CN101533046A - Method for measuring constriction resistance of sheet spot-welding - Google Patents
Method for measuring constriction resistance of sheet spot-welding Download PDFInfo
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- CN101533046A CN101533046A CN200810034660A CN200810034660A CN101533046A CN 101533046 A CN101533046 A CN 101533046A CN 200810034660 A CN200810034660 A CN 200810034660A CN 200810034660 A CN200810034660 A CN 200810034660A CN 101533046 A CN101533046 A CN 101533046A
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Abstract
The invention discloses a method for measuring constriction resistance of sheet spot-welding. The method is realized by the steps of: superposing two identical work-piece samples, clamping the two identical work-piece samples between an upper electrode and a lower electrode, simulating sheet spot-welding by heating and pressurizing, respectively measuring both total resistance between the electrodes and the work-piece samples and total resistance between the two electrodes, and finally figuring out the constriction resistance between the two work-piece samples according to the measured total resistance values. The method realizes the measurement of the constriction resistance by simulating the sheet spot-welding by heating and pressurizing and directly measuring each total resistance so as to avoid errors and precisely obtain the constriction resistance of sheet spot-welding.
Description
Technical field
The present invention relates to the measuring technique of contact resistance, more particularly, relate to a kind of measuring method of constriction resistance of sheet spot-welding, this measuring method can accurately be measured the contact resistance of thin plate spot welding.
Background technology
Contact resistance is important parameter in the resistance welded process, plays an important role for setting up early stage stable field of welding temperature and obtaining high-quality solder joint, and also being influences shape of nugget, quality, electrode erosion and one of the principal element of splashing.Such environmentally friendly machine that existing household electrical appliances, automobile are are particularly newly researched and developed with thin plate, the most tangible characteristics are exactly to contain different surface treatment retes, it is to the resistance welded process influence, mainly show as the change of temperature field that the difference of contact resistance causes, therefore must accurately measure contact resistance.
At present, the ultimate principle of measurement contact resistance is all fallen by measurement surface of contact both end voltage and is obtained, and promptly traditional four-wire method falls by two line end measuring voltages, and other two line ends load also measures electric current, and contact resistance equals the ratio of voltage drop and electric current.Generally, if select constant-current supply, only need record voltage drop can obtain contact resistance, but key is how accurately to record this voltage drop.
In recent years, both at home and abroad research institution has accurately done many effort aspect the measurement at the research contact resistance, typically have: one, Southeast China University has researched and developed the measuring system of a cover metal material surface direct current contact resistance, is used to estimate the conductive capability of various surface-treated metal spares, the electromagnetic screen ability of evaluation metal shell spare.It thinks that contact resistance is much larger than mother metal resistance, thereby mother metal resistance can be ignored, therefore with the overall electrical resistance that records as contact resistance value, but, the resistance of electrode and workpiece (being mother metal resistance), possible error is little at normal temperatures, and when resistance spot welding process relates to higher temperature, resistance can sharply increase, and therefore can not simply ignore; Two, Technical University Of Denmark is on the basis of the heating that utilizes the thermal simulation instrument, pressurization function, directly voltage drop and obtain contact resistance value between test piece.But it has been ignored equally when measuring, and can introduce a small amount of mother metal resistance and contact resistance, thereby this system is not suitable for the measurement thin plate, particularly contains the contact resistance of surface-treated thin plate.In addition,, easily make workpiece produce the phenomenon of temperature field skewness, thereby bring uncertain factor for the degree of accuracy of measured value and showing property of repetition by the electrifying electrodes heating.
U.S. Pat 6208146B1 has disclosed a kind of measuring contact resistance device and method that is used for the spot welding analog computation, this system has adopted to be measured resistance between power-on and power-off electrode resistances and lifting workpiece and derives contact resistance value between workpiece, its prerequisite must be a workpiece resistance, upper/lower electrode resistance is known, (can obtain workpiece and electrode resistance rate) by consulting reference, but for different steel grades, not having complete database can be for inquiry, and the various criterion storeroom differs greatly, can introduce certain error by resistivity calculating electrode and workpiece resistance, in addition, it also reckons without at high temperature, the rapid increase of masterbatch resistance and the influence that brings.
Publication number is the test structure and the method for a kind of contact resistance of probe of CN1482468, adopt the simple equation relational expression to parse contact resistance of probe, but this method is only applicable to the contact resistance between probe and workpiece, and can't obtain the contact resistance between workpiece and workpiece.
In sum, there is the shortcoming of two aspects in the measurement of contact resistance at present: 1, introduced electrode resistance, workpiece resistance equal error in the gained contact resistance; 2, do not consider that the spot welding contact resistance value is to the susceptibility of temperature and the inhomogeneity requirement in temperature field when measuring.Therefore, also there is not at present a kind of method that can accurate, free from error measurement constriction resistance of sheet spot-welding.
Summary of the invention
At the above-mentioned shortcoming that exists in the prior art, the purpose of this invention is to provide a kind of measuring method of constriction resistance of sheet spot-welding, this measuring method can accurately be measured the contact resistance of thin plate spot welding, and avoids introducing error.
For achieving the above object, the present invention adopts following technical scheme:
The concrete steps of the measuring method of this constriction resistance of sheet spot-welding are as follows:
A. two identical workpiece samples is stacked and be located between identical upper and lower two electrodes;
B. heat by the peripheral hardware temperature control box, and make the temperature inside the box reach assigned temperature;
C. upper and lower two electrodes and workpiece sample are forced into specified pressure, and keep stable;
D. distinguish all-in resistance and two interelectrode all-in resistances between potential electrode and workpiece sample;
E. each total resistance value by recording among the step D calculates the contact resistance between two workpiece samples.
The measuring process of described each total resistance value of step D is as follows:
D1. between upper and lower two electrodes, load constant current source;
Voltage drop between the workpiece sample of D2. measuring an electrode and joining;
D3. the voltage drop between the electrode among the measuring process D2 and another workpiece sample;
D4. measure two interelectrode voltage drops;
D5. by the relation of resistance and voltage, calculate electrode respectively and total resistance value, this electrode and another workpiece sample between the workpiece sample of joining between total resistance value and two interelectrode total resistance values.
Each total resistance value among the described step D is directly measured by adopting micro-ohm resistance measuring instrument and multichannel measurement probe.
In the described step e, the calculation equation of the contact resistance value between two workpiece samples is as follows:
R1＝r1+r2+r3；
R2＝r1+r2+2r3+r4；
R3＝2r1+2r2+2r3+r4；
Calculate r4=R3-2R1 by above-mentioned three equations;
In the formula, R1 is the total resistance value between electrode and the workpiece sample that joins; R2 is the total resistance value between this electrode and another workpiece sample; R3 is two interelectrode total resistance values; R1 is an electrode resistance value; R2 is the contact resistance value between electrode and the workpiece sample that joins; R3 is a workpiece sample resistance value; R4 is the contact resistance value between two workpiece samples.
In technique scheme, the measuring method of constriction resistance of sheet spot-welding of the present invention is earlier by stacked with two identical workpiece samples and be located between identical upper and lower two electrodes; Simulate thin plate spot welding by heating, pressurization then; Distinguish all-in resistance and two interelectrode all-in resistances between potential electrode and workpiece sample again; Calculate contact resistance between two workpiece samples by each total resistance value that records at last.This measuring method is simulated and is directly measured each all-in resistance and calculate by heating, pressurization, can avoid introducing various errors, thereby accurately measure the contact resistance of thin plate spot welding.
Description of drawings
Fig. 1 is the process flow diagram of the measuring method of constriction resistance of sheet spot-welding of the present invention;
Fig. 2 is the pressurization of adopting according to one embodiment of the invention, the structural representation of heating analogue means;
Fig. 3 is the structure enlarged drawing of A portion among Fig. 2;
Fig. 4 is the resistance simulation synoptic diagram of electrode shown in Fig. 3 and workpiece sample.
Embodiment
Further specify technical scheme of the present invention below in conjunction with drawings and Examples.
See also shown in Figure 1, the concrete steps of the measuring method of constriction resistance of sheet spot-welding of the present invention are: earlier the workpiece sample of two identical (are uniform thickness, with material and same surface treatment) is carried out stackedly up and down, and be located between upper and lower two electrodes of identical (promptly with the same profile of material); Temperature control box by peripheral hardware heats then, and makes the temperature inside the box reach assigned temperature; Again upper and lower two electrodes and workpiece sample are forced into specified pressure, and keep stable, thus the actual two-sided single-point welding of thin plate of simulation; And then all-in resistance and two interelectrode all-in resistances between difference potential electrode and workpiece sample; Each total resistance value by recording calculates two contact resistances between the workpiece sample at last.
See also Fig. 2, shown in Figure 3, the sample simulation thin plate spot welding of measuring method of the present invention can be adopted an analogue means 10, this analogue means 10 comprises a temperature control box 11 and a pressure-producing part, temperature control box 11 seal closures are located at outside two electrodes, and can be by on the basis of temperature controller in conjunction with PID control, add electric voltage feed forward control eliminating the influence of voltage ripple of power network, thereby adding in can guard box is thermally-stabilised; Pressure-producing part comprises fixing upper and lower fixed beam 121,122, trave lling girder 123, screw mandrel 124 and servomotor 125, temperature control box 11 and screw mandrel 124 are located between the upper and lower fixed beam 121,122, trave lling girder 123 is connected with top electrode 131, drive screw mandrel 124 by servomotor 125, and drive trave lling girder 123 liftings, thereby realize that top electrode 131 presses down workpiece sample 141.
Please in conjunction with Fig. 3, shown in Figure 4, because upper and lower electrode 131,132 and upper and lower workpiece sample 141,142 are symmetrically distributed, can think that the resistance of upper and lower electrode 131,132 equates, top electrode 131 equates with the contact resistance of 132 of following workpiece sample 142 and bottom electrodes that with the contact resistance of 141 on last workpiece sample the resistance of upper and lower workpiece sample 141,142 also equates.
Define earlier: R1 is the total resistance value of 141 on top electrode 131 and last workpiece sample; R2 is the total resistance value between top electrode 131 and following workpiece sample; R3 is two interelectrode total resistance values; R1 is an electrode resistance, and r2 is the contact resistance of 141 on top electrode 131 and last workpiece sample, and r3 is a workpiece resistance, and r4 is the contact resistance of 141,142 on two workpiece samples.
The concrete steps of the measurement of above-mentioned each total resistance value are to load constant current source S earlier between upper and lower two electrodes; Measure the voltage drop U1 of 141 on top electrode 131 and last workpiece sample then; Measure the voltage drop U2 of 142 on top electrode 131 and following workpiece sample then; Measure the voltage drop U3 of 131,1132 at two electrodes again; At last, because current constant, by the relation of resistance and voltage, can calculate the total resistance value R3 of 131,1132 at the total resistance value R2 of 142 on the total resistance value R1, top electrode 131 of 141 on top electrode 131 and last workpiece sample and following workpiece sample and two electrodes respectively.Certainly, can also adopt the micro-ohm resistance measuring instrument and the multichannel measurement probe is set and measure respectively, and directly measure above-mentioned each total resistance value R1, R2, R3.
According to above-mentioned each total resistance value that records, adopt following calculation equation to calculate:
Formula (1) is: R1=r1+r2+r3;
Formula (2) is: R2=r1+r2+2r3+r4;
Formula (3) is: R3=2r1+2r2+2r3+r4;
Through type (2)-Shi (1): r3+r4=R2-R1;
Through type (3)-2 * formula (1): r4=R3-2R1;
Therefore, the contact resistance r4 that can calculate 141,142 on two workpiece samples is R3-2R1.
Certainly, also can calculate workpiece sample resistance value, be r3=R1+R2-R3 by with among the r4=R3-2R1 substitution r3+r4=R2-R1; To can calculate top electrode 131 and top electrode 131 and the total resistance value that last workpiece sample 141 gets an electric shock and hinders indirectly by with r4=R3-2R2 and r3+r4=R2-R1 difference substitution formula (1), be (r1+r2)=R3-R2.
Below, by the environment-protection electroplating zine plate Materials Measurement of measuring method of the present invention to using always, be illustrated: under the condition of given 5mm diametral plane electrode, the thickness of the electrolytic galvanized sheet sample of choosing is 0.8mm, the zinc-plated amount in two sides respectively is 20g/m2, be 50 ℃ in temperature, when pressure is 120kg, the spot welding contact resistance r4 of this electrolytic galvanized sheet that records is 5.17m Ω; Be 50 ℃ in temperature, when pressure is 180kg, the contact resistance r4 that records is 4.76m Ω; Be 100 ℃ in temperature, when pressure is 240kg, the contact resistance r4 that records is 3.85m Ω; Be 200 ℃ in temperature, when pressure is 240kg, the contact resistance r4 that records is 1.38m Ω.Can analyze from measurement data and to draw, this electrolytic galvanized sheet is along with the increase of temperature and pressure, and the total trend of contact resistance diminishes.
Therefore, adopt this measuring method can measure the contact resistance of the thin plate spot welding under different temperatures, the different pressures condition, and do not have the introducing error, improved measuring accuracy, guaranteed the accuracy of measurement data, provide favourable foundation for accurately checking the light sheet products quality.
Those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in claims scope of the present invention variation, the modification of the above embodiment.
Claims (4)
1. the measuring method of a constriction resistance of sheet spot-welding is characterized in that,
The concrete steps of this measuring method are as follows:
A. two identical workpiece samples is stacked and be located between identical upper and lower two electrodes;
B. heat by the peripheral hardware temperature control box, and make the temperature inside the box reach assigned temperature;
C. upper and lower two electrodes and workpiece sample are forced into specified pressure, and keep stable;
D. distinguish all-in resistance and two interelectrode all-in resistances between potential electrode and workpiece sample;
E. each total resistance value by recording among the step D calculates the contact resistance between two workpiece samples.
2. the measuring method of constriction resistance of sheet spot-welding as claimed in claim 1 is characterized in that,
The measuring process of described each total resistance value of step D is as follows:
D1. between upper and lower two electrodes, load constant current source;
Voltage drop between the workpiece sample of D2. measuring an electrode and joining;
D3. the voltage drop between the electrode among the measuring process D2 and another workpiece sample;
D4. measure two interelectrode voltage drops;
D5. by the relation of resistance and voltage, calculate electrode respectively and total resistance value, this electrode and another workpiece sample between the workpiece sample of joining between total resistance value and two interelectrode total resistance values.
3. the measuring method of constriction resistance of sheet spot-welding as claimed in claim 1 is characterized in that:
Each total resistance value among the described step D directly records by adopting micro-ohm resistance measuring instrument and multichannel measurement probe.
4. the measuring method of constriction resistance of sheet spot-welding as claimed in claim 1 is characterized in that:
In the described step e, the calculation equation of the contact resistance value between two workpiece samples is as follows:
R1＝r1+r2+r3；
R2＝r1+r2+2r3+r4；
R3＝2r1+2r2+2r3+r4；
Calculate r4=R3-2R1 by above-mentioned three equations;
In the formula, R1 is the total resistance value between electrode and the workpiece sample that joins; R2 is the total resistance value between this electrode and another workpiece sample; R3 is two interelectrode total resistance values; R1 is an electrode resistance value; R2 is the contact resistance value between electrode and the workpiece sample that joins; R3 is a workpiece sample resistance value; R4 is the contact resistance value between two workpiece samples.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101833039A (en) * | 2010-04-30 | 2010-09-15 | 河海大学常州校区 | Pressure device of contact resistance measuring system |
| CN101885105A (en) * | 2010-05-28 | 2010-11-17 | 河海大学常州校区 | Pressure control electric device used for measuring contact resistance |
| CN102628823A (en) * | 2012-04-12 | 2012-08-08 | 哈尔滨工业大学 | Device for analyzing static contact characteristic of electrical appliance contact material |
| CN102628668A (en) * | 2011-02-04 | 2012-08-08 | 通用电气公司 | System and method for use in determining the thickness of a layer of interest in a multi-layer structure |
| CN102778608A (en) * | 2011-05-10 | 2012-11-14 | 通用汽车环球科技运作有限责任公司 | Method of measuring electrical resistance of joints |
| CN106824833A (en) * | 2017-02-28 | 2017-06-13 | 中国振华集团云科电子有限公司 | Resistor screening technology method |
| CN107607592A (en) * | 2017-10-10 | 2018-01-19 | 深圳军洋科技发展有限公司 | Soldering reliability method of testing and equipment |
| CN108181356A (en) * | 2018-01-11 | 2018-06-19 | 哈尔滨理工大学 | A kind of measuring method of welding battery quality |
-
2008
- 2008-03-14 CN CN200810034660A patent/CN101533046A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101833039A (en) * | 2010-04-30 | 2010-09-15 | 河海大学常州校区 | Pressure device of contact resistance measuring system |
| CN101833039B (en) * | 2010-04-30 | 2012-08-29 | 河海大学常州校区 | Pressure device of contact resistance measuring system |
| CN101885105A (en) * | 2010-05-28 | 2010-11-17 | 河海大学常州校区 | Pressure control electric device used for measuring contact resistance |
| CN102628668A (en) * | 2011-02-04 | 2012-08-08 | 通用电气公司 | System and method for use in determining the thickness of a layer of interest in a multi-layer structure |
| CN102778608A (en) * | 2011-05-10 | 2012-11-14 | 通用汽车环球科技运作有限责任公司 | Method of measuring electrical resistance of joints |
| CN102778608B (en) * | 2011-05-10 | 2014-11-26 | 通用汽车环球科技运作有限责任公司 | Method of measuring electrical resistance of joints |
| CN102628823A (en) * | 2012-04-12 | 2012-08-08 | 哈尔滨工业大学 | Device for analyzing static contact characteristic of electrical appliance contact material |
| CN106824833A (en) * | 2017-02-28 | 2017-06-13 | 中国振华集团云科电子有限公司 | Resistor screening technology method |
| CN107607592A (en) * | 2017-10-10 | 2018-01-19 | 深圳军洋科技发展有限公司 | Soldering reliability method of testing and equipment |
| CN108181356A (en) * | 2018-01-11 | 2018-06-19 | 哈尔滨理工大学 | A kind of measuring method of welding battery quality |
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Open date: 20090916 |