CN109773310A - The method of induced with laser Variable Polarity Square-wave AC Gas Tungsten Arc Welding small-bore thin-wall tube - Google Patents
The method of induced with laser Variable Polarity Square-wave AC Gas Tungsten Arc Welding small-bore thin-wall tube Download PDFInfo
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- CN109773310A CN109773310A CN201910186582.XA CN201910186582A CN109773310A CN 109773310 A CN109773310 A CN 109773310A CN 201910186582 A CN201910186582 A CN 201910186582A CN 109773310 A CN109773310 A CN 109773310A
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Abstract
The invention belongs to metal welding techniques fields, more particularly to a kind of method of induced with laser Variable Polarity Square-wave AC Gas Tungsten Arc Welding small-bore thin-wall tube, include the following steps: that (1) fixes radiating laser beams rifle and Variable Polarity Square-wave AC tungsten argon arc welding gun, wherein radiating laser beams rifle is preceding, Variable Polarity Square-wave AC tungsten argon arc welding gun is rear, need the part docked that docking is formed thin-wall tube to be welded, wherein, Variable Polarity Square-wave AC tungsten argon arc welding gun should be directed at the centre of workpiece welding portion to be welded in the surface at position to be welded, the focus of laser beam；(2) progressive forming and mobile thin-wall tube to be welded, first emit laser beam, then the Variable Polarity Square-wave AC tungsten argon arc welding gun that ignites, and arc spot carries out cathode cleaning and incipient melting to the welding position of thin-wall tube to be welded, and welding position surface is made to be in high temperature fused state；(3) welding position persistently then is irradiated using laser beam, the electric arc of successive induction Variable Polarity Square-wave AC tungsten argon arc melting welding is completed thin-wall tube and persistently welded.
Description
Technical field
The invention belongs to metal welding techniques fields, and in particular to a kind of induced with laser Variable Polarity Square-wave AC Gas Tungsten Arc Welding
The method of small-bore thin-wall tube.
Background technique
Stainless-steel thin-wall pipe is not easy to get rusty, extensive in industrial applications such as electronics, chemical industry, food, medicine；Aluminium alloy has close
Spend small, plasticity is good, it is easily processed into type, without black brittleness transformation and the advantages that atmospheric corrosion resistance, be widely used in aviation, boat
It, the structural material of high-speed train or other delivery vehicles, however, since stainless steel is easy by before environmental pollution, welding
Cleaning requires high；Aluminum alloy material surface has one layer of dense oxidation film, has distinctive physics and chemical characteristic, determines stainless
The unique weldability of the non-ferrous metals such as steel and aluminium alloy.
The pollutant of stainless steel surface and the dense oxidation film of aluminum alloy surface require TIG weld that should play cathode cleaning
Effect removal surface contaminants and fine and close oxidation film, reduce tungsten electrode scaling loss again, keep tungsten electrode tip shapes.Especially automatic
In welding, the TIG weld system that height clears up low tungsten electrode scaling loss becomes the expectation of people.Along this thinking, aluminum alloy TIG welding
Method experienced that direct current tungsten electrode meets (DCEN), direct current tungsten electrode meets positive (DCEP), sine wave AC, square wave alternating-current develop to Variable Polarity
Square wave TIG weld.
The laser that Chinese patent literature CN108465938A discloses a kind of preposition electric arc liquefaction heating element surface layer is compound
Welding method, this method fix Variable Polarity Square-wave AC tungsten electrode rifle and radiating laser beams rifle, wherein Variable Polarity Square-wave AC tungsten argon arc rifle
Preceding, radiating laser beams rifle first opens Variable Polarity Square-wave AC tungsten argon arc rifle and treats Welder in rear, continuous moving welded workpiece
The welding position of part carries out cathode cleaning and incipient melting, so that welding portion surface is in high temperature fused state, then makes laser
Beam is irradiated to the welding portion, to deepen the fusion penetration of Variable Polarity Square-wave AC tungsten argon arc melting welding, completes welding.Although this method
Fusion penetration can be increased, improve welding quality and welding efficiency, but the sundries meeting such as the pollutant on welded workpiece surface and oxidation film
Arc spot is interfered, free so as to cause Variable Polarity Square-wave AC Gas Tungsten Arc Welding electric arc, welding precision is poor.
Summary of the invention
To solve the above-mentioned problems, the invention discloses a kind of induced with laser Variable Polarity Square-wave AC Gas Tungsten Arc Welding small-bores
Radiating laser beams rifle is arranged in front of Variable Polarity Square-wave AC tungsten argon arc welding gun, first opens in welding process by the method for thin-wall tube
Radiating laser beams rifle is then turned on Variable Polarity Square-wave AC tungsten argon arc welding gun, accurately guides welding arc to portion to be welded using laser beam
Position makes Variable Polarity Square-wave AC tungsten electrode argon-arc welding electric arc be no longer influenced by the sundries such as pollutant or the oxidation film of welding workpiece surface region dry
It disturbs and dissociates, precision heating small-bore thin-wall tube position to be welded and the molten condition that reaches a high temperature, so that it is thin to complete small-bore
The precision welding of wall pipe.
To achieve the goals above, the present invention adopts the following technical scheme:
A kind of method of induced with laser Variable Polarity Square-wave AC Gas Tungsten Arc Welding small-bore thin-wall tube, includes the following steps:
(1) radiating laser beams rifle and Variable Polarity Square-wave AC tungsten argon arc welding gun are fixed, wherein radiating laser beams rifle is in preceding, Variable Polarity
Square wave tungsten argon arc welding gun needs the part docked that docking is formed rear, by thin-wall tube to be welded, wherein Variable Polarity Square-wave AC
Tungsten argon arc welding gun should be directed at the centre of workpiece welding portion to be welded in the surface at position to be welded, the focus of laser beam；
(2) progressive forming and mobile thin-wall tube to be welded, first emit laser beam, then the Variable Polarity Square-wave AC tungsten argon arc welding gun that ignites,
Electric arc is induced to precisely align position to be welded by laser beam, it is clear that arc spot carries out cathode to the welding position of thin-wall tube to be welded
It manages and incipient melting, welding position surface is made to be in high temperature fused state；
(3) welding position, the electricity of successive induction Variable Polarity Square-wave AC tungsten argon arc melting welding persistently then are irradiated using laser beam
Arc is completed thin-wall tube and is persistently welded.
Preferably, the tungsten electrode of above-mentioned Variable Polarity Square-wave AC tungsten argon arc is negative can independently adjust with the tungsten electrode half-wave current that is positive
Section, adjustable range are 5~300A.
Preferably, the defocusing amount of above-mentioned laser beam is -1 to 0mm.
Preferably, the spacing between above-mentioned laser beam center and the tungsten electrode center of Variable Polarity Square-wave AC argon tungsten-arc welding is
0.3 to 1.0mm.
Preferably, above-mentioned radiating laser beams rifle and Variable Polarity Square-wave AC tungsten argon arc welding gun are fixed on a screw rod, lead to
The distance between laser beam center and Variable Polarity Square-wave AC tungsten electrode center are overregulated to be welded.
Preferably, the welding portion of above-mentioned thin-wall tube to be welded has 0.1mm or smaller docking space.
Preferably, the direction of illumination in electric arc direction and laser beam that above-mentioned Variable Polarity Square-wave AC tungsten electrode is emitted is at one
Clamp angle is parallel to each other, and Variable Polarity Square-wave AC tungsten electrode acts perpendicularly to the welding position of thin-wall tube to be welded.
Preferably, the material of above-mentioned thin-wall tube to be welded be stainless steel, aluminium alloy, magnesium alloy, copper alloy, titanium alloy and
One or both of low-alloy steel.
Preferably, the section of above-mentioned thin-wall pipe welding part to be welded forms I shape or single V groove with root face opposite to each other.
Preferably, the angle of above-mentioned single V groove with root face should be not more than 15 °, the I shape groove can add or not add weldering
Silk, the single V groove with root face must add welding wire.
The present invention is with following the utility model has the advantages that radiating laser beams rifle position is in Variable Polarity side in (1) welding process of the present invention
In front of wave tungsten argon arc welding gun, radiating laser beams rifle is first opened, Variable Polarity Square-wave AC tungsten argon arc welding gun is then turned on, utilizes laser beam
Accurate guidance welding arc makes Variable Polarity Square-wave AC tungsten electrode argon-arc welding electric arc be no longer influenced by welding workpiece surface region to position to be welded
Pollutant or the interference of the sundries such as oxidation film and occur free, precision heating small-bore thin-wall tube position to be welded simultaneously reaches a high temperature molten
Melt state, to complete the precision welding of small-bore thin-wall tube；
(2) present invention accurately guides welding arc to position to be welded using laser beam, can also make electric arc not by any external world because
Element influences, and stablizes at position to be welded, helps to improve speed of welding, realizes high-speed welding；
(3) the negative polarity half-wave in the present invention can preheat weldment weld surface area and be in the condition of high temperature, and hemiwave time, amplitude are independent
It is adjustable, tungsten electrode scaling loss can be reduced, laser also makes welding arc stiffness good, and energy is concentrated, with speed of welding is fast, weld seam is narrow, hot
The features such as zone of influence, together by perfect combination the advantages of the two.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is welding situation schematic diagram of the invention.
In figure: 1. thin-wall tubes to be welded；2. radiating laser beams rifle；3. Variable Polarity Square-wave AC tungsten argon arc welding gun.
Specific embodiment
Presently in connection with attached drawing, the present invention is described in further detail with specific embodiment, all to be based on the following contents institute
The technology of realization belongs to the range that the present invention is protected.
Following implementation for welding the Aluminum Alloy Tube of 2mm thickness to be described in detail.
Laser model DSS266-Q1 used, pulsewidth < 1ns, wavelength 266nm, maximum repetition rate 5KHZ.
Variable Polarity Square-wave AC tungsten argon shielded arc welding machine model VPTIG-315, voltage rating 0-380V used receive arc electricity
Stream is 5-315A, cyclic duration factor 60%.
The specific work process of induced with laser Variable Polarity Square-wave AC Gas Tungsten Arc Welding small-bore of the present invention thin-wall tube is as follows:
(1) radiating laser beams rifle 2 and Variable Polarity Square-wave AC tungsten electrode rifle 3 are fixed on the same screw rod, as shown in Figure 1, it is opposite to
The moving direction of thin-wall tube 1 is welded, radiating laser beams rifle 2 is fixed on front, and Variable Polarity Square-wave AC tungsten electrode rifle 3 is fixed below.It is logical
The screw crossed on sliding screw can adjust the distance between Variable Polarity Square-wave AC tungsten electrode rifle 2 and radiating laser beams rifle 3, make laser
Spacing between beam center and the tungsten electrode center of Variable Polarity Square-wave AC argon tungsten-arc welding is 0.3 to 1.0mm, this distance can guarantee to swash
Light beam to the inducing action of welding arc, Variable Polarity Square-wave AC tungsten argon arc heat source carry out cathode clear with it is complete after anode melting metal
At welding, to guarantee welding quality.If hypotelorism, it is less than 0.3mm, will receive the influence of arc plasma cloud, cause laser
Arcing is induced to reduce；If hypertelorism, more than 1.0mm, good inducing action can not be obtained, to influence to weld matter
Amount and welding efficiency.
There to be certain thickness thin-wall tube to be welded (such as Aluminum Alloy Tube of above-mentioned 2mm thickness) forming docking, so that
The focus of Variable Polarity Square-wave AC tungsten electrode center and laser beam center just falls in the central area of 1 weld seam of thin-wall tube to be welded.Wherein,
The welding portion of thin-wall tube 1 to be welded has 0.1mm or smaller docking space.
The section of the welding portion of thin-wall tube to be welded forms I shape or single V groove with root face opposite to each other.If it is formation I shape
Groove, then having about 0.1mm or smaller butt seam in I shape groove；If it is single V groove with root face is formed, then Y shape slope
The angle of mouth should be not more than 15 °, if angle is too big, cathode protection is not enough to cover the weldment on both sides, and cathode cleaning is not thorough, and
And need to melt more welding wires, reduce speed of welding.The welding manner of the preferred I shape groove of 2mm or less thin-wall tube.
(2) with a constant speed progressive forming and mobile thin-wall tube 1 to be welded, the mobile side of thin-wall tube 1 to be welded
To direction as shown by the arrows in Figure 1, the mode of 3 postposition of Variable Polarity Square-wave AC tungsten argon arc welding gun is formed, laser beam is first emitted, then
Variable Polarity Square-wave AC of igniting tungsten argon arc welding gun induces electric arc to precisely align position to be welded by laser beam, and arc spot is to be welded
The welding position for connecing thin-wall tube carries out cathode cleaning and incipient melting, and welding position surface is made to be in high temperature fused state, thus
High-speed welding is carried out to thin-wall tube 1 to be welded along welding center line by radiating laser beams rifle 2 and Variable Polarity Square-wave AC tungsten electrode rifle 3.
Method particularly includes: after thin-wall tube 1 to be welded starts movement, laser beam is irradiated to position to be welded first, Variable Polarity of then igniting
Square wave tungsten argon arc welding gun guides Variable Polarity Square-wave AC tungsten argon arc to act on 1 butted part of thin-wall tube to be welded by laser beam
Surface, remove the sundries such as pollutant or the oxidation film in the face of weld region of 1 welding portion of thin-wall tube to be welded, and be allowed to
In high temperature fused state.
Wherein, the tungsten electrode of Variable Polarity Square-wave AC tungsten argon arc be negative be positive half-wave current with tungsten electrode can be separately adjustable, adjust model
It encloses for 5~300A.Due to DCEN, DCEP hemiwave time of Variable Polarity Square-wave AC argon tungsten-arc welding, half-wave current Independent adjustable, therefore
Specific value is different according to the characteristics and dimensions of 1 material of thin-wall tube to be welded, as long as guaranteeing that cleaning action of the cathode smoothly completes
In the case where, reduction DC reverse connection hemiwave time as far as possible such as in the present embodiment then selects forward and reverse electric current under normal circumstances
Amplitude is respectively 80 A and 120 A, and the forward and reverse turn-on time ratio of electric current is 4: 1, meanwhile, in plate thickness < 2mm, can be used
The positive and negative turn-on time ratio of electric current is 4:1.
Wherein, the defocusing amount of laser beam is -1 to 0mm, can meet the induction to tungsten argon arc, completes thin-wall pipe welding,
In the present embodiment, laser beam defocusing amount is -0.5mm.
Wherein, the direction of illumination in Variable Polarity Square-wave AC tungsten electrode is emitted electric arc direction and laser beam form an angle or
It is parallel to each other, and Variable Polarity Square-wave AC tungsten electrode acts perpendicularly to the welding position of thin-wall tube 1 to be welded, that is to say, that laser beam can
It forms an angle or vertical irradiation is to position to be welded.
In the welding process, because only that thin-wall tube to be welded 1 is mobile, so the movement speed of workpiece 1 just determines weldering
Speed is connect, different 1 movement speed of thin-wall tube to be welded and weldering can be selected according to characteristics and dimensions thickness of different materials etc.
Connect speed.Speed of welding is to penetrate workpiece as selection principle, when such as welding the Aluminum Alloy Tube of above-mentioned 2mm thickness, speed of welding choosing
Use 50mm/s.
Before carrying out high-speed welding, Variable Polarity Square-wave AC Gas Tungsten Arc Welding heat source effect is also can be improved in the pre-heat effect of laser beam
Rate.The cathode scavenging effect of one side argon arc welding eliminates some impurity, oxidation film, greasy dirt etc. for influencing welding quality, another
The effect of aspect anode melting is compounded with laser heat source to the heating of workpiece surface, improves the contraction concentration class of electric arc, makes electric arc
Arc column is shunk, and arc stiffness improves, and heat source heating efficiency improves.
(3) welding position, successive induction Variable Polarity Square-wave AC tungsten argon arc melting welding persistently then are irradiated using laser beam
Electric arc complete thin-wall tube persistently weld.
In the present invention material of thin-wall tube to be welded can be stainless steel, aluminium alloy, magnesium alloy, copper alloy, titanium alloy and
One or both of low-alloy steel.
Taking the above-mentioned ideal embodiment according to the present invention as inspiration, through the above description, relevant staff is complete
Various changes and amendments can be carried out without departing from the scope of the technological thought of the present invention' entirely.The technology of this invention
Property range is not limited to the contents of the specification, it is necessary to which the technical scope thereof is determined according to the scope of the claim.
Claims (10)
1. a kind of method of induced with laser Variable Polarity Square-wave AC Gas Tungsten Arc Welding small-bore thin-wall tube, it is characterised in that: including such as
Lower step:
(1) radiating laser beams rifle and Variable Polarity Square-wave AC tungsten argon arc welding gun are fixed, wherein radiating laser beams rifle is in preceding, Variable Polarity
Square wave tungsten argon arc welding gun needs the part docked that docking is formed rear, by thin-wall tube to be welded, wherein Variable Polarity Square-wave AC
Tungsten argon arc welding gun should be directed at the centre of workpiece welding portion to be welded in the surface at position to be welded, the focus of laser beam；
(2) progressive forming and mobile thin-wall tube to be welded, first emit laser beam, then the Variable Polarity Square-wave AC tungsten argon arc welding gun that ignites,
Electric arc is induced to precisely align position to be welded by laser beam, it is clear that arc spot carries out cathode to the welding position of thin-wall tube to be welded
It manages and incipient melting, welding position surface is made to be in high temperature fused state；
(3) welding position, the electricity of successive induction Variable Polarity Square-wave AC tungsten argon arc melting welding persistently then are irradiated using laser beam
Arc is completed thin-wall tube and is persistently welded.
2. the method for induced with laser Variable Polarity Square-wave AC Gas Tungsten Arc Welding small-bore as described in claim 1 thin-wall tube, special
Sign is: the tungsten electrode of the Variable Polarity Square-wave AC tungsten argon arc be negative be positive half-wave current with tungsten electrode can be separately adjustable, adjustable range
For 5~300A.
3. the method for induced with laser Variable Polarity Square-wave AC Gas Tungsten Arc Welding small-bore as described in claim 1 thin-wall tube, special
Sign is: the defocusing amount of the laser beam is -1 to 0mm.
4. the method for induced with laser Variable Polarity Square-wave AC Gas Tungsten Arc Welding small-bore as described in claim 1 thin-wall tube, special
Sign is: the spacing between the laser beam center and the tungsten electrode center of Variable Polarity Square-wave AC argon tungsten-arc welding is 0.3 to 1.0mm.
5. the method for induced with laser Variable Polarity Square-wave AC Gas Tungsten Arc Welding small-bore as described in claim 1 thin-wall tube, special
Sign is: the radiating laser beams rifle and Variable Polarity Square-wave AC tungsten argon arc welding gun are fixed on a screw rod, by adjusting laser
The distance between beam center and Variable Polarity Square-wave AC tungsten electrode center are welded.
6. the method for induced with laser Variable Polarity Square-wave AC Gas Tungsten Arc Welding small-bore as described in claim 1 thin-wall tube, special
Sign is: the welding portion of the thin-wall tube to be welded has 0.1mm or smaller docking space.
7. the method for induced with laser Variable Polarity Square-wave AC Gas Tungsten Arc Welding small-bore as described in claim 1 thin-wall tube, special
Sign is: the direction of illumination in electric arc direction and laser beam that the Variable Polarity Square-wave AC tungsten electrode is emitted forms an angle or phase
It is mutually parallel, and Variable Polarity Square-wave AC tungsten electrode acts perpendicularly to the welding position of thin-wall tube to be welded.
8. the method for induced with laser Variable Polarity Square-wave AC Gas Tungsten Arc Welding small-bore as described in claim 1 thin-wall tube, special
Sign is: the material of the thin-wall tube to be welded is in stainless steel, aluminium alloy, magnesium alloy, copper alloy, titanium alloy and low-alloy steel
One or two.
9. the method for induced with laser Variable Polarity Square-wave AC Gas Tungsten Arc Welding small-bore as described in claim 1 thin-wall tube, special
Sign is: the section of the thin-wall pipe welding part to be welded forms I shape or single V groove with root face opposite to each other.
10. the method for induced with laser Variable Polarity Square-wave AC Gas Tungsten Arc Welding small-bore as described in claim 1 thin-wall tube, special
Sign is: the angle of the single V groove with root face should be not more than 15 °, and the I shape groove can add or not add welding wire, the Y shape slope
Mouth must add welding wire.
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Cited By (2)
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| CN110860796A (en) * | 2019-09-13 | 2020-03-06 | 上海航天设备制造总厂有限公司 | Aluminum alloy small-current arc online cleaning auxiliary laser filler wire welding method |
| CN111360365A (en) * | 2020-03-31 | 2020-07-03 | 贵州大学 | Micro-arc spot welding control system |
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Application publication date: 20190521 |