CN1030173C - Quantitative integrating control method of welding power source and its apparatus - Google Patents
Quantitative integrating control method of welding power source and its apparatus Download PDFInfo
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- CN1030173C CN1030173C CN 92108366 CN92108366A CN1030173C CN 1030173 C CN1030173 C CN 1030173C CN 92108366 CN92108366 CN 92108366 CN 92108366 A CN92108366 A CN 92108366A CN 1030173 C CN1030173 C CN 1030173C
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Abstract
The present invention relates to a quantitative integral control method of a welding power supply and a device thereof. The present invention is provided with a dedicated device which takes a microcomputer 1 as a core and comprises peripheral components, namely a welding current control and measurement component 2, an execution control component 3, a preset parameter input component 4, a keyboard 5, a digital display component 6 and an operating state display component 7; the microcomputer 1 which is solidified with a welding integral operation control program. The welding method of the present invention is characterized in that a welding parameter table which is beforehand fabricated and the dedicated device are used as main bodies to implement quantitative integral control of the welding power supply. The present invention obviously raises welding quality.
Description
The present invention relates to a kind of welding control method and special welding control device thereof.
The method of the control electric welding machine source of welding current roughly has following several at present:
(1) generally with manual or floor push control.This method error is excessive, can not be suitable for relatively more accurate welding control; (2) adopt the time relay to cooperate the mercury thyratron to carry out timing controlled.This method can not reach Millisecond control, grasps in the precision welding of Millisecond still not competent to welding time requirement; (3) ondomete numerical control method for making.This method is widely used in the occasion of the accurate welding requirements of Millisecond, by the accurate timing controller of Millisecond the electric welding machine source of welding current is carried out switch control.Yet, welding for low melting point element or small size element, owing to can't consider current variation in the welding process, so still be difficult to the competent various control that the welding acting is required extremely tight electric welding machine, influence welding quality, weld the conference defective work piece that did work, the welding acting is not enough, can make the workpiece failure welding.
The purpose of this invention is to provide a kind of and traditional diverse source of welding current quantitative integration of welding time control method control method, and the electric welding machine welding controller that is used for the inventive method.
In order to illustrate technical solution of the present invention, what let us was analyzed electric welding machine welding work pieces earlier has related parameter and their variations in welding process.
As everyone knows, during electric welding machine work, the size of its welding acting value W is to depend on weldering road resistance R, three factors of weld interval t and welding current I:
W＝f（I、R、t）
When R and I are constant, W=f(t), promptly only under the invariable condition of R and I, could reach what requirement of control welding acting value W with the length of control t weld interval.Yet experiment shows, this length by control weld interval determines that it is tight inadequately welding merit W.For same workpiece, in welding process, its starting stage, in rising trend, the interstage of electric current I, the electric current substantially constant, and final stage is then on a declining curve.This is because when beginning welding resistance, and especially contact resistance is bigger, and along with the partial melting of weldment, contact resistance becomes and be little, makes welding current become big rapidly.Afterwards, owing to weldment contact site major part melted by heat, contact resistance diminishes taxis calmly, and welding resistance mainly is the material self-resistance, therefore, and welding current substantially constant, slightly fluctuation.At last, because the weld part of weldment is fused into one fully, the weldment temperature raises rapidly, and thermal resistance strengthens, and welding current is reduced.As seen, same workpiece its welding current in welding process changes.
We investigate welding condition again to the influence of welding current.
(1) same welding work pieces is under different clamp pressures, and the welding current size is also different, in order to reach identical welding process requirement, must compensate.Less to pressure, clamping is the necessary proper extension of the welding work pieces weld interval of pine, and bigger to pressure, the welding work pieces that clamping is tighter then should suitably shorten weld interval.
Usually, under same workpiece, the identical conditions, required welding merit is
W＝W1+W2+W3+W4
Wherein W1 is the required under ideal conditions welding merit of workpiece.
W2 is the compensation merit of working environment ventilation and heat.
W3 is the compensation merit of workpiece welding heat radiation.
W4 is the compensation merit of electric welding machine characteristic.
Thereby, correspondingly required weld interval t=t1+t2+t3+t4
From the above as can be known, adopting the welding of theoretical work W1 timing controlled to be difficult to reach high quality welding simply requires, and should require and the definite actual best welding merit W of welding condition factors according to workpiece material, carry out real-time sampling with welding current to source of welding current output, its instantaneous power is carried out integration, compare with the best welding merit again, in case reach W '=c ∫
t 0RI
2(t) during dt=W, turn-off the welding execution unit by control assembly, cut off the source of welding current, finish once welding, c is the Joule heat constant in the expression formula.Therefore, technical scheme of the present invention is a quantitative integrating control method of welding power source, and designs source of welding current quantitative integration dedicated control device for the method.
Method special equipment of the present invention system is the center with the microcomputer, external welding current detection part, control execution unit and preset parameter input block, and keyboard, numeral show and the duty display unit.Wherein system's operation file is solidificated in the microcomputer rom chip.Parameter is by preset parameter input block or keyboard input microcomputer, and microcomputer sends sampling control signal to the welding current detection part, and writes the welding current data in real time.By the microcomputer computing, in case reaching, the welding merit presets acting during numerical value, microcomputer promptly sends to the control execution unit and turn-offs source of welding current signal, turn-offs being connected of electric welding machine and power supply by the control execution unit.
Source of welding current quantitative integration control method of the present invention is:
1. make the welding condition table.
2. the startup special equipment is imported and is preset number.
3. the startup welding procedure is connected the source of welding current by special equipment control, detects welding current in real time and the actual welding merit is carried out integral operation.
The integrated value of actual welding merit with preset best welding merit numerical value when consistent, the microcomputer in the special equipment sends and turn-offs source of welding current instruction, cuts off welding circuit by carrying out control assembly, once welding finishes to change over to the operation of " tempering " treatment process.
Advantage of the present invention is: 1. welding method of the present invention, and from welding process dynamically, the precision height guarantees welding quality, success rate height, good reliability; 2. special equipment of the present invention, structure are simple and clear, easy to implement; 3. to the plain edition mash welder, only need make simple refit as DN-15, DN-25 etc., just can be used for the occasion of accurate welding requirements.
Provide accompanying drawing of the present invention below.
Fig. 1 is the structural representation of special equipment of the present invention.
Fig. 2 is a program flow diagram of the present invention.
Below we will provide a better embodiment of the present invention, and, further provide ins and outs of the present invention by to the description of this embodiment.
Provide isolated plant of the present invention according to Fig. 1 and Fig. 2.Among Fig. 1, isolated plant of the present invention comprises microcomputer 1, welding current detection part 2, control execution unit 3 and preset parameter input block 4, keyboard 5, digital display unit 6 and duty display unit 7.In the present embodiment, microcomputer 1 adopts 8039 type single-chip microcomputers, is connected with digital display unit 6 by its delivery outlet P5, is connect mutually with duty display unit 7 by delivery outlet P4, be connected with keyboard 5 with the INT port by its T0, T1, connect with control execution unit 3 by delivery outlet P6.Welding current detection part 2 in the present embodiment comprises detection head 21, wave filter 22 and the A/D converter 23 that becomes circuit to connect successively, be connected with the secondary windings of electric welding machine by detection head 21, be connected with the input port P1 of microcomputer 1 by A/D converter 23, and send than the high 100 times sampling pulse of source of welding current cycle frequency to these parts 2 by the P2 mouth of microcomputer 1, its sampled voltage converts data signal to by A/D converter 23, writes microcomputer 1.Control execution unit 3 comprises isolator 31, amplification controller 32 and performance element 33, and they are connected with circuit successively, and is connected with the delivery outlet P6 of microcomputer 1 and is in series by the elementary winding of performance element 33 and electric welding machine by isolator 31.Preset parameter input block 4 comprises reference power source 41, divider 42 and A/D converter 43, and they connect with circuit successively, and is linked to each other with the input port P3 of microcomputer 1 by A/D converter 43, by P7 mouth output A/D sampled signal.
As an alternative, the microcomputer 1 of present embodiment also can adopt single board computer, for example Z80 type single board computer.Welding current detection part 2 also can adopt the integrated road of the special-purpose current detecting of 4000A to replace, and can make circuit structure more simple and reliable.
The control program of this isolated plant is solidificated in the rom chip of microcomputer 1 as shown in Figure 2.From scheming as seen, preset input functional module by entering the receiving process parameter value behind the starting up.Promptly enter welding process after the start detection module and calculate and the compensation adjustment program, the process of carrying out detects and carries out the integral operation quantitative identification, sends when satisfying the preset value condition and turn-offs the electric welding machine work order.Afterwards, carry out technology processor.At last, send the indication of power cut-off situation and " wait for once more and starting " signal, repeat to control the welding process.
When using special equipment of the present invention to weld, then necessary first basketry table, its practice is as follows: (1) is according to the material fusing point of processing work, welding processing face size and volume estimation go out roughly acting amount, should the acting amount be converted into process parameter value input computer, press orthogonal test method, determine that certain statistical cloth cover carries out processing experiment, therefrom select the qualified stable preferred process parameter value of welding quality.(2) change environment temperature successively: the welding work pieces ventilating heat dissipating environment, process conditions such as electric welding machine internal resistance characteristic are carried out soldering test, find out the compensating parameter value under the various process conditions.(3) according to above-mentioned two result of the tests, analyze by statistics, make corresponding process parameter value table and compensating parameter value table after the processing, they constitute the technology table altogether.
According to technology table parameter, in the microcomputer 1 in preferred process parameter value and the compensating parameter value input isolated plant, the start-up control program can be carried out the control of source of welding current quantitative integration automatically then.
Claims (6)
1, a kind of means of spot welds power supply quantitative integration control method is characterized in that: means of spot welds merit W '=c ∫
t 0RI
2(t) dt=W, c are the Joule heat constant, and r is weldering road resistance, and I is a welding current, and W is best means of spot welds merit.
A, according to W=W1+W2+W3+W4, make the welding condition table, wherein: W1 is a required welding merit under the ideal conditions, W2 is a working environment ventilation and heat compensation merit, W3 is a workpiece welding heat radiation compensation merit, W4 is an electric welding machine characteristic compensation merit,
B, startup spot welding power quantitative integration control isolated plant, and import best welding merit and preset several W,
C, start welding procedure, connect the source of welding current, detect welding current in real time and weld the integral operation of merit by isolated plant control,
D, weld merit in real time integrated value W ' when presetting best welding merit numerical value W and equate, turn-off the source of welding current and commentaries on classics " tempering " treatment process by isolated plant control.
2,, it is characterized in that the welding condition table comprises according to the described method of claim 1:
A, the roughly acting amount that goes out according to workpiece material fusing point, welding processing face size and volume estimation are selected the preferred process parameter value after determining to divide cloth cover by orthogonal test method.
B, change all compensating parameter values that influences welding quality of environment temperature and welding machine internal resistance successively,
C, analyze by statistics, make the welding condition table after the processing according to above-mentioned a, b item gained parameter value and compensating parameter value.
3, a kind of means of spot welds power supply quantitative integration control isolated plant according to claim 1 comprises microcomputer 1 and peripheral components thereof: the control execution unit (3), digital display unit (6) and the duty display unit (7) that become series connection with electric welding machine that are connected with the delivery outlet of this microcomputer (1) respectively; With the keyboard (5) that T0, the T1 of this microcomputer (1) are connected with the INT port, it is characterized in that connecting in addition having in the welding current detection part (2) of the electric welding machine and the real-time detection welding current of microcomputer (1), the preset parameter input block (4) that is connected with the input port and the sampled signal output of microcomputer (1) and the rom chip in the microcomputer (1) the means of spot welds merit W '=c ∫ of solidified welding process
t 0RI
2(t) quantitative integration of dt=W fortune control program.
4,, it is characterized in that preset parameter input block (4) comprises reference power source (41), divider (42) and the A/D converter (43) that connects with circuit successively according to the described device of claim 3.
5,, it is characterized in that welding current detection part (2) comprises detection head (21), wave filter (22) and the A/D converter (23) that connects with circuit in turn according to the described device of claim 3.
6,, it is characterized in that welding current detection part (2) is the 4000A type current detection IC piece of a connection electric welding machine and microcomputer (1) according to the described device of claim 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92108366 CN1030173C (en) | 1992-04-03 | 1992-04-03 | Quantitative integrating control method of welding power source and its apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92108366 CN1030173C (en) | 1992-04-03 | 1992-04-03 | Quantitative integrating control method of welding power source and its apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1076881A CN1076881A (en) | 1993-10-06 |
| CN1030173C true CN1030173C (en) | 1995-11-01 |
Family
ID=4943477
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92108366 Expired - Fee Related CN1030173C (en) | 1992-04-03 | 1992-04-03 | Quantitative integrating control method of welding power source and its apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1030173C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102601492B (en) * | 2012-03-02 | 2015-05-27 | 深圳麦格米特电气股份有限公司 | Arc-welding molten drop necking formation detection method and control method after necking formation |
-
1992
- 1992-04-03 CN CN 92108366 patent/CN1030173C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1076881A (en) | 1993-10-06 |
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