CN103084714A - Laser preprocessing wire filling tungsten inert gas (TIG) welding method of titanium alloy and pure aluminum sheets - Google Patents
Laser preprocessing wire filling tungsten inert gas (TIG) welding method of titanium alloy and pure aluminum sheets Download PDFInfo
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- 238000003466 welding Methods 0.000 title claims abstract description 100
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 68
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 66
- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 33
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 title claims abstract description 17
- 229910052721 tungsten Inorganic materials 0.000 title claims abstract description 17
- 239000010937 tungsten Substances 0.000 title claims abstract description 17
- 238000007781 pre-processing Methods 0.000 title abstract 3
- 239000011261 inert gas Substances 0.000 title abstract 2
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- 238000012545 processing Methods 0.000 claims abstract description 8
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- 239000004411 aluminium Substances 0.000 claims description 28
- 229910052786 argon Inorganic materials 0.000 claims description 25
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 15
- 229910052751 metal Inorganic materials 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 11
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 10
- 239000007789 gas Substances 0.000 claims description 10
- 229910052742 iron Inorganic materials 0.000 claims description 10
- 229910052710 silicon Inorganic materials 0.000 claims description 10
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 5
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 5
- 229910052779 Neodymium Inorganic materials 0.000 claims description 5
- 244000137852 Petrea volubilis Species 0.000 claims description 5
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 5
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- 229910052749 magnesium Inorganic materials 0.000 claims description 5
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- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 claims description 5
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Abstract
The invention provides a laser preprocessing wire filling tungsten inert gas (TIG) welding method of titanium alloy and pure aluminum sheets. Firstly, a titanium alloy sheet and a pure aluminum sheet are cleaned. Secondly, a to-be-welded part of the titanium alloy sheet undergoes liquid immersing processing. Thirdly, a laser is utilized to preprocess the to-be-welded surface of the lateral side of the titanium alloy sheet, wherein the surface of the lateral side of the titanium alloy sheet undergoes aluminizing so that a stable middle layer which is easy to combine is formed, and meanwhile, after laser processing, the to-be-welded surface of titanium alloy undergoes self cooling quenching. Finally, a welding wire with specific proportioning is utilized for TIG of titanium and the pure aluminum sheet, and the titanium alloy sheet and the aluminum sheet can be connected through the middle layer by welding. The laser preprocessing wire filling TIG welding method of the titanium alloy and pure aluminum sheets improves plasticity and toughness of a joint, operation is simple, cost is low, and connection effect is good.
Description
Technical field
The invention belongs to the welding technology field of foreign material, particularly the laser pre-treated of a kind of titanium alloy and pure aluminum sheets silk filling TIG welding method.
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.The application of titanium alloy relates to many fields, and is the most outstanding with the application in aerospace field.Aluminium alloy is main structural material in aircraft manufacturing, most of crucial load bearing component (as wing, shell, empennage etc.) is by the aluminium alloy manufacturing, 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 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 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.Because titanium alloy and aluminium alloy have some special performance, Ti and A1 composite component are applied at aerospace field and chemical industry electrolytic industry as a kind of new structural material, the Ti/Al composite construction has good stability, heat-insulating sound-insulating and the performance such as high temperature resistant, can bring into play to greatest extent the characteristic potentiality of bi-material, titanium alloy and aluminium are extremely important in industrial application, the fields that have a lot of industry to intersect, it is significant that this makes aluminium be connected connection with titanium.
But aluminium is connected the connection difficulty with titanium very large.The physicochemical properties of titanium and aluminium (as fusing point, crystal structure, thermal conductivity factor, thermal coefficient of expansion etc.) differ greatly, particularly embrittlement very easily occurs in titanium when heating and cooling, adopt conventional fusion welding method to realize Ti and acquire a certain degree of difficulty reliable connection of A1, when reaching the fusing point of Ti, the evaporation of A1 melting loss of elements.Ti is reactive metal, and 300 ℃ of strong oxidations of beginning, more the hyperoxia voltinism is more serious for temperature, generates TiO
2Deng oxide, form crisp hard Ti-A1 intermetallic compound brittle layer in weld seam, make weld seam embrittlement or generation, namely 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.
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 simple arc brazing method, welding process has following shortcoming: the heat radiation of titanium is large, existing equipment is expensive, the production cycle is long.
The scholar's research such as Li Yajiang the vacuum diffusion welding of Ti and Al, and near the tissue diffuse interface and micro structure are analyzed.Yet diffusion welding (DW) is that two weldments are closely superimposed, and contact area is larger, and need to keep a period of time under uniform temperature and pressure in vacuum or protective atmosphere, makes the atom phase counterdiffusion between contact-making surface complete welding.But this method is higher to welding procedure and parameter request, easily cause the compound component of weld and organize not of uniform size causing, and this welding method requirement vacuum environment compacted under, from economical production, cost is larger, is not suitable for aluminium titanium material in enormous quantities and connects moulding.
Summary of the invention
The present invention provides the laser pre-treated silk filling TIG welding method of a kind of titanium alloy and pure aluminum sheets for solving the deficiency of above-mentioned existing solder technology.
To achieve these goals, the present invention adopts following technical scheme, and the laser pre-treated silk filling TIG welding method of titanium alloy of the present invention and pure aluminum sheets comprises the following steps:
1) selecting thickness is titanium alloy sheet and the pure aluminum plate of the equal thickness of 2.5-3.5mm, open the groove of equidimension at the side of two plates, the angle of the V-structure that the side groove docking of two plates forms is the 10-20 degree, then carry out surface treatment for titanium alloy sheet and pure aluminum plate part to be welded respectively, handling process is: use sand papering, and------------washing---acetone cleaning---oven dry is to remove oxide layer, impurity and the greasy dirt of plate surface in the diluted hydrofluoric acid corrosion in washing in the cleaner for metal oil removing;
2) first prepare the solution of following proportioning: 93%-94% commercial-purity aluminium, 4% Fe and 2%-3% Si, then titanium alloy sheet part to be welded is carried out liquid and soak processing, the time of staying is 22-28 minute, and heating-up temperature is 690-720 ℃, and the plating aluminum layer thickness of formation is controlled at 80-130 μ m;
3) to the side edge surface employing laser pre-treated of titanium alloy sheet through aluminising, adopting output wavelength is the neodymium doped yttrium aluminium garnet laser of 1064nm, the focus lamp focal length is 170-180mm, the absolute value of the side edge surface that laser spot is to be welded apart from titanium alloy sheet is 2.8-3.5 mm, the output continuous wave laser, pretreatment laser power 2 ~ 3 kW, sweep speed is 1.5 ~ 2.5 m/min, pretreated titanium alloy sheet in translation also with the direction of translation vertical on move back and forth, rate travel is 1.2 ~ 2m/min;
4) adopting diameter is the alloy welding wire of 0.8-1.5mm, and its mass percent composition is:
Magnesium: 5.2-6.35%, silicon: 0.09-0.12 %, manganese: 0.12-0.2 %, iron: 0.25-0.4 %, carbon: 0.05-0.1 %, titanium: 0.05-0.15 %, phosphorus: 0.05-0.07%, surplus is aluminium;
Welding wire is immersed 50%H
2O+50%HNO
3Solution rinses post-drying with clear water after 15-20min, then polishes with sand paper;
5) titanium alloy sheet is docked placement with pure aluminum plate in same plane, the fit-up gap at narrow place is 0.1mm-0.12mm;
6) first butt-welding fitting just, the back side logical argon shield 8-10min simultaneously, protective gas is purity greater than 99.98% argon gas;
7) adopt the TIG welding that fills silk to carry out the tungsten electrode welding, argon arc welding adopts tungsten-thorium electrode, and the content of tungsten is 99.9%, tungsten electrode diameter 1.8-2.8mm, and the end is taper; Technological parameter is: weldingvoltage 12V, and welding current 80-120A, speed of welding is 60-90mm/min, argon flow amount is 8-10L/min; In the welding process, keep 60-75 ° of angle between welding wire and weldment, welding wire is sent into the molten bath steadily, uniformly along the molten bath front end;
8) after welding finishes, continue logical argon shield 6-10min.
As a preferred embodiment, titanium alloy sheet docks placement in same plane with pure aluminum plate, and the fit-up gap at narrow place is 0.1mm.
Directly be superimposed together from titanium and aluminum surface layer and weld and have at the combination interface place that interrupted micro-crack, joint bond strength are very low different is, the present invention first adopts and titanium alloy sheet part to be welded is carried out liquid soaks processing, the aluminized coating with preferred thickness of formation; Then adopt laser instrument to carry out pretreatment to the titanium alloy sheet side edge surface through aluminising to be welded, make irradiated surface temperature rise rapidly, thereby the accelerated fusing of the aluminium that makes aluminized coating, thereby make aluminium element and titanium elements counterdiffusion mutually, form the intermediate layer of stable easier combination, create condition for follow-up soldering, can use too harsh welding condition and step; Simultaneously, after laser treatment, self-quench hardening is carried out on the surface to be welded of titanium alloy, crystallite dimension obtains obvious refinement, the refinement of crystal grain means that crystal boundary increases, under identical external cooling and sweating heat initial conditions, welding heat affected zone obviously reduces, and the welding heat loss also obviously reduces, help the enforcement of follow-up welding process, and be conducive to the homogenising of welding point microstructure.Thereby make by welding at last and be connected intermediate layer realization connection at titanium alloy sheet with aluminium sheet, it is the magnalium welding wire of 640-670 ℃ that the present invention adopts the fusing point of constituent optimization, in welding process, filler wire is filled metal and the abundant melt-blended after coagulation formation weld seam of aluminium alloy mother metal, and has obvious fusion area; Do not have fusion defects in whole welding process, weld hot cracking tendency and organize the heat affected area, jointing quality and stability thereof are better; Thereby overcome the defective that partial melting that existing melting welding interface temperature easily causes high-melting-point mother metal titanium alloy when too high forms blocked up intermetallic compounds layer, avoided the generation of crackle, from plasticity and the toughness that has improved weld seam.Simple to operate, cost is low, good connecting effect.
The invention has the beneficial effects as follows, reduced the vacuum environment welding cost, and improved production efficiency, improve joint performance, easy to operate.
The specific embodiment
The invention will be further described below in conjunction with embodiment.
Embodiment 1
1) select thickness to be Ti-6Al-4V titanium alloy sheet and 1060 pure aluminum plates of 2.5mm, open the groove of equidimension at the side of two plates, the angle of the V-structure that the side groove docking of two plates forms is 20 degree, then carry out surface treatment for titanium alloy sheet and pure aluminum plate part to be welded respectively, handling process is: use sand papering, and------------washing---acetone cleaning---oven dry is to remove oxide layer, impurity and the greasy dirt of plate surface in the diluted hydrofluoric acid corrosion in washing in the cleaner for metal oil removing;
2) first prepare the solution of following proportioning: 93% commercial-purity aluminium, 4% Fe and 3% Si, then titanium alloy sheet part to be welded to be carried out liquid and soak processing, the time of staying is 22 minutes, and heating-up temperature is 690 ℃, and the plating aluminum layer thickness of formation is controlled at 80 μ m;
3) to the side edge surface employing laser pre-treated of titanium alloy sheet through aluminising, adopting output wavelength is the neodymium doped yttrium aluminium garnet laser of 1064nm, the focus lamp focal length is 170mm, the absolute value of the side edge surface that laser spot is to be welded apart from titanium alloy sheet is 3.3-3.5 mm, the output continuous wave laser, pretreatment laser power 2kW, sweep speed is 1.5m/min, pretreated titanium alloy sheet in translation also with the direction of translation vertical on move back and forth, rate travel is 2m/min;
4) adopting diameter is the alloy welding wire of 1.5mm, and its mass percent composition is:
Magnesium: 5.2%, silicon: 0.09 %, manganese: 0.12 %, iron: 0.25 %, carbon: 0.05 %, titanium: 0.05 %, phosphorus: 0.05%, surplus is aluminium;
Welding wire is immersed 50%H
2O+50%HNO
3Solution rinses post-drying with clear water after 15min, then polishes with sand paper;
5) titanium alloy sheet is docked placement with pure aluminum plate in same plane, the fit-up gap at narrow place is 0.1mm;
6) first butt-welding fitting just, the back side logical argon shield 8min simultaneously, protective gas is purity greater than 99.98% argon gas;
7) adopt the TIG welding that fills silk to carry out the tungsten electrode welding, argon arc welding adopts tungsten-thorium electrode, and the content of tungsten is 99.9%, tungsten electrode diameter 1.8mm, and the end is taper; Technological parameter is: weldingvoltage 12V, and welding current 80A, speed of welding is 60mm/min, argon flow amount is 8L/min; In the welding process, keep 60 ° of angles between welding wire and weldment, welding wire is sent into the molten bath steadily, uniformly along the molten bath front end;
8) after welding finishes, continue logical argon shield 6min.
Resulting Ti-6Al-4V titanium alloy and 1060 pure aluminum plate 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, and the shear strength of welding point is 275.3MPa.
Embodiment 2:
1) selecting thickness is Ti-6Al-4V titanium alloy sheet and 1060 pure aluminum plates of the equal thickness of 3mm, open the groove of equidimension at the side of two plates, the angle of the V-structure that the side groove docking of two plates forms is 15 degree, then carry out surface treatment for titanium alloy sheet and pure aluminum plate part to be welded respectively, handling process is: use sand papering, and------------washing---acetone cleaning---oven dry is to remove oxide layer, impurity and the greasy dirt of plate surface in the diluted hydrofluoric acid corrosion in washing in the cleaner for metal oil removing;
2) first prepare the solution of following proportioning: 94% commercial-purity aluminium, 4% Fe and 2% Si, then titanium alloy sheet part to be welded to be carried out liquid and soak processing, the time of staying is 25 minutes, and heating-up temperature is 700 ℃, and the plating aluminum layer thickness of formation is controlled at 100 μ m;
3) to the side edge surface employing laser pre-treated of titanium alloy sheet through aluminising, adopting output wavelength is the neodymium doped yttrium aluminium garnet laser of 1064nm, the focus lamp focal length is 175mm, the absolute value of the side edge surface that laser spot is to be welded apart from titanium alloy sheet is 3.1-3.4 mm, the output continuous wave laser, pretreatment laser power 2.5 kW, sweep speed is 2 m/min, pretreated titanium alloy sheet in translation also with the direction of translation vertical on move back and forth, rate travel is 1.5m/min;
4) adopting diameter is the alloy welding wire of 1.2mm, and its mass percent composition is:
Magnesium: 5.78 %, silicon: 0.1 %, manganese: 0.15 %, iron: 0.35 %, carbon: 0.08 %, titanium: 0.09 %, phosphorus: 0.06 %, surplus is aluminium;
Welding wire is immersed 50%H
2O+50%HNO
3Solution rinses post-drying with clear water after 20min, then polishes with sand paper;
5) titanium alloy sheet is docked placement with pure aluminum plate in same plane, the fit-up gap at narrow place is 0.1mm;
6) first butt-welding fitting just, the back side logical argon shield 8min simultaneously, protective gas is purity greater than 99.98% argon gas;
7) adopt the TIG welding that fills silk to carry out the tungsten electrode welding, argon arc welding adopts tungsten-thorium electrode, and the content of tungsten is 99.9%, tungsten electrode diameter 2.5mm, and the end is taper; Technological parameter is: weldingvoltage 12V, and welding current 90A, speed of welding is 70mm/min, argon flow amount is 9L/min; In the welding process, keep 60 ° of angles between welding wire and weldment, welding wire is sent into the molten bath steadily, uniformly along the molten bath front end;
8) after welding finishes, continue logical argon shield 8min.
Resulting Ti-6Al-4V titanium alloy and 1060 pure aluminum plate 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, and the shear strength of welding point is 283 .6MPa.
Embodiment 3:
1) select thickness be 3.5mm equal thickness Ti-6Al-4V titanium alloy sheet and 1060 pure aluminum plates, open the groove of equidimension at the side of two plates, the angle of the V-structure that the side groove docking of two plates forms is 10 degree, then carry out surface treatment for titanium alloy sheet and pure aluminum plate part to be welded respectively, handling process is: use sand papering, and------------washing---acetone cleaning---oven dry is to remove oxide layer, impurity and the greasy dirt of plate surface in the diluted hydrofluoric acid corrosion in washing in the cleaner for metal oil removing;
2) first prepare the solution of following proportioning: 94% commercial-purity aluminium, 4% Fe and 2%Si, then titanium alloy sheet part to be welded to be carried out liquid and soak processing, the time of staying is 28 minutes, and heating-up temperature is 720 ℃, and the plating aluminum layer thickness of formation is controlled at 130 μ m;
3) to the side edge surface employing laser pre-treated of titanium alloy sheet through aluminising, adopting output wavelength is the neodymium doped yttrium aluminium garnet laser of 1064nm, the focus lamp focal length is 180mm, the absolute value of the side edge surface that laser spot is to be welded apart from titanium alloy sheet is 2.8-3 mm, the output continuous wave laser, pretreatment laser power 3 kW, sweep speed is 2.5 m/min, pretreated titanium alloy sheet in translation also with the direction of translation vertical on move back and forth, rate travel is 2 m/min;
4) adopting diameter is the alloy welding wire of 0.8mm, and its mass percent composition is:
Magnesium: 6.35 %, silicon: 0.12 %, manganese 0.2 %, iron: 0.4 %, carbon: 0.1 %, titanium: 0.15 %, phosphorus: 0.07 %, surplus is aluminium;
Welding wire is immersed 50%H
2O+50%HNO
3Solution rinses post-drying with clear water after 18min, then polishes with sand paper;
5) titanium alloy sheet is docked placement with pure aluminum plate in same plane, the fit-up gap at narrow place is 0.12mm;
6) first butt-welding fitting just, the back side logical argon shield 8-10min simultaneously, protective gas is purity greater than 99.98% argon gas;
7) adopt the TIG welding that fills silk to carry out the tungsten electrode welding, argon arc welding adopts tungsten-thorium electrode, and the content of tungsten is 99.9%, tungsten electrode diameter 2.8mm, and the end is taper; Technological parameter is: weldingvoltage 12V, and welding current 120A, speed of welding is 90 mm/min, argon flow amount is 10 L/min; In the welding process, keep 75 ° of angles between welding wire and weldment, welding wire is sent into the molten bath steadily, uniformly along the molten bath front end;
8) after welding finishes, continue logical argon shield 10min.
Resulting Ti-6Al-4V titanium alloy and 1060 pure aluminum plate 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, and the shear strength of welding point is 289.7 MPa.
Obviously, above-described embodiment is only for example clearly is described, and is not the restriction to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here need not also can't give all embodiments exhaustive.And the apparent variation of being extended out thus or the change still be in the protection domain of the invention within.
Claims (2)
1. the laser pre-treated of a titanium alloy and the pure aluminum sheets TIG welding method that fills silk, is characterized in that, comprises the following steps:
1) selecting thickness is titanium alloy sheet and the pure aluminum plate of the equal thickness of 2.5-3.5mm, open the groove of equidimension at the side of two plates, the angle of the V-structure that the side groove docking of two plates forms is the 10-20 degree, then carry out surface treatment for titanium alloy sheet and pure aluminum plate part to be welded respectively, handling process is: use sand papering, and------------washing---acetone cleaning---oven dry is to remove oxide layer, impurity and the greasy dirt of plate surface in the diluted hydrofluoric acid corrosion in washing in the cleaner for metal oil removing;
2) first prepare the solution of following proportioning: 93%-94% commercial-purity aluminium, 4% Fe and 2%-3% Si, then titanium alloy sheet part to be welded is carried out liquid and soak processing, the time of staying is 22-28 minute, and heating-up temperature is 690-720 ℃, and the plating aluminum layer thickness of formation is controlled at 80-130 μ m;
3) to the side edge surface employing laser pre-treated of titanium alloy sheet through aluminising, adopting output wavelength is the neodymium doped yttrium aluminium garnet laser of 1064nm, the focus lamp focal length is 170-180mm, the absolute value of the side edge surface that laser spot is to be welded apart from titanium alloy sheet is 2.8-3.5 mm, the output continuous wave laser, pretreatment laser power 2 ~ 3 kW, sweep speed is 1.5 ~ 2.5 m/min, pretreated titanium alloy sheet in translation also with the direction of translation vertical on move back and forth, rate travel is 1.2 ~ 2m/min;
4) adopting diameter is the alloy welding wire of 0.8-1.5mm, and its mass percent composition is:
Magnesium: 5.2-6.35%, silicon: 0.09-0.12 %, manganese: 0.12-0.2 %, iron: 0.25-0.4 %, carbon: 0.05-0.1 %, titanium: 0.05-0.15 %, phosphorus: 0.05-0.07%, surplus is aluminium;
Welding wire is immersed 50%H
2O+50%HNO
3Solution rinses post-drying with clear water after 15-20min, then polishes with sand paper;
5) titanium alloy sheet is docked placement with pure aluminum plate in same plane, the fit-up gap at narrow place is 0.1mm-0.12mm;
6) first butt-welding fitting just, the back side logical argon shield 8-10min simultaneously, protective gas is purity greater than 99.98% argon gas;
7) adopt the TIG welding that fills silk to carry out the tungsten electrode welding, argon arc welding adopts tungsten-thorium electrode, and the content of tungsten is 99.9%, tungsten electrode diameter 1.8-2.8mm, and the end is taper; Technological parameter is: weldingvoltage 12V, and welding current 80-120A, speed of welding is 60-90mm/min, argon flow amount is 8-10L/min; In the welding process, keep 60-75 ° of angle between welding wire and weldment, welding wire is sent into the molten bath steadily, uniformly along the molten bath front end;
8) after welding finishes, continue logical argon shield 6-10min.
2. the laser pre-treated of titanium alloy according to claim 1 and the pure aluminum sheets TIG welding method that fills silk, is characterized in that, titanium alloy sheet docks placement in same plane with pure aluminum plate, and the fit-up gap at narrow place is 0.1mm.
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