CN103100799A - Alloy welding wire for pulsed argon arc welding of Ti-alloy and Al-alloy - Google Patents
Alloy welding wire for pulsed argon arc welding of Ti-alloy and Al-alloy Download PDFInfo
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- CN103100799A CN103100799A CN2012105342326A CN201210534232A CN103100799A CN 103100799 A CN103100799 A CN 103100799A CN 2012105342326 A CN2012105342326 A CN 2012105342326A CN 201210534232 A CN201210534232 A CN 201210534232A CN 103100799 A CN103100799 A CN 103100799A
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Abstract
The invention provides an alloy welding wire for pulsed argon arc welding of Ti-alloy and Al-alloy. The alloy welding wire which is specifically proportioned and coated with active agents is adopted for carrying out high-frequency impulse arc initiation welding on the Ti-alloy and the Al-alloy, filler metal can be fused in the process of welding the Ti-alloy and the Al-alloy, a welded line is formed by solidification after the filler metal and the base Al-alloy are fully fused and mixed, and besides, an obvious fusion zone is formed; the high-fusion-point Ti-alloy interacts with the fused welding wire filler metal to form brazed connection, and liquid-phase metal Ti and liquid-phase metal Al can be prevented from being mixed and generating a large amount of fragile Ti-Al inter-metallic compound; and besides, compared with a conventional argon tungsten-arc welding method, arc stability of the argon arc welding of the Ti-alloy and pure Al dissimilar metal is greatly improved, meanwhile, the active agents on the surface of the welding wire can have the function of increasing welding penetration, and therefore a welded joint which is attractive in welded line formation and free of flaws can be obtained. Therefore, the alloy welding wire for the pulsed argon arc welding of the Ti-alloy and the Al-alloy has the advantages of being capable of improving production efficiency and improving welded joint performance, and convenient to operate.
Description
Technical field
The invention belongs to the welding technology field of foreign material, particularly a kind of alloy welding wire of the pulsed argon arc welding for Ti and Al alloy.
Background technology
Many excellent characteristics such as that titanium alloy has is lightweight, intensity is large, heat resistance is strong, corrosion-resistant are described as " following metal ", are the new structural materials with development prospect.Titanium and alloy thereof not only have very important application in aviation, space travel industry, and have begun extensive use in many industrial departments such as chemical industry, oil, light industry, metallurgy, generating.Aluminium alloy has the advantages such as specific strength is high, processability good, Physical and mechanical properties is superior, anticorrosive, is considered to the most economical and the most practical material in a lot of applications.Under most of environmental conditions, be included in air, water (or salt solution), petrochemistry and a lot of chemical system, aluminium alloy can demonstrate good corrosion resistance.The surface of aluminium has the reflectivity of height.Aluminium demonstrates good electrical conductivity and thermal conductivity usually, and some special aluminum alloy with high resistivity are also succeeded in developing, and these alloys can be used in motor as high torque (HT).Aluminium is often selected due to its excellent conductivity.On equiponderant basis, the electrical conductivity of aluminium is bordering on the twice of copper.Titanium alloy and aluminium alloy are extremely important in industrial application, the fields that have a lot of industry to intersect, and it is significant that this makes aluminium be connected connection with titanium.But aluminium is connected the connection difficulty with titanium very large.In welding process, because the solubility between Ti and Al is minimum at ambient temperature, because the hot physical and chemical performance between the aluminium titanium differs greatly, can produce the intermetallic compound of a large amount of fragility when welding with traditional welding method, thereby affect joint performance.At present, traditional welding method of Ti/Al different alloys mainly contains the molten soldering of electric arc, diffusion welding (DW), soldering, friction welding (FW) etc.
Diffusion welding (DW) is that two weldments are combined closely, and in vacuum or protective atmosphere, keeps a period of time under uniform temperature and pressure, makes the atom phase counterdiffusion between contact-making surface complete welding.Therefore the diffusion welding (DW) characteristics that still can effectively avoid aluminium titanium material melting point to differ greatly and be difficult to connect.Proof after check, the mechanical strength of the welding point of vacuum diffusion welding, heat endurance, sealing, corrosion resistance and elasticity can satisfy the specification requirement of important component.But this welding method requires the vacuum environment compacted under, and from economical production, cost is larger, is not suitable for aluminium titanium material in enormous quantities and connects moulding.
Electric arc heated is concentrated, and heat input is little, and is easy to operate, efficient energy-saving easily is automated again, after this welding method soldering the distortion very little, insensitive to the fit-up gap, and heat time heating time is short, consume littlely, cost is low, and the thermal treatment zone is narrow, heat more concentrated, heat input is little, and the heat affected area is narrow, and after soldering, distortion is little.But in realizing that the aluminium titanium dissimilar metal connects the process of moulding, if adopt general arc brazing method, welding process has following shortcoming: the heat radiation of titanium is large, existing equipment is expensive, the production cycle is long.
Adopt general welding method to be difficult to realize efficient, the reliable welding of Ti and Al.For example, liquid welding method can produce compound between a large amount of brittle metals, and the solid welding method butt joint substantive requirements of form again is too harsh.Adopt the method for molten soldering, with the aluminium fusing, it is solid-state that titanium keeps, and can effectively avoid like this forming a large amount of crisp hard intermetallic compounds between titanium aluminium, can obtain high-intensity joint, compares with Solid-phase welding with melting, has obvious superiority.
Adopt laser as thermal source, have flexible, energy density is high, the hot spot form is adjustable, the heat input series of advantages such as accurately controlled and cooling velocity is fast.But the assembly precision of butt-welding fitting is strict, and equipment cost is higher.
Summary of the invention
The present invention is for solving the deficiency of above-mentioned existing solder technology, and a kind of alloy welding wire of the pulsed argon arc welding for Ti and Al alloy is provided.
To achieve these goals, the present invention adopts following technical scheme, a kind of alloy welding wire of the pulsed argon arc welding for Ti and Al alloy, and the alloy welding wire diameter is 1.0-2.0mm, its mass percent composition is:
Si 4.9-5.8 %，
Fe 0.8-0.9 %，
Cu 0.3-0.4 %,
Mn 0.05-0.1 %，
Mg 0.06-0.09 %，
Zn 0.12-0.19 %，
Ti 0.22-0.28 %，
Surplus is Al;
And welding wire surface scribbles activating agent, and the mass percent component of this activating agent is: coat activating agent at welding wire surface, the mass percent component of this activating agent is: SiO
2: 31%; TiO
2: 27%; Cr
2O
3: 5%; CaF
2: 10%; MnCl
2: 24%, all the other are BaCl
2
Then selecting thickness is titanium alloy sheet to be connected and the aluminium alloy plate of 1.5-2.5mm, first titanium alloy sheet face to be connected is processed groove angle and be the groove of 35-40 °; Fully polish to remove its surface oxide layer for alloy sheets sand for surface paper to be connected, and it is surperficial to clean mother metal with ethanol or acetone, makes the roughness of surface to be welded reach Ra 1.8-3; Titanium alloy sheet is docked placement with the aluminium alloy plate level, do not stay the gap; First butt-welding fitting just, the back side logical argon shield 8-10min simultaneously, protective gas is purity greater than 99.98% argon gas; Adopt the high-frequency impulse striking, first open argon gas before striking, keep circulation 20s～30s, and utilize argon gas stream to take away to be attached to the moisture on the wireway inwall, electric arc ignites at titanium and aluminium joint place; Technological parameter is: background current 40A～60A, pulse current 38A～80A, pulse duration 5s～10s, pulse frequency 35Hz～65Hz, weldingvoltage 8V～16V, the joint tow sides are filled argon gas and are protected, argon flow amount 8L/min～16L/min, torch neck from workpiece apart from 8mm～12mm, angle between welding gun tungsten electrode and weldment is 70 °～85 °, and welding wire is sent into the molten bath steadily, uniformly along the molten bath front end; When receiving arc, receiving the arc place increases the welding wire loading until arc crater fills up, and then controls the welding current decay of delaying time gradually, and after current interruption, argon gas continues the 10s～20s that circulates, to prevent the tungsten electrode oxidation; After welding finishes, continue logical argon shield 2-4min.
Titanium alloy and aluminium alloy fusing point differ larger, the present invention utilizes the fusing point difference of titanium and two kinds of mother metals of aluminium alloy, proposition has the welding wire of specific proportioning, it is melted in welding process fill metal and the abundant melt-blended after coagulation formation weld seam of aluminium alloy mother metal, and have obvious fusion area; The formation soldering is connected and the high-melting-point titanium alloy is with the generation interaction of filler wire filling metal, avoid two kinds of metal liquid phase Ti, Al to mix and generate the Ti-Al intermetallic compound of a large amount of fragility, and compare with conventional tungsten argon arc soldering method, the titanium alloy that the present invention proposes and the arc stability of fine aluminium dissimilar metal argon arc welding obviously improve, the activating agent of welding wire surface can play the effect that increases welding penetration simultaneously, thereby obtains appearance of weld welding point attractive in appearance, flawless.
The invention has the beneficial effects as follows, the pre-aluminising of not only having avoided relating in vacuum diffusion welding technique is processed, and has reduced again the welding cost of vacuum environment or lasing condition, and has improved production efficiency, improves joint performance, and is easy to operate.
The specific embodiment
The invention will be further described below in conjunction with embodiment.
Embodiment 1
1) selecting thickness is TA9 titanium alloy sheet to be connected and 2024 aluminium alloy plates of 1.5mm, first titanium alloy sheet face to be connected is processed groove angle and be the groove of 35 °;
2) fully polish to remove its surface oxide layer for alloy sheets sand for surface paper to be connected, and it is surperficial to clean mother metal with ethanol or acetone, makes the roughness of surface to be welded reach Ra 1.8;
3) adopting diameter is the alloy welding wire of 1.0mm, and its mass percent composition is:
Si 4.9 %，
Fe 0.8 %，
Cu 0.3 %,
Mn 0.05 %，
Mg 0.06 %，
Zn 0.12 %，
Ti 0.22 %，
Surplus is Al;
4) welding wire is immersed 50%H
2O+50%HNO
3Solution rinses post-drying with clear water after 15min, then polishes with sand paper;
5) coat activating agent at welding wire surface again, the mass percent component of this activating agent is: SiO
2: 31%; TiO
2: 27%; Cr
2O
3: 5%; CaF
2: 10%; MnCl
2: 24%, all the other are BaCl
2
6) titanium alloy sheet is docked placement with the aluminium alloy plate level, do not stay the gap;
7) first butt-welding fitting just, the back side logical argon shield 8min simultaneously, protective gas is purity greater than 99.98% argon gas;
8) adopt the high-frequency impulse striking, first open argon gas before striking, keep circulation 20s, and utilize argon gas stream to take away to be attached to the moisture on the wireway inwall, electric arc ignites at titanium and aluminium joint place; Technological parameter is: background current 40A, pulse current 38A, pulse duration 5s, pulse frequency 35Hz, weldingvoltage 8V, the joint tow sides are filled argon gas and are protected, argon flow amount 8L/min, torch neck from workpiece apart from 8mm, angle between welding gun tungsten electrode and weldment is 70 °, and welding wire is sent into the molten bath steadily, uniformly along the molten bath front end; When receiving arc, receiving the arc place increases the welding wire loading until arc crater fills up, and then controls the welding current decay of delaying time gradually, and after current interruption, argon gas continues the 10s that circulates, to prevent the tungsten electrode oxidation;
9) after welding finishes, continue logical argon shield 2-4min.
Resulting titanium alloy and aluminium alloy banjo fixing butt jointing appearance of weld are attractive in appearance.Do not find the microdefects such as crackle, pore through the metallography microscope sem observation, connector area is in conjunction with good.
Embodiment 2:
1) selecting thickness is TA15 titanium alloy sheet to be connected and the 5A06 aluminium alloy plate of 1.8mm, first titanium alloy sheet face to be connected is processed groove angle and be the groove of 35 °;
2) fully polish to remove its surface oxide layer for alloy sheets sand for surface paper to be connected, and it is surperficial to clean mother metal with ethanol or acetone, makes the roughness of surface to be welded reach Ra 1.8-3;
3) adopting diameter is the alloy welding wire of 1.5mm, and its mass percent composition is:
Si 5.2 %，
Fe 0.8 %，
Cu 0.3 %,
Mn 0.07 %，
Mg 0.08 %，
Zn 0.17 %，
Ti 0.23 %，
Surplus is Al;
4) welding wire is immersed 50%H
2O+50%HNO
3Solution rinses post-drying with clear water after 18min, then polishes with sand paper;
5) coat activating agent at welding wire surface again, the mass percent component of this activating agent is: SiO
2: 31%; TiO
2: 27%; Cr
2O
3: 5%; CaF
2: 10%; MnCl
2: 24%, all the other are BaCl
2
6) titanium alloy sheet is docked placement with the aluminium alloy plate level, do not stay the gap;
7) first butt-welding fitting just, the back side logical argon shield 9min simultaneously, protective gas is purity greater than 99.98% argon gas;
8) adopt the high-frequency impulse striking, first open argon gas before striking, keep circulation 25s, and utilize argon gas stream to take away to be attached to the moisture on the wireway inwall, electric arc ignites at titanium and aluminium joint place; Technological parameter is: background current 50A, pulse current 51A, pulse duration 8s, pulse frequency 50Hz, weldingvoltage 12V, the joint tow sides are filled argon gas and are protected, argon flow amount 12L/min, torch neck from workpiece apart from 10mm, angle between welding gun tungsten electrode and weldment is 80 °, and welding wire is sent into the molten bath steadily, uniformly along the molten bath front end; When receiving arc, receiving the arc place increases the welding wire loading until arc crater fills up, and then controls the welding current decay of delaying time gradually, and after current interruption, argon gas continues the 15s that circulates, to prevent the tungsten electrode oxidation;
9) after welding finishes, continue logical argon shield 3min.
Resulting TA15 titanium alloy and 5A06 aluminium alloy banjo fixing butt jointing appearance of weld are attractive in appearance.Do not find the microdefects such as crackle, pore through the metallography microscope sem observation, connector area is in conjunction with good.
Embodiment 3:
1) selecting thickness is TA12 titanium alloy sheet to be connected and 5052 aluminium alloy plates of 2.5mm, first titanium alloy sheet face to be connected is processed groove angle and be the groove of 40 °;
2) fully polish to remove its surface oxide layer for alloy sheets sand for surface paper to be connected, and it is surperficial to clean mother metal with ethanol or acetone, makes the roughness of surface to be welded reach Ra 3;
3) adopting diameter is the alloy welding wire of 2.0mm, and its mass percent composition is:
Si 5.8 %，
Fe 0.9 %，
Cu 0.4 %,
Mn 0.1 %，
Mg 0.09 %，
Zn 0.19 %，
Ti 0.28 %，
Surplus is Al;
4) welding wire is immersed 50%H
2O+50%HNO
3Solution rinses post-drying with clear water after 20min, then polishes with sand paper;
5) coat activating agent at welding wire surface again, the mass percent component of this activating agent is: SiO
2: 31%; TiO
2: 27%; Cr
2O
3: 5%; CaF
2: 10%; MnCl
2: 24%, all the other are BaCl
2
6) titanium alloy sheet is docked placement with the aluminium alloy plate level, do not stay the gap;
7) first butt-welding fitting just, the back side logical argon shield 10min simultaneously, protective gas is purity greater than 99.98% argon gas;
8) adopt the high-frequency impulse striking, first open argon gas before striking, keep circulation 30s, and utilize argon gas stream to take away to be attached to the moisture on the wireway inwall, electric arc ignites at titanium and aluminium joint place; Technological parameter is: background current 60A, pulse current 80A, pulse duration 10s, pulse frequency 65Hz, weldingvoltage 16V, the joint tow sides are filled argon gas and are protected, argon flow amount 16L/min, torch neck from workpiece apart from 12mm, angle between welding gun tungsten electrode and weldment is 85 °, and welding wire is sent into the molten bath steadily, uniformly along the molten bath front end; When receiving arc, receiving the arc place increases the welding wire loading until arc crater fills up, and then controls the welding current decay of delaying time gradually, and after current interruption, argon gas continues the 20s that circulates, to prevent the tungsten electrode oxidation;
9) after welding finishes, continue logical argon shield 4min.
Resulting TA12 titanium alloy and 5052 aluminium alloy banjo fixing butt jointing appearances of weld are attractive in appearance.Do not find the microdefects such as crackle, pore through the metallography microscope sem observation, connector area is in conjunction with good.
Claims (1)
1. an alloy welding wire that is used for the pulsed argon arc welding of Ti and Al alloy, is characterized in that, the alloy welding wire diameter is 1.0-2.0mm, and its mass percent composition is:
Si 4.9-5.8 %，
Fe 0.8-0.9 %，
Cu 0.3-0.4 %,
Mn 0.05-0.1 %，
Mg 0.06-0.09 %，
Zn 0.12-0.19 %，
Ti 0.22-0.28 %，
Surplus is Al;
And welding wire surface scribbles activating agent, and the mass percent component of this activating agent is: coat activating agent at welding wire surface, the mass percent component of this activating agent is: SiO
2: 31%; TiO
2: 27%; Cr
2O
3: 5%; CaF
2: 10%; MnCl
2: 24%, all the other are BaCl
2
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012105342326A CN103100799A (en) | 2012-12-12 | 2012-12-12 | Alloy welding wire for pulsed argon arc welding of Ti-alloy and Al-alloy |
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|---|---|---|---|
| CN2012105342326A CN103100799A (en) | 2012-12-12 | 2012-12-12 | Alloy welding wire for pulsed argon arc welding of Ti-alloy and Al-alloy |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103084716A (en) * | 2013-02-28 | 2013-05-08 | 山东大学 | Pulse gas metal arc welding technology of titanium-aluminium micro laminated composite |
| CN104625331A (en) * | 2015-01-15 | 2015-05-20 | 山东大学 | Titanium alloy and pure aluminum fluxing-agent-added ternary gas shielded welding method |
-
2012
- 2012-12-12 CN CN2012105342326A patent/CN103100799A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103084716A (en) * | 2013-02-28 | 2013-05-08 | 山东大学 | Pulse gas metal arc welding technology of titanium-aluminium micro laminated composite |
| CN103084716B (en) * | 2013-02-28 | 2015-03-25 | 山东大学 | Pulse gas metal arc welding technology of titanium-aluminium micro laminated composite |
| CN104625331A (en) * | 2015-01-15 | 2015-05-20 | 山东大学 | Titanium alloy and pure aluminum fluxing-agent-added ternary gas shielded welding method |
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Application publication date: 20130515 |