CN105364264B - The bath surface control method of resonant mode short circuiting transfer - Google Patents
The bath surface control method of resonant mode short circuiting transfer Download PDFInfo
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- CN105364264B CN105364264B CN201510805830.6A CN201510805830A CN105364264B CN 105364264 B CN105364264 B CN 105364264B CN 201510805830 A CN201510805830 A CN 201510805830A CN 105364264 B CN105364264 B CN 105364264B
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- short circuiting
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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
- B23K9/095—Monitoring or automatic control of welding parameters
-
- 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
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/173—Arc welding or cutting making use of shielding gas and of a consumable electrode
Abstract
The invention discloses the bath surface control method of a kind of resonant mode short circuiting transfer, in the case of electric current is more than 40A and is less than 300A, the current changing rate Di/Dt flowing through welding wire is: Di/Dt=K*(D+K1)2* Ia/(Va K2) (A/mS)；Wherein: K is constant, its span is 1.2 1.5；D is gage of wire；K1For correction value, its span is 0.4 0.7；What Ia was flows through the electric current of welding wire；Va is the voltage at welding wire two ends；K2For correction value, its span is 12 16.
Description
Technical field
The present invention relates to welding method field, specifically, relate to the bath surface control method of a kind of resonant mode short circuiting transfer.
Background technology
Short circuiting transfer is used primarily in metal arc welding.When short circuiting transfer refers to use smaller current and low-voltage welding, molten drop just directly contacts with molten bath before without departing from welding wire termination, electric arc instantaneous extinguishing short circuit, is transitioned in molten bath under the surface tension effects of electromagnetic contractile force, gravity and liquid metals that molten drop produces at short circuit current.Resonant mode short circuiting transfer is a kind of phenomenon.Work study shows, in welding process, has the weld seam of resonant mode short circuiting transfer, and the hem width of weld seam is uniform, and scalelike mark is fine and closely woven, and fusion penetration concordance is preferable, and the defect of weld seam is few, splashes low, has high welding quality, and its welding effect is as shown in Figure 1.But, in welding process, resonant mode short circuiting transfer phenomenon is not recurrent.So, research and develop a kind of method persistently keeping resonant mode short circuiting transfer phenomenon in welding process and be extremely necessary to improve welding quality.
Summary of the invention
The present invention is to solve that above-mentioned technical problem provides the bath surface control method of a kind of resonant mode short circuiting transfer, it is achieved the short circuiting transfer in the range of total current, improve welding quality.
Fig. 2 is resonant mode short circuiting transfer schematic diagram, and molten bath is positioned at the opposite direction of welding direction, under the common effect of arc force i.e. magneto-restrictive power and molten drop gravity, accelerates liquid state molten pool distally to movement, as shown in A figure in Fig. 2；Under surface tension effects, regularly reflux in molten bath, as shown in B figure in Fig. 2；And in height it is connected to the welding wire end sent constantly into and dissolve, now molten drop has been grown up, as shown in C figure in Fig. 2, current-rising-rate now to ensure within a rational time, ensure the temperature in molten bath, and the electric current in molten bath and welding wire separate type, the size of this electric current are provided, it is necessary to it is to produce necessary to rational magneto-restrictive power.
Resonant mode short circuiting transfer phenomenon is closely related with dry extension of electrode, arc voltage, electric current, wire feed rate etc., and in order to realize above-mentioned phenomenon, inventor the technical scheme is that
In the case of electric current is more than 40A and is less than 300A, the current changing rate Di/Dt flowing through welding wire is:
Di/Dt=K*(D+K1)2* Ia/(Va-K2) (A/mS)；
Wherein:
K is constant, and its span is 1.2-1.5；
D is gage of wire；
K1For correction value, its span is 0.4-0.7；
What Ia was flows through the electric current of welding wire；
Va is the welding wire end voltage to workpiece two ends；
K2For correction value, its span is 12-16.
As preferably, the value of described K is 1.33.
Further, the span of described K1 is 0.4-0.6.
Further, the span of described K2 is 13-15.
To sum up, the invention has the beneficial effects as follows: the method utilizing the present invention, it is possible to achieve in the resonant mode short circuiting transfer phenomenon of 40A to 300A, solve the FR problem of implementation of short circuiting transfer, improve welding quality.
Accompanying drawing explanation
Fig. 1 is the welding effect figure of existing solder technology.
Fig. 2 is resonant mode short circuiting transfer schematic diagram.
Fig. 3 be gage of wire be 0.8mm, when electric current Ia=100A, voltage Va=19V, voltage when not improving, current waveform figure；
Fig. 4 be gage of wire be 0.8mm, when electric current Ia=100A, voltage Va=19V, the voltage after improvement, current waveform figure.
Fig. 5 be gage of wire be 0.8mm, when electric current Ia=160A, voltage Va=21V, voltage when not improving, current waveform figure；
Fig. 6 be gage of wire be 0.8mm, when electric current Ia=160A, voltage Va=21V, the voltage after improvement, current waveform figure.
Fig. 7 be gage of wire be 0.8mm, when electric current Ia=180A, voltage Va=24V, voltage when not improving, current waveform figure；
Fig. 8 be gage of wire be 0.8mm, when electric current Ia=180A, voltage Va=24V, the voltage after improvement, current waveform figure.
Fig. 9 be gage of wire be 1.0 mm, when electric current Ia=110A, voltage Va=19V, voltage when not improving, current waveform figure；
Figure 10 be gage of wire be 1.0 mm, when electric current Ia=110A, voltage Va=19V, the voltage after improvement, current waveform figure.
Figure 11 be gage of wire be 1.0 mm, when electric current Ia=180A, voltage Va=20V, voltage when not improving, current waveform figure；
Figure 12 be gage of wire be 1.0 mm, when electric current Ia=180A, voltage Va=20V, the voltage after improvement, current waveform figure；
Figure 13 be gage of wire be 1.0 mm, when electric current Ia=210A, voltage Va=22V, voltage when not improving, current waveform figure；
Figure 14 be gage of wire be 1.0 mm, when electric current Ia=210A, voltage Va=22V, the voltage after improvement, current waveform figure.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art are obtained under not making creative work premise, broadly fall into the scope of protection of the invention.
The gas protecting welding wire of fusing is one after another drop of under gravity, magneto-restrictive power, surface tension effects flows to molten bath, and liquid state molten pool liquid level is the fluctuation of periodicity dipping and heaving.Its natural frequency of moving of bath surface is certain.Molten bath is the biggest, and its natural frequency is the lowest.The natural frequency utilizing droplet size, arcing pulsating current and molten bath " is in step with ", sets up molten bath molten drop and the resonator system of arcing pulsating current of total current scope, to reach low spatter, excellent welding penetration and weld appearance molding.
In welding process, wire feed rate can produce impact to system.Wire feed rate is the fastest, and the frequency beated in required molten bath is also the highest；Frequency is the highest, and the power of wire feed to increase accordingly；In welding, wire feed rate is proportional to size of current, therefore available Ia electric current characterizes wire feed rate.
Arc voltage is also the key factor affecting resonance.Arc voltage is the highest, and the length of electric arc is the longest, and the time required for liquid level rising is the longest, and the cycle is the longest, and now required Di/Dt is the least, and magneto-restrictive power is the least to the effect of page acceleration shock, is conducive to keeping the jumping frequency rate of liquid level.
Gage of wire is also the key factor affecting resonance.The amount of metal that unit interval is sent into welding region is closely related with gage of wire.Welding wire is the thickest, and needed for molten drop departs from welding wire end, magneto-restrictive power is the biggest, and required Di/Dt is the biggest.Welding wire sectional area square has substantial connection with diameter.
According to above-mentioned analysis, inventor finds in an experiment, at electric current more than 40A and less than in the case of 300A, so that the gamut that metal arc welding realizes short circuiting transfer covers, flows through the current changing rate Di/Dt of welding wire and meets following rule:
Di/Dt=K*(D+K1)2* Ia/(Va-K2) (A/mS)；
Wherein:
K is constant, and its span is 1.2-1.5；
D is gage of wire；
K1For correction value, its span is 0.4-0.7；
What Ia was flows through the electric current of welding wire；
Va is the welding wire end voltage to workpiece two ends；
K2For correction value, its span is 12-16.
In welding field, the very difficult derivation of equation of generation of phenomenon, above-mentioned formula is i.e. utilized to go the generation of derivation resonance to be a highly difficult thing.But, resonant mode short circuiting transfer can be reflected by voltage waveform, and it is the strongest.
In welding process, the stem elongation of welding wire is Φ 0.8=8/12, Φ 1.0=10/15, Φ 1.2=12/18.
Choose the welding wire of a diameter of 0.8mm:
When electric current Ia=100A, voltage Va=19V, under high-speed photography, when being provided without said method, the voltage of its welding wire, current waveform, as it is shown on figure 3, can be seen that from waveform its 1 exception of existence is short-circuit, affect welding effect.Use said method, it is preferred that K=1.33, K1=0.5, K2When=14, the voltage of its welding wire, current waveform as shown in Figure 4, can be seen that from waveform abnormal the most short-circuit disappear and frequency evenly, it is achieved resonant mode short circuiting transfer.
When electric current Ia=160A, voltage Va=21V, under high-speed photography, when being provided without said method, the voltage of its welding wire, current waveform, as it is shown in figure 5, can be seen that from waveform its 3 exceptions of existence are short-circuit, affect welding effect.Employing said method improves, and makes K=1.3, K1=0.55, K2=15, the voltage of its welding wire, current waveform as shown in Figure 6, can be seen that the most short-circuit disappearing from waveform, and bath surface enters resonant condition.
When electric current Ia=180A, voltage Va=24V, under high-speed photography, when being provided without said method, the voltage of its welding wire, current waveform, as it is shown in fig. 7, can be seen that from waveform its 9 exceptions of existence are short-circuit, affect welding effect.Employing said method improves, and makes K=1.33, K1=0.45, K2=14.5, the voltage of its welding wire, current waveform as shown in Figure 8, can be seen that the most short-circuit disappearing from waveform, periodically become strong, and bath surface enters resonant condition.
Choose the welding wire of a diameter of 1.0 mm:
When electric current Ia=110A, voltage Va=19V, under high-speed photography, when being provided without said method, the voltage of its welding wire, current waveform are as shown in Figure 9, although can be seen that there is no abnormal short-circuit generation from waveform, but it be the strongest so that welding effect being affected.Employing said method improves, and makes K=1.35, K1=0.55, K2=14, the voltage of its welding wire, current waveform as shown in Figure 10, can be seen that from waveform it periodically becomes strong, and bath surface enters resonant condition.
When electric current Ia=180A, voltage Va=20V, under high-speed photography, when being provided without said method, the voltage of its welding wire, current waveform as shown in figure 11, can be seen that from waveform it exists at 5 abnormal short-circuit, and welding effect is bad.Employing said method improves, and keeps K=1.33, K1=0.5, K2=13, the voltage of its welding wire, current waveform as shown in figure 12, can be seen that abnormal short-circuit disappearance from waveform, periodically become strong, and bath surface enters resonant condition.
When electric current Ia=210A, voltage Va=22V, under high-speed photography, when being provided without said method, the voltage of its welding wire, current waveform as shown in figure 13, can be seen that from waveform it exists at 10 abnormal short-circuit, affect welding effect.Employing said method improves, and keeps K=1.33, K1=0.5, K2=14, the voltage of its welding wire, current waveform as shown in figure 14, can be seen that abnormal short-circuit disappearance from waveform, periodically become strong, and bath surface enters resonant condition.
Claims (4)
1. the bath surface control method of resonant mode short circuiting transfer, it is characterised in that in the case of electric current is more than 40A and is less than 300A, the current changing rate Di/Dt flowing through welding wire is:
Di/Dt=K*(D+K1)2* Ia/(Va-K2) (A/mS)；
Wherein:
K is constant, and its span is 1.2-1.5；
D is gage of wire；
K1For correction value, its span is 0.4-0.7；
What Ia was flows through the electric current of welding wire；
Va is the welding wire end voltage to workpiece two ends；
K2For correction value, its span is 12-16.
The bath surface control method of resonant mode short circuiting transfer the most according to claim 1, it is characterised in that: the value of described K is 1.33.
The bath surface control method of resonant mode short circuiting transfer the most according to claim 1 and 2, it is characterised in that: described K1Span be 0.4-0.6.
The bath surface control method of resonant mode short circuiting transfer the most according to claim 1 and 2, it is characterised in that: described K2Span be 13-15.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1710037A1 (en) * | 2005-04-05 | 2006-10-11 | Vermaat Technics B.V. | Apparatus and method for short-circuit arc welding |
| CN101428368A (en) * | 2008-12-12 | 2009-05-13 | 北京工业大学 | Control method for short-circuiting transfer soldering system |
| CN103111732A (en) * | 2013-01-25 | 2013-05-22 | 昆山华恒焊接股份有限公司 | Control method of short circuiting transient process in consumable electrode gas shielded welding |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3327457B2 (en) * | 1997-09-26 | 2002-09-24 | トヨタ自動車株式会社 | Pulse arc welding method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1710037A1 (en) * | 2005-04-05 | 2006-10-11 | Vermaat Technics B.V. | Apparatus and method for short-circuit arc welding |
| CN101428368A (en) * | 2008-12-12 | 2009-05-13 | 北京工业大学 | Control method for short-circuiting transfer soldering system |
| CN103111732A (en) * | 2013-01-25 | 2013-05-22 | 昆山华恒焊接股份有限公司 | Control method of short circuiting transient process in consumable electrode gas shielded welding |
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