CN107891218A - A kind of thermoforming steel white body spot welding method - Google Patents
A kind of thermoforming steel white body spot welding method Download PDFInfo
- Publication number
- CN107891218A CN107891218A CN201710903262.2A CN201710903262A CN107891218A CN 107891218 A CN107891218 A CN 107891218A CN 201710903262 A CN201710903262 A CN 201710903262A CN 107891218 A CN107891218 A CN 107891218A
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- China
- Prior art keywords
- welding
- steel
- thermoforming
- spot welding
- white body
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/02—Pressure butt welding
-
- 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
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/34—Preliminary treatment
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Resistance Welding (AREA)
Abstract
The invention provides a kind of thermoforming steel white body spot welding method, step 1：The solder side of the two-layered steel plates of thermoforming steel automobile body-in-white is bonded to each other；Step 2：The two-layered steel plates are passed through into ceramic alignment pin clamping and positioning；Step 3：Treat to set an electrode cap respectively on the outside of at spot welding in the two-layered steel plates；Step 4：To application welding current and welding pressure between two electrode caps so that treat that welding point is melted and be solidified at spot welding in the two-layered steel plates.For the use of supporting thermoforming steel, the present invention is innovatively used as the positioning of fixture by the use of ceramic pins, pass through the use of ceramic alignment pin and welding condition, the welding positioning precision and service life of white body can not only be improved, product first-time qualification rate is improved simultaneously, production efficiency is improved, reduces the integrated cost in the workshop that is welded, thermoforming steel white body application field can also be made up puts into practice blank, is provided the foundation to formulate professional standard and improving bonding speed.
Description
Technical field
The present invention relates to a kind of method for the automobile body-in-white structural strength welding for being suitable for use with unimach, it is used for
Completing increases the white body spot welding of body structure intensity after vehicle body GEO tack weldings, belongs to field of automobile.
Background technology
It is strong based on solution strengthening, precipitation strength, crystal grain thinning, dislocation with the lifting to requirements such as automotive safety, energy-conservations
Change and the unimach of phase transformation strengthening (martensite) enters the production application stage.In order to improve and meet collision safety
Performance simultaneously improves car body component intensity, and the importance of the firm spot welding characteristics of ultrahigh-strength thermal forming and technology has just highlighted out.
Traditional automobile body-in-white uses galvanized sheet, and during two layers of zinc-plated plate weld, positioning is clamped using iron filings.
Due to the material property of high-strength thermal forming steel in itself, the welding technique of thermoforming steel white body need stronger welding pressure,
Longer weld interval and energy, therefore traditional alignment pin can not meet the fixture location requirement of high intensity, its wearability and strong
Degree does not all reach technological requirement, can not meet the requirement of weld size and stationary positioned dimensional accuracy.It is being unsatisfactory for the ring of precision
In the case of border, if two-layered steel plates directly overlap joint and precompressed occur space or appear in the feelings of the position welding of non-planning
Condition, there is large effect to the overall product quality of automobile and structural strength.
The content of the invention
The technical problem to be solved in the present invention is how the automobile body-in-white of unimach to be positioned and spot welding.
In order to solve the above-mentioned technical problem, the technical scheme is that providing a kind of thermoforming steel white body spot welding side
Method, it is characterised in that step is：
Step 1：The solder side of the two-layered steel plates of thermoforming steel automobile body-in-white is bonded to each other；
Step 2：The two-layered steel plates are passed through into ceramic alignment pin clamping and positioning；
Step 3：Treat to set an electrode cap respectively on the outside of at spot welding in the two-layered steel plates；
Step 4：To application welding current and welding pressure between two electrode caps so that treat spot welding in the two-layered steel plates
Place melts and is solidified into welding point.
Preferably, the electrode cap have passed through the Technology for Heating Processing for improving hardness.
Preferably, in the step 4, solder joint shear strength displacement≤5s/mm.
Preferably, in the step 4, electrode indent uniformity >=97%.
Preferably, in the step 4, when the lamella thickness in two-layered steel plates is 0.75~1mm, welding pressure 3.9
~4.3KN, weld interval are 330~440ms, and welding current is 10~12ms, a diameter of 16mm of electrode cap.
Preferably, in the step 4, when the lamella thickness in two-layered steel plates is 1.1~2mm, welding pressure be 4.4~
6KN, weld interval are 460~660ms, and welding current is 12.5~15.5ms, a diameter of 16~20mm of electrode cap.
Preferably, in the step 4, welding parameter is as shown in table 1：
The thermoforming steel welding parameter table of table 1
In table 1, thickness of slab represents the lamella thickness in two-layered steel plates, and contact surface diameter represents that electrode cap end face contacts with steel plate
The diameter in face
Compared with prior art, the present invention has the advantages that：
1st, the use of supporting thermoforming steel, electrode cap are heat-treated using high rigidity, improve matched clamp overall precision and resistance to
Grind service life；
2nd, it is safe the characteristics of having bending strength high and be electrically insulated using positioning of the ceramic pins as fixture, and can reduce
The workload of follow-up cleaning welding slag；
3rd, using new welding condition and the pattern of high intensity matched clamp, product first-time qualification rate is improved, is improved
Production efficiency；
4th, precision welding fixture supports the use, and starts with from station downtime is shortened, effectively reduces the workshop that is welded
Integrated cost；
5th, ceramic alignment pin and electrode cap briquetting through high rigidity Technology for Heating Processing are introduced into thermoforming steel spot welding neck first
Domain, advance the progress of welding integrated artistic.
Brief description of the drawings
Schematic diagram when Fig. 1 is thermoforming steel white body spot welding；
Fig. 2 is conventional panels and thermoforming steel welding pressure and thickness of slab relation comparison diagram；
Fig. 3 is conventional panels and thermoforming steel weld interval and thickness of slab relation comparison diagram；
Fig. 4 is conventional panels and thermoforming steel welding current and thickness of slab relation comparison diagram.
Embodiment
With reference to specific embodiment, the present invention is expanded on further.It should be understood that these embodiments are merely to illustrate the present invention
Rather than limitation the scope of the present invention.In addition, it is to be understood that after the content of the invention lectured has been read, people in the art
Member can make various changes or modifications to the present invention, and these equivalent form of values equally fall within the application appended claims and limited
Scope.
A kind of thermoforming steel white body spot welding method, step are：
Step 1：The solder side 1 of the two-layered steel plates of thermoforming steel automobile body-in-white is bonded to each other, as shown in Figure 1；
Step 2：Two-layered steel plates pass through the ceramic clamping and positioning of alignment pin 2；
Step 3：Treat that outside sets an electrode cap 3 respectively at spot welding in two-layered steel plates；Electrode cap 3 has been used at high rigidity heat
Science and engineering skill, to ensure the stability of size in white body welding process；
Step 4：To application welding current and welding pressure between two electrode caps 3 so that treated in two-layered steel plates at spot welding
Melt and be solidified into welding point.
The technical indicator of ceramic alignment pin is as follows：
1) superpower wearability：
Compressive strength (MPa)：2300
Bending strength (MPa)：240
Flexible ratio (GPa)：280
2) non-stick nature：Welding slag, the attachment of dust can effectively be reduced；
3) it is electrically insulated：Meet the strict global insulation technology code requirement of Volvo；
4) superhigh intensity under high temperature, heat resistance (DEG C)：1700
5) service life overlength：Ensure the minimum percent defective of welding procedure and minimum down time, effectively reduce weldering
Integrated cost between entrucking.
There is the model of ceramic pins used by the present embodiment：D15-040960385 (31915024), D13-034422378
(31915023), D15-040962889 (31553145).
The technical indicator of thermoforming steel spot welding is as follows：
1) spot-welded speed：2s/ points；
2) solder joint shear strength displacement：≤5s/mm；
3) electrode indent (thermoforming steel mother metal residual thickness) uniformity >=97%
4) welding pressure of welding gun is 2 times of common zinc-plated sheet material.
Many experiments process is carried out to traditional galvanized sheet and thermoforming steel of the present invention (boron steel-Boron-Steel), and controlled
Same thickness of slab is made, to carry out the contrast of welding parameter, so as to realize that soldering theory and practice are combined, draws the white car of thermosetting steel
The welding condition of body sets rule, realizes the application in actual production technique to the firm automobile body welding of thermoforming.According to point
Resistance parameter mark ES-6M2A-1K251-A* is welded, electrode parameter implemented according to ISO5821, stacking welding for carbon steel, high-strength
Spend the stacking welding of Coated Steels and sheet alloy GMT welding carries out the experimental exploring of welding parameter, experimental data is as follows：
The thermoforming steel welding parameter table of table 1
The conventional panels welding parameter table of table 2
Thermoforming steel with conventional panels welding parameter difference as shown in Table 1 and Table 2, press by conventional panels and the welding of thermoforming steel
Power and thickness of slab relation pair ratio as shown in figure 1, conventional panels and thermoforming steel weld interval with thickness of slab relation pair ratio as shown in Fig. 2
Conventional panels and thermoforming steel welding current and thickness of slab relation pair ratio are as shown in Figure 3.
As can be seen from the above data：
First, the application of welding current, voltage and weld interval on thermoforming steel is set, according to the difference of thickness of slab, change
Curve and the relatively common galvanized sheet of trend are almost consistent；
2nd, the white body welding pressure of thermoforming steel is higher compared to galvanized sheet starting point pressure requirements, with the increase of thickness of slab
Welding pressure amplification compared to galvanized sheet drops to 30% or so from 70%；
3rd, due to thermoforming steel crystal grain thinning, dislocation strengthening and phase transformation strengthening (martensite) the characteristics of, weld interval is compared
The amplification of galvanized sheet is 100% or so, it is necessary to which the longer welding dwell time is with burn through steel plate, inadequate welding dwell time
Can cause in an experiment rosin joint or weld strength not enough etc. various quality shortcomings the problem of, therefore enough weld intervals for heat into
Type has been just necessary；
4th, the welding current of thermoforming steel, it is very nearly the same compared to galvanized sheet, i.e., it is several with energy required during thickness of slab when welding
It is consistent；
5th, the welding parameter of Integrated comparative thermoforming steel (boron steel), more traditional galvanized sheet are keeping welding spot size and electrode
In the case of cap size, every welding parameter is required to lifting 30%~100% to meet the welding demand of thermoforming steel.
It is innovatively right as the positioning of fixture, and simultaneously by the use of ceramic pins for the use of supporting thermoforming steel, the present invention
Electrode cap briquetting has used high rigidity Technology for Heating Processing, to ensure the stability of size in white body welding process, improves supporting
Fixture overall precision and wear-resisting service life.
In terms of technological parameter, welded by constantly testing and detecting welding quality, welding shear strength displacement and test
Electrode indent after connecing etc., by solidifications such as the welding current of thermoforming steel, welding pressure and welding dwell times and retain
Come, start and establish a set of technical indicator of domestic thermoforming steel white body welding.
By the use of ceramic alignment pin and welding condition, the welding positioning precision of white body can be not only improved,
Blank can be put into practice with completion thermoforming steel white body application field simultaneously, be provided to formulate professional standard and improving bonding speed
Basis.
Claims (7)
1. a kind of thermoforming steel white body spot welding method, it is characterised in that step is：
Step 1：The solder side (1) of the two-layered steel plates of thermoforming steel automobile body-in-white is bonded to each other；
Step 2：The two-layered steel plates are passed through into ceramic alignment pin (2) clamping and positioning；
Step 3：Treat to set an electrode cap (3) on the outside of at spot welding respectively in the two-layered steel plates；
Step 4：To application welding current and welding pressure between two electrode caps (3) so that treat spot welding in the two-layered steel plates
Place melts and is solidified into welding point.
A kind of 2. thermoforming steel white body spot welding method as claimed in claim 1, it is characterised in that：Electrode cap (3) warp
The Technology for Heating Processing for improving hardness is crossed.
A kind of 3. thermoforming steel white body spot welding method as claimed in claim 1, it is characterised in that：In the step 4, solder joint
Shear strength displacement≤5s/mm.
A kind of 4. thermoforming steel white body spot welding method as claimed in claim 1, it is characterised in that：In the step 4, electrode
Indent uniformity >=97%.
A kind of 5. thermoforming steel white body spot welding method as claimed in claim 1, it is characterised in that：In the step 4, when two
When lamella thickness in layer steel plate is 0.75~1mm, welding pressure is 3.9~4.3KN, and weld interval is 330~440ms, weldering
It is 10~12ms, a diameter of 16mm of electrode cap to connect electric current.
A kind of 6. thermoforming steel white body spot welding method as claimed in claim 1, it is characterised in that：In the step 4, when two
When lamella thickness in layer steel plate is 1.1~2mm, welding pressure is 4.4~6KN, and weld interval is 460~660ms, welding electricity
Flow for 12.5~15.5ms, a diameter of 16~20mm of electrode cap.
A kind of 7. thermoforming steel white body spot welding method as claimed in claim 1, it is characterised in that：In the step 4, welding
Parameter is as shown in table 1：
The thermoforming steel welding parameter table of table 1
In table 1, thickness of slab represents the lamella thickness in two-layered steel plates, and contact surface diameter represents electrode cap end face and steel plate contact surface
Diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710903262.2A CN107891218A (en) | 2017-09-28 | 2017-09-28 | A kind of thermoforming steel white body spot welding method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710903262.2A CN107891218A (en) | 2017-09-28 | 2017-09-28 | A kind of thermoforming steel white body spot welding method |
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| CN107891218A true CN107891218A (en) | 2018-04-10 |
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ID=61802770
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| CN201710903262.2A Pending CN107891218A (en) | 2017-09-28 | 2017-09-28 | A kind of thermoforming steel white body spot welding method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109249118A (en) * | 2018-08-21 | 2019-01-22 | 上海交通大学 | Laminated plate based on electric resistance welding synchronizes compound two point progressive molding device and method |
| CN112570868A (en) * | 2020-12-11 | 2021-03-30 | 马鞍山钢铁股份有限公司 | Method for improving corrosion resistance of resistance spot welding spot of 1800 MPa-grade hot forming steel |
| CN112620906A (en) * | 2020-12-11 | 2021-04-09 | 马鞍山钢铁股份有限公司 | Method for improving corrosion resistance of resistance spot welding spot of 1500 MPa-grade hot forming steel |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109249118A (en) * | 2018-08-21 | 2019-01-22 | 上海交通大学 | Laminated plate based on electric resistance welding synchronizes compound two point progressive molding device and method |
| CN109249118B (en) * | 2018-08-21 | 2020-03-17 | 上海交通大学 | Laminated plate synchronous composite double-point progressive forming device and method based on resistance welding |
| CN112570868A (en) * | 2020-12-11 | 2021-03-30 | 马鞍山钢铁股份有限公司 | Method for improving corrosion resistance of resistance spot welding spot of 1800 MPa-grade hot forming steel |
| CN112620906A (en) * | 2020-12-11 | 2021-04-09 | 马鞍山钢铁股份有限公司 | Method for improving corrosion resistance of resistance spot welding spot of 1500 MPa-grade hot forming steel |
| CN112620906B (en) * | 2020-12-11 | 2022-08-16 | 马鞍山钢铁股份有限公司 | Method for improving corrosion resistance of resistance spot welding spot of 1500 MPa-grade hot forming steel |
| CN112570868B (en) * | 2020-12-11 | 2022-08-16 | 马鞍山钢铁股份有限公司 | Method for improving corrosion resistance of resistance spot welding spot of 1800 MPa-grade hot forming steel |
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Application publication date: 20180410 |