CN114985887A - Anti-warping multilayer board spot welding method - Google Patents
Anti-warping multilayer board spot welding method Download PDFInfo
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- CN114985887A CN114985887A CN202210737719.8A CN202210737719A CN114985887A CN 114985887 A CN114985887 A CN 114985887A CN 202210737719 A CN202210737719 A CN 202210737719A CN 114985887 A CN114985887 A CN 114985887A
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- 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
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- 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
- B23K11/36—Auxiliary equipment
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention discloses a spot welding method for a warping-preventing multilayer board, which comprises the following steps of S1: stacking the multilayer plates to form a workpiece to be welded and clamping the workpiece; s2 preforming: twisting the upper electrode and the lower electrode by taking a welding point as a welding area, and sequentially and discontinuously outputting preforming current to the workpiece in at least 3 oblique directions; s3 preforming maintenance: cooling and solidifying the preformed nugget under the prepressing pressure; s4 welding; s5 maintains: cooling and solidifying the nugget under the pre-pressing pressure; s6 stop. The improvement step S2, according to the characteristics of the thin and/or low strength plate and the thick and/or high strength plate, the size of the welding area is obtained by combining the pre-pressing pressure and the preheating temperature of the spot welding, and the circumferential torsional spot welding is carried out by taking the center of the welding area as the origin, so that the welding stress can be greatly dispersed, and the generation of warping is prevented; meanwhile, the welding time of the step S4 can be reduced by twisting and welding multiple points in the welding area, and the problem of welding point warping and breaking caused by residual stress after welding is reduced.
Description
Technical Field
The invention relates to the technical field of welding processes, in particular to a warping-preventing multi-layer plate spot welding method.
Background
Spot welding is a welding method in which a welding spot is formed between the contact surfaces of two overlapped workpieces by using a columnar electrode during welding. During spot welding, the workpieces are pressed to be in close contact, then current is switched on, the contact positions of the workpieces are melted under the action of resistance heat, and welding spots are formed after cooling and the workpieces are connected.
The electric cylinder medium-frequency inverter spot welding machine (capable of changing pressure in the welding process) is suitable for welding components with large plate thickness ratio difference, such as a central beam, and the like, and is used for welding in a high-low pressure and high-low current change matching mode to replace a traditional single-section fixed current fixed pressure limiting welding mode. The multi-section welding technology greatly improves the stability and high quality of the edges of thin plates and middle plates which are difficult to weld in the conventional welding mode.
In "a difference thick multilayer plate spot welding method" with an authorization publication number of CN 109773321B, there are described: s2 preforming and S3 preforming are added between S1 prepressing and S4 welding for maintenance, contact resistance of a welded workpiece is reconstructed, so that resistance distribution of a welding area on the workpiece is uniform during S4 welding, welding current density distribution among contact surfaces is uniform, and finally nuggets formed by welding are uniformly grown and distributed.
However, in the above spot welding method, since the preforming step S2 is added, the spot welding time is actually extended in addition to the original welding step S4, so that the welding instantaneous stress and the welding residual stress are increased. The welding transient stress can cause warping between the plates during welding, especially thinner and/or lower strength plates; the welding residual stress can cause vibration, impact and the like to cause the welding spot to warp and break during the use process.
Therefore, how to provide a method for welding a multilayer plate by spot welding with warpage prevention, so as to reduce the warpage problem caused by welding instantaneous stress and welding residual stress, is a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
Therefore, the invention provides a warping-preventing multilayer plate spot welding method to solve the related technical problems in the prior art.
In order to achieve the above purpose, the invention provides the following technical scheme:
a spot welding method for a warping-preventing multilayer board comprises the following steps:
s1, prepressing: stacking the multilayer boards to form a workpiece to be welded, spot welding the upper electrode and the lower electrode to contact the workpiece, and applying pre-pressing pressure to the workpiece to clamp the workpiece;
s2 preforming: electrifying the spot welding upper electrode and the spot welding lower electrode, twisting the upper electrode and the lower electrode by taking the spot to be welded as a welding area, and sequentially and discontinuously outputting preforming current to the workpiece in at least 3 oblique directions, so that a smaller preforming nugget is formed on the contact surface of the thinner and/or lower-strength plate side, and a larger preforming nugget is formed on the contact surface of the thicker and/or higher-strength plate side;
s3 preforming maintenance: cutting off the pre-forming current on the spot welding upper electrode and the spot welding lower electrode, and cooling and solidifying the pre-forming nugget generated by pre-forming under the pre-pressing pressure;
s4 welding: spot welding an upper electrode and a lower electrode to vertically clamp a workpiece and output welding current to the welding center of the workpiece, and heating the welding area on the workpiece to form a final nugget;
s5 maintains: cutting off welding current on the spot welding upper electrode and the spot welding lower electrode, and cooling and solidifying a nugget formed by welding under the prepressing pressure;
s6 rest: and (4) separating the spot welding upper electrode and the spot welding lower electrode from the workpiece until the next spot welding is started.
Further, in the step of preforming S2, the upper electrode and the lower electrode are twisted to the welding area to be welded, and the preforming current is outputted to the workpiece intermittently in at least 3 oblique directions, including the following steps:
s201: determining a central point O and a radius R of a welding domain;
s202: twisting the spot welding upper electrode and the spot welding lower electrode by taking the central point O of the welding area as an original point and taking the radius R as the length, so that the spot welding upper electrode and the spot welding lower electrode are inclined by a first vertical rotation angle, and outputting a preforming current by taking the contact point as a first spot welding point;
s203: taking the central point O of the welding area as an original point, twisting the spot welding upper electrode and the spot welding lower electrode by taking the radius R as the length, clockwise horizontally rotating to a second spot welding point by taking the first spot welding point as a starting point by a second angle, and outputting a preforming current at the second spot welding point;
s204: and taking the central point O of the welding area as an original point, twisting the spot welding upper electrode and the spot welding lower electrode by taking the radius R as the length, clockwise horizontally rotating the spot welding point to a third spot welding point by taking the second spot welding point as a starting point, and outputting a preforming current at the third spot welding point.
Further, in the step S203 and S204, the spot welding upper electrode and the spot welding lower electrode are welded in a vertically rotated first angle inclined state while the second spot welding point and the third spot welding point are welded.
Further, the first spot welding points, the second spot welding points and the third spot welding points are uniformly distributed at the center point O of the welding area.
Further, the first angle is 20-50 degrees, and the second angle and the third angle are both 120 degrees.
Further, in step S201, determining the radius R of the welding area includes the following calculation formula:
in the formula: r is the radius of the welding area; k is a spot welding coefficient; ρ 1 is the resistivity of the upper, thinner and/or lower strength sheet; ρ 2 is the resistivity of the thicker and/or higher strength sheet of the middle layer; ρ 3 is the resistivity of the underlying thicker and/or higher strength sheet; l1 is the thickness of the upper layer of thinner and/or lower strength panel; l2 is the thickness of the thicker and/or higher strength panel of the middle layer; l3 is the thickness of the lower thicker and/or higher strength panel; p is a pre-pressing pressure value; t is the temperature.
Further, the time interval is switched to be 100-150ms by the first spot welding point, the second spot welding point and the third spot welding point in sequence.
Furthermore, the spot welding upper electrode and the spot welding lower electrode are spot welding electrodes of a medium-frequency inverter welding machine.
Further, in the preform maintaining at step S3, the preform nugget produced by the preform is cooled and solidified at the pre-pressing pressure for 100-.
Further, in the welding of step S4, the time for spot welding the upper electrode and the lower electrode to vertically clamp and weld the workpiece is 150-.
The invention has the following advantages:
according to the method, the step S2 is improved, the size of a welding area is obtained by combining the pre-pressing pressure and the preheating temperature of spot welding according to the characteristics of a thin and/or low-strength plate and a thick and/or high-strength plate, and circumferential torsional spot welding is carried out by taking the center of the welding area as an origin, so that the welding stress can be greatly dispersed, and the generation of warping is prevented; meanwhile, the welding time of the step S4 can be reduced by twisting and welding multiple points in the welding area, the size difference between the side nuggets of the thin and/or low-strength plate and the side nuggets of the thick and/or high-strength plate is reduced, and the problem of welding point warping and breaking caused by residual stress after welding is reduced.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
FIG. 1 is a flow chart of a spot welding method for a warpage prevention multilayer board provided by the invention;
fig. 2 is a welding condition setting diagram of the anti-warping multilayer plate spot welding method provided by the invention.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to solve the related technical problems in the prior art, the embodiment of the application provides a welding method for preventing the warping of a multilayer board by spot welding, and aims to improve the welding quality of the multilayer board by improving the warping problem in the prior art in the welding of the multilayer board with the difference in strength and thickness. The welding method of the embodiment of the application is suitable for the combined spot welding of the multi-layer plates which are combined by the same plates but have larger plate thickness difference, the multi-layer plates which have the same plate thickness but have larger plate strength difference, the multi-layer difference strength difference thick plates which have different plate strength and different plate thickness, and the multi-layer plates of which the base materials and the contact resistance are not uniformly distributed.
It should be noted that the spot welder applied in the application is a medium-frequency inverter electric welder, is suitable for welding components with large plate thickness ratio difference such as a central beam, and is used for replacing a traditional single-section fixed current fixed pressure limited welding mode by high-low pressure and high-low current change matched welding.
As shown in fig. 1, the method comprises the following steps:
s1, prepressing: and stacking the multilayer plates to form a workpiece to be welded, spot welding the upper electrode and the lower electrode to contact the workpiece, and applying pre-pressing pressure to the workpiece to clamp the workpiece. And after the pre-pressing pressure is stable, reading a corresponding pressure value P, and keeping the pressure stable to perform welding operation.
S2 preforming: and electrifying the spot welding upper electrode and the spot welding lower electrode, twisting the upper electrode and the spot welding lower electrode to output preforming current to the workpiece in at least 3 oblique directions in sequence by taking the spot to be welded as a welding domain, so that a smaller preforming nugget is formed on the contact surface of the thinner and/or lower-strength plate side, and a larger preforming nugget is formed on the contact surface of the thicker and/or higher-strength plate side. This step is mainly to improve the problem that the welding is easy to warp in the prior art.
In the step of preforming S2, the upper electrode and the lower electrode are twisted by taking the welding point as a welding area, and the preforming current is output to the workpiece intermittently in at least 3 oblique directions, which comprises the following steps:
s201: the center point O and radius R of the weld field are determined. In this step, after the upper electrode and the lower electrode are clamped, the position of the welding area is determined, and meanwhile, when the upper electrode and the lower electrode are in a vertical state, the contact point of the upper electrode and the lower electrode with the upper plate and the lower plate is the central point O of the welding area. The radius R of the welding area needs to be determined according to the conditions of plate properties, pre-pressing pressure, temperature and the like, so that the welding stress is reduced in the welding process and after welding, and the influence of warping on the product quality is prevented. This step provides the following determination formula:
in the formula: r is the radius of a welding area; k is a spot welding coefficient; ρ 1 is the resistivity of the upper, thinner and/or lower strength sheet; ρ 2 is the resistivity of the thicker and/or higher strength sheet of the middle layer; ρ 3 is the resistivity of the underlying thicker and/or higher strength sheet; l1 is the thickness of the upper layer of thinner and/or lower strength panel; l2 is the thickness of the thicker and/or higher strength panel of the middle layer; l3 is the thickness of the lower thicker and/or higher strength panel; p is a pre-pressing pressure value; t is the temperature.
The characteristics of each plate are different, such as the thickness, the strength, the temperature and the like of the plate, the resistivity is different, and the pre-pressing pressure is also an important reference value. Illustrating the effect of the parameters on determining the radius of the weld zone: under the condition that the thickness of each layer of plate is determined, the resistivity is also determined, so that the radius R of a welding area is reduced when the preheating temperature is increased; meanwhile, when the pre-pressing pressure is increased, the joint tightness of each plate is higher, so that the radius R of the welding area is reduced.
S202: the center point O of a welding area is used as an original point, the radius R is used as the length, the spot welding upper electrode and the spot welding lower electrode are twisted, the pre-pressing pressure of the upper electrode and the pre-pressing pressure of the lower electrode on the multilayer board are not changed in the twisting process, the spot welding upper electrode and the spot welding lower electrode are inclined at a first vertical rotation angle, and the contact point is used as a first point welding point to output pre-forming current. In the step, the upper electrode and the lower electrode deflect around the central point O according to the difference of the calculated radius R, so that the first deflection angle of the upper electrode and the lower electrode is 20-50 degrees, namely the upper electrode and the lower electrode are in a deflection state to perform spot welding on a first spot welding point of the plate.
Through the process, the pre-forming current with short time and large intensity is output to the workpiece according to the welding performance of the plate, because the thickness or the strength of the workpiece is not consistent, the density of the pre-forming current is not uniform due to different resistances, and the heat generated between the contact surfaces of the welding area on the workpiece is not balanced, so that the thinner and/or lower strength sheet side contact surface forms a smaller preform nugget, the thicker and/or higher strength sheet side contact surface forms a larger preform nugget, and the output time of the preforming current is short, the preforming nugget formed on the contact surface of the thicker and/or higher-strength plate side is ensured not to be larger, the intensity of the preforming current is larger than that of the welding current, metal splashing is not generated on the contact surface of the thicker and/or higher-strength plate side, and the preforming nugget can be formed on the contact surface of the thinner and/or lower-strength plate side.
It should be noted that, the above steps are different from the prior art, by twisting the upper electrode and the lower electrode, the edge of the upper electrode and the lower electrode is contacted with the multilayer board for spot welding during welding, although a short-time high-strength preforming current is used, the preformed nugget formed on the contact surface of the thicker and/or higher-strength board side is smaller than that of the prior art, and the preformed nugget formed on the contact surface of the thinner and/or lower-strength board side is smaller than that of the prior art, so that the difference between the preformed nugget on the thinner and/or lower-strength board side and the preformed nugget on the thicker and/or higher-strength board side is reduced, and the concentrated stress during welding can be reduced to a certain extent; meanwhile, although the upper electrode and the lower electrode are in a deflection state in the welding process, the connecting line of the preformed nuggets on the side of the thin and/or low-strength plate and the preformed nuggets on the side of the thick and/or high-strength plate is not obvious in inclination, and the edges of the nuggets can be formed correspondingly when the second spot welding point and the third spot welding point are welded in the follow-up manner.
S203: taking a central point O of a welding area as an original point, twisting a spot welding upper electrode and a spot welding lower electrode by taking a radius R as a length, clockwise and horizontally rotating to a second spot welding point by taking a first spot welding point as a starting point by a second angle, and outputting a preforming current at the second spot welding point;
s204: and taking the central point O of the welding area as an original point, twisting the spot welding upper electrode and the spot welding lower electrode by taking the radius R as the length, clockwise horizontally rotating the spot welding point to a third spot welding point by taking the second spot welding point as a starting point, and outputting a preforming current at the third spot welding point. Preferably, the first spot welding points, the second spot welding points and the third spot welding points are uniformly distributed at a central point O of the welding area. The second angle and the third angle are both 120 degrees.
In the process, when the second spot welding point and the third spot welding point are welded, the spot welding upper electrode and the spot welding lower electrode are welded in a vertical rotating and first angle inclining state. After the welding point of the previous point is finished, the upper electrode and the lower electrode return to the vertical state, and then deflection is carried out to the welding point of the next point. The advantage of this process is that the multilayer sheet can be clamped when the upper and lower electrodes are twisted to a vertical state, enabling preform maintenance.
It should be noted that this step S204 and the step S3 can be performed alternately, and the effect is better. Preferably, the first spot welding point, the second spot welding point and the third spot welding point are sequentially switched for 150ms, so that sufficient cooling and solidification time can be ensured.
S3 preform maintenance: the pre-forming current for spot welding the upper electrode and the lower electrode is cut off, and the pre-formed nugget produced by pre-forming is cooled and solidified under the pre-pressing pressure. In the preform maintaining step S3, the preform nugget produced by the preform is cooled and solidified for 100-150ms under the pre-pressing pressure.
S4 welding: and the spot welding upper electrode and the spot welding lower electrode vertically clamp the workpiece and output welding current to the welding center of the workpiece, and the welding area on the workpiece is heated to form a final nugget. The time for vertically clamping and welding the workpiece by the spot welding upper electrode and the spot welding lower electrode is 150-200 ms. This step differs from the prior art which uses a longer welding current, and requires only a short time of spot welding because of the formation of the preformed nuggets already on the side of the thinner and/or lower strength sheet and on the side of the thicker and/or higher strength sheet, due to the welding of the first spot weld, the second spot weld and the third spot weld in the weld zone. The welding in the step can be connected and fused with the nuggets formed in the welding process of the first spot welding point, the second spot welding point and the third spot welding point to form stable welding points, and the welding stress is dispersed by the first spot welding point, the second spot welding point and the third spot welding point, so that the warping problem caused by the welding stress is reduced.
S5 maintaining: the welding current of the spot welding upper electrode and the spot welding lower electrode is cut off, and the nugget formed by welding is cooled and solidified under the prepressing pressure.
S6 rest: and (4) separating the spot welding upper electrode and the spot welding lower electrode from the workpiece until the next spot welding is started.
Based on the above process method, the present application also provides the following verification examples:
referring to fig. 2, fig. 2 is a diagram illustrating welding condition setting.
TABLE 1 frequency of electrode exchange
According to the method, through the improvement of the step S2, the size of a welding area is obtained according to the characteristics of a thin and/or low-strength plate and a thick and/or high-strength plate and the combination of the pre-pressing pressure and the preheating temperature of spot welding, and the circumferential torsion spot welding is carried out by taking the center of the welding area as an origin, so that the welding stress can be greatly dispersed, and the generation of warping is prevented; meanwhile, the welding time of the step S4 can be reduced by twisting and welding multiple points in the welding area, the size difference between the side nuggets of the thin and/or low-strength plate and the side nuggets of the thick and/or high-strength plate is reduced, and the problem of welding point warping and breaking caused by residual stress after welding is reduced.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. A spot welding method for a warping-preventing multilayer board is characterized by comprising the following steps:
s1, prepressing: stacking the multilayer boards to form a workpiece to be welded, spot welding an upper electrode and a lower electrode to contact the workpiece, and applying pre-pressing pressure to the workpiece to clamp the workpiece;
s2 preforming: electrifying the spot welding upper electrode and the spot welding lower electrode, twisting the upper electrode and the lower electrode by taking the spot to be welded as a welding area, and sequentially and discontinuously outputting preforming current to the workpiece in at least 3 oblique directions, so that a smaller preforming nugget is formed on the contact surface of the thinner and/or lower-strength plate side, and a larger preforming nugget is formed on the contact surface of the thicker and/or higher-strength plate side;
s3 preforming maintenance: cutting off the pre-forming current on the spot welding upper electrode and the spot welding lower electrode, and cooling and solidifying the pre-forming nugget generated by pre-forming under the pre-pressing pressure;
s4 welding: the spot welding upper electrode and the spot welding lower electrode vertically clamp the workpiece and output welding current to the welding center of the workpiece, and the welding area on the workpiece is heated to form a final nugget;
s5 maintaining: cutting off welding current on the spot welding upper electrode and the spot welding lower electrode, and cooling and solidifying a nugget formed by welding under the prepressing pressure;
s6 rest: and (4) spot welding the upper electrode and the lower electrode away from the workpiece until the next spot welding is started.
2. The method of spot welding a warpage-preventing multi-layer plate as recited in claim 1, wherein in the step of preforming at S2, the upper electrode and the lower electrode are twisted for a welding area with a welding point to output a preforming current to the workpiece intermittently in at least 3 oblique directions, comprising the steps of:
s201: determining a central point O and a radius R of a welding domain;
s202: twisting the spot welding upper electrode and the spot welding lower electrode by taking the central point O of the welding area as an original point and taking the radius R as the length, so that the spot welding upper electrode and the spot welding lower electrode are inclined by a first vertical rotation angle, and outputting a preforming current by taking the contact point as a first spot welding point;
s203: taking a central point O of a welding area as an original point, twisting a spot welding upper electrode and a spot welding lower electrode by taking a radius R as a length, clockwise and horizontally rotating to a second spot welding point by taking a first spot welding point as a starting point by a second angle, and outputting a preforming current at the second spot welding point;
s204: and taking the central point O of the welding area as an original point, twisting the spot welding upper electrode and the spot welding lower electrode by taking the radius R as the length, clockwise horizontally rotating the spot welding point to a third spot welding point by taking the second spot welding point as a starting point, and outputting a preforming current at the third spot welding point.
3. The spot welding method of a warpage preventing multi-layer plate as claimed in claim 2, wherein the spot welding upper electrode and the lower electrode are welded in a vertically rotated first angle inclined state while the second spot welding point and the third spot welding point are welded in steps S203 and S204.
4. The method of spot welding a warpage-preventing multi-layer plate as recited in claim 2, wherein the first spot welding point, the second spot welding point and the third spot welding point are uniformly distributed at a center point O of the welding area.
5. The method of spot welding a warpage-preventing multi-layer plate as recited in claim 2, wherein the first angle is 20 to 50 degrees, and the second and third angles are both 120 degrees.
6. The anti-warping multi-layer plate spot welding method according to claim 2, wherein in step S201, determining the radius R of the welding field includes the following calculation formula:
in the formula: r is the radius of a welding area; k is a spot welding coefficient; ρ 1 is the resistivity of the upper, thinner and/or lower strength sheet; ρ 2 is the resistivity of the thicker and/or higher strength sheet of the middle layer; ρ 3 is the resistivity of the thicker and/or higher strength sheet of the bottom layer; l1 is the thickness of the upper layer of thinner and/or lower strength board material; l2 is the thickness of the thicker and/or higher strength panel of the middle layer; l3 is the thickness of the lower thicker and/or higher strength panel; p is a pre-pressing pressure value; t is the temperature.
7. The spot welding method of a warpage preventing multi-layer plate as claimed in claim 2, wherein the time interval for switching from the first spot welding point, the second spot welding point and the third spot welding point in sequence is 100-150 ms.
8. The warp-resistant multiwall plate spot welding method of claim 1, wherein the spot welding upper electrode and the spot welding lower electrode are spot welding electrodes of a medium frequency inverter welder.
9. The spot welding method of a warpage-preventing multi-layer plate as claimed in claim 1 or 2, wherein in the step S3 of maintaining the preform, the preform nugget produced by the preform is cooled and solidified under the pre-pressing pressure for 100-150 ms.
10. The spot welding method of the warpage-preventing multi-layer plate as set forth in claim 1 or 2, wherein in the welding in step S4, the time for the spot welding upper and lower electrodes to vertically hold and weld the workpiece is 150-200 ms.
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| US20120074103A1 (en) * | 2010-09-27 | 2012-03-29 | Honda Motor Co., Ltd. | Seam welding warpage prevention method and apparatus |
| CN102416524A (en) * | 2010-09-27 | 2012-04-18 | 本田技研工业株式会社 | Seam welding warpage prevention method and apparatus |
| WO2016181996A1 (en) * | 2015-05-11 | 2016-11-17 | 新日鐵住金株式会社 | Spot welding method |
| CN108971722A (en) * | 2018-07-17 | 2018-12-11 | 上海空间推进研究所 | The process of accurate control band resistance spot welding process characteristic and joint quality |
| CN109773321A (en) * | 2019-01-31 | 2019-05-21 | 上海梅达焊接设备有限公司 | A kind of pressure difference thickness multi-layer board spot welding method |
| CN112317935A (en) * | 2020-10-22 | 2021-02-05 | 中车青岛四方机车车辆股份有限公司 | Resistance spot welding device and method |
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