CN109570693A - A kind of narrow gap magnetic control swing arc face of weld form self-adaptation control method - Google Patents
A kind of narrow gap magnetic control swing arc face of weld form self-adaptation control method Download PDFInfo
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- CN109570693A CN109570693A CN201910017836.5A CN201910017836A CN109570693A CN 109570693 A CN109570693 A CN 109570693A CN 201910017836 A CN201910017836 A CN 201910017836A CN 109570693 A CN109570693 A CN 109570693A
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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
- B23K9/02—Seam welding; Backing means; Inserts
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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
- B23K9/08—Arrangements or circuits for magnetic control of the arc
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Abstract
The present invention discloses a kind of self-adaptation control method of narrow gap magnetic control swing arc multi-pass welding face of weld form, it mainly carrys out automatic identification narrow gap weld seam surface characteristics with the variation of electric arc electric signal；System controls electric arc swing speed according to the variation of face of weld form to form smooth weld seam.Its key points of the technical solution are that: in the welding process, swing arc sensor controls electric arc and swings the scanning at groove, electric arc is perpendicular to welding direction, signal is acquired by sensor, by the arc voltage of dynamic monitoring electric arc, then by comparing the size of arc length, judge the variation of face of weld, it determines the surface state of weld seam at this, adjusts the speed of electric arc swing speed, realize the self adaptive control of face of weld flatness.Detection algorithm of the present invention is simple, fast response time, and detection accuracy is high, improves the welding stability of narrow gap swing arc weldering, avoids welding defect.
Description
Technical field
The invention belongs to welding technology field, specifically a kind of swing of narrow gap weld seam face of weld configuration of surface
The self-adapting detecting control method of arc welding.
Background technique
With the enlargement of modern industry and high parameter, the application of slab and ultra-thick plate welding metal structure is more and more wider
General, therefore, the application of narrow gap weld seam is also more and more extensive.During conventional narrow gap welding, often occur not melting such as side wall
The defects of conjunction, appearance of weld is bad.These defects can be produced some special industries (such as in the thick plates of aerospace field)
Raw huge harm.
In order to solve the problems, such as that side wall does not merge, multiclass sensor and technical solution are applied.Such as the patent No.
" a kind of the self-adapting detecting control system and method for narrow gap welding molten wide " of " 201610216940.3 " is to utilize to pass through ratio
Compared with the pulse number for calculating the right and left, determines center position deviation, by comparing the size of pulse sum, judge the width of molten wide
Narrow variation adjusts the size of torch oscillation amplitude, realizes the self adaptive control and welding gun automatic centering of molten wide.Beijing University of Technology
Hua Aibing et al. solve the problems, such as that sidewall fusion is bad during narrow gap welding by research transverse rotating magnetic field.On
It states research and solves only side wall incomplete fusion appeared in narrow gap welding process, appearance of weld is bad to ask there is no solving
Topic.
Due to the state of groove and the junction of per pass weld seam certainly will will appear it is uneven.And it is processed in Narrow sloping-glot
In the process, it can not accomplish the absolute smooth of groove, and when face of weld is uneven, can bring weld seam between layers to press from both sides
The defects of slag, uneven weld seam, certainly will influence whether the quality of weld seam.Therefore, weld seam face of weld flatness is self-adaptive controlled
It makes and is of great significance to the development for promoting narrow gap welding technology.
Zhang Zhongliang et al. achievees the purpose that control electric arc scanning speed using mobile welding torch.The method not can solve narrow
Side wall during gap weldig merges bad problem.And the present invention both can solve the face of weld of the appearance in welding process
The self adaptive control of form, and can solve the side wall occurred during narrow gap welding not fusion phenomenon.
Summary of the invention
It is an object of the invention to the groove for solving to occur in narrow gap multi-pass welding injustice and weld seam bumps occurs
Injustice leads to welding defect.In order to solve problem above, the present invention provides a kind of magnetic control narrow gap arc welding weld seam
The self-adapting detecting control system and method for configuration of surface.The technical solution adopted by the present invention to solve the technical problems is: first
First magnetic control arc sensor controls electric electric arc and swings to carry out weld groove scanning, acquires original signal by Hall sensor, right
Original signal carries out hardware filtering processing；Characterized by the following steps:
1. detecting the current signal I of pulsed arc by current sensor, and hardware filtering and arteries and veins are being carried out to the signal
After rushing the pretreatment such as shaping, input in computer；
2. computer extracts pulsed arc electric current number characteristic value signal, asks according to pulsed arc mutation value wayside signaling
Difference obtains weld seam concavo-convex deviation sensor signal value Δ FS=Fl-Fr；
3. according to the practical concave-convex situation of the positive negative judgement to concavo-convex deviation sensor signal value Δ FS, the weld seam as Δ FS > 0
Recess, the weld flush as Δ FS < 0, the smooth welded seam as Δ FS=0；According to the concavo-convex deviation sensor signal value pre-established
Linear approximate relationship between the size of Δ FS and practical concavo-convex deviation Δ X acquires practical concavo-convex deviation Δ after output conversion
The size of X.According to practical concavo-convex deviation Δ X, the frequency in magnetic field is adjusted.
Assuming that the quality of electric arc conductor is m, magnetic induction strong B, K are resistance coefficient, ρ is charge density, and V is movement velocity, S
For unit length arc column front face area it can thus be concluded that electric arc acceleration are as follows:
If the length of this defect is S, then the time required to electric arc scans defect are as follows:
Therefore, welding rod unit time cladding amount is H, then the cladding amount M of this defect defect are as follows:
Therefore, cladding amount when welding is positively correlated with magnetic induction intensity, so, according to pre-establishing practical alignment deviation
Relationship between Δ X and magnetic induction intensity adjusts magnetic induction intensity；When pit occurs in weld seam, reduce corresponding magnetic field strength Δ
B slows down scanning speed, and fusing metal cladding as much as possible is made to increase corresponding magnetic when protrusion occurs in weld seam to recess
Field intensity Δ B accelerates electric arc scanning speed, and fusing metal is made to lack cladding as far as possible to high spot.
Detailed description of the invention
Fig. 1 is the structure chart of the system principle of magnetic control arc welding, in Fig. 1: 1, molten bath 2, welding wire 3, electric arc 4, welding gun 5,
Magnetic induction coil 6, electric arc swing speed controller 7, wire-feed motor 8, the pulse power 9, Hall sensor.
Fig. 2 is the state of the electric arc when detecting recess.
Fig. 3 is the state of electric arc when detecting protrusion.
Fig. 4 is surface state detection system block diagram
Specific implementation step
Next combine example that specific implementation step of the invention is described in detail.
Example one: as shown in Fig. 2, electric arc is at the uniform velocity welding under the control in magnetic field by the magnetic field that magnetic induction coil generates
It carries out swinging in seam and forms molten bath, when electric arc scanning to pit, arc length is l at this time1, corresponding current signature is F1,
And at this time groove position apart from Weld pipe mill position be V0t(V0To scan initial velocity, t is sweep time), and when electric arc is in
When Weld pipe mill, arc length L0, therefore, when not having pit, arc length Lr herein is answered are as follows:
Corresponding electric signal is Fr at this time.
The arc length difference DELTA L generated at this time are as follows:
Electric signal difference is Δ FS=Fl-Fr at this time.
According to approximate between the size of the concavo-convex deviation sensor signal value Δ FS pre-established and practical concavo-convex deviation Δ X
Linear relationship acquires the size of practical concavo-convex deviation Δ X after output conversion.
Assuming that the quality of electric arc conductor is M, magnetic induction strong B, K are resistance coefficient, ρ is charge density, and V is movement velocity, S
For unit length arc column front face area it can thus be concluded that electric arc acceleration are as follows:
If the length of this defect is S, then the time required to electric arc scans defect are as follows:
Therefore, welding rod unit time cladding amount is H, then the cladding amount M of this defect defect are as follows:
Therefore, as Δ x < 0, groove position has been arrived in electric arc scanning, at this time under control of the computer, according to building in advance
Relationship between vertical practical alignment deviation Δ X and magnetic induction intensity, reduces corresponding magnetic field strength Δ B at this time, subtracts scanning speed
Slowly, make to melt metal cladding as much as possible to the magnetic field strength in recess computer adjustment electric arc wig-wag.Electric arc is swung
Alternating magnetic field frequency in controller reduces, and causes the scanning speed of electric arc to slow down, makes molten metal cladding into pit；
At this point, Δ FS=0, computer controls the alternating magnetic field frequency retrieval in electric arc wig-wag at this time when electric arc walks out pit, make to weld
It connects speed and restores normal.
Example two: as shown in figure 3, when electric arc scanning is to high spot as shown in the figure, arc length is l at this time1, corresponding electricity
Stream characteristic signal be F1, and at this time groove position apart from Weld pipe mill position be V0t(V0To scan initial velocity, when t is scanning
Between), and when electric arc is in Weld pipe mill, arc length L0, therefore, when not having pit, arc length Lr herein is answered are as follows:
Corresponding electric signal is Fr at this time.
The arc length difference DELTA L generated at this time are as follows:
Electric signal difference is Δ FS=Fl-Fr at this time.
According to approximate between the size of the concavo-convex deviation sensor signal value Δ FS pre-established and practical concavo-convex deviation Δ X
Linear relationship acquires the size of practical concavo-convex deviation Δ X after output conversion.
Assuming that the quality of electric arc conductor is M, magnetic induction strong B, K are resistance coefficient, ρ is charge density, and V is movement velocity, S
For unit length arc column front face area it can thus be concluded that electric arc acceleration are as follows:
If the length of this defect is S, then the time required to electric arc scans defect are as follows:
Therefore, welding rod unit time cladding amount is H, then the cladding amount M of this defect defect are as follows:
Therefore, as Δ x > 0, raised position has been arrived in electric arc scanning, at this time under control of the computer, according to pre-establishing
Relationship between practical alignment deviation Δ X and magnetic induction intensity increases corresponding magnetic field strength Δ B at this time, speeds scanning speed,
Make to melt metal cladding as few as possible to high spot, computer adjusts the magnetic field strength in electric arc wig-wag at this time, makes electric arc
Alternating magnetic field frequency in tilt control increases, and the scanning speed of electric arc is caused to increase, when high spot reduction deposited metals；When
Electric arc walks out pit, and Δ FS=0, computer controls the alternating magnetic field frequency retrieval in electric arc wig-wag at this time, makes speed of welding
Restore normal.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Within the technical scope of the present disclosure, any changes or substitutions that can be easily thought of by those familiar with the art, all answers
It is included within the scope of the present invention.Therefore, protection scope of the present invention should be with the protection scope of claims
It is quasi-.
Claims (3)
1. the adaptive approach that a kind of narrow gap swings electric electric arc multi-pass welding face of weld form, it is characterised in that: according to
Dynamic monitoring electric arc arc length compares with normal weld (i.e. face of weld is smooth) arc length, acquires concavo-convex deviation value according to algorithm,
Face of weld state is determined with this, and by adjusting electric arc swing speed, so as to improve weld seam state, feature includes following step
It is rapid:
1. detecting the current signal I of pulsed arc by current sensor, and whole to signal progress hardware filtering and pulse
After the pretreatment such as shape, input in computer；
2. computer is mutated spiking according to pulsed arc, pulsed arc current characteristic value signal is extracted, difference is asked to obtain weld seam
Concavo-convex deviation sensor signal value Δ FS=Fl-Fr；
3. as Δ FS > 0, weld seam is recessed according to the practical concave-convex situation of the positive negative judgement to concavo-convex deviation sensor signal value Δ FS
It falls into, the weld flush as Δ FS < 0, the smooth welded seam as Δ FS=0；According to the concavo-convex deviation sensor signal value pre-established
Linear approximate relationship between the size of Δ FS and practical concavo-convex deviation Δ X acquires practical concavo-convex deviation Δ after output conversion
The size of X.
2. realizing face of weld state-detection and self adaptive control to the dynamic contrast of arc voltage by computer, making face of weld
It is smooth.
3. a kind of control method of weld metal cladding amount, it is characterised in that: according to practical concavo-convex deviation Δ X, adjust magnetic field
Intensity B achievees the purpose that adjustment speed of welding, melts metal in the cladding amount of fault location to control with this；
Assuming that the quality of electric arc conductor is M, magnetic induction strong B, K are resistance coefficient, ρ is charge density, and V is movement velocity, and S is
The front face area of unit length arc column it can thus be concluded that electric arc acceleration are as follows:
If the length of this defect is S, then the time required to electric arc scans defect are as follows:
Therefore, welding rod unit time cladding amount is H, then the cladding amount M of this defect defect are as follows:
It can be seen that the linear correlation of cladding amount and magnetic induction intensity Cheng Zhengzheng when welding, so, according to pre-establishing reality
Relationship between alignment deviation Δ X and magnetic induction intensity adjusts magnetic induction intensity；When pit occurs in weld seam, reduce corresponding magnetic
Field intensity Δ B, slows down scanning speed, makes to melt metal cladding as much as possible to recess, when protrusion occurs in weld seam, increasing
Big corresponding magnetic field strength Δ B, accelerates electric arc scanning speed, and fusing metal is made to lack cladding as far as possible to high spot.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110238563A (en) * | 2019-04-22 | 2019-09-17 | 西南石油大学 | A kind of weld seam follower method based on electromagnetic sensor |
| CN110625226A (en) * | 2019-10-08 | 2019-12-31 | 华南理工大学 | K-TIG deep fusion welding control system and method under action of composite magnetic field |
| CN113042868A (en) * | 2021-04-06 | 2021-06-29 | 湘潭大学 | Self-adaptive control method for width of additive manufacturing layer of magnetic control plasma arc fuse |
| CN114101869A (en) * | 2021-10-21 | 2022-03-01 | 湘潭大学 | Welding seam forming regulation and control method based on arc swing coupling welding parameter follow-up of space circular arc track |
| CN115781094A (en) * | 2022-11-29 | 2023-03-14 | 天津工业大学 | Welding seam deviation detection method and device |
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| JP2002224829A (en) * | 2001-02-05 | 2002-08-13 | Hitachi Ltd | Method and equipment for welding narrow groove with peak pulse tig |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110238563A (en) * | 2019-04-22 | 2019-09-17 | 西南石油大学 | A kind of weld seam follower method based on electromagnetic sensor |
| CN110625226A (en) * | 2019-10-08 | 2019-12-31 | 华南理工大学 | K-TIG deep fusion welding control system and method under action of composite magnetic field |
| CN110625226B (en) * | 2019-10-08 | 2021-05-18 | 华南理工大学 | K-TIG deep fusion welding control system and method under action of composite magnetic field |
| CN113042868A (en) * | 2021-04-06 | 2021-06-29 | 湘潭大学 | Self-adaptive control method for width of additive manufacturing layer of magnetic control plasma arc fuse |
| CN113042868B (en) * | 2021-04-06 | 2022-06-28 | 湘潭大学 | Self-adaptive control method for width of additive manufacturing layer of magnetic control plasma arc fuse |
| CN114101869A (en) * | 2021-10-21 | 2022-03-01 | 湘潭大学 | Welding seam forming regulation and control method based on arc swing coupling welding parameter follow-up of space circular arc track |
| CN115781094A (en) * | 2022-11-29 | 2023-03-14 | 天津工业大学 | Welding seam deviation detection method and device |
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Application publication date: 20190405 |