CN109500478A - A kind of welding method that oxidizing gas is applied to tradition TIG - Google Patents
A kind of welding method that oxidizing gas is applied to tradition TIG Download PDFInfo
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- CN109500478A CN109500478A CN201811318470.7A CN201811318470A CN109500478A CN 109500478 A CN109500478 A CN 109500478A CN 201811318470 A CN201811318470 A CN 201811318470A CN 109500478 A CN109500478 A CN 109500478A
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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
-
- 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
- B23K9/12—Automatic feeding or moving of electrodes or work for spot or seam welding or cutting
-
- 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
- B23K9/32—Accessories
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- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
Abstract
The present invention relates to a kind of welding methods that oxidizing gas is applied to tradition TIG; it is sprayed from traditional TIG welding gun with traditional inert gas Ar as welding protection gas; the electric arc for stablizing burning is formed between tungsten electrode and workpiece, while by auxiliary gas transmission system, by oxidizing gas CO2Or O2It is inputted from stable electric arc periphery；The electric arc that energy is high, stiffness is good is obtained, increases thermal weld stress, the weld seam bigger than traditional TIG weld fusion penetration can be obtained under same weld technological parameter, while solving the problems, such as that tungsten electrode is oxidized scaling loss under oxidizing gas ingredient and weld seam is oxidized.The present invention is not only able to achieve the purpose for improving tradition TIG arc characteristic, but also can be effectively isolated tungsten electrode and oxidative components using the protective barrier that inertia protection gas is formed when traditional TIG weld, avoid its oxidization burning loss.Auxiliary gas transmission system cost in the present invention is low, controllability is good, adaptable.
Description
Technical field
The present invention relates to a kind of welding methods for improving tradition TIG weld penetration, by by oxidizing gas (O2Or
CO2) welded as auxiliary and gas is protected to be introduced into the argon arc of tradition TIG, improve the characteristic of argon arc, increases weld penetration.
Background technique
Traditional TIG weld method generallys use argon gas as welding protection gas, and be otherwise known as argon tungsten-arc welding, and electric arc is soft
It is its great advantage with welding quality stable.But the feature that argon arc energy density is small, stiffness is low causes its weld penetration shallow,
The slow disadvantage of speed of welding has seriously affected welding efficiency, this is always the problem faced in welding engineering application, improves tradition
TIG welds arc characteristic, improves traditional TIG weld method, promotes its welding efficiency always while taking into account TIG weld method advantage
It is the research direction and target of vast welding researcher.
By changing the type of protective gas and the arc characteristic of protected mode improvement tradition TIG, it is in response to the above problems
Most direct convenient and fast means.In common protection gas type, the He in inert gas can substitute Ar and realize the big fusion penetration weldering of high quality
It connects, but its cost is quite high, is not easy to promote；CO2And O2As oxidizing gas, gas Shi Yi is protected into its welding directly as TIG
Aoxidize tungsten electrode at high temperature, though using the inert gases such as itself and Ar according to a certain percentage mixed mixed gas as TIG's
Welding protection gas is also difficult to avoid the oxidization burning loss phenomenon of tungsten electrode, so its welding protective gas that can not be usually used as TIG,
But its arc energy is high, resourceful at low cost, if its influence to the harm of tungsten electrode oxidation and to weld seam oxidation can be overcome,
It is applied in traditional TIG weld method, this welding method will have broad application prospects.
Summary of the invention
It is an object of the invention to propose it is a kind of by oxidizing gas introduce tradition TIG welding method, obtain energy height,
The good electric arc of stiffness increases thermal weld stress, can obtain under same weld technological parameter bigger than traditional TIG weld fusion penetration
Weld seam, while solving the problems, such as that tungsten electrode is oxidized scaling loss under oxidizing gas ingredient and weld seam is oxidized.The welding method
On the basis of spraying the argon arc for forming stable burning from welding gun as welding protection gas with inert gas Ar, pass through auxiliary
Gas transmission system, by oxidizing gas (CO2Or O2) inputted from stable argon arc periphery, the argon arc because stablizing burning forms one
Protective barrier, so a large amount of oxidizing gas is trapped in electric arc periphery, this largely reduce oxidizing gas into
A possibility that entering internal arctube, especially at the arc center where tungsten electrode, which ensures that tungsten electrodes to be in Ar atmosphere not
It is oxidized, and the oxidizing gas in electric arc periphery is decomposed after reaching certain temperature and ionization reaction, on the one hand this is anti-
A large amount of heat should be absorbed, electric arc is promoted to shrink, improves arc energy density, improves heat input, improves welding efficiency, it is another
Aspect, the active component (O element) which generates can enter in molten bath under the action of arc plasma stream power, change molten
The content of active component in pond, to change Marangoni convection current direction to achieve the purpose that increase fusion penetration.
The technical scheme is that
A kind of welding method that oxidizing gas is applied to tradition TIG；With traditional inert gas Ar as welding
Protection gas is sprayed from traditional TIG welding gun 1, the electric arc 7 for stablizing burning is formed between tungsten electrode 2 and workpiece 6, while passing through auxiliary
Gas transmission system, by oxidizing gas CO2Or O2From stable 7 periphery input of electric arc.
In existing traditional TIG weld Equipment Foundations, a set of auxiliary plenum system of arranging in pairs or groups realizes CO2Or O2Input, on
Stating traditional TIG weld equipment includes welding gun 1 and tungsten electrode 2, and above-mentioned auxiliary plenum system includes gas cylinder, pressure reducing valve, flowmeter, gas transmission
Pipeline, quick coupling 5, gas transmission nozzle 3 and clamping device 4, wherein quick coupling 5, gas transmission nozzle 3 and clamping device 4 are this hair
Bright main component forms gas transmission access by being connected with air delivering pipeline, flowmeter, pressure reducing valve, gas cylinder；Pressure reducing valve and gas
The connection of bottle gas outlet；Flowmeter connects same pressure reducing valve and is connected；Air delivering pipeline is connected with flowmeter；Quick coupling 5 and air delivering pipeline phase
Even, gas transmission nozzle 3 is connected with quick coupling 5；Clamping device 4 is connected with gas transmission nozzle 3, at the same be connected with traditional TIG welding gun 1 with
It realizes and fixes.
Gas transmission nozzle 3 and 2 horizontal direction distance L of tungsten electrode1Control is in 5~15mm.
Gas transmission nozzle 3 and 2 vertical direction distance L of tungsten electrode2It should be greater than 0mm, i.e. 3 gas vent of nozzle is not above tungsten electrode
2 tip.
The gas vent center of gas transmission nozzle 3 should be directed at the central axis of argon arc, flow through the oxidation that nozzle 3 inputs in argon arc
The direction same level axis angle a that property gas is flowed out from nozzle 3 should be less than 90 °, i.e., cannot be with 1 keeping parallelism of welding gun.
The gas transmission nozzle 3 in auxiliary gas transmission system is kept to move synchronously when welding gun 1 moves, it is ensured that electric arc etc. in welding process
The component of gas ions is constant.
The orientation and angle of gas transmission nozzle 3 can be adjusted freely.
It is described as follows:
In existing traditional TIG weld Equipment Foundations, a set of auxiliary gas transmission system of arranging in pairs or groups realizes CO2Or O2Input, on
Stating auxiliary gas transmission system includes gas cylinder, pressure reducing valve, flowmeter, air delivering pipeline, quick coupling 5, gas transmission nozzle 3, clamping device 4.
Pressure reducing valve connect with gas cylinder gas outlet the high pressure gas in gas cylinder being converted to the low pressure gas that can be used；Flowmeter connects same pressure reducing valve
It is connected, controls the flow of low pressure gas；Air delivering pipeline is connected with flowmeter, completes the transmission process of a certain amount of low-pressure gas；It is defeated
Gas jets 3 are connected by quick coupling 5 with air delivering pipeline, and low pressure gas is delivered to electric arc peripheral region；Clamping device 4 and gas transmission
Nozzle 3 is connected, while being connected with traditional TIG welding gun 1 to realize and fix.
In above system use process, clamping device 4 is fixed on biography by fixing screws 8 and positioning screw 10 by the first step
It unites on TIG welding gun 1, the side where guaranteeing fixing screws 8 is the opposite direction of welding direction；Second step will by positioning screw 10
Gas transmission nozzle 3 is fixed on clamping device 4, realizes traditional TIG weld equipment with the connection of auxiliary plenum system；Third step passes through
Angle adjusting screw 9 and the cooperation of positioning screw 10 on clamping device 4 adjust position and the angle of gas transmission nozzle 3, gas transmission nozzle 3
The horizontal direction distance L between tungsten electrode 21Control is in 5~15mm, the distance L of vertical direction2It should be greater than 0mm, from gas transmission nozzle 3
The direction same level axis angle a of the gas of outflow is less than 90 °；4th step, by gas transmission nozzle 3 quick coupling 5 and appendix
Road connection；5th step opens gas cylinder, then adjusting pressure reducing valve makes pressure be no more than 0.5Mpa；6th step is set by traditional TIG weld
It is standby to complete striking, the electric arc 7 for stablizing burning is formed between tungsten electrode 2 and workpiece 6；7th step throttling meter knob, control stream
Amount is in certain range, and controlled range is between 0~10L/min, by 7 periphery of oxidizing gas input electric arc.
Gas passes through air delivering pipeline to gas transmission nozzle 3, gas transmission nozzle 3 by pressure reducing valve, flowmeter in the gas transmission system
It is combined closely with air delivering pipeline by the good quick coupling 5 of air-tightness, it is ensured that good air-tightness.
The gas transmission nozzle 3 is fixed on 1 direction of travel front end of welding gun by clamping device 4, it is ensured that its oxidisability gas exported
Body can not make high temperature weld seam and oxidizing gas because losing the protection of welding protective gas in welding direction of advance rear portion
It is in contact and is oxidized.
The clamping device 4 may be implemented freely to be adapted to different welding requirements to gas transmission nozzle orientation, angle.
The gas transmission nozzle 3 being capable of high temperature resistant.
The beneficial effects of the present invention are:
1. proposed by the present invention enter arc region realization and traditional argon gas electricity by auxiliary gas transmission system conveying oxidizing gas
The method of arc joint welding is not only able to achieve the purpose for improving tradition TIG arc characteristic, but also can utilize inertia when traditional TIG weld
The protective barrier for protecting gas to be formed, is effectively isolated tungsten electrode and oxidative components, avoids its oxidization burning loss.
2. the present invention utilizes the pyrolytic endothermic character of polyatom oxidizing gas, welding arc when welding this method
More traditional TIG weld electric arc is shunk, and energy is concentrated, and improves heat input, is conducive to increase welding penetration.
3. changing surface tension temperature gradient system using the O element being delivered in molten bath by auxiliary gas transmission system in the present invention
The transformation of several positive and negative realization molten bath convection models, promotes fusion penetration to increase.
4. the auxiliary gas transmission system in the present invention is kept completely separate with traditional TIG weld equipment, it does not interfere with each other, it can be achieved that individually
Adjust control.Oxidizing gas and inert gas are only just in contact after flowing out respective nozzle.
5. auxiliary gas transmission system cost in the present invention is low, controllability is good, adaptable.
Detailed description of the invention
Fig. 1 is the welding method welding process Central Plains TIG welding gun 1 and auxiliary gas transmission system assembling schematic diagram, and arrow is signified
For welding direction.
Fig. 2 (a) is obtained on Q235 with welding method proposed by the present invention from fusion welding seam molten bath cross section
Metallographic microscope.
Fig. 2 (b) is the metallographic from fusion welding seam molten bath cross section obtained on Q235 with traditional TIG weld method
Figure.
Fig. 3 the fusion penetration and molten wide in weld seam molten bath are measured after statistical result histogram；
Wherein: 1- welding gun, 2- tungsten electrode, 3- gas transmission nozzle, 4- clamping device, 5- quick coupling, 6- workpiece, 7- electric arc, 8-
Fixing screws, 9- angle adjusting screw, 10- positioning screw.
Specific embodiment
Assist the connection relationship in gas transmission system between each component are as follows: pressure reducing valve is connect with gas cylinder gas outlet；Flowmeter connects
It is connected with pressure reducing valve；Air delivering pipeline is connected with flowmeter；Gas transmission nozzle 3 is connected with quick coupling 5, the same appendix of quick coupling 5
Road is connected；Clamping device 4 is connected with gas transmission nozzle 3, while being connected with traditional TIG welding gun 1 to realize and fix.
As shown in Figure 1, welding gun 1 and tungsten electrode 2 are in former TIG weld equipment, welding protection gas argon gas flows out welding gun 1,
The electric arc 7 for stablizing burning is formed between tungsten electrode 2 and workpiece 6, gas transmission nozzle 3, clamping device 4, quick coupling 5 are auxiliary gas transmission system
The main component of system, clamping device 4 divide for two parts, and a part is fixed in original by fixing screws 8 and positioning screw 10
On TIG welding gun 1, another part is fixed on the gas transmission nozzle 3 of auxiliary gas transmission system by positioning screw 10, clamping device 4
Connection is realized by angle adjusting screw 9 between two parts, and passes through the angle of its gas transmission nozzle 3 for realizing auxiliary gas transmission system
The gas transmission nozzle 3 of adjustment, gas transmission system is connected by quick coupling 5 with air delivering pipeline, and welding direction front end is placed in, and is welded with TIG
Rifle 1 moves synchronously.
After striking during normal weld, pure inertia protection gas argon gas is flowed out by former argon arc welding gun 1, argon flow
Using the flow of normal weld specification, gas is ionized by the electric field of two interpolars, generates a large amount of charged particle, is formed steady
Surely the electric arc 7 to burn, electric arc convert electrical energy into thermal energy and pass to workpiece 6, melt to form molten bath in electric arc underlying workpiece, with
The movement of welding gun 1, for electric arc along moving in front of welding direction, the molten metal for welding rear, which then solidifies, forms weld seam.
The side of 1 direction of advance of welding gun shown in Fig. 1 introduces oxidizing gas (O2Or CO2), it is flowed from gas transmission nozzle 3
Out, gas flow should not be too large, and should be less than the flow of argon gas.The distance between nozzle 3 and tungsten electrode 2 should be controlled rationally, horizontal
The distance L in direction1In 5~15mm, hypertelorism will affect the content into the oxidizing gas in electric arc, be unable to reach for control
Increase the purpose of fusion penetration, hypotelorism easily causes the oxidization burning loss of gas transmission nozzle 3；The distance L of vertical direction2It should be greater than 0mm, i.e.,
Otherwise 3 gas vent of gas transmission nozzle will cause the oxidation of tungsten electrode not above the tip of tungsten electrode 2, while being less than the arc of electric arc 7
It is long.The gas vent center of gas transmission nozzle 3 should be directed at the central axis of argon arc, otherwise easily cause oxidative components in molten bath uneven
It is even, influence seam center.The gas flowed out from gas transmission nozzle 3, the direction same level axis angle a of outflow should be controlled rationally, a
It should be less than 90 °, i.e., cannot be with 1 keeping parallelism of welding gun, otherwise oxidizing gas cannot be introduced into arc region, and different angles will affect
Oxidizing gas enters the content of argon arc, and then influences the content of oxidative components in weld seam molten bath, influences final weld seam molten bath
Fusion penetration.
During welding gun 1 is moved along welding direction in Fig. 1, keep the gas transmission nozzle 3 in auxiliary gas transmission system synchronous
Movement, it is ensured that the component of arc-plasma is constant in welding process, to obtain forming good weld seam.
Fig. 2 is to be welded under same weld Parameter Conditions using welding method proposed by the present invention (Fig. 2 (a)) and tradition TIG
Method (Fig. 2 (b)) is connect on Q235 obtained from the metallographic microscope of fusion welding seam molten bath cross section.From the figure, it can be seen that identical weldering
Connect under technological parameter, the molten bath that traditional TIG is obtained is wide and shallow, the molten bath obtained using welding method proposed by the present invention it is narrow and
It is deep.
Fig. 3 is the histogram of the statistical result after measuring to the fusion penetration and molten wide in weld seam molten bath.It is mentioned using the present invention
The weld seam molten bath fusion penetration that welding method out obtains is 3.9mm, is 1.56 times of traditional TIG, and weld seam molten bath molten wide is 8.2mm,
It is the 9/10 of traditional TIG, it is 1.78 times of traditional TIG that weld seam molten bath depth-to-width ratio, which is 0.48,.By using the present invention known to comparison
The welding method of proposition can increase the fusion penetration of traditional TIG weld seam, increase depth-to-width ratio, improve welding efficiency.
Claims (7)
1. a kind of welding method that oxidizing gas is applied to tradition TIG, it is characterized in that making with traditional inert gas Ar
It is sprayed from traditional TIG welding gun (1) for welding protection gas, forms the electric arc for stablizing burning between tungsten electrode (2) and workpiece (6)
(7), while by auxiliary gas transmission system, by oxidizing gas CO2Or O2It is inputted from stable electric arc periphery.
2. the method as described in claim 1, it is characterized in that welding gun (1) and tungsten electrode (2) they are the component in former TIG weld equipment,
Welding protection gas argon gas flows out welding gun, and the electric arc (7) for stablizing burning is formed between tungsten electrode and workpiece (6)；Gas transmission nozzle (3),
Clamping device (4), quick coupling (5) are the main component for assisting gas transmission system, and clamping device is divided into two parts, and a part passes through
Fixing screws (8) and positioning screw (10) are fixed on former TIG welding gun, and another part is fixed on auxiliary by positioning screw
On the gas transmission nozzle of gas transmission system, connection is realized by angle adjusting screw (9) between two parts of clamping device, and pass through it
Realize the angle adjustment of the gas transmission nozzle of auxiliary gas transmission system, the gas transmission nozzle of gas transmission system passes through quick coupling and air delivering pipeline
It is connected, is placed in welding direction front end, is moved synchronously with TIG welding gun.
3. method according to claim 2, it is characterized in that gas transmission nozzle and tungsten electrode horizontal direction distance L1Control 5~
15mm。
4. method according to claim 2, it is characterized in that gas transmission nozzle and tungsten electrode vertical direction distance L2It should be greater than 0mm, i.e.,
Tip of 3 gas vent of nozzle not above tungsten electrode.
5. method according to claim 2, it is characterized in that the gas vent center of gas transmission nozzle should be directed at the central axis of argon arc
Line, flow through the direction same level axis angle a that is flowed out from gas transmission nozzle of oxidizing gas in gas transmission nozzle input argon arc answer it is small
It, cannot be with welding gun keeping parallelism in 90 °.
6. method according to claim 2, it is characterized in that keeping the gas transmission nozzle 3 in auxiliary gas transmission system same when welding gun moves
Step movement, it is ensured that the component of arc-plasma is constant in welding process.
7. method according to claim 2, it is characterized in that the orientation and angle of gas transmission nozzle can be adjusted freely.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811318470.7A CN109500478A (en) | 2018-11-07 | 2018-11-07 | A kind of welding method that oxidizing gas is applied to tradition TIG |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811318470.7A CN109500478A (en) | 2018-11-07 | 2018-11-07 | A kind of welding method that oxidizing gas is applied to tradition TIG |
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| CN102626813A (en) * | 2011-11-09 | 2012-08-08 | 兰州理工大学 | Coupling-arc AA-TIG welding method |
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| CN105312739A (en) * | 2015-11-03 | 2016-02-10 | 中国科学院长春光学精密机械与物理研究所 | Tungsten inert gas (TIG) welding device and method applicable to narrow-gap groove |
| JP2016036855A (en) * | 2014-08-08 | 2016-03-22 | 国立大学法人大阪大学 | Welding method for magnesium material |
| CN105904065A (en) * | 2016-04-29 | 2016-08-31 | 航天科工哈尔滨风华有限公司 | Bidirectional TIG automatic welding clamp with adjustable wire feed angle |
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2018
- 2018-11-07 CN CN201811318470.7A patent/CN109500478A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1845810A (en) * | 2003-08-04 | 2006-10-11 | 梅塞尔集团有限公司 | Method and device for non-vacuum electron beam welding metallic materials |
| CN101417363A (en) * | 2008-12-10 | 2009-04-29 | 中国科学院金属研究所 | Tungsten-electrode anti-oxidation double-layer air-flow protection welding method |
| CN102626813A (en) * | 2011-11-09 | 2012-08-08 | 兰州理工大学 | Coupling-arc AA-TIG welding method |
| CN102764930A (en) * | 2012-07-19 | 2012-11-07 | 中国科学院金属研究所 | TIG (tungsten inert gas) welding method for high-nitrogen steel under double-layer gas flow shielding |
| JP2016036855A (en) * | 2014-08-08 | 2016-03-22 | 国立大学法人大阪大学 | Welding method for magnesium material |
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Application publication date: 20190322 |