CN108941859B - Alternating-current submerged arc welding output current compensation method based on recursion algorithm - Google Patents
Alternating-current submerged arc welding output current compensation method based on recursion algorithm Download PDFInfo
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- CN108941859B CN108941859B CN201810835266.6A CN201810835266A CN108941859B CN 108941859 B CN108941859 B CN 108941859B CN 201810835266 A CN201810835266 A CN 201810835266A CN 108941859 B CN108941859 B CN 108941859B
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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
- B23K9/00—Arc welding or cutting
- B23K9/18—Submerged-arc welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
- B23K9/00—Arc welding or cutting
- B23K9/09—Arrangements or circuits for arc welding with pulsed current or voltage
- B23K9/091—Arrangements or circuits for arc welding with pulsed current or voltage characterised by the circuits
- B23K9/092—Arrangements or circuits for arc welding with pulsed current or voltage characterised by the circuits characterised by the shape of the pulses produced
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Abstract
The invention discloses an alternating current submerged arc welding output current compensation method based on a recursion algorithm, which comprises the following steps of: A. constructing a compensation recursion algorithm in an embedded system for controlling the current output of the submerged arc welding machine; B. starting a compensation recursion algorithm, and constructing a direct current output single-period half-wave model and an alternating current output single-period half-wave model in the system; C. calculating the area of the direct current output single-period half-wave model, and calculating to obtain an alternating current output current peak value under the condition of a real-time alternating current rising or falling slope by taking the area of the direct current output single-period half-wave model as a reference, so that the area of the alternating current output single-period half-wave model is equal to the area of the direct current output single-period half-wave model; D. and constructing a continuous alternating current output wave on the basis of the alternating current output single-period half-wave model, and outputting alternating current according to the continuous alternating current output wave. When the method is applied, the problem of inconsistent absolute average value of output alternating current caused by the adjustment of the rising slope or the falling slope of the alternating current can be effectively solved.
Description
Technical Field
The invention relates to the technical field of digital power supplies, in particular to an alternating current submerged arc welding output current compensation method based on a recursion algorithm.
Background
Submerged arc welding is used as a traditional welding mode, the existing alternating current submerged arc welding still takes silicon controlled rectifier as a main part, and the control adopts analog control, so that the requirements of time development are not met. The novel digital control realizes multifunctional control and has multiple parameters with wide range and adjustability. The welding penetration required by customers is realized by adjusting the welding frequency, controlling the waveform balance and the direct current offset parameters and adjusting the rising or falling slope of the current, and the forming of the welding surface is controlled, which has become a necessary trend. The AC submerged arc welding power supply is mostly used for double-wire welding or multi-wire welding, and the welding process comparison of different parameters can be realized only under the condition of the same average absolute current, so that the output welding absolute average current is kept consistent when the parameters of AC frequency, waveform balance, DC offset and rising or falling slope are adjusted, and how to ensure the consistency of the absolute average value of the output current becomes the problem to be solved.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the alternating current submerged arc welding output current compensation method based on the recursion algorithm, and when the method is applied, the problem that the absolute average value of the output alternating current is inconsistent due to the adjustment of the rising slope or the falling slope of the alternating current can be effectively solved.
The invention is realized by the following technical scheme:
the alternating current submerged arc welding output current compensation method based on the recurrence algorithm comprises the following steps:
A. constructing a compensation recursion algorithm in an embedded system for controlling the current output of the submerged arc welding machine;
B. starting a compensation recursion algorithm, constructing a direct current output single-period half-wave model and an alternating current output single-period half-wave model in a system, wherein the direct current output single-period half-wave model is rectangular, the width of the direct current output single-period half-wave model is a direct current output current value, the length of the direct current output single-period half-wave model is a single-period half-wave direct current maintenance time, the length of the alternating current output single-period half-wave model is an isosceles trapezoid, the length of the lower bottom of the isosceles trapezoid is the single-period half-wave alternating current maintenance time, the tangent value of the base angle of the isosceles trapezoid is an alternating current rising or falling slope, the height of the isosceles;
C. calculating the area of the direct current output single-period half-wave model according to a compensation recursion algorithm, and calculating to obtain an alternating current output current peak value under the condition of real-time alternating current rising or falling slope by taking the area of the direct current output single-period half-wave model as a reference so that the area of the alternating current output single-period half-wave model is equal to the area of the direct current output single-period half-wave model;
D. the system constructs continuous alternating current output waves on the basis of the alternating current output single-period half-wave model with the determined alternating current output current peak value, and controls the submerged arc welding machine to output alternating current according to the continuous alternating current output waves.
Preferably, the application flow of the compensation recursion algorithm comprises:
the first step is as follows: initializing a recursion moment, wherein X is H, and t is 1;
the second step is that: calculating S1 according to the current acquisition given value L, H, tanA, and constructing S2 (X);
the third step: comparing the difference value deltaS obtained by substituting the current value of the variable X into S1 and S2 (X);
the fourth step: if Δ S is greater than zero, the value of X is added to t and the third step is repeated;
the fifth step: if the delta S is equal to zero, obtaining a required X value, and ending the algorithm;
the meaning of each symbol above:
l is the length of the rectangle and the length of the bottom of the isosceles trapezoid, H is the width of the rectangle, A is the base angle of the isosceles trapezoid, tanA is the rising or falling slope of the alternating current, t is the step length of the current compensation, X is the height of the isosceles trapezoid, S1 is the area of the rectangle, and S2(X) is a function of the area of the isosceles trapezoid with respect to the height X.
Preferably, the compensation recursion algorithm is specifically as follows:
S1＝L*H；
S2(X)＝(L+M)*X/2；
tanA＝X/[(L-M)/2]；
where M is the length of the upper base of the isosceles trapezoid, L, M, A and t are known, the initial value of X is H, and the value of X is found by increasing X with t as the offset such that the value of S2(X) approaches S1 step by step until it equals S1.
Preferably, the value range of the rising or falling slope tanA of the alternating current must satisfy that when the ac output current peak value maintaining time M is equal to zero, the required value X is obtained, and the algorithm is ended.
Preferably, the submerged arc welding machine is an automatic submerged arc welding machine.
The invention has the following advantages and beneficial effects:
1. the alternating current submerged arc welding output current compensation method based on the recursion algorithm can effectively solve the problem that the absolute average value of output alternating current is inconsistent due to adjustment of the rising slope or the falling slope of alternating current.
2. The alternating-current submerged-arc welding output current compensation method based on the recursion algorithm is convenient for comparing the welding penetration and the welding seam formation under different alternating-current parameters during alternating-current submerged-arc welding.
3. The alternating-current submerged arc welding output current compensation method based on the recursion algorithm is convenient for adjusting welding process parameters by using a single-variable method.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a flowchart of a compensation recursion algorithm of the present invention;
FIG. 2 is a schematic diagram of a DC output monocycle half-wave model and an AC output monocycle half-wave model according to the present invention;
FIG. 3 is a timing diagram of an embodiment of the present invention.
The symbols and labels and names in the drawings:
the length of the L-rectangle and the length of the base of the isosceles trapezoid, the width of the H-rectangle, the base angle of the A-isosceles trapezoid, the tanA-alternating current rising or falling slope, the t-current compensation step, the height of the X-isosceles trapezoid, the area of the S1-rectangle, the area of the S2(X) -isosceles trapezoid as a function of height X, the length of the upper base of the M-isosceles trapezoid.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Examples
As shown in fig. 1 and 2, the output current compensation method for ac submerged arc welding based on recursion algorithm includes the following steps:
A. constructing a compensation recursion algorithm in an embedded system for controlling the current output of the submerged arc welding machine;
B. starting a compensation recursion algorithm, constructing a direct current output single-period half-wave model and an alternating current output single-period half-wave model in a system, wherein the direct current output single-period half-wave model is rectangular, the height of the direct current output single-period half-wave model is a direct current output current value, the length of the direct current output single-period half-wave model is a single-period half-wave direct current maintenance time, the length of the alternating current output single-period half-wave model is an isosceles trapezoid, the length of the lower bottom of the isosceles trapezoid is the single-period half-wave alternating current maintenance time, the tangent value of the base angle of the isosceles trapezoid is an alternating current rising or falling slope, the height of the isosceles;
C. calculating the area of the direct current output single-period half-wave model according to a compensation recursion algorithm, and calculating to obtain an alternating current output current peak value under the condition of real-time alternating current rising or falling slope by taking the area of the direct current output single-period half-wave model as a reference so that the area of the alternating current output single-period half-wave model is equal to the area of the direct current output single-period half-wave model;
D. the system constructs continuous alternating current output waves on the basis of the alternating current output single-period half-wave model with the determined alternating current output current peak value, and controls the submerged arc welding machine to output alternating current according to the continuous alternating current output waves.
The application flow of the compensation recursion algorithm comprises the following steps:
the first step is as follows: initializing a recursion moment, wherein X is H, and t is 1;
the second step is that: calculating S1 according to the current acquisition given value L, H, tanA, and constructing S2 (X);
the third step: comparing the difference value deltaS obtained by substituting the current value of the variable X into S1 and S2 (X);
the fourth step: if Δ S is greater than zero, the value of X is added to t and the third step is repeated;
the fifth step: if the delta S is equal to zero, obtaining a required X value, and ending the algorithm;
the meaning of each symbol above:
l is the length of the rectangle and the length of the bottom of the isosceles trapezoid, H is the width of the rectangle, A is the base angle of the isosceles trapezoid, tanA is the rising or falling slope of the alternating current, t is the step length of the current compensation, X is the height of the isosceles trapezoid, S1 is the area of the rectangle, and S2(X) is a function of the area of the isosceles trapezoid with respect to the height X.
The compensation recursion algorithm is specifically as follows:
S1＝L*H；
S2(X)＝(L+M)*X/2；
tanA＝X/[(L-M)/2]；
where M is the length of the upper base of the isosceles trapezoid, L, M, A and t are known, the initial value of X is H, and the value of X is found by increasing X with t as the offset such that the value of S2(X) approaches S1 step by step until it equals S1.
The value range of the rising or falling slope tanA of the alternating current must satisfy that when the peak value maintaining time M of the alternating current output current is equal to zero, the required value X is obtained, and the algorithm is ended.
As shown in figure 3, under the conditions that the alternating current frequency is 20Hz to 100Hz, the waveform is balanced by 25 percent to 75 percent, and the direct current offset is 25 percent to 75 percent, the rising or falling slope of the alternating current is adjusted, the absolute average values of the alternating current output by the submerged arc welding machine are consistent, the welding penetration and the welding seam forming under different alternating current parameters are conveniently compared, and the adjustment of the welding process is facilitated.
According to the steps, different L, M, A and t values are taken, and the absolute value of the average value of the monocycle half-wave current of the alternating current waveform after waveform balance and direct current offset is equal to the monocycle half-wave direct current value under the same given current (the error is not more than +/-t).
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (5)
1. The alternating current submerged arc welding output current compensation method based on the recursion algorithm is characterized by comprising the following steps of:
A. constructing a compensation recursion algorithm in an embedded system for controlling the current output of the submerged arc welding machine;
B. starting a compensation recursion algorithm, constructing a direct current output single-period half-wave model and an alternating current output single-period half-wave model in the system, wherein the direct current output single-period half-wave model is rectangular, the width of the direct current output single-period half-wave model is a direct current output current value, the length of the direct current output single-period half-wave model is a single-period half-wave direct current maintenance time, the alternating current output single-period half-wave model is an isosceles trapezoid, the length of the lower bottom of the isosceles trapezoid is a,
the tangent value of the bottom angle of the isosceles trapezoid is the rising or falling slope of the alternating current, the height of the isosceles trapezoid is the peak value of the alternating current output current, and the length of the upper bottom of the isosceles trapezoid is the peak value maintaining time of the alternating current output current;
C. calculating the area of the direct current output single-period half-wave model according to a compensation recursion algorithm, and calculating to obtain an alternating current output current peak value under the condition of real-time alternating current rising or falling slope by taking the area of the direct current output single-period half-wave model as a reference so that the area of the alternating current output single-period half-wave model is equal to the area of the direct current output single-period half-wave model;
D. the system constructs continuous alternating current output waves on the basis of the alternating current output single-period half-wave model with the determined alternating current output current peak value, and controls the submerged arc welding machine to output alternating current according to the continuous alternating current output waves.
2. The AC submerged arc welding output current compensation method based on the recursion algorithm is characterized in that,
the application flow of the compensation recursion algorithm comprises the following steps:
the first step is as follows: initializing a recursion moment, wherein X = H and t = 1;
the second step is that: calculating S1 according to the current acquisition given value L, H, tanA, and constructing S2 (X);
the third step: comparing the difference value deltaS obtained by substituting the current value of the variable X into S1 and S2 (X);
the fourth step: if Δ S is greater than zero, the value of X is added to t and the third step is repeated;
the fifth step: if the delta S is equal to zero, obtaining a required X value, and ending the algorithm;
the meaning of each symbol above:
l is the length of the rectangle and the length of the bottom of the isosceles trapezoid, H is the width of the rectangle, A is the base angle of the isosceles trapezoid, tanA is the rising or falling slope of the alternating current, t is the step length of the current compensation, X is the height of the isosceles trapezoid, S1 is the area of the rectangle, and S2(X) is a function of the area of the isosceles trapezoid with respect to the height X.
3. The alternating current submerged arc welding output current compensation method based on the recursion algorithm is characterized in that the compensation recursion algorithm is specifically as follows:
S1=L*H；
S2（X）=（L+M）*X/2；
tanA=X/[(L-M)/2]；
where M is the length of the upper base of the isosceles trapezoid, L, M, A and t are known, the initial value of X is H, and the value of X is found by increasing X with t as the offset such that the value of S2(X) approaches S1 step by step until it equals S1.
4. The AC submerged arc welding output current compensation method based on the recursion algorithm as claimed in claim 2, wherein,
the value range of the rising or falling slope tanA of the alternating current must satisfy that when the peak value maintaining time M of the alternating current output current is equal to zero, the required value X is obtained, and the algorithm is ended.
5. The AC submerged arc welding output current compensation method based on the recursion algorithm is characterized in that,
the submerged arc welding machine is an automatic submerged arc welding machine.
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| CN101564784A (en) * | 2008-04-24 | 2009-10-28 | 株式会社大亨 | Pulse electric arc welding output and control method |
| CN101295921A (en) * | 2008-06-05 | 2008-10-29 | 上海交通大学 | Current peak controlling double-trapezoidal wave compensation method of three-power level DC boosting converter |
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