CN104404506A - TiAl casting foundry defect laser repair welding method - Google Patents
TiAl casting foundry defect laser repair welding method Download PDFInfo
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- CN104404506A CN104404506A CN201410638446.7A CN201410638446A CN104404506A CN 104404506 A CN104404506 A CN 104404506A CN 201410638446 A CN201410638446 A CN 201410638446A CN 104404506 A CN104404506 A CN 104404506A
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- repair welding
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
- C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
- C23C24/106—Coating with metal alloys or metal elements only
Abstract
The invention belongs to the technical field of laser processing, and relates to a TiAl casting foundry defect laser repair welding method mainly used to TiAl casting foundry defect repair. According to the method, Ti2AlNb metal powder with the ductility better than that of a matrix is used as cladding material, reasonable laser cladding process parameters are used for repair of TiAl casting foundry defects (such as cracks, inclusions, shrinkages and less casting), repair parts almost are free of deformation, cracks, air holes, incomplete fusion and other defects, and a high quality repair welding joint is formed.
Description
Technical field
The invention belongs to technical field of laser processing, relate to a kind of laser welding method of TiAl cast casting defect, be mainly used in the reparation of TiAl cast casting defect.
Background technology
In order to improve the thrust-weight ratio of aircraft engine, need the gordian technique of the aspects such as the structure design of key breakthrough engine parts, material, moulding process.The loss of weight realizing engine is one of important channel of improving engine thrust-weight ratio, therefore, lightweight, high temperature material become the excellent selection of advanced aero engine, being wherein that the alloy of base has great application prospect in high-temperature structural material Application Areas with Ti-Al, is the preferred material of Some substitute superalloy.TiAl-base alloy is as the one of Ti-Al base alloy, and entered the ripe application stage at present, this alloy has lower (the about 3.8g/cm of density
3), specific tenacity and specific rigidity advantages of higher, and working temperature can reach 800 DEG C, will be used widely in high thrust-weight ratio aircraft engine.Due to the existence of the shortcomings such as the non-constant of TiAl-base alloy plasticity and toughness, shaping difficulty are large, inevitably cause its foundry goods in preparation process, occur crackle, be mingled with, the casting flaw such as shrinkage porosite, need to adopt repair welding measure rebuild part defect.Comparatively feasible repair method adopts argon arc welding at present.When adopting the direct repair welding of argon arc welding, because the input of argon arc welding heat is large, the penetration ratio of filling solder and matrix is large, and the unrelieved stress that postwelding causes is larger, repair welding position inevitably all there will be welding crack, realize successful repair welding, TiAl foundry goods must carry out weld preheating, is incubated during weldering, and preheating temperature reaches more than 800 DEG C, and need postheating (furnace cooling), require higher to preheating frock like this, high temperature when significantly welding jeopardizes welder's safety.
Summary of the invention
The object of the invention is to propose one, the unrelieved stress that postwelding causes is little, and the laser welding method of the TiAl cast casting defect of welding crack not easily appears in repair welding position.
The particular content of technical solution of the present invention is:
The step of the method is:
(1) prepare cladding material, select Ti2AlNb material as cladding material, adopt centrifugal powder process mode by the powder process of Ti2AlNb material, powdered ingredients: Ti-22Al-25Nb-0.5Mo, granularity is 150 order ~ 325 orders;
(2) repair front surface cleaning, casting flaw is removed in polishing, and visual inspection is cleaned out, and glazed surface, require that buffed surface is excessively smooth, finally clean with acetone;
(3) track type ceramic heat band is adopted, to treat that repair welding workpiece carries out overall weld preheating, preheating temperature 750 DEG C ± 50 DEG C, selects suitable heating zone and heating power according to workpiece size, even for K being placed in is treated on repair welding workpiece, for controlling and monitor temperature;
(4) laser melting coating, when repair welding position temperature reaches 750 DEG C, adopts laser to dose powder melting method and recovers the size of defective locations, and leave ≮ the process redundancy of 0.5mm.The processing parameter of laser melting coating is: laser power 450 ~ 650W, spot diameter 0.8 ~ 1.2mm, cladding speed 300 ~ 600mm/min, powder feeding rate 1.5 ~ 3.5rpm, powder feeding gas 5 ~ 10L/min, shielding gas 15 ~ 35L/min.The thickness in monolayer of laser melting coating controls between 0.3 ~ 0.5mm, adopts multilayer cladding to complete.In laser cladding process, maintain repair welding position temperature at 750 DEG C ± 50 DEG C.
(5) postheating, with asbestos by repair welding workpiece and heating zone entirety parcel, allows workpiece naturally be down to room temperature;
(6) measure after repairing, adopt vernier caliper measurement repair welding position, ensure that cladding layer leaves the ≮ process redundancy of 0.5mm;
(7) nondestructive testing, adopts fluorescent inspection method, checks laser cladding layer; Require flawless and incomplete fusion defect;
(8) polishing processing, adopt the mode of manual grinding to process repair welding region, visual inspection repair welding position flushes with surrounding matrix.
Described reparation front surface cleaning, adopts hand-held electric rifle polishing to remove casting flaw, and with wire wheel polishing by repair welding surface.
The advantage that the present invention has and beneficial effect
The present invention adopts laser melting and coating technique to carry out the repair welding of TiAl cast casting defect, laser melting coating has following advantage compared with common welding method: the energy density of laser beam is high, rate of heating is fast, less to the heat affecting of base material, the diluting effect of base material can be limited in extremely low degree, can be less than 0.1mm, the unrelieved stress that postwelding produces is little, causes the distortion of workpiece little; The thickness range of cladding layer is comparatively large, single track powder feeding cladding thickness 0.1 ~ 2.0mm; By dosing different powder, anti-corrosion, wear-resisting, heat-resisting, the antioxidant property of substrate material surface significantly can be improved.
Based on the advantage of laser melting and coating technique, the present invention in repair welding in earlier stage, adopt Ti2AlNb material as laser cladding of material, TiAl matrix has carried out laser melting coating repair welding, analyze repair welding surface of position defect situation, draw: before weldering, carry out preheating, at preheating temperature 750 DEG C, when filling Ti2AlNb material, there is not any defect comprising crackle in repair welding position.Room temperature and 750 DEG C of drawing by high temperature tests are carried out in butt junction, and intensity is respectively 372MPa (91.5% of strength of parent) and 437MPa (95.3% of strength of parent), and repair welding intensity can reach the repair welding intensity index requirement of TiAl foundry goods completely.
Therefore select Ti2AlNb as repair welding material, weld preheating 750 DEG C, adopt laser melting and coating technique to carry out the repair welding of TiAl foundry goods.This patented technology can be directly used in the development of China high thrust-weight ratio engine TiAl foundry goods (as hpc blade, whirlpool etc.), and corresponding result of study will fill the domestic gaps, for the development with high thrust-weight ratio engine provides tachnical storage.
Embodiment:
Below with reference to example, technical solution of the present invention is described in further detail:
According to foundry goods to be repaired installation position on the engine, analyze force-bearing situation and the casting flaw situation that need repair position, confirm parts material composition, manufacturing process and structure composition, clearly need the cladding material selected, by analyzing above and confirming, implement following concrete steps:
(1) prepare cladding material, select ductility to be better than the Ti2AlNb material of TiAl, adopt the powder process of centrifugal powder process mode, powdered ingredients: Ti-22Al-25Nb-0.5Mo, granularity is 150 order ~ 325 orders.
(2) front surface cleaning is repaired.The casting flaw such as adopt the polishing of hand-held electric rifle to remove crackle, to be mingled with, visual inspection is cleaned out, and uses wire wheel glazed surface, requires buffed surface excessively smooth as far as possible, finally cleans with acetone.
(3) track type ceramic heat band is adopted, from treating that repair welding workpiece carries out overall weld preheating, preheating temperature 750 DEG C ± 50 DEG C, selects suitable heating zone and heating power according to workpiece size, even for K being placed in is treated on repair welding workpiece, for controlling and monitor temperature.
(4) laser melting coating.When repair welding position temperature reaches 750 DEG C, adopt laser to dose powder melting method and recover the size of defective locations, and leave ≮ the process redundancy of 0.5mm.The processing parameter of laser melting coating is: laser power 450 ~ 650W, spot diameter 0.8 ~ 1.2mm, cladding speed 300 ~ 600mm/min, powder feeding rate 1.5 ~ 3.5rpm, powder feeding gas 5 ~ 10L/min, shielding gas 15 ~ 35L/min.The thickness in monolayer of laser melting coating controls between 0.3 ~ 0.5mm, adopts multilayer cladding to complete.In laser cladding process, maintain repair welding position temperature at 750 DEG C ± 50 DEG C.
(5) postheating.With asbestos by repair welding workpiece and heating zone entirety parcel, allow workpiece slowly be down to room temperature, prevent from cracking during rapid cooling.
(6) measure after repairing.Adopt vernier caliper measurement repair welding position, ensure that cladding layer leaves the ≮ process redundancy of 0.5mm.
(7) nondestructive testing.Adopt fluorescent inspection method, laser cladding layer is checked; Require the defects such as flawless.
(8) polishing processing.Adopt the mode of manual grinding to process repair welding region, visual inspection repair welding position flushes substantially with surrounding matrix.
Specific examples one
Laser melting coating is adopted to carry out the repair welding of TiAl test piece
Prepared by TiAl test piece defect
Test has shared 8 TiAl samples, be numbered 1# ~ 8#, be of a size of 55mm (length) × 20mm (wide) × 7mm (height), in each test piece, open the U-type groove that 20mm is long, 2mm is dark, with simulated defect along width and short transverse respectively.
Repair process and inspection
First repair welding is carried out to 1# sample, first carry out weld preheating, when preheating temperature reaches 750 DEG C, adopt the processing parameter in summary of the invention, laser melting coating is carried out to crack defect, continuous heating in welding process, maintain repair welding position temperature at 750 DEG C ± 50 DEG C; Postheating is to room temperature; Measure cladding layer size, ensure to leave ≮ the process redundancy of 0.5mm; Successively repair welding is carried out to 2# ~ 8# sample; After repair welding completes, carry out fluoroscopic examination, flawless defect; Manual grinding repair welding redundance, visual inspection is concordant with surrounding matrix, shown in concrete technology sees the following form.
Compared with prior art, adopt the TiAl test piece flawless defect of technical solution of the present invention repair welding, strength of joint meets index request, and process operation is convenient, and process stabilizing is reproducible, technology maturation.Can extensively promote.
Claims (2)
1. a laser welding method for TiAl cast casting defect, is characterized in that: the step of the method is:
(1) prepare cladding material, select Ti2AlNb material as cladding material, adopt centrifugal powder process mode by the powder process of Ti2AlNb material, powdered ingredients: Ti-22Al-25Nb-0.5Mo, granularity is 150 order ~ 325 orders;
(2) repair front surface cleaning, casting flaw is removed in polishing, and visual inspection is cleaned out, and glazed surface, require that buffed surface is excessively smooth, finally clean with acetone;
(3) track type ceramic heat band is adopted, to treat that repair welding workpiece carries out overall weld preheating, preheating temperature 750 DEG C ± 50 DEG C, selects suitable heating zone and heating power according to workpiece size, even for K being placed in is treated on repair welding workpiece, for controlling and monitor temperature;
(4) laser melting coating, the processing parameter of laser melting coating is: laser power 450 ~ 650W, spot diameter 0.8 ~ 1.2mm, cladding speed 300 ~ 600mm/min, powder feeding rate 1.5 ~ 3.5rpm, powder feeding gas 5 ~ 10L/min, shielding gas 15 ~ 35L/min; Multilayer cladding is adopted to complete, the thickness in monolayer of laser melting coating controls between 0.3 ~ 0.5mm, in laser cladding process, maintain repair welding position temperature at 750 DEG C ± 50 DEG C, when repair welding position temperature reaches 750 DEG C, laser melting coating recovers the size of defective locations, and to leave ≮ the process redundancy of 0.5mm;
(5) postheating, with asbestos by repair welding workpiece and heating zone entirety parcel, allows workpiece naturally be down to room temperature;
(6) measure after repairing, adopt vernier caliper measurement repair welding position, ensure that cladding layer leaves the ≮ process redundancy of 0.5mm;
(7) nondestructive testing, adopts fluorescent inspection method, checks laser cladding layer; Require flawless and incomplete fusion defect;
(8) polishing processing, adopt the mode of manual grinding to process repair welding region, visual inspection repair welding position flushes with surrounding matrix.
2. the laser welding method of a kind of TiAl cast casting defect according to claim 1, is characterized in that: described reparation front surface cleaning, adopts hand-held electric rifle polishing to remove casting flaw, and with wire wheel polishing by repair welding surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410638446.7A CN104404506B (en) | 2014-11-06 | A kind of laser welding method of TiAl cast casting defect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410638446.7A CN104404506B (en) | 2014-11-06 | A kind of laser welding method of TiAl cast casting defect |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104404506A true CN104404506A (en) | 2015-03-11 |
| CN104404506B CN104404506B (en) | 2017-01-04 |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105728877A (en) * | 2016-03-15 | 2016-07-06 | 西安航空制动科技有限公司 | Method for repairing torsional cylinder by laser welding |
| CN106637013A (en) * | 2016-10-28 | 2017-05-10 | 机械科学研究总院先进制造技术研究中心 | Thermal treatment method capable of enhancing high temperature strength of Ti2AlNb-based alloy |
| CN107267976A (en) * | 2017-05-22 | 2017-10-20 | 江苏大学 | A kind of laser in combination processing technology for obtaining wear-and corrosion-resistant titanium alloy workpiece |
| CN109207944A (en) * | 2017-07-06 | 2019-01-15 | 深圳先进技术研究院 | A kind of wire nipper and preparation method thereof with titanium-containing compound coating |
| CN110303280A (en) * | 2019-07-26 | 2019-10-08 | 浙江开诚机械有限公司 | Large casting defect repairs local preheating's method |
| CN110625223A (en) * | 2019-08-30 | 2019-12-31 | 中国航发北京航空材料研究院 | Argon arc welding repair method for TiAl-based casting defects |
| CN111215829A (en) * | 2020-03-27 | 2020-06-02 | 重庆工商大学 | Repair method for friction stir welding assisted laser cladding pump impeller blade |
| CN112276363A (en) * | 2020-10-16 | 2021-01-29 | 中国航发北京航空材料研究院 | Laser repairing method for leakage defect of aluminum alloy casting |
| CN112475773A (en) * | 2020-11-09 | 2021-03-12 | 安徽岩棉建材科技有限公司 | Method for repairing roller head for rock wool production |
| CN114273774A (en) * | 2021-11-10 | 2022-04-05 | 云南昆船机械制造有限公司 | Aluminum alloy casting defect laser welding repair method |
| CN114434086A (en) * | 2021-12-26 | 2022-05-06 | 国营四达机械制造公司 | Method for repairing surface cracks of titanium alloy thin-walled workpiece |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4990741A (en) * | 1990-02-06 | 1991-02-05 | Rockwell International Corporation | Method of laser welding |
| CN104005023A (en) * | 2014-06-06 | 2014-08-27 | 江苏大学 | Method for preparing Ti-Al-Nb alloy coating on titanium metal surface |
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4990741A (en) * | 1990-02-06 | 1991-02-05 | Rockwell International Corporation | Method of laser welding |
| CN104005023A (en) * | 2014-06-06 | 2014-08-27 | 江苏大学 | Method for preparing Ti-Al-Nb alloy coating on titanium metal surface |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105728877A (en) * | 2016-03-15 | 2016-07-06 | 西安航空制动科技有限公司 | Method for repairing torsional cylinder by laser welding |
| CN106637013A (en) * | 2016-10-28 | 2017-05-10 | 机械科学研究总院先进制造技术研究中心 | Thermal treatment method capable of enhancing high temperature strength of Ti2AlNb-based alloy |
| CN106637013B (en) * | 2016-10-28 | 2018-06-08 | 北京机科国创轻量化科学研究院有限公司 | A kind of heat treatment method for improving Ti2AlNb based alloy high-temperature intensity |
| CN107267976A (en) * | 2017-05-22 | 2017-10-20 | 江苏大学 | A kind of laser in combination processing technology for obtaining wear-and corrosion-resistant titanium alloy workpiece |
| CN109207944A (en) * | 2017-07-06 | 2019-01-15 | 深圳先进技术研究院 | A kind of wire nipper and preparation method thereof with titanium-containing compound coating |
| CN110303280A (en) * | 2019-07-26 | 2019-10-08 | 浙江开诚机械有限公司 | Large casting defect repairs local preheating's method |
| CN110625223A (en) * | 2019-08-30 | 2019-12-31 | 中国航发北京航空材料研究院 | Argon arc welding repair method for TiAl-based casting defects |
| CN110625223B (en) * | 2019-08-30 | 2021-05-07 | 中国航发北京航空材料研究院 | Argon arc welding repair method for TiAl-based casting defects |
| CN111215829A (en) * | 2020-03-27 | 2020-06-02 | 重庆工商大学 | Repair method for friction stir welding assisted laser cladding pump impeller blade |
| CN111215829B (en) * | 2020-03-27 | 2022-02-11 | 重庆工商大学 | Repair method for friction stir welding assisted laser cladding pump impeller blade |
| CN112276363A (en) * | 2020-10-16 | 2021-01-29 | 中国航发北京航空材料研究院 | Laser repairing method for leakage defect of aluminum alloy casting |
| CN112475773A (en) * | 2020-11-09 | 2021-03-12 | 安徽岩棉建材科技有限公司 | Method for repairing roller head for rock wool production |
| CN114273774A (en) * | 2021-11-10 | 2022-04-05 | 云南昆船机械制造有限公司 | Aluminum alloy casting defect laser welding repair method |
| CN114273774B (en) * | 2021-11-10 | 2023-05-30 | 云南昆船机械制造有限公司 | Laser welding repair method for defects of aluminum alloy castings |
| CN114434086A (en) * | 2021-12-26 | 2022-05-06 | 国营四达机械制造公司 | Method for repairing surface cracks of titanium alloy thin-walled workpiece |
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