CN105798425A - System for controlling TIG welding residual stress through additional magnetic field device - Google Patents
System for controlling TIG welding residual stress through additional magnetic field device Download PDFInfo
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- CN105798425A CN105798425A CN201610180639.1A CN201610180639A CN105798425A CN 105798425 A CN105798425 A CN 105798425A CN 201610180639 A CN201610180639 A CN 201610180639A CN 105798425 A CN105798425 A CN 105798425A
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- magnetic field
- residual stress
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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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- 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
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
- Arc Welding Control (AREA)
Abstract
The invention relates to a system for controlling TIG welding residual stress and reducing the residual stress peak value through an additional magnetic field device. The system is characterized in that the additional magnetic field generation device generates a longitudinal magnetic field to act on a TIG welding arc, charged particles in the arc rotate to the edge of the arc under the effect of an additional magnetic field, and the arc is changed from the cone shape to the bell jar shape; arc energy and current density are distributed in a dual-peak shape, so that the welding temperature field gradient is reduced, the welding residual stress distribution is optimized, and the residual stress peak value of the seam position is reduced. Tests show that within a certain magnetic field intensity scope, the TIG welding residual stress distribution and the welding residual stress peak value are both obviously optimized; and as for different TIG welding process specifications, the additional magnetic field intensity has a corresponding optimum matching value.
Description
Technical field
The present invention relates to one utilizes externally-applied magnetic field to act on TIG weld, it is achieved distributed controll and the reduction welding residual stress peak value to welding residual stress, is specially a kind of externally-applied magnetic field device and controls the system of TIG weld residual stress.
Technical background
The existence of temperature field uneven in welding process and thermograde, to inevitably produce welding residual stress, and residual stress directly affects Welding Structure bearing capacity, stress corrosion resistant, fatigue strength, and the release of welding residual stress and the deformation that causes in following process process, finally affect dimensional stability and the precision of structure.
Based on this, this patent introduces external dc longitudinal magnetic field, with TIG weld electric arc for control object, the radius of turn of electric arc charged particle is regulated by changing magnetic field intensity, reach to control the distribution of electric current density and arc energy in electric arc, regulate the thermograde in temperature field in welding process, it is achieved the optimization of welding residual stress distribution, reduce residual stress peak value.
Offer one new way that controls of welding residual stress there is important realistic meaning.
Summary of the invention
It is an object of the invention to propose a kind of externally-applied magnetic field device and control the system of TIG weld residual stress, this system acts in TIG weld process by externally-applied magnetic field generating means, thus improving residual stress distribution and reducing weld residual stress peak value, the control for welding residual stress opens a kind of new controlling soil moist.
The present invention adopts the following technical scheme that, a kind of externally-applied magnetic field device controls the system of TIG weld residual stress, mainly includes externally-applied magnetic field device and TIG weld system；Externally-applied magnetic field device is made up of magnetic control regulated power supply, slide rheostat, magnet exciting coil；It is characterized in that: magnetic control regulated power supply, slide rheostat, magnet exciting coil are composed in series loop, magnet exciting coil is enclosed within welding gun and rigidly fixes with welding gun, and ensures coaxial with welding gun.
Magnetic control regulated power supply of the present invention have employed the regulated power supply of GCA-5A/6-36V, and its maximum output current is 5A, and the rate of change of output voltage is not more than ± 0.1%, and the DC voltage of output must be pulsed only small, to keep the stability in magnetic field.
Slide rheostat of the present invention is the size regulating exciting current by regulating its resistance value.
Magnet exciting coil of the present invention adopts axial symmetry hollow cylindrical, is mainly on a cylinder and is formed by the insulated copper wire coiling that diameter is 1.25mm, and coil turn is 1600 circles, and the interior diameter of coil is 50mm, and overall diameter is 90mm, is highly 150mm.Should be ensured that the wire one circle one circle closely company of suffering during coiling solenoid coil, wire turn, at radial and axial uniform winding, rounded co-axial return, is isolated by insulating paper between every layer line circle, burns out insulating barrier to prevent coil to be energized continuously.Consider radiations heat energy and the coil heating of electric arc in welding process, bottom magnet exciting coil, add asbestos layer to reach effect of heat insulation.
A kind of externally-applied magnetic field controls the system of TIG weld residual stress, and its characterization method is as follows:
(1) field generator for magnetic is utilized to produce longitudinal magnetic field；Regulating size of current specifically by slide rheostat and realize step-less adjustment, change the size of externally-applied magnetic field in a wider scope, magnetic control regulated power supply exports stable electric current and carrys out the longitudinal magnetic field that the generation of initiating excitation coil is stable；
(2) outside Longitudinal Magnetic-field Has acts on the charged particle in TIG weld electric arc, ordering about these charged particles to rotate to electric arc edge, promote welding arc to rotate, electric arc is expanded, arc shape is made to there occurs change, to be become bell shape, arc energy and electric current density by taper become bimodal shape to be distributed, it is to avoid energy concentration, thus causing that field of welding temperature changes, change welding residual stress distribution, reduce commissure residual stress peak value.
(3) regulate the radius of turn of electric arc charged particle by changing magnetic field intensity, reach to control electric current density and arc energy distribution in electric arc, regulate temperature field in welding process, it is achieved the optimization of welding residual stress distribution, reduce residual stress peak value.Test shows, in certain magnetic field strength range, TIG weld residual stress distribution and welding residual stress peak value are substantially optimized；For different TIG weld technological specifications, applied field strengths has a corresponding optimum matching point.
The present invention sets forth that outside Longitudinal Magnetic-field Has controls the mechanism of TIG weld residual stress from the following aspect:
(1) charged particle in TIG weld electric arc is done travel motion by negative electrode to anode, the Lorentz force that external dc longitudinal magnetic field and the charged particle with radial motion interact is ordered about charged particle and is rotated, thus promoting welding arc to rotate, band point particle focuses mostly at electric arc edge, center is reduced, electric arc is expanded, and arc shape is become bell shape by taper.Change the distribution of arc energy and electric current density, have adjusted the temperature field in welding process and thermograde.
(2) uneven in welding process temperature field and thermograde, will cause that workpiece produces welding residual stress.The change in temperature field and the attenuating of thermograde are beneficial to the optimization of welding residual stress and the reduction of residual stress peak value.
(3) under function composite by electromagnetic stirring so that in molten bath, liquid metal quickly flows, producing forced convection, compared with conventional convection current, this forced convection is very fierce, washes away cohesion crystal grain in molten bath, relaxes the residual stress in weld seam.
(4) radius of turn of electric arc charged particle is regulated by changing applied field strengths, reach to control electric current density and arc energy distribution in electric arc, regulate temperature field and reduction thermograde in welding process, it is achieved the adjustment of welding residual stress distribution, reduce the purpose of residual stress peak value.
The beneficial effect of present invention innovation: one, by inventing a kind of externally-applied magnetic field device, and be used for controlling in TIG weld by this device, effectively control the distribution of welding residual stress and reduce residual stress peak value, providing a new approach for controlling TIG weld residual stress distribution and reduction peak stress；Two, the mechanism that externally-applied magnetic field controls TIG weldering welding residual stress distribution and reduction residual stress peak value has had clear and definite elaboration.
Accompanying drawing explanation
Fig. 1 is the externally-applied magnetic field generating means schematic diagram of the present invention.
Fig. 2 is the structural design drawing of the magnet exciting coil of the present invention.
In figure, 1 magnetic control regulated power supply, 2 slide rheostats, 3 magnet exciting coils, 4 aluminium alloys,
5 pure iron, 6 enamel-covered wires-insulating paper, 7 asbestos.
Detailed description of the invention
Below in conjunction with accompanying drawing, as it is shown in figure 1, a kind of externally-applied magnetic field device controls the system of TIG weld residual stress, mainly include externally-applied magnetic field device and TIG weld system；Externally-applied magnetic field device is made up of magnetic control regulated power supply 1, slide rheostat 2, magnet exciting coil 3；It is characterized in that: magnetic control regulated power supply 1, slide rheostat 2, magnet exciting coil 3 are composed in series loop.Magnet exciting coil 3 is enclosed within welding gun and welding gun rigidly fixes, and ensures coaxial with welding gun.
As in figure 2 it is shown, magnet exciting coil design has aluminium alloy 4, pure iron 5, enamel-covered wire-insulating paper 6, asbestos 7；The design of magnet exciting coil of the present invention is the key of apparatus of the present invention, and the design of magnet exciting coil should be considered to meet the requirement that magnetic field controls, and is prone to again make, install, it is to avoid make troubles to welding process.The present invention has made a set of magnet exciting coil device for magnetic control welding by oneself, described magnet exciting coil adopts axial symmetry hollow cylindrical, it is mainly on a cylinder and is formed by the insulated copper wire coiling that diameter is 1.25mm, coil turn is 1600 circles, the interior diameter of coil is 50mm, overall diameter is 90mm, is highly 150mm.Should be ensured that the wire one circle one circle closely company of suffering during coiling solenoid coil, wire turn radially and axial uniform winding, rounded co-axial return, often after a complete circle, encase coil with insulating paper and play buffer action and burn out insulating barrier preventing coil to be energized continuously.Consider radiations heat energy and the coil heating of electric arc in welding process, bottom magnet exciting coil, add asbestos layer to reach effect of heat insulation.
The externally-applied magnetic field generating means of native system is by magnetic control regulated power supply 1, slide rheostat 2 and magnet exciting coil 3 are constituted, regulating size of current by slide rheostat 2 thus realizing step-less adjustment, magnetic control regulated power supply 1 exports stable electric current to be carried out initiating excitation coil 3 and produces stable longitudinal magnetic field.
Charged particle in TIG weld electric arc is done travel motion by negative electrode to anode, the Lorentz force that external dc longitudinal magnetic field and the charged particle with radial motion interact is ordered about charged particle and is rotated, thus promoting welding arc to rotate, band point particle focuses mostly at electric arc edge, center is reduced, electric arc is expanded, and arc shape is become bell shape by taper.Change the distribution of arc energy and electric current density, have adjusted the temperature field in welding process and thermograde, thus improving the distribution of welding residual stress and reducing commissure maximum residual stress.
Under function composite by electromagnetic stirring so that in molten bath, liquid metal quickly flows, producing forced convection, compared with conventional convection current, this forced convection is very fierce, washes away cohesion crystal grain in molten bath, relaxes the residual stress in weld seam.
The radius of turn of electric arc charged particle is regulated by changing applied field strengths, reach to control electric current density in electric arc, arc force and arc energy distribution, regulate temperature field and reduction thermograde in welding process, realize the adjustment of welding residual stress distribution, reduce the purpose of residual stress peak value.
Claims (4)
1. externally-applied magnetic field device controls a system for TIG weld residual stress, mainly includes externally-applied magnetic field device and TIG weld system；Externally-applied magnetic field device is made up of magnetic control regulated power supply, slide rheostat, magnet exciting coil；It is characterized in that: magnetic control regulated power supply, slide rheostat, magnet exciting coil are composed in series loop, magnet exciting coil is enclosed within welding gun and rigidly fixes with welding gun, and ensures coaxial with welding gun.
2. a kind of externally-applied magnetic field device according to claim 1 controls the system of TIG weld residual stress, it is characterized in that: described magnetic control regulated power supply have employed the regulated power supply of GCA-5A/6-36V, its maximum output current is 5A, the rate of change of output voltage is not more than ± 0.1%, the DC voltage of output must be pulsed only small, to keep the stability in magnetic field.
3. a kind of externally-applied magnetic field device according to claim 1 controls the system of TIG weld residual stress, it is characterised in that: described magnet exciting coil adopts axial symmetry hollow cylindrical, is mainly on a cylinder and is formed by the insulated copper wire coiling that diameter is 1.25mm；Coil turn is 1600 circles, and the interior diameter of coil is 50mm, and overall diameter is 90mm, is highly 150mm；Should be ensured that the wire one circle one circle closely company of suffering during coiling solenoid coil, wire turn is in radial and axial uniform winding, in coaxial circular loop, has insulating paper to package buffer action and burn out insulating barrier preventing coil to be energized continuously between each layer line circle；Consider radiations heat energy and the coil heating of electric arc in welding process, bottom magnet exciting coil, add asbestos layer to reach effect of heat insulation.
4. the system of an externally-applied magnetic field according to claim 1 control TIG weld residual stress, it is characterised in that:
(1) field generator for magnetic is utilized to produce longitudinal magnetic field；Regulating size of current specifically by slide rheostat and realize step-less adjustment, magnetic control regulated power supply exports stable electric current and carrys out the longitudinal magnetic field that the generation of initiating excitation coil is stable；
(2) outside Longitudinal Magnetic-field Has acts on the charged particle in TIG weld electric arc, and in TIG weld electric arc arc column, charged particle does travel motion from cathode directed anode；Additional longitudinal direct-current magnetic field and the charged particle with radial motion interact, produce Lorentz force, order about these charged particles to rotate to electric arc edge, and then promote welding arc to rotate, electric arc is expanded, arc shape is made to there occurs change, bell shape is become by taper, arc energy distribution and electric current density become bimodal shape to be distributed, avoiding energy to concentrate, thus causing that the thermograde of field of welding temperature reduces, optimizing welding residual stress distribution,, reduce commissure residual stress peak value；
(3) regulate the radius of turn of electric arc charged particle by changing magnetic field intensity, reach to control electric current density and arc energy distribution in electric arc, regulate temperature field in welding process, it is achieved the optimization of welding residual stress distribution, reduce residual stress peak value；Test shows, in certain magnetic field strength range, TIG weld residual stress distribution and welding residual stress peak value are substantially optimized；For different TIG weld technological specifications, applied field strengths has a corresponding optimum matching point.
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| CN201610180639.1A CN105798425A (en) | 2016-03-28 | 2016-03-28 | System for controlling TIG welding residual stress through additional magnetic field device |
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| CN201610180639.1A CN105798425A (en) | 2016-03-28 | 2016-03-28 | System for controlling TIG welding residual stress through additional magnetic field device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106289608A (en) * | 2016-08-02 | 2017-01-04 | 北京航空航天大学 | A kind of apparatus and method measuring welding arc axial force |
| CN107138831A (en) * | 2017-05-13 | 2017-09-08 | 上乘精密科技（苏州）有限公司 | A kind of argon arc welding board self-checking device control system |
| CN107220410A (en) * | 2017-05-03 | 2017-09-29 | 中车青岛四方机车车辆股份有限公司 | Parameter is on welding residual stress and deformation influence susceptibility acquisition methods |
| 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 |
| CN113042860A (en) * | 2021-03-15 | 2021-06-29 | 沈阳工业大学 | High-frequency longitudinal magnetic field generating device for magnetic control welding |
| CN114362530A (en) * | 2022-01-14 | 2022-04-15 | 华南理工大学 | Wide-range K-TIG multi-attitude welding magnetic control power supply system and control method |
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Cited By (11)
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| CN107220410B (en) * | 2017-05-03 | 2020-09-04 | 中车青岛四方机车车辆股份有限公司 | Method for acquiring influence sensitivity of parameters to welding residual stress and deformation |
| CN107138831A (en) * | 2017-05-13 | 2017-09-08 | 上乘精密科技（苏州）有限公司 | A kind of argon arc welding board self-checking device control system |
| CN107138831B (en) * | 2017-05-13 | 2019-06-11 | 上乘精密科技（苏州）有限公司 | A kind of argon arc welding board self-checking device control system |
| 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 |
| CN113042860A (en) * | 2021-03-15 | 2021-06-29 | 沈阳工业大学 | High-frequency longitudinal magnetic field generating device for magnetic control welding |
| CN114362530A (en) * | 2022-01-14 | 2022-04-15 | 华南理工大学 | Wide-range K-TIG multi-attitude welding magnetic control power supply system and control method |
| CN114362530B (en) * | 2022-01-14 | 2023-08-18 | 华南理工大学 | Wide-range K-TIG multi-pose welding magnetic control power supply system and control method |
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Application publication date: 20160727 |