CN107350613A - The resistor spot welding process method of steel workpiece with coated layer - Google Patents
The resistor spot welding process method of steel workpiece with coated layer Download PDFInfo
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- CN107350613A CN107350613A CN201710655949.9A CN201710655949A CN107350613A CN 107350613 A CN107350613 A CN 107350613A CN 201710655949 A CN201710655949 A CN 201710655949A CN 107350613 A CN107350613 A CN 107350613A
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- 238000003466 welding Methods 0.000 title claims abstract description 141
- 238000000034 method Methods 0.000 title claims abstract description 97
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 47
- 239000010959 steel Substances 0.000 title claims abstract description 47
- 230000003111 delayed effect Effects 0.000 claims abstract description 3
- 238000000576 coating method Methods 0.000 claims description 32
- 239000011248 coating agent Substances 0.000 claims description 29
- 239000011701 zinc Substances 0.000 claims description 23
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 22
- 229910052725 zinc Inorganic materials 0.000 claims description 22
- KMWBBMXGHHLDKL-UHFFFAOYSA-N [AlH3].[Si] Chemical compound [AlH3].[Si] KMWBBMXGHHLDKL-UHFFFAOYSA-N 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 1
- 239000010410 layer Substances 0.000 abstract description 34
- 239000000463 material Substances 0.000 abstract description 27
- 239000011247 coating layer Substances 0.000 abstract description 6
- 238000010438 heat treatment Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 description 11
- 238000002474 experimental method Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- 229910000679 solder Inorganic materials 0.000 description 9
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 8
- 238000005269 aluminizing Methods 0.000 description 8
- 229910052710 silicon Inorganic materials 0.000 description 8
- 239000010703 silicon Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 238000005246 galvanizing Methods 0.000 description 6
- 230000005611 electricity Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 239000000498 cooling water Substances 0.000 description 4
- 238000010008 shearing Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000010422 painting Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 239000010960 cold rolled steel Substances 0.000 description 2
- 238000007598 dipping method Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000635 Spelter Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- ZTXONRUJVYXVTJ-UHFFFAOYSA-N chromium copper Chemical compound [Cr][Cu][Cr] ZTXONRUJVYXVTJ-UHFFFAOYSA-N 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- KFZAUHNPPZCSCR-UHFFFAOYSA-N iron zinc Chemical compound [Fe].[Zn] KFZAUHNPPZCSCR-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000289 melt material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
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
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/10—Spot welding; Stitch welding
- B23K11/11—Spot welding
- B23K11/115—Spot welding by means of two electrodes placed opposite one another on both sides of the welded parts
-
- 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
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Resistance Welding (AREA)
Abstract
The invention discloses a kind of resistor spot welding process method of the steel workpiece with coated layer, treat welding steel workpiece and overlapped, and apply pressure to lap-joint, carry out pressurization holding；First welding current is acted on into lap-joint, and made for the first welding current continuous action very first time；Afterwards, the first welding current is removed, and is kept for the second time；After being kept for the second time, the second welding current is acted on into lap-joint, and make the time of the second welding current continuous action the 3rd；After continuing for the 3rd time, the second welding current is delayed within the 4th time and be down to 0；Wherein, the second welding current is more than the first welding current, and the very first time is more than or equal to 600ms with the second time sum.Coated layer is destroyed using the first welding current of output, the second welding current of output sets longer stopping output timing between the two, promote the discharge of coating layer material, it is suppressed that the generation of splashing, can obtain wider process window to complete heating welding.
Description
Technical field
The invention belongs to welding technology field, more particularly to a kind of resistance spot welding process side of the steel workpiece with coated layer
Method.
Background technology
The base metals for occurring melting in resistance spot welding process, during welding fly out from overlap joint sheet material faying face or from sheet materials
The phenomenon to be flown out with electrode contact surface, referred to as " splash ".After generation splash phenomena, the metal of sputtering is attached to electrode surface,
The welding effect of electrode is influenceed, and then makes electrode dressing frequent, electrode life shortens；And generation of splashing is along with spot welding
The internal flaw of joint, influences strength of welded joint.Typically by electric current when splashing be referred to as splashing electric current or on ration the power supply
Stream, ensure that the electric current of benchmark nugget size is referred to as lower current.Current range between upper and lower limit electric current is evaluation resistance spot welding
The important criterion of technique, referred to as process window.
Now in car body manufacture production, the connection of car body sheet material is mainly carried out by resistance spot welding.Car body is each
Partially due to role-taking is different, it is also different from sheet material.For example, to meet the safeguard protection to riding people and anticorrosive property
Can, car body B posts are more from the hot press-formed sheet material for silicon coating of aluminizing, and to take into account lightweight requirements, covering is chosen zinc-plated more
Coating sheet material.
Splashed in car body manufacture welding, except final property of welded joint can be influenceed, and cause electrode dressing
Frequently, outside electrode life is reduced；The metal of sputtering is attached to car body surface, and it is attractive in appearance to influence car body surface, and the later stage needs
Removing is handled, and increases production cost.It is real due to welding current stability and uniformity in the production of actual producing line
Border current value often in 10 or so the floating up and down of setting value, obtains wider process window, avoids splashing, have
There is very strong practical significance.
The content of the invention
One of technical problems to be solved by the invention are in resistance spot welding welding process, suppress the generation splashed, and
Obtain wider process window.
In order to solve the above-mentioned technical problem, embodiments of the invention propose a kind of resistance of the steel workpiece with coated layer
Spot-welding technology method, comprises the following steps：
Treat welding steel workpiece to be overlapped, and apply pressure to lap-joint, carry out pressurization holding；
First welding current is acted on into the lap-joint, and makes the first welding current continuous action very first time；
After the persistently very first time, first welding current is removed, and kept for the second time；
After being kept for second time, the second welding current is acted on into the lap-joint, and makes second welding
The time of electric current continuous action the 3rd；
After persistently the 3rd time, second welding current is delayed within the 4th time and be down to 0；
Wherein, second welding current is more than first welding current, the very first time and second time
Sum is more than or equal to 600ms.
Preferably, the pressure that the pressurization is kept is 3-8KN.
Preferably, the peak value of pulse of first welding current is 3-5.5KA.
Preferably, the very first time is 200-700ms.
Preferably, second time is 300-600ms.
Preferably, the peak value of pulse of second welding current is 6-9.5KA, and the 3rd time is 300-600ms.
Preferably, the 4th time is 80-240ms.
Preferably, in addition to：
After making that second welding current is slow and being down to 0, the lap-joint is kept pressurizeing, while lead to the lap-joint
With cooling water.
Preferably, the steel workpiece with coated layer includes zinc coated layer steel workpiece and aluminium silicon coated layer steel workpiece；Its
In, the thickness of coating of the zinc coated layer steel workpiece is 10-35 μm, and the thickness of coating of the aluminium silicon coated layer steel workpiece is 20-
50μm；The thickness sum of the zinc coated layer steel workpiece and the aluminium silicon coated layer steel workpiece is 2-4mm.
The resistor spot welding process method of the present invention, is destroyed using the first welding current to coated layer first, is recycled
Second welding current sets the stopping of long period between the two to export to promote coating layer material to complete heating welding
Discharge, reduce influence of the coating layer material to heating welding, it is suppressed that the generation of splashing, and wider process window can be obtained
Mouthful, it ensure that exploitativeness of the welding procedure in actual production.
Other advantages, the target of the present invention, and feature will be illustrated in the following description to a certain extent, and
And to a certain extent, based on will be apparent to those skilled in the art to investigating hereafter, Huo Zheke
To be instructed from the practice of the present invention.The target and other advantages of the present invention can be wanted by following specification, right
Specifically noted structure is sought in book, and accompanying drawing to realize and obtain.
Brief description of the drawings
Accompanying drawing is used for providing to the technical scheme of the application or further understanding for prior art, and constitution instruction
A part.Wherein, the accompanying drawing for expressing the embodiment of the present application is used for the technical side for explaining the application together with embodiments herein
Case, but do not form the limitation to technical scheme.
Fig. 1 is the flow signal of the resistor spot welding process method of the steel workpiece with coated layer according to embodiments of the present invention
Figure；
Fig. 2 is the explanation schematic diagram of the process implementing device of resistor spot welding process method according to embodiments of the present invention；
Fig. 3 is the welding current output timing schematic diagram of resistor spot welding process method according to embodiments of the present invention；
Fig. 4 is with contrasting the solder joint of case most in contrast experiment 1 using the resistor spot welding process method of the embodiment of the present invention
It is big to draw shearing comparison diagram；
Fig. 5 is with contrasting the solder joint of case most in contrast experiment 2 using the resistor spot welding process method of the embodiment of the present invention
It is big to draw shearing comparison diagram.
Embodiment
Embodiments of the present invention are described in detail below with reference to drawings and Examples, and how the present invention is applied whereby
Technological means solves technical problem, and the implementation process for reaching relevant art effect can fully understand and implement according to this.This Shen
Each feature that please be in embodiment and embodiment, can be combined with each other under the premise of not colliding, the technical scheme formed
Within protection scope of the present invention.
In car body manufacture production, it is related to the resistance spot welding with coated layer steel workpiece, such as to the zinc-plated paintings of DP950
The welding of laminate and silicon 1500MPa level drop stamping plates of aluminizing.Inventor is carried out for the resistance spot welding performance of this welding relation
Research is found：
Existing welding procedure is in welding process, and after connecting welding current, the coating of two kinds of materials successively melts, and is formed molten
Melt the coating of state.Because spelter coating has differences with aluminium silicon coating in thickness, fusing point, boiling point, resistivity etc., specially zinc
Coating first melts, and is melted after aluminium silicon coating, and under the pressure effect of welding electrode, the coating of partial melting state is squeezed pressure
Go out.
Afterwards under welding current effect, heat input is continuously increased, and temperature reaches zinc boiling point, and it is existing that vaporization occurs for liquid Zn
As now interface has molten state aluminium silicon, molten state zinc, vaporizes three kinds of state coating materials of zinc, and these three state coatings
Material can not discharge well.During formation nugget afterwards, undischarged coating material influences the heat of welding current
Input action, cause heat input uneven, and then just splashed in less electric current, influence final property of welded joint,
And cause process window narrower.
Therefore, the present invention proposes a kind of resistor spot welding process method of the steel workpiece with coated layer, using dipulse side
Formula, certain welding residence time is set between two pulses, to promote spot welding coating material to discharge, so as to avoid splashing,
And wider process window can be obtained.
Such as in car body manufacture, conventional sheet material used in it is the silicon painting of aluminizing of galvanizing coating plate and drop stamping processing
Laminate.The silicon coating plate of aluminizing of drop stamping processing, coating material occur alloy reaction with steel matrix, easily form intermetallic
Thing and iron-based solid solution, oxide is formed on surface.Galvanizing coating plate also forms the oxide using zinc as main component on surface.
This intermetallic compound and oxide are used to improving the corrosion resistance of sheet material, but easily cause in resistance spot welding simultaneously winged
Splash.
In the present embodiment, it is made up of the first steel workpiece with zinc coated layer and the second steel workpiece with aluminium silicon coated layer to be welded
The workpiece lap body connect, implements resistor spot welding process method proposed by the present invention to the workpiece lap body, and the present invention takes to composition
The intensity rank for connecing the steel of relation is not particularly limited.
Present invention is also not necessarily limited to the production technology of the steel welded and coating process, such as steel workpiece with aluminium silicon coated layer
It is to be process by hot rolled steel plate or cold-rolled steel sheet steel plate through hot press-formed, the steel workpiece such as with zinc coated layer is in shape thereon
It is galvanizing by dipping, zinc-plated annealing, zinc plating or zinc-iron into the hot rolled steel plate or cold-rolled steel sheet of metal zinc layers, such as zinc coating process
Plating.
Below in conjunction with the resistance spot welding process for being used to implement the embodiment of the present invention shown in the flow chart shown in Fig. 1, Fig. 2
Welding current output timing diagram shown in the implementation schematic illustration and Fig. 3 of method, to the resistance of the embodiment of the present invention
Spot welding method illustrates.
First, as shown in process S110 in Fig. 1, treat welding steel workpiece and overlapped, and by the first steel workpiece 9, the second steel
The workpiece lap body that workpiece 10 is formed, is placed between spot-wedling electrode 11a, 11b (as shown in Figure 2).Pressue device 12 in Fig. 2 carries
Voltage supply power, spot-wedling electrode 11a, 11b apply pressure to the lap-joint of workpiece lap body and kept.
Form the first steel workpiece 9 and the second steel workpiece 10 of workpiece lap body, respectively galvanizing coating plate and silicon painting of aluminizing
Laminate.Spot-wedling electrode 11a, 11b are usually chromium-copper material, and its circular top has the planar end surface of certain diameter, planar end surface diameter
Preferred scope is 4-8mm.In the present embodiment, a diameter of 6mm of planar end surface of spot-wedling electrode.
As shown in Fig. 2 pressure is provided by pressue device 12, pressure, which produces, can be based on servomotor or based on compressed air
Realize.The relative clamping of spot-wedling electrode 11a, 11b, pressurization is realized to workpiece lap body, when the size of pressure output and holding
Between controlled by loading controls 8.Specifically, moulding pressure is 3-8KN in the present embodiment.
Set S110 processes, be in order that between welding electrode and workpiece lap body, form workpiece lap body steel workpiece
Between it is closely connected, to reduce contact resistance.Such as the aluminium silicon coated layer hardness of the drop stamping plate surface with silicon coating of aluminizing is high,
On microcosmic, its surface irregularity, contact resistance is big after overlap joint, and it is unbalanced and trigger and splash to easily cause the moment heat input that is powered,
Pressurization makes each contact surface of lap-joint closely connected, reduces this contact resistance.And in welding process, pressurization is kept to may additionally facilitate row's zinc
With the effect of limitation molten metal splash.
Further, between guarantee welding electrode and workpiece lap body, between the steel workpiece of composition workpiece lap body
Closely connected effect, before welding current is exported, pressurization need to continue a fixed length time, and the sequential in this time is referred to as pretension rank
Section, similar with existing process, pretension phase duration is generally 300-600ms.And during the welding after the pretension stage,
Also pressurization is remained.
After process S110, continue the process S120 shown in Fig. 1, spot-wedling electrode exports the first welding current, the first weldering
It is current path between the lap-joint of workpiece lap body, spot-wedling electrode 11a, 11b to connect the function of current, by heating effect of current,
Destroy the coated layer of steel workpiece to be welded.
Fig. 3 show the output timing schematic diagram of welding current, and in process S120, the first welding current is power frequency alternation electricity
Stream, the peak value of pulse intensity of the first welding current is I1, and continuous action very first time t1, in process S120, coated layer is melt
Melt, vaporize, partial melting coated layer is discharged under pressurization.
Continue the process S130 shown in Fig. 1 afterwards, welding current output state is as shown in figure 3, spot-wedling electrode stops
Export the first welding current, and continue to keep the second time t2, in t2 sequential on the coated layer that is destroyed in a process by from
Welding position is completely exhausted out.To ensure to discharge effect, very first time t1 and the second time t2 sum are more than or equal to 600ms.
It can be appreciated that in above-mentioned operation S120, S130, t1, t2, and I1 specific selection and coating layer material and coating
Thickness degree is related.In specific application scenarios, zinc coated layer thickness preferred scope is 10-35 μm, and aluminium silicon coated layer thickness is excellent
It is 20-50 μm to select scope.T1 preferred scope is 200ms to 700ms.T2 preferred scope is 300ms between 600ms.I1
Preferred scope is 3-5.5KA.
For example, in a preferred embodiment, zinc coated layer thickness is 28 μm, and aluminium silicon coated layer thickness is 35 μ
M, t1 300ms, t2 300ms, I1 4KA.
After process S130, continue process S140 in Fig. 1, welding current output state is as shown in figure 3, spot-wedling electrode exports
Second welding current, act on the lap-joint of workpiece lap body.Second welding current is power frequency alternating current, continues for the 3rd time
T3, the peak value of pulse intensity of the second welding current is I2, and the peak value of pulse intensity of the second welding current is more than the second welding electricity
The peak value of pulse intensity of stream, i.e. I2 are more than I1.
Second welding current, which is used to heat, to be welded, so that lap-joint's solder joint of workpiece lap body is in molten condition.Due to
The extra pre- heat effect of the discharge of coating material and the first welding current in process before, the heat of welding is heated in this process
The zone of influence is larger, is advantageous to improve the mechanical property of final welding point.
It can be appreciated that in process S140, I2 and t3 selection are related to the thickness of sheet material and material.In specific applied field
Jing Zhong, band zinc Coated Steel Sheet material thickness preferred scope is 0.8-1.8mm, and band aluminium silicon Coated Steel Sheet material thickness preferred scope is
1-2mm, and both thickness sums are 2-4mm；Correspondingly, t3 preferred scope is 300ms to 600ms, and I2 preferred scope is
6-9.5KA。
For example, in a preferred embodiment, band zinc Coated Steel Sheet material thickness is 1.2mm, band aluminium silicon coating
Layer steel board thickness is 1.8mm, t3 400ms, I2 9KA.
After process S140, continue process S150 in Fig. 1, the second welding current is after continuing for the 3rd time, spot welding electricity
Second welding current of pole output delays in the 4th time t4 is down to 0, is specifically shown in sequential shown in Fig. 3.It is this in process S150
The welding current of slow drop, the cooling velocity of lap-joint's solder joint can be slowed down, and then the solder joint melted gradually cools down, to promote nugget
The uniformity diffusion in region, be advantageous to improve the mechanical property of final welding point.T4 preferred scope is 80-240ms.Example
Such as, t4 is taken as 200ms.
Finally, it is identical with existing process, resistance welder output be reduced to zero after, to lap-joint continue keep pressurization one section when
Between, continue to cool down, so that solder joint forms nugget.
Further, keeping pressurization simultaneously, passing through 14 in Fig. 2, there is provided recirculated cooling water simultaneously flows at spot-wedling electrode
Go out, cooled down with butt welding point, so as to improve the cooling velocity of solder joint to improve the mechanical property of final nugget.The present embodiment
In, the flow velocity of cooling water is 2cm3/s。
After being kept for pressurization a period of time, pressurization is removed, the weld job of the solder joint of the workpiece lap body is completed.
In addition, in the implementation of Fig. 2 resistor spot welding process method, 7 be AC power, for providing welding current.
13 be current controller, for controlling the size and sequential of the welding current from spot-wedling electrode output.It is understood that Fig. 2
In 7,8,11a, 11b, 12,13,14 can be realized by the corresponding function part of existing resistance welder.Such as in the present embodiment
Single phase ac resistance welder used by process implementing.
In spot-welding technology method proposed by the present invention, first using smaller current, the first welding electricity of longer duration
Stream, ensure to exclude the coated layer melt material at the contact interface of workpiece lap body and part under small heat input, afterwards
The stopping output timing of longer duration is set to be discharged so that the coating layer material for ensureing to melt, vaporize is whole.By above work
Sequence, wider current path is formd in contact surface, under the second larger welding current, it is suppressed that splash and occur.And then use
Larger current, the second welding current of shorter conduction time are to obtain the nugget that sufficient size meets welding performance.Second welding
After electric current terminates, delay drop electric current and ensure cooling velocity, promote the carbon spread of the fusion area organized the formation of by different matrix, make it
Tend to homogenize, improve the toughness of welding point.
The resistor spot welding process method of steel workpiece proposed by the present invention with coated layer, can completely inhibit splashing, carry
High workpiece exterior quality, and then the process for eliminating cleaning workpiece surface spikes, improve production efficiency.In addition, using this hair
The resistor spot welding process method of the steel workpiece with coated layer of bright proposition, set the stopping of long period to export process, protecting
In the case of card obtains regulation weld strength, preferable process window also can obtain.Process window is defined as welding when splashing
Electric current with ensure benchmark nugget size electric current difference.
Below by two groups of contrast experiments, the beneficial effect for obtaining preferable process window is described further.
In contrast experiment 1,2, by fixed part parameter, the peak point current of the second welding current is set to carry out electricity for variable
Spot welding is hindered, the lower bound current value of nugget size and the upper limit current not splashed on the basis of ensureing welding point are drawn by this
Value, wherein benchmark nugget size are(t is thicker plate material thickness in welded part).Tack-weld Spot size by
Microstructure under LEICA microscopes measures, and confirms that splashing whether there is by estimating during spot welding.
Spot-welding equipment is all the single phase ac resistance electric welding machine based on pressurized with compressed air formula in contrast experiment 1,2, spot welding
The a diameter of 6mm of planar end surface of electrode.Welded part is respectively from galvanizing by dipping coating DP590 industrial plates and silicon coating of aluminizing
1500MPa level drop stamping industrial plates.Wherein zinc layers and its alloying thickness are about 28um, aluminium silicon coating and its alloying thickness
About 35um, size are 30mm × 100mm.Moulding pressure is 3.5KN, and cooling water speed is 2cm3/s。
In contrast experiment 1,2, the case study on implementation of test number 1 uses present invention process method, the comparison case of test number 2
As a comparison, using low residence times, sheet metal thickness is 1.2mm to example in contrast experiment 1, obtains the experimental data such as institute of table 1
Show.
The experimental data of the contrast experiment 1 of table 1
In contrast experiment 2 DP590 plate thickness be 1.2mm, silicon drop stamping plate thickness of aluminizing be 1.8mm, obtain experimental data
As shown in table 2.
The experimental data of the contrast experiment 2 of table 2
The comparative experimental data shown in table 1, table 2, the case study on implementation of test number 1 and the comparison case of test number 2
Example is compared, and the scope of process window expands about 1 times.
In addition, the maximum of the case study on implementation of test number 1 draws the ratio sheared (in terms of KN) with workpiece gross thickness in table 1, table 2
Value is all higher than 5, and failure mode is that nugget is extracted and draws shearing almost close to the strength degree of galvanizing coating plate.And such as Fig. 4 and
Shown in Fig. 5, under the second same welding current, the maximum of case study on implementation solder joint draws shearing left compared to comparison cases lifting 10%
It is right.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any those skilled in the art disclosed herein technical scope in, the change or replacement that can readily occur in should all be contained
Cover within protection scope of the present invention.Therefore, protection scope of the present invention should be defined by scope of the claims.
Claims (9)
1. a kind of resistor spot welding process method of the steel workpiece with coated layer, comprises the following steps：
Treat welding steel workpiece to be overlapped, and apply pressure to lap-joint, carry out pressurization holding；
First welding current is acted on into the lap-joint, and makes the first welding current continuous action very first time；
After the persistently very first time, first welding current is removed, and kept for the second time；
After being kept for second time, the second welding current is acted on into the lap-joint, and make second welding current
The time of continuous action the 3rd；
After persistently the 3rd time, second welding current is delayed within the 4th time and be down to 0；
Wherein, second welding current is more than first welding current, the very first time and the second time sum
More than or equal to 600ms.
2. resistor spot welding process method according to claim 1, it is characterised in that the pressure that the pressurization is kept is 3-
8KN。
3. resistor spot welding process method according to claim 1, it is characterised in that the pulse peak of first welding current
It is worth for 3-5.5KA.
4. resistor spot welding process method according to claim 1, it is characterised in that the very first time is 200-700ms.
5. resistor spot welding process method according to claim 1, it is characterised in that second time is 300-600ms.
6. resistor spot welding process method according to claim 1, it is characterised in that the pulse peak of second welding current
It is 300-600ms to be worth for 6-9.5KA, the 3rd time.
7. resistor spot welding process method according to claim 1, it is characterised in that the 4th time is 80-240ms.
8. resistor spot welding process method according to claim 1, it is characterised in that also include：
After making that second welding current is slow and being down to 0, the lap-joint is kept pressurizeing, while pass to the lap-joint cold
But water.
9. resistor spot welding process method according to any one of claim 1 to 8, it is characterised in that described to carry coating
The steel workpiece of layer includes zinc coated layer steel workpiece and aluminium silicon coated layer steel workpiece；Wherein, the coating of the zinc coated layer steel workpiece
Thickness is 10-35 μm, and the thickness of coating of the aluminium silicon coated layer steel workpiece is 20-50 μm；The zinc coated layer steel workpiece and institute
The thickness sum for stating aluminium silicon coated layer steel workpiece is 2-4mm.
Priority Applications (1)
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| CN108581159A (en) * | 2018-04-28 | 2018-09-28 | 东北大学 | A kind of welding method of thermal neutron shielding stainless steel plate |
| CN108890110A (en) * | 2018-09-10 | 2018-11-27 | 东北大学 | A kind of resistance spot welding process improving Q&P steel welded joint quality |
| CN109079304A (en) * | 2018-10-10 | 2018-12-25 | 鞍钢股份有限公司 | A kind of spot-welding technology method of carbon equivalent high cold-rolled biphase steel |
| CN109108069A (en) * | 2018-08-01 | 2019-01-01 | 上海宝钢包装钢带有限公司 | The milling method of Varying-thickness automobile B-column |
| CN111673250A (en) * | 2020-06-09 | 2020-09-18 | 首钢集团有限公司 | Resistance spot welding method for passivated coated steel plate |
| CN111856662A (en) * | 2020-03-10 | 2020-10-30 | 成都优博创通信技术股份有限公司 | Optical device coupling welding method |
| CN112695249A (en) * | 2020-12-11 | 2021-04-23 | 马鞍山钢铁股份有限公司 | 1800MPa grade double-sided non-uniform-thickness aluminum-silicon coating hot forming steel and resistance spot welding method thereof |
| CN112955271A (en) * | 2018-11-26 | 2021-06-11 | 本田技研工业株式会社 | Spot welding method |
| CN113134671A (en) * | 2021-03-22 | 2021-07-20 | 首钢集团有限公司 | Resistance spot welding method for welding plate group |
| CN113351974A (en) * | 2021-06-30 | 2021-09-07 | 新余新钢金属制品有限公司 | Aluminum-clad steel welding method |
| CN114192953A (en) * | 2021-12-20 | 2022-03-18 | 南昌江铃集团协和传动技术有限公司 | Secondary pulse welding process for galvanized plate |
| CN115070186A (en) * | 2022-07-20 | 2022-09-20 | 本钢板材股份有限公司 | Resistance spot welding method for hot-galvanized dual-phase steel |
| CN115138955A (en) * | 2021-03-31 | 2022-10-04 | 丰田自动车株式会社 | Resistance spot welding method and resistance spot welding device |
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| CN108581159A (en) * | 2018-04-28 | 2018-09-28 | 东北大学 | A kind of welding method of thermal neutron shielding stainless steel plate |
| CN109108069A (en) * | 2018-08-01 | 2019-01-01 | 上海宝钢包装钢带有限公司 | The milling method of Varying-thickness automobile B-column |
| CN109108069B (en) * | 2018-08-01 | 2020-08-07 | 上海宝钢包装钢带有限公司 | Rolling method of variable-thickness automobile B column |
| CN108890110A (en) * | 2018-09-10 | 2018-11-27 | 东北大学 | A kind of resistance spot welding process improving Q&P steel welded joint quality |
| CN109079304A (en) * | 2018-10-10 | 2018-12-25 | 鞍钢股份有限公司 | A kind of spot-welding technology method of carbon equivalent high cold-rolled biphase steel |
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| CN111856662A (en) * | 2020-03-10 | 2020-10-30 | 成都优博创通信技术股份有限公司 | Optical device coupling welding method |
| CN111673250B (en) * | 2020-06-09 | 2022-08-05 | 首钢集团有限公司 | Resistance spot welding method for passivated coated steel plate |
| CN111673250A (en) * | 2020-06-09 | 2020-09-18 | 首钢集团有限公司 | Resistance spot welding method for passivated coated steel plate |
| CN112695249A (en) * | 2020-12-11 | 2021-04-23 | 马鞍山钢铁股份有限公司 | 1800MPa grade double-sided non-uniform-thickness aluminum-silicon coating hot forming steel and resistance spot welding method thereof |
| CN113134671A (en) * | 2021-03-22 | 2021-07-20 | 首钢集团有限公司 | Resistance spot welding method for welding plate group |
| CN115138955A (en) * | 2021-03-31 | 2022-10-04 | 丰田自动车株式会社 | Resistance spot welding method and resistance spot welding device |
| CN113351974A (en) * | 2021-06-30 | 2021-09-07 | 新余新钢金属制品有限公司 | Aluminum-clad steel welding method |
| CN114192953A (en) * | 2021-12-20 | 2022-03-18 | 南昌江铃集团协和传动技术有限公司 | Secondary pulse welding process for galvanized plate |
| CN115070186A (en) * | 2022-07-20 | 2022-09-20 | 本钢板材股份有限公司 | Resistance spot welding method for hot-galvanized dual-phase steel |
| CN115070186B (en) * | 2022-07-20 | 2023-09-22 | 本钢板材股份有限公司 | Resistance spot welding method for hot dip galvanized dual-phase steel |
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