044524 A CN201910044524 A CN 201910044524A CN 109719379 A CN109719379 A CN 109719379A
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Abstract
The present invention provides a kind of ceramic core annular copper electrode and its resistance spot welding method, mainly solves the problems, such as that thin plate, ultra thin plate metal weld strength are difficult to ensure.The main body of copper electrode has annular end face, and annular end face center is ceramic core end face, and ceramic core end face is to be embedded in main body to be formed by the ceramic core autonomous agent annular end face center with certain altitude, and ceramic core end face is concordant with annular end face.When welding, center ceramic region is non-conductive, and electric current is conducted by copper material annular region, to generate annular electro thermal resistance respectively in electrode/plate, plate/plate interface, materials to be welded melts to form annular liquid metal；It is powered after terminating pressure maintaining, forms the joint for resistance spot welding of ring section.The nugget shape designability of light sheet material can be achieved in the present invention, i.e., the nugget of larger size is formed under conditions of smaller heat input, and avoid that thin plate is easy to produce is thinned and collapses, while ceramic core hardness is high, and the resistance to upset property of electrode is good, and the service life is longer.
Description
Technical field
The present invention relates to welding manufacture technical fields, specifically, more particularly to a kind of ceramic core annular copper electrode and
Its resistance spot welding method.
Background technique
Currently, resistance spot welding is one of Aeronautics and Astronautics, the most widely used welding method of auto manufacturing, with automobile system
For making, 3000-5000 resistance spot welding solder joint is had on an automobile, resistance spot welding is able to achieve the high-intensitive connection of plate,
And in order to guarantee that the reliability of automobile, practical number of welding are higher by design 30%, high-quality and efficient resistance spot welding technique can save
About a large amount of production cost, therefore, the update of resistance welding technology and equipment have important practical application meaning.
It needs to consider using more light-weighted material in terms of vehicle body loss of weight.High-strength steel, especially high-strength steel sheet applications by
Cumulative more, there are following difficult points for high-strength steel plate sheet welding: (1) thin plate is extremely sensitive to thermal weld stress, and welding window is narrow；(2)
High-strength steel postwelding is easy softening, reduces intensity, and the solder joint bigger than stock size is needed to guarantee failure load；(3) zinc coat into
Enter solder joint internal influence intensity.
Difficult point in view of the above technology increases welding spot size and comes down to more effective connection areas, can provide more
High failure load.However when high-strength steel sheet needs to obtain bigger solder joint, welding process just becomes extremely difficult,
Because of the defects of biggish welding current or weld interval will lead to biggish burn-through, splash.
Therefore, the problem that high-strength steel plate sheet welding becomes urgently to be resolved at present how is effectively carried out.
Summary of the invention
It is low according to high-strength steel sheet set forth above, ultra thin plate metal weld strength, it is difficult to the problems such as meeting design requirement, and
A kind of ceramic core annular copper electrode and its resistance spot welding method are provided.The present invention is mainly utilized to be embedded at copper electrodes center
Ceramic core forms the structure among annular copper end face for ceramic core end face, in the welding process, since center ceramic is not led
Electricity ultimately forms the joint for resistance spot welding of ring section, effectively prevent that welding current is excessive or weld interval it is too long caused by
The defects of burning or splashing.
The technological means that the present invention uses is as follows:
A kind of ceramic core annular copper electrode, which is characterized in that the main body of the copper electrode has annular end face, annular
End face center is ceramic core end face, and the ceramic core end face is by the ceramic core with certain altitude from the main ring
Shape end face center is embedded in formation in the main body, and the ceramic core end face is concordant with annular end face.
Further, the outer diameter of the annular end face is less than or equal to the outer diameter of the copper electrode, the ring of the annular end face
The value range of internal diameter is between 0mm~10mm；The height value range of the ceramic core is between 0mm~5mm.
The invention also discloses a kind of ceramic core annular copper electrode resistance spot welding methods, it is characterised in that including walking as follows
Suddenly,
S1, it will be placed by welding plate material, at least lateral electrode in two lateral electrodes is used as claims 1 or 2 is any
Ceramic core annular copper electrode described in claim；
S2, welding parameter being set as needed, the welding parameter includes welding current, pressure and time, powers on,
Electric current is conducted by the annular region of copper electrode, to generate ring resistance respectively in electrode/plate, plate/plate interface
Heat is melted to form annular liquid metal by welding plate material；
After S3, energization terminate and keep certain pressure, crystallisation by cooling is carried out, the point of resistance with ring section is ultimately formed
Plumb joint.
Further, in the step S1, according to by the thickness selection of welding plate material, by the electrode of welding plate material two sides, two sides are electric
Pole is ceramic core annular copper electrode；Or the ordinary electrode of all copper end faces in end face of a lateral electrode is chosen, other side electricity
Pole is ceramic core annular copper electrode.
Further, the size setting of the ceramic core is as follows: passing through tradition by welding plate material according to rupture theoretical calculation
Minimum welding spot size needed for electrode resistance weldering obtains the size of required ceramic core further according to amplification strength factor is required.
Having had single layer annular end face copper electrode at present, (as shown in figure 3, label 4 is existing annular end face electrode, center does not have
Have a ceramic core, only copper material annular, centre are hollow), multi-layer annular end face copper electrode, to the electricity of this single copper material
The design philosophy and defect of pole carry out brief analysis:
Since there are high-melting-point oxidation films for aluminum alloy surface, local pressure is improved using single layer or multi-layer annular,
Local current densities, high-temperature crushing aluminum alloy surface oxidation film are improved when energization；When welding galvanized steel plain sheet, in copper electrode center
Sky can be such that solder joint centre zinc fume effectively overflows.
And since centre metal gradually fills electrode centers hollow part in welding process, solder joint center is led therewith
Electricity, therefore the solder joint that postwelding obtains is circular solids solder joint.
With top electrode due to the presence of copper material annular end face, as electrode is upset, end wear after multiple welding, welding
Significant effect decline.
Design philosophy of the invention are as follows: when plate sheet welding, if necessary to obtain large scale solder joint, it is necessary to extend weld interval
Or improve welding current；Since resistance heat mainly has electrode centers generation, easily generate in solder joint under these conditions
The heart, which is largely thinned, even to be burnt.If centre is designed to round insulation material or low conductivity material, such as ceramic material
Material or graphite, the then it is possible to prevente effectively from heat production of solder joint center, makes welding process only need seldom energy that can form large scale
Solder joint, while effective reduction pad surface depth of cup.
Compared with more existing electrode, the invention has the following advantages that
(1) electrode structure is different: the present invention forms the double layer material end electrode of copper material around center ceramic material, this
Very big difference in design is deposited with the single material electrode of tradition (as shown in Fig. 2, label 3 is traditional electrode end face).
(2) welding process is different: at edge, high contact stress goes out heat production first for traditional electrode and ordinary electrode welding, then
It is rapidly converted to electrode centers heat production；Heat production range of the present invention is in annular extent.
(3) solder joint shape is different: due to welding process heat production, traditional electrode and single copper material annular electrode postwelding
Circular solids solder joint is formed, bonding area increases as weld interval extends, and full-size is equal to electrode end surface diameter；This
Invention postwelding forms annular solder joint, and size is worked as with outside copper material circular phase substantially；According to plate thickness design ceramics, copper material
Matter regional diameter, to obtain corresponding solder joint.
Concrete operations are as follows: being calculated, obtained using work when traditional electrode (solid electrode) according to rupture theory first
The minimum welding spot size that journey needs designs required ceramic core size and annular end face further according to amplification strength factor is required
Size.Such as 1mmQ235 plate resistance spot welding, traditional solder joint need diameter 4mm that can choose annular end face with proof strength
Outer diameter 6mm, internal diameter 3mm, ceramic core diameter be 3mm ceramic core annular copper electrode, thus obtain be more than design it is strong
Coefficient is spent, more reliable engineering application requirement is met.Similar, the DP980 plate of 1.5mm needs traditional solder joint of diameter 6mm,
Outer diameter 8mm, the internal diameter 4mm of annular end face are then chosen, ceramic core diameter is the ceramic core annular copper electrode of 4mm, is obtained more
High strength factor.
(4) service life is different: common annular electrode end face annular local crowning, due to the limited (Vickers of hardness of copper alloy
Below hardness number 200), welding times easily generate abrasion after increasing, upset or aluminium alloy is sticked in annular gap, weld
Effect is connect to decline rapidly.The present invention uses ceramic material for inner core, has the characteristics that (1000 or more Vickers hardness number) with high hardness,
Resistance to upset property is good, and the service life is longer；And end face is plane, the disadvantage being sticked in annular gap there is no aluminium alloy etc..
To sum up, it applies the technical scheme of the present invention and can effectively solve high-strength steel sheet, ultra thin plate metal weld strength is difficult to
The problem of meeting design requirement.The present invention can be extensive in fields such as high-strength steel sheet, the welding of ultra thin plate metal based on the above reasons
It promotes.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to do simply to introduce, it should be apparent that, the accompanying drawings in the following description is this hair
Bright some embodiments for those of ordinary skill in the art without any creative labor, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the schematic diagram of ceramic core annular copper electrode of the present invention.
Fig. 2 is the schematic diagram of traditional electrode.
Fig. 3 is the schematic diagram of existing annular end face electrode.
Fig. 4 is ceramic core annular copper electrode welding process schematic of the present invention.
Fig. 5 is pad surface and the schematic diagram of solder joint cross section after ceramic core annular copper electrode welding of the present invention.
Fig. 6 is the comparison diagram of the present invention annular solder joint and traditional electrode pad surface, wherein (a)-(e) is welding current
From the exterior view of 14kA-22kA, (f) be 22kA when tradition pad surface figure.
The comparison diagram of Q235 steel traditional electrode solder joint and the present invention annular solder joint cross section that Fig. 7 is 1mm, wherein (a)-
(e), (f)-(j) is respectively changing rule of two kinds of welding method electric currents from 14kA-22kA.
The comparison diagram of DC06 steel traditional electrode solder joint and the present invention annular solder joint cross section that Fig. 8 is 0.7mm, wherein
(a)-(e), (f)-(j) are respectively changing rule of two kinds of welding method electric currents from 12kA-20kA.
In figure: 1, ceramic core；2, annular end face；3, traditional electrode end face；4, existing annular end face electrode；5, by welding plate
Material；6, annular nugget (fusing metallic region)；7, unfused area.
Specific embodiment
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only
It is only a part of the embodiment of the present invention, instead of all the embodiments.It is real to the description of at least one exemplary embodiment below
It is merely illustrative on border, never as to the present invention and its application or any restrictions used.Based on the reality in the present invention
Example is applied, every other embodiment obtained by those of ordinary skill in the art without making creative efforts all belongs to
In the scope of protection of the invention.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to exemplary embodiments of the present invention.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
Unless specifically stated otherwise, positioned opposite, the digital table of the component and step that otherwise illustrate in these embodiments
It is not limited the scope of the invention up to formula and numerical value.Simultaneously, it should be clear that for ease of description, each portion shown in attached drawing
The size divided not is to draw according to actual proportionate relationship.Technology known for person of ordinary skill in the relevant, side
Method and equipment may be not discussed in detail, but in the appropriate case, and the technology, method and apparatus should be considered as authorizing explanation
A part of book.In shown here and discussion all examples, appointing should be construed as merely illustratively to occurrence, and
Not by way of limitation.Therefore, the other examples of exemplary embodiment can have different values.It should also be noted that similar label
Similar terms are indicated in following attached drawing with letter, therefore, once it is defined in a certain Xiang Yi attached drawing, then subsequent attached
It does not need that it is further discussed in figure.
In the description of the present invention, it is to be understood that, the noun of locality such as " front, rear, top, and bottom, left and right ", " it is laterally, vertical,
Vertically, orientation or positional relationship indicated by level " and " top, bottom " etc. is normally based on orientation or position shown in the drawings and closes
System, is merely for convenience of description of the present invention and simplification of the description, in the absence of explanation to the contrary, these nouns of locality do not indicate that
It must have a particular orientation or be constructed and operated in a specific orientation with the device or element for implying signified, therefore cannot manage
Solution is limiting the scope of the invention: the noun of locality " inside and outside " refers to inside and outside the profile relative to each component itself.
For ease of description, spatially relative term can be used herein, as " ... on ", " ... top ",
" ... upper surface ", " above " etc., for describing such as a device shown in the figure or feature and other devices or spy
The spatial relation of sign.It should be understood that spatially relative term is intended to comprising the orientation in addition to device described in figure
Except different direction in use or operation.For example, being described as if the device in attached drawing is squeezed " in other devices
It will be positioned as " under other devices or construction after part or construction top " or the device of " on other devices or construction "
Side " or " under its device or construction ".Thus, exemplary term " ... top " may include " ... top " and
" in ... lower section " two kinds of orientation.The device can also be positioned with other different modes and (is rotated by 90 ° or in other orientation), and
And respective explanations are made to the opposite description in space used herein above.
In addition, it should be noted that, limiting components using the words such as " first ", " second ", it is only for be convenient for
Corresponding components are distinguished, do not have Stated otherwise such as, there is no particular meanings for above-mentioned word, therefore should not be understood as to this
The limitation of invention protection scope.
As shown in Figure 1, the main body of the copper electrode has annular the present invention provides a kind of ceramic core annular copper electrode
End face 2,2 center of annular end face are ceramic core end face, and the ceramic core end face is by the ceramics with certain altitude
Core 1 is embedded in from the main body annular end face center to be formed in the main body, and the ceramic core end face and annular end face 2 are flat
Together.
The outer diameter of the annular end face 2 is less than or equal to the outer diameter of the copper electrode, and the outer diameter of copper electrode is most under normal conditions
It is big to select 10mm, so the value range of the ring internal diameter of the annular end face 2 is between 0mm~10mm, according to practical need
Set an annular；Concrete operations are as follows: being calculated first according to rupture theory, obtain and use traditional electrode (solid electricity
Pole) when requirement of engineering minimum welding spot size, further according to require amplification strength factor, design required 1 size of ceramic core and
2 size of annular end face.Such as 1mmQ235 plate resistance spot welding, traditional solder joint need diameter 4mm can be with proof strength, Ke Yixuan
Outer diameter 6mm, the internal diameter 3mm of annular end face are taken, ceramic core diameter is the ceramic core annular copper electrode of 3mm, to be surpassed
The strength factor for crossing design, meets more reliable engineering application requirement.Similar, the DP980 plate of 1.5mm needs diameter 6mm
Traditional solder joint, then choose outer diameter 8mm, the internal diameter 4mm of annular end face, ceramic core diameter is the ceramic core annular copper of 4mm
Electrode obtains higher strength factor.
The height value range of the ceramic core 1 generally highly has very thin size between 0mm~5mm, protects
Inner core and outer layer unlike material are demonstrate,proved, usually selects 2mm or 2mm side-to-side dimensions that can meet the requirements, ceramic core 1 can also replace
It is changed to similar insulating materials or the low conductivity material such as graphite, is welded i.e. as long as annular region conduction electric current can be met
It can.
As shown in Figure 4,5, the invention also discloses a kind of ceramic core annular copper electrode resistance spot welding method, including it is as follows
Step,
S1, it will be placed by welding plate material 5 (steel plate, aluminium alloy, magnesium alloy and titanium alloy etc. may be selected), in two lateral electrodes
An at least lateral electrode use the ceramic core annular copper electrode；It selects according to by the thickness of welding plate material 5 by 5 liang of welding plate material
The electrode of side, two lateral electrodes are ceramic core annular copper electrode；Or all copper end faces in end face of one lateral electrode of selection is general
Energization pole, another lateral electrode are ceramic core annular copper electrodes.
S2, welding parameter is set as needed, the welding parameter includes welding current, pressure and time, is powered on
When welding, center ceramic region is non-conductive, and electric current is conducted by the annular region of copper electrode, thus electrode/plate, plate/
Plate interface generates annular electro thermal resistance respectively, is melted to form annular liquid metal by welding plate material；In Fig. 5,6 be annular nugget
(fusing metallic region), 7 be unfused area, i.e. ceramic core region.
After S3, energization terminate and keep certain pressure, crystallisation by cooling is carried out, the point of resistance with ring section is ultimately formed
Plumb joint.
The nugget shape designability of light sheet material can be achieved in the present invention, i.e., forms larger ruler under conditions of smaller heat input
Very little nugget, avoid that thin plate is easy to produce is thinned and collapses, while ceramic core hardness is high, and the resistance to upset property of electrode is good, makes
Use longer life expectancy.
Embodiment 1
The ceramic core annular copper electrode resistance spot welding method of 1.5mm-1.5mm DP980 high-strength steel, includes the following steps:
S1, dedicated resistance spot welding ceramic core annular copper electrode, electrode shape: electrode annular end face 2 are made first
Annular diameters are 6mm, and ceramic core 1 is the circle of diameter 6mm, the periphery of ceramic core 1 by outer annular diameter 8mm copper material packet
It wraps up in, annular end face 2 is concordant with 1 end face of ceramic core；
S2, welding the stage, setting welding current be 14-22kA, pressure 4kN, time 150ms；Turn-on current generates electricity
Thermal resistance；
S3, crystallisation by cooling stage are powered after terminating and keeping pressure 1s, form the joint for resistance spot welding of ring section.
The annular maximum feature of solder joint first is that while obtaining larger spot size, closely generate lesser pad surface pressure
Trace depth.Fig. 6 is the surface topography of acquired annular solder joint.The cross section that Q235 traditional electrode and ceramic core copper electrode obtain
As shown in fig. 7, wherein (a)-(e), (f)-(j) be respectively two kinds of welding method electric currents from 14kA, 16kA, 18kA, 20kA and
The changing rule of 22kA.Scheme (f)-(j), annular solder joint cross section is divided into two parts, and ring width increases with the increase of welding current
Add, but the depth of cup of pad surface varies less.In contrast when traditional electrode is welded, the increasing of (a)-(e) electric current is schemed
Adding will lead to solder joint center depth of cup and increases sharply.Pad surface impression is inevitable, in order to guarantee the performance of solder joint
And it is beautiful, usually require that depth of cup is at most less than the 15% of plate thickness.Better solder joint table can be obtained using annular electrode
Face forming.Depth of cup is only 8% when the Q235 annular solder joint electric current of 1mm reaches 22kA, as shown in Fig. 7 (j)；And traditional solder joint
60% is had reached, as shown in Fig. 7 (e).
Embodiment 2
The ceramic core annular copper electrode resistance spot welding method of 0.7mm-0.7mm DC06 ultra-thin steel sheet, including walk as follows
It is rapid:
S1, dedicated resistance spot welding ceramic core annular copper electrode, electrode shape: electrode annular end face 2 are made first
Annular diameters are 3mm, and ceramic core 1 is the circle of diameter 3mm, the periphery of ceramic core 1 by outer annular diameter 7mm copper material packet
It wraps up in, annular end face 2 is concordant with 1 end face of ceramic core；
S2, welding the stage, setting welding current be 12-20kA, pressure 3kN, time 100ms；Turn-on current generates electricity
Thermal resistance；
S3, crystallisation by cooling stage are powered after terminating and keeping pressure 1s, form the joint for resistance spot welding of ring section.
Obtained welding point cross section is as shown in Figure 8.
It is similar as a result, as shown in figure 8, wherein (a)-(e), (f)-(j) that the DC06 plate of 0.7mm has obtained embodiment 1
Changing rule of the respectively two kinds of welding method electric currents from 12kA, 14kA, 16kA, 18kA and 20kA.0.7mm belongs to thin plate, weldering
Termination process is more sensitive for heat input, and identical depth of cup is higher for plate thickness ratio.The DC06 annular solder joint of 0.7mm
Depth of cup is only 9% when electric current reaches 18kA, as shown in Fig. 7 (i)；Reach when 20% due to generating splashing impression rate
The 11% of plate thickness, as shown in Fig. 7 (j), and traditional weld indentation depth ratio has reached 72%, as shown in Fig. 7 (e).
Embodiment 3
The ceramic core annular copper electrode resistance spot welding method of 1.0mmQ235 steel plate -1.0mm6061 aluminium alloy, including such as
Lower step:
S1, dedicated resistance spot welding ceramic core annular copper electrode, electrode shape: electrode annular end face 2 are made first
Annular diameters are 4mm, and ceramic core 1 is the circle of diameter 4mm, the periphery of ceramic core 1 by outer annular diameter 7mm copper material packet
It wraps up in, annular end face 2 is concordant with 1 end face of ceramic core；
S2, welding the stage, setting welding current be 12kA, pressure 3kN, time 200ms；Turn-on current generates resistance
Heat；
S3, crystallisation by cooling stage, being powered terminates and keeps pressure 1s, forms the joint for resistance spot welding of ring section.
Aluminum steel dissimilar metal welding difficult point is that two kinds of metal reactions generate the intermetallic compound that hardness is high, brittleness is big.
Traditional solder joint postwelding solder joint center heat production is concentrated, and generates a large amount of intermetallic compounds, welding spot size is small, and failure load is low.Using
The intermetallic compound that ceramic core copper electrode postwelding generates in a ring, is evenly distributed, and annular outer diameter is big, and failure load improves.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (5)
1. a kind of ceramic core annular copper electrode, which is characterized in that the main body of the copper electrode has annular end face, annular end
Face center is ceramic core end face, and the ceramic core end face is annular from the main body by the ceramic core with certain altitude
End face center is embedded in formation in the main body, and the ceramic core end face is concordant with annular end face.
2. ceramic core annular copper electrode according to claim 1, which is characterized in that the outer diameter of the annular end face is less than
Equal to the outer diameter of the copper electrode, the value range of the ring internal diameter of the annular end face is between 0mm~10mm；In the ceramics
The height value range of core is between 0mm~5mm.
3. a kind of ceramic core annular copper electrode resistance spot welding method, it is characterised in that include the following steps,
S1, it will be placed by welding plate material, at least lateral electrode in two lateral electrodes uses such as any right of claims 1 or 2
It is required that the ceramic core annular copper electrode；
S2, welding parameter is set as needed, the welding parameter includes welding current, pressure and time, is powered on, electric current
It is conducted by the annular region of copper electrode, to generate annular electro thermal resistance, quilt respectively in electrode/plate, plate/plate interface
Welding plate material melts to form annular liquid metal；
After S3, energization terminate and keep certain pressure, crystallisation by cooling is carried out, ultimately forms the point of resistance welding with ring section
Head.
4. ceramic core annular copper electrode resistance spot welding method according to claim 3, which is characterized in that the step S1
In, it selects according to by the thickness of welding plate material by the electrode of welding plate material two sides, two lateral electrodes are ceramic core annular copper electrode；Or
The ordinary electrode of all copper end faces in end face of a lateral electrode is chosen, another lateral electrode is ceramic core annular copper electrode.
5. ceramic core annular copper electrode resistance spot welding method according to claim 3, which is characterized in that in the ceramics
The size setting of core is as follows: minimum welding spot size needed for passing through traditional electrode electric resistance welding by welding plate material according to rupture theoretical calculation,
Further according to amplification strength factor is required, the size of required ceramic core is obtained.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110814497A (en) * | 2019-11-22 | 2020-02-21 | 吉林大学 | Film insulation core non-conductive electrode cap and annular nugget resistance spot welding method |
| CN111014923A (en) * | 2020-02-18 | 2020-04-17 | 吉林大学 | Resistance spot welding device and method for unequal-thickness plates |
| CN112916992A (en) * | 2019-12-06 | 2021-06-08 | 中国科学院上海光学精密机械研究所 | Resistance spot welding electrode for welding high-strength steel and welding method thereof |
| CN114713957A (en) * | 2022-03-30 | 2022-07-08 | 天津大学 | Split spot welding electrode and resistance spot welding method for regulating nugget |
| CN115138956A (en) * | 2022-07-20 | 2022-10-04 | 湖北超卓航空科技股份有限公司 | Steel core composite electrode for high-elasticity alloy and spot welding process thereof |
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| CN104084686B (en) * | 2014-06-12 | 2017-01-18 | 上海翼锐汽车科技有限公司 | Electrode for restraining generation of aluminum alloy resistance spot welding crack |
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