CN108971722A - The process of accurate control band resistance spot welding process characteristic and joint quality - Google Patents
The process of accurate control band resistance spot welding process characteristic and joint quality Download PDFInfo
- Publication number
- CN108971722A CN108971722A CN201810786576.3A CN201810786576A CN108971722A CN 108971722 A CN108971722 A CN 108971722A CN 201810786576 A CN201810786576 A CN 201810786576A CN 108971722 A CN108971722 A CN 108971722A
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- welding
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- test specimen
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Classifications
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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
-
- 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
-
- 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
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/12—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to investigating the properties, e.g. the weldability, of materials
- B23K31/125—Weld quality monitoring
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Quality & Reliability (AREA)
- Resistance Welding (AREA)
Abstract
The invention discloses the processes of a kind of accurate control band resistance spot welding process characteristic and joint quality, welding object is the stainless steel band of 0.5~1.0mm thickness, integrated application optimal control electrode pressure, electrode shape, squeeze time, pre- thermocurrent, preheat conduction time, welding current, weld time, after press the time, the method of the parameters such as spot pitch, it eliminates welding process splashing and pad surface is burnt, accurately nugget is controlled in the forming dimension of three-dimensional, reduce the degree of fluctuation of joint bending stiffness, the quality of welding spot of final gained connector all meets the I grade requirement of QJ1289, our unit's resistance spot welding first-time qualification rate is promoted to 100% from original 80%.
Description
Technical field
The present invention relates to resistance spot welding fields, and in particular to a kind of accurately control band resistance spot welding process characteristic and connector
The process of quality.
Background technique
With the fast development of Space Dynamic's technology, there is a large amount of pressure vessel in current space propulsion system,
These pressure vessels are generally fixed with stainless steel band, and the manufacturing technology of such band is based on resistance spot welding.
Resistance spot welding is called piezoresistive spot welding, refers under the effect of the pressure, to welded piece partially over instantaneous huge
High current will be melted around contact point to form a kind of welding method of combination.Although this method structure, principle and equipment letter
It is single, and applied in nearly all model in unit for many years, however original welding technique under-reserve, related process
Electric parameter setting is inaccurate rationally to lead to the presence of some problems in production process always, and such as splash serious, pad surface
Burn, nugget size and Mechanical Fluctuation are larger, these phenomenons significantly reduce the welding process stability of band and primary
Qualification rate.
Summary of the invention
In order to accurately control band resistance spot welding process characteristic and joint quality, in all kinds of parameters of analyzing and researching to spot welding
On the basis of the affecting laws of journey and quality, the present invention provides a kind of accurate control band resistance spot welding process characteristic and connector matter
The process of amount, integrated application coordination electrode pressure, electrode shape, squeeze time, pre- thermocurrent, preheating conduction time,
The parameters such as welding current, weld time, rear pressure time, spot pitch, eliminate welding process wild effect and raising
Solder yield.
The welding object of the process of accurate control band resistance spot welding process characteristic and joint quality of the invention is
The stainless steel band of 0.5~1.0mm thickness is specifically realized according to the following steps:
S1, the surface to be welded periphery of test specimen to be welded is subjected to oil removing, cleaning and drying；
Electrode tool used in S2, production welding machine, material (the generally beryllium tungsten copper of upper/lower electrode is determined according to welding demand
Or chromium-zirconium-copper), shape (generally flat circle or hemisphere), size, roughness (general require be not more than 6.3 μm) and concentricity
(general to require to be not more than 0.05mm)；
Welding main program in S3, modulation welding machine, is arranged electrode pressure (generally according to the material of test specimen to be welded and thickness
1.6~3.9kN), squeeze time (generally 500~800ms), pre- thermocurrent (generally 1500~3000A), preheating be powered when
Between (generally 300~400ms), welding current (generally 4500~7000A), the weld time (generally 100~
200ms), numerical value such as time (generally 500~1000ms) are pressed afterwards；
S4, test specimen to be welded is assembled by certain form, and guarantees faying surface gap no more than 0.05mm；
S5, the test specimen to be welded assembled is placed on lower electrode, triggering welder switch carries out first time spot welding, and point is soldered
At rear mobile test specimen to second solder joint predetermined position, distance between two points are generally at least 8~10mm；Again trigger switch into
Second of spot welding of row is repeated several times above procedure, is finally completed the welding of all default solder joints on the band；
S6, welding piece is divided into two class of nugget size testpieces and anti-shearing force testpieces, and respectively spot welding 6 into
Row relevant item detects, and requires to compare with the I grade of QJ1289 after record measured result.
Compared with prior art, the invention has the following advantages:
Integrated application optimal control electrode pressure, electrode shape, squeeze time, pre- thermocurrent, preheating conduction time, weldering
The method for connecing the parameters such as electric current, weld time, rear pressure time, spot pitch, eliminates welding process and splashes and solder joint table
Face is burnt, and is accurately controlled nugget in the forming dimension of three-dimensional, is reduced the degree of fluctuation of joint bending stiffness, final institute
The quality of welding spot of connector all meets the I grade of QJ1289 and requires, by our unit's resistance spot welding first-time qualification rate from original
80% is promoted to 100%.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon:
Fig. 1 is the assembling schematic diagram in the embodiment of the present invention in step S4；
In figure: 1 and 5 indicate band and Electrodes, and 2 and 4 indicate band bulk resistance, and 3 indicate band contact electricity
Resistance.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, several changes and improvements can also be made.These belong to the present invention
Protection scope.
Using locally overlapped, mode carries out resistance spot welding to rectangular plate test specimen in following embodiment, and the base material trade mark is
1Cr18Ni9Ti or 06Cr18Ni11Ti, plate thickness are respectively 0.5/0.8/1.0mm.
Embodiment
S1, the surface to be welded periphery of test specimen to be welded is carried out oil removing (organic matter), cleaning (dehydrated alcohol) and drying (80 DEG C/
1h)。
Electrode tool used in S2, production welding machine determines that the material of upper/lower electrode is chromium-zirconium-copper, and end surface shape is flat circle
Shape, powering on polar diameter is 6mm, and lower electrode diameter is 12mm, and upper and lower surface roughness is 6.3 μm, and concentricity actual measurement is
0.04mm。
Welding main program in S3, modulation welding machine is 1.8kN according to the material of test specimen to be welded and thickness setting electrode pressure
(with a thickness of the band of 0.5mm, similarly hereinafter)/3.0kN (0.8mm is thick)/3.6kN (1.0mm is thick), squeeze time 500ms, pre- thermoelectricity
Stream is 1800A (0.5mm is thick)/2600A (0.8mm is thick)/3000A (1.0mm is thick), preheating conduction time is 320ms, welding current
It is for 4800A (0.5mm is thick)/6400A (0.8mm is thick)/7000A (1.0mm is thick), weld time 160ms, rear pressure time
800ms。
S4, test specimen to be welded is assembled by the form of Fig. 1, actual measurement faying surface gap is 0.02mm.
S5, the test specimen to be welded assembled is placed on lower electrode, triggering welder switch carries out first time spot welding.Point is soldered
At rear mobile test specimen to second solder joint predetermined position, it is ensured that two spot pitch >=8 (0.5mm is thick)/9 (0.8mm is thick)/10mm
(1.0mm is thick), trigger switch carries out second of spot welding again.Above procedure is repeated several times, is finally completed all pre- on the band
If the welding of solder joint.Welding process is surveyed without any splashing and pad surface is without blackening of burning.
S6, welding piece is divided into two class of nugget size testpieces and anti-shearing force testpieces, and respectively spot welding 6 into
The detection of row relevant item.Final actual measurement nugget average diameter is all larger than 2.5mm (0.5mm is thick)/3.7mm (0.8mm is thick)/4.1mm
(1.0mm is thick) surveys nugget penetration rate in 50%~80% range, and actual measurement connector anti-shearing force is all larger than 2355N
(0.5mm is thick)/4650N (0.8mm is thick)/6495N (1.0mm is thick), all meets the I grade requirement of QJ1289.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make a variety of changes or modify within the scope of the claims, this not shadow
Ring substantive content of the invention.In the absence of conflict, the feature in embodiments herein and embodiment can any phase
Mutually combination.
Claims (6)
1. a kind of process of accurate control band resistance spot welding process characteristic and joint quality, which is characterized in that including such as
Lower step:
S1, the surface to be welded periphery of test specimen to be welded is subjected to oil removing, cleaning and drying；
Electrode tool used in S2, production welding machine, material, shape, size, the roughness of upper/lower electrode are determined according to welding demand
And concentricity；
S3, modulation welding machine in welding main program, according to the material of test specimen to be welded and thickness setting electrode pressure, squeeze time,
Pre- thermocurrent, preheating conduction time, welding current, weld time, rear pressure time；
S4, test specimen to be welded is assembled by certain form, and guarantees that faying surface gap is suitable；
S5, the test specimen to be welded assembled is placed on lower electrode, triggering welder switch carries out first time spot welding, after the completion of spot welding
For mobile test specimen to second solder joint predetermined position, trigger switch carries out second of spot welding again, above procedure is repeated several times, finally
Complete the welding of all default solder joints on the band；
S6, welding piece is divided into two class of nugget size testpieces and anti-shearing force testpieces, and respectively spot welding 6 to carry out phase
Item detection is closed, is compared after recording measured result with the requirement of the I grade of QJ1289.
2. process according to claim 1, which is characterized in that the material of the electrode in the step S2 is beryllium tungsten copper
Or chromium-zirconium-copper, shape are that flat circle or hemisphere, size and spot size cooperation, roughness requirements are not more than 6.3 μm and concentricity
It is required that being not more than 0.05mm.
3. process according to claim 1, which is characterized in that parameter and band specification phase in the step S3
It closes, wherein electrode pressure is 1.6~3.9kN, squeeze time is 500~800ms, pre- thermocurrent is 1500~3000A, preheating
Conduction time is 300~400ms, welding current is 4500~7000A, the weld time is 100~200ms, the rear pressure time
For 500~1000ms.
4. process according to claim 1, which is characterized in that the test specimen in the step S4 need to guarantee to take when assembling
Interface gap is not more than 0.05mm.
5. process according to claim 1, which is characterized in that spot pitch in the step S5 not less than 8~
10mm。
6. process according to claim 1, which is characterized in that the actual measurement nugget average diameter in the step S6 is equal
2.5mm/3.7mm/4.1mm must be greater than, actual measurement nugget penetration rate must survey connector anti-shearing force in 50%~80% range
2355N/4650N/6495N must be greater than, i.e., all test specimens must meet the I grade requirement of QJ1289.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810786576.3A CN108971722A (en) | 2018-07-17 | 2018-07-17 | The process of accurate control band resistance spot welding process characteristic and joint quality |
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| CN201810786576.3A CN108971722A (en) | 2018-07-17 | 2018-07-17 | The process of accurate control band resistance spot welding process characteristic and joint quality |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111421212A (en) * | 2019-01-10 | 2020-07-17 | 罗伯特·博世有限公司 | Method for checking welding tongs for resistance welding of workpieces |
| CN113146007A (en) * | 2021-04-27 | 2021-07-23 | 东风柳州汽车有限公司 | Method and device for determining welding lap amount of resistance spot welding |
| CN114985887A (en) * | 2022-06-22 | 2022-09-02 | 天津博世丰通科技有限公司 | Anti-warping multilayer board spot welding method |
| CN115026398A (en) * | 2021-06-30 | 2022-09-09 | 天津七所高科技有限公司 | Dynamic preheating welding method for aluminum alloy spot welding |
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| CN106363288A (en) * | 2016-09-14 | 2017-02-01 | 重庆科技学院 | Resistance spot welding technology for improving quality of welding spots of dual-phase steel |
| KR20180006154A (en) * | 2016-07-08 | 2018-01-17 | 헤베이 리신 테크놀로지 컴퍼니 리미티드 | Metal Sheets Spot Welding with Inoculation Agents |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111421212A (en) * | 2019-01-10 | 2020-07-17 | 罗伯特·博世有限公司 | Method for checking welding tongs for resistance welding of workpieces |
| CN113146007A (en) * | 2021-04-27 | 2021-07-23 | 东风柳州汽车有限公司 | Method and device for determining welding lap amount of resistance spot welding |
| CN115026398A (en) * | 2021-06-30 | 2022-09-09 | 天津七所高科技有限公司 | Dynamic preheating welding method for aluminum alloy spot welding |
| CN114985887A (en) * | 2022-06-22 | 2022-09-02 | 天津博世丰通科技有限公司 | Anti-warping multilayer board spot welding method |
| CN114985887B (en) * | 2022-06-22 | 2023-07-28 | 天津翔铄车身科技有限公司 | Spot welding method for warpage-preventing multilayer board |
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Application publication date: 20181211 |