CN107999950A - A kind of middle pressure high-velocity electron beam welding method of titanium alloy thin wall casing - Google Patents

A kind of middle pressure high-velocity electron beam welding method of titanium alloy thin wall casing Download PDF

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Publication number
CN107999950A
CN107999950A CN201711272526.5A CN201711272526A CN107999950A CN 107999950 A CN107999950 A CN 107999950A CN 201711272526 A CN201711272526 A CN 201711272526A CN 107999950 A CN107999950 A CN 107999950A
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Prior art keywords
welding
constant
electron
casing
titanium alloy
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CN201711272526.5A
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CN107999950B (en
Inventor
葛沁
曲伸
赵飞
倪建成
李英
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AECC Shenyang Liming Aero Engine Co Ltd
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AECC Shenyang Liming Aero Engine Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K15/00Electron-beam welding or cutting
    • B23K15/06Electron-beam welding or cutting within a vacuum chamber
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K15/00Electron-beam welding or cutting
    • B23K15/0006Electron-beam welding or cutting specially adapted for particular articles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K15/00Electron-beam welding or cutting
    • B23K15/0033Preliminary treatment
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K15/00Electron-beam welding or cutting
    • B23K15/0046Welding
    • B23K15/0053Seam welding

Abstract

A kind of middle pressure high-velocity electron beam welding method of titanium alloy thin wall casing, step are as follows:Welding pre-treatment is carried out to part to be welded, ensures cleannes, and ensures that fit-up gap and dislocation are less than 0.05mm;Titanium alloy thin wall casing is assembled on welding fixture and is vacuumized;After carrying out tack welding to weld seam, electron beam welding is carried out, completes the welding of weld seam, welding parameter is:Accelerating potential 110KV, 30~22mm/s of speed of welding;13~18mA of welding current, electron beam scanning parameter are:Sweep waveform is to justify ripple, 1.2~0.8mm of amplitude, frequency 100Hz;48~90J/mm of heat input ratio;After the completion of welding, weldquality is checked, the test mode includes visual, X-ray and fluoroscopy.Welding method using the present invention forms appearance of weld stability and quality significantly improves, and thermal weld stress reduces by 20~30%, and welding deformation is effectively controlled, weld seam frontal width, and back side width disclosure satisfy that design requirement with root reinforcement.

Description

A kind of middle pressure high-velocity electron beam welding method of titanium alloy thin wall casing
Technical field:
The invention belongs to hardware welding technology field, and in particular to a kind of middle pressure of titanium alloy thin wall casing is electric at a high speed Beamlet welding method.
Background technology:
Welding deformation, Varying-thickness appearance of weld stability and the reverse side of titanium alloy thin wall casing fly in aero-engine manufacture Splash thing control to fail thoroughly to solve all the time, from the point of view of the characteristics of thin walled welds casing manufactures, influence factor is more, reason is multiple It is miscellaneous.Main influence factor has:Dimensional accuracy and assembling quality, welding procedure reasonability, material weldability before part welding Influenced with subsequent technique (heat treatment) and integrated artistic Vehicle routing etc..Welding deformation is to influence thin wall component quality and life One of principal element of efficiency is produced, the presence of welding deformation not only influences the manufacturing process of product, it is often more important that also influence production The performance of product.The basic factor for producing part welding deformation is that non-uniform heating and cooling procedure cause in welding process Temperature stress and material structure transformation (phase transformation) caused by structural stress, and postwelding residual stress can also finally process part The fatigue strength of precision and dimensional stability, the generation of weld defect and part produces very big adverse effect, therefore realizes Weld industry is the main technological difficulties of Thin-Wall Outer Casing class part welding, and splash can influence the surface quality of part With the workload of rear process.Solution has:Improve component assembly quality before welding, Optimal Parameters improve shaping, reduce welding Thermal deformation, control weld defect reduce repair welding number etc. caused by heat input.
The content of the invention:
The purpose of the present invention is overcome above-mentioned the shortcomings of the prior art, there is provided a kind of middle pressure of titanium alloy thin wall casing High-velocity electron beam welding method, by Optimized Matching electron beam weld parameter, improve speed of welding, improve welding process stability and Forming quality, reduces input energy level, reduces unstable heating, cooling procedure to the adverse effect of material, improves part weldering Connect problem on deformation.
To achieve the above object, the present invention uses following technical scheme:
A kind of middle pressure high-velocity electron beam welding method of titanium alloy thin wall casing, comprises the following steps:
Step 1, pre-welding treatment:
Welding pre-treatment is carried out to part to be welded, ensures piece surface to be welded without greasy dirt, dust and external attachment, and protect Card fit-up gap and dislocation are less than 0.05mm;
Step 2, component assembly:
Titanium alloy thin wall casing is assembled on welding fixture, and is vacuumized;
Step 3, electron beam welding:
(1) positioning of beam welds:Tack welding is carried out to weld seam using symmetrical tack welding;
(2) electron beam welding is carried out, completes the welding of weld seam, wherein, welding parameter is:Accelerating potential is 110KV, welding Speed is 30~22mm/s;Welding current is 13~18mA, and electron beam scanning parameter is:Sweep waveform is to justify ripple, amplitude 1.2 ~0.8mm, frequency 100Hz;Heat input ratio is 48~90J/mm;
Step 4, postwelding inspection:
After the completion of welding, weldquality is checked, the test mode includes visual, X-ray and fluoroscopy.
Using the welding method, the heat input of welding reduces by 20~30%.
In the step 3 (1), before positioning of beam weldering, welding parameter has been carried out according to corresponding welding parameter Verification, visually inspects weld seam, and positioning of beam weldering is carried out after meeting weldquality requirement.
In the step 3 (1), the weld seam is welds with different thickness.
In the step 3 (1), the throat depth is 2.0~5.0mm.
In the step 3 (2), welding process is:
When being soldered to the weld seam uniform thickness stage, constant speed of welding is 30mm/s or 22mm/s, and constant welding current is 13mA Or 18mA, constant scan amplitude is 1.2mm or 1.8mm, and heat input Ratio invariableness is 48J/mm or 90J/mm;
When being soldered to throat depth changes phase:
During throat depth increase, it is 22mm/s that speed of welding is constant, and it is 1.8mm that scan amplitude is constant, heat input Ratio invariableness is 90J/mm, and constant welding current is 18mA;
During throat depth reduction, it is 30mm/s that speed of welding is constant, and it is 1.2mm that scan amplitude is constant, heat input Ratio invariableness is 48J/mm, and constant welding current is 13mA.
In the step 3 (2), throat depth increase with reduce welding process in, speed of welding, scan amplitude, Heat input ratio and welding current when throat depth increases with reducing when transient change to corresponding steady state value.
Beneficial effects of the present invention:
(1) welding parameter of electron beam is more, it is interrelated closely, particularly to thin-wall titanium alloy material, except needing to meet Weld appearance forming requirements, will also control weld seam internal metallurgical quality, and the middle pressure of titanium alloy thin wall casing of the invention is electric at a high speed Beamlet welding method carries out contrast orthogonal test by welding parameters to electron beam, filters out relatively low accelerating potential, high weldering Connect the welding parameter of speed, circular scan waveform, moderate scan frequency and amplitude, the weld seam frontal width of formation, back side width Design requirement is disclosure satisfy that with root reinforcement;
(2) present invention mainly starts with from electron beam Welding, is used first completely newly on aero-engine stator casing Welding condition, joins by adjusting accelerating potential, welding current, speed of welding, electron beam scanning pattern, frequency and amplitude etc. Number, realizes that high speed and precision not weld by equal thickness, makes speed of welding be enhanced about more than once;
(3) the middle pressure high-velocity electron beam welding method of titanium alloy thin wall casing using the present invention so that weld seam is particularly The shape stability and quality of thin and thick changeover portion significantly improve, and reverse side reinforcement substantially reduces, and reverse side splash significantly reduces, welding Heat input reduces by 20~30%, and welding deformation is effectively controlled, and makes the circularity of stator casing, straightness, radial contraction amount, leaf Ten significant dimensions precision such as piece angular position, blade height difference are respectively increased 10~80%, and a solder yield is from 50% Bring up to current more than 95%.
Brief description of the drawings:
Fig. 1 is electron beam weld metallograph, wherein:
(a) it is the weld seam metallograph of prior art mesohigh low speed welding;
(b) it is that the weld seam metallograph that high-speed welding is formed is pressed in the embodiment of the present invention 1;
Fig. 2 is the titanium alloy thin wall casing schematic diagram of the embodiment of the present invention 1;
Fig. 3 is the weld joint schematic diagram that the embodiment of the present invention 1 is formed;
Fig. 4 is the weld seam material object schematic diagram that the embodiment of the present invention 1 is formed.
Embodiment:
With reference to embodiment, the present invention is described in further detail.
Embodiment 1
A kind of middle pressure high-velocity electron beam welding method of titanium alloy thin wall casing, comprises the following steps:
Step 1, pre-welding treatment:
Welding pre-treatment is carried out to part to be welded, ensures piece surface to be welded without greasy dirt, dust and external attachment, and protect Card fit-up gap and dislocation are less than 0.05mm;
Step 2, component assembly:
Titanium alloy thin wall casing is assembled on welding fixture, and is vacuumized, titanium alloy thin wall casing schematic diagram is such as Shown in Fig. 2;
Step 3, electron beam welding:
(1) positioning of beam welds:Welding parameter verification has been carried out according to corresponding welding parameter, has visually inspected weld seam, it is full Tack welding is carried out to more than 100 bar weld seams on part using symmetrical tack welding after sufficient weldquality requirement, the throat depth is 2.0~5.0mm;
(2) electron beam welding is carried out, completes the welding of weld seam, wherein, welding parameter is:Accelerating potential is 110KV, is focused on Electric current is 1880mA, and speed of welding is 30~22mm/s;Welding current is 13~18mA, and electron beam scanning parameter is:Scan ripple Shape is circle ripple, and amplitude is 1.2~0.8mm, frequency 100Hz;Heat input ratio is 48~90J/mm, part welding parameter such as table Shown in 1;
It is 2.0mm when being soldered to throat depth, constant speed of welding is 30mm/s, and constant welding current is 13mA, scanning Constant amplitude is 1.2mm, and heat input Ratio invariableness is 48J/mm;
It is 5.0mm when being soldered to throat depth, constant speed of welding is 22mm/s, and constant welding current is 18mA, scanning Constant amplitude is 1.8mm, and heat input Ratio invariableness is 90J/mm;
During throat depth increases from 2.0mm to 5.0mm, constant speed of welding is 22mm/s, and scan amplitude is constant For 1.8mm, heat input Ratio invariableness is 90J/mm, and constant welding current is 18mA, wherein speed of welding, scan amplitude, line energy Measure ratio and welding current when throat depth increases transient change to corresponding steady state value;
During throat depth reduces from 5.0mm to 2.0mm, constant speed of welding is 30mm/s, and scan amplitude is constant For 1.2mm, heat input Ratio invariableness is 48J/mm, and constant welding current is 13mA, wherein speed of welding, scan amplitude, line energy Measure ratio and welding current when throat depth reduces transient change to corresponding steady state value;
Step 4, postwelding inspection:
After the completion of welding, using visual, the mode of X-ray and fluoroscopy, weldquality, the weld seam metallograph are checked As shown in Fig. 1 (b), weld joint schematic diagram as shown in figure 3, weld seam material object schematic diagram as shown in figure 4, weld seam frontal width exists 2.2mm~2.4mm, back side width meet design requirement, weldquality reaches in 1.3mm~1.5mm, root reinforcement 0.1mm II class weld seam standard, the welding energy input to the present embodiment method calculate, and the calculation formula of welding energy input isBy calculating, the heat input for making welding using the welding method reduces 20~30%, is reflected in postwelding zero 10~80% are improved in part items dimensional accuracy, positive effect;The high pressure low speed generally used in the prior art welds to be formed Weld seam metallograph such as Fig. 1 (a) shown in, since speed is relatively low, the liquid state molten pool survival time length, under the effect of gravity, weld seam goes out Existing fusion area sinks, the increased phenomenon of reverse side reinforcement.
High-velocity electron beam welding parameter is pressed in table 1

Claims (4)

1. the middle pressure high-velocity electron beam welding method of a kind of titanium alloy thin wall casing, it is characterised in that comprise the following steps:
Step 1, pre-welding treatment:
Welding pre-treatment is carried out to part to be welded, ensures piece surface to be welded without greasy dirt, dust and external attachment, and ensure to fill It is less than 0.05mm with gap and dislocation;
Step 2, component assembly:
Titanium alloy thin wall casing is assembled on welding fixture, and is vacuumized;
Step 3, electron beam welding:
(1) positioning of beam welds:Tack welding is carried out to weld seam using symmetrical tack welding;
(2) electron beam welding is carried out, completes the welding of weld seam, wherein, welding parameter is:Accelerating potential is 110KV, speed of welding For 30~22mm/s;Welding current is 13~18mA, and electron beam scanning parameter is:Sweep waveform is circle ripple, amplitude for 1.2~ 0.8mm, frequency 100Hz;Heat input ratio is 48~90J/mm;
Step 4, postwelding inspection:
After the completion of welding, weldquality is checked, the test mode includes visual, X-ray and fluoroscopy.
2. the middle pressure high-velocity electron beam welding method of titanium alloy thin wall casing according to claim 1, it is characterised in that institute In the step 3 (1) stated, before positioning of beam weldering, welding parameter verification is carried out according to corresponding welding parameter, visually inspection Weld seam is looked into, positioning of beam weldering is carried out after meeting weldquality requirement.
3. the middle pressure high-velocity electron beam welding method of titanium alloy thin wall casing according to claim 1, it is characterised in that institute In the step 3 (1) stated, the weld seam is welds with different thickness.
4. the middle pressure high-velocity electron beam welding method of titanium alloy thin wall casing according to claim 3, it is characterised in that institute In the step 3 (2) stated, welding process is:
When being soldered to the weld seam uniform thickness stage, it is 30mm/s or 22mm/s that speed of welding is constant, welding current it is constant for 13mA or 18mA, constant scan amplitude is 1.2mm or 1.8mm, and heat input Ratio invariableness is 48J/mm or 90J/mm;
When being soldered to throat depth changes phase:
During throat depth increase, it is 22mm/s that speed of welding is constant, and it is 1.8mm that scan amplitude is constant, heat input ratio Constant is 90J/mm, and constant welding current is 18mA;
During throat depth reduction, it is 30mm/s that speed of welding is constant, and it is 1.2mm that scan amplitude is constant, heat input ratio Constant is 48J/mm, and constant welding current is 13mA.
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108581167A (en) * 2018-06-27 2018-09-28 西安飞机工业(集团)有限责任公司 A kind of asymmetric fusion penetration double-side electronic beam soldering method of big thickness titanium alloy sheet
CN109664014A (en) * 2018-12-17 2019-04-23 中国航发动力股份有限公司 A kind of process reducing the deformation of shell part electron beam welding
CN110238612A (en) * 2019-06-03 2019-09-17 中国兵器科学研究院宁波分院 A kind of welding titanium alloy profile and preparation method thereof
CN110732795A (en) * 2019-11-19 2020-01-31 中国航发贵州黎阳航空动力有限公司 aircraft engine exhaust casing welding method
CN110977170A (en) * 2019-11-25 2020-04-10 中国航发沈阳黎明航空发动机有限责任公司 Electron beam welding method for thin-wall casing gas-collecting hood structure
CN111702317A (en) * 2020-06-30 2020-09-25 中国航发动力股份有限公司 Electron beam welding method for double-sided planet weld joint structure
CN112077440A (en) * 2020-07-31 2020-12-15 北京航星机器制造有限公司 Welding method of thin-wall titanium alloy spherical component

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CN106862746A (en) * 2017-03-08 2017-06-20 西北工业大学 A kind of high-temperature titanium alloy thin-section casting electro-beam welding method
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JPH04274888A (en) * 1991-02-28 1992-09-30 Kobe Steel Ltd Jointing method of sheet
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108581167A (en) * 2018-06-27 2018-09-28 西安飞机工业(集团)有限责任公司 A kind of asymmetric fusion penetration double-side electronic beam soldering method of big thickness titanium alloy sheet
CN109664014A (en) * 2018-12-17 2019-04-23 中国航发动力股份有限公司 A kind of process reducing the deformation of shell part electron beam welding
CN110238612A (en) * 2019-06-03 2019-09-17 中国兵器科学研究院宁波分院 A kind of welding titanium alloy profile and preparation method thereof
CN110732795A (en) * 2019-11-19 2020-01-31 中国航发贵州黎阳航空动力有限公司 aircraft engine exhaust casing welding method
CN110732795B (en) * 2019-11-19 2021-04-06 中国航发贵州黎阳航空动力有限公司 Welding method for aero-engine exhaust casing
CN110977170A (en) * 2019-11-25 2020-04-10 中国航发沈阳黎明航空发动机有限责任公司 Electron beam welding method for thin-wall casing gas-collecting hood structure
CN110977170B (en) * 2019-11-25 2021-05-18 中国航发沈阳黎明航空发动机有限责任公司 Electron beam welding method for thin-wall casing gas-collecting hood structure
CN111702317A (en) * 2020-06-30 2020-09-25 中国航发动力股份有限公司 Electron beam welding method for double-sided planet weld joint structure
CN112077440A (en) * 2020-07-31 2020-12-15 北京航星机器制造有限公司 Welding method of thin-wall titanium alloy spherical component

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