CN107009025A - A kind of microalloying method for improving molybdenum and molybdenum alloy arc-seam weld obdurability - Google Patents
A kind of microalloying method for improving molybdenum and molybdenum alloy arc-seam weld obdurability Download PDFInfo
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- CN107009025A CN107009025A CN201710283455.2A CN201710283455A CN107009025A CN 107009025 A CN107009025 A CN 107009025A CN 201710283455 A CN201710283455 A CN 201710283455A CN 107009025 A CN107009025 A CN 107009025A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K10/00—Welding or cutting by means of a plasma
- B23K10/02—Plasma welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K15/00—Electron-beam welding or cutting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/346—Working by laser beam, e.g. welding, cutting or boring in combination with welding or cutting covered by groups B23K5/00 - B23K25/00, e.g. in combination with resistance welding
- B23K26/348—Working by laser beam, e.g. welding, cutting or boring in combination with welding or cutting covered by groups B23K5/00 - B23K25/00, e.g. in combination with resistance welding in combination with arc heating, e.g. TIG [tungsten inert gas], MIG [metal inert gas] or plasma welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/60—Preliminary treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
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- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Arc Welding In General (AREA)
- Laser Beam Processing (AREA)
- Welding Or Cutting Using Electron Beams (AREA)
Abstract
The invention discloses a kind of microalloying method for improving molybdenum and molybdenum alloy arc-seam weld obdurability, comprise the following steps：1) the region surface to be welded pretreatment in welding workpiece is treated, wherein, the material of workpiece to be welded is molybdenum or molybdenum alloy；2) titanium layer is filled in the joint of workpiece to be welded；3) workpiece to be welded is placed into inert gas shielding atmosphere or in vacuum environment, and treats the welding region of welding workpiece and preheated；4) welding of workpiece to be welded is completed, the welded seam area of welded workpiece is incubated again, it is subsequently cooled to room temperature, complete the microalloying to workpiece arc-seam weld, this method can eliminate impurity element the problem of grain boundaries segregation, and the obdurability of molybdenum and molybdenum alloy arc-seam weld significantly improves.
Description
Technical field
The invention belongs to welding technology field, it is related to a kind of microalloying for improving molybdenum and molybdenum alloy arc-seam weld obdurability
Method.
Background technology
Molybdenum, fusing point is up to 2610 DEG C, and neutron absorption cross-section is small, and thermal coefficient of expansion is low, and heat-conductive characteristic is excellent, high-temperature mechanics
Performance is good, and machinability is good, and when temperature is less than 500 DEG C, molybdenum has good stability in air or water.Above-mentioned advantage causes
Molybdenum has important application in fields such as metallurgy, Aeronautics and Astronautics, nuclear energy, military affairs.However, molybdenum and molybdenum alloy are substantially hard crisp materials
Material, weldability extreme difference.Because the fusing point of molybdenum is too high, typically must process preparation by the way of powder metallurgy, material air content compared with
It is high；Meanwhile, molybdenum is very sensitive to impurity such as O, N, C at high temperature, when particularly being solidified in fusion welding molten bath, the impurity such as O, N, C
Element makes grain-boundary weakness, the bond strength extreme difference of weld seam easily in grain boundaries segregation.Above mentioned problem seriously constrains molybdenum and molybdenum alloy
Application in structural material field.
The content of the invention
It is an object of the invention to solve, problems faced improves molybdenum there is provided one kind in molybdenum and molybdenum alloy welding and molybdenum is closed
The microalloying method of golden arc-seam weld obdurability, this method can eliminate impurity element the problem of grain boundaries segregation, molybdenum and
The bond strength of molybdenum alloy arc-seam weld is preferable.
To reach above-mentioned purpose, the microalloying method of raising molybdenum and molybdenum alloy arc-seam weld obdurability of the present invention
Comprise the following steps：
1) the region surface to be welded pretreatment in welding workpiece is treated, wherein, the material of workpiece to be welded is that molybdenum or molybdenum are closed
Gold；
2) titanium layer is filled in the joint of workpiece to be welded；
3) workpiece to be welded is placed into inert gas shielding atmosphere or in vacuum environment, and treats the weldering of welding workpiece
Region is connect to be preheated；
4) welding of workpiece to be welded is completed, then the welded seam area of welded workpiece is incubated, room is subsequently cooled to
Temperature, completes the microalloying to workpiece arc-seam weld.
Step 1) in treat in welding workpiece region surface to be welded pretreatment concrete operations be：Polish workpiece to be welded
Welding region, then treat the welding region of welding workpiece and carry out alkali cleaning, be then rinsed again with clear water, then by work to be welded
The welding region of part, which is soaked in acetone, to be cleaned by ultrasonic, and finally again dries up the welding region to be welded built together.
Step 4) in by Laser Welding, laser-arc hybrid welding process, electron beam weld, beam-plasma weldering or argon arc welding complete it is to be welded
Connect the welding of workpiece.
The material of workpiece to be welded is molybdenum, molybdenum and tungsten alloy, Mo Re alloys, TZM alloys, alloying element content are no more than
2wt% molybdenum alloy or the second phase dopant content are no more than 2wt% molybdenum alloy.
The weld seam form of workpiece is butt weld or corner connection weld seam, wherein, the fit-up gap of workpiece is less than before welding
0.02mm。
The mass percent of the titanium elements mixed in postwelding weld metal is 0.8%.
The purity of titanium is more than or equal to 99.99% in titanium layer.
Step 2) in workpiece to be welded joint fill titanium layer method for directly fill foil, sputter coating, electricity
Plating, cold spraying or laser melting coating.
Step 3) in preheating preheating temperature be 450 DEG C -550 DEG C.
Step 3) in by workpiece to be welded be placed into purity more than or equal to 99.999% argon gas in or vacuum be more than etc.
In 10-1In Pa vacuum environment.
The invention has the advantages that：
The microalloying method of raising molybdenum and molybdenum alloy arc-seam weld obdurability of the present invention leads in concrete operations
Cross the joint in workpiece to be welded and fill titanium layer, uniform grain occurs in the transition process from liquid phase to solid phase with molybdenum by titanium anti-
Should, make titanium and molybdenum infinitely dissolve, and brittle phase is not generated, and the solid solution bulk melting point of titanium and molybdenum is higher, with preferable high temperature
Mechanical property.Meanwhile, titanium has extremely strong affinity to oxygen at high temperature, can effectively eliminate impurity element in the inclined of crystal boundary
Analyse phenomenon, it is to avoid occur boundary segregation, and react the Mo of generationxTiyOzComposite oxides can be organized to weld seam to second
The effect of phase particle dispersion reinforcing, so that the bond strength of molybdenum and molybdenum alloy arc-seam weld is effectively improved, through experiment, using this
The obdurability of the joint made by flame welding of molybdenum and molybdenum alloy is significantly improved after invention, and welding point mechanical properties reach mother metal
More than the 80% of mechanical properties, and weld seam stretching fracture microscopic appearance is mainly shown as transgranular fracture.
Brief description of the drawings
Fig. 1 is Ti-Mo binary decision tree phasors；
Fig. 2 (a) is the scale diagrams of molybdenum tube in embodiment one；
Fig. 2 (b) is the scale diagrams of titanium foil in embodiment one；
Fig. 2 (c) is the middle-end plug scale diagrams of embodiment one；
Fig. 3 is welding point and seam center figure in embodiment one；
Fig. 4 be embodiment one in molybdenum tube mother metal, be not added with Ti joints with plus Ti bond pull curve maps；
Fig. 5 be embodiment one in be not added with molybdenum alloy laser welding head stretching fracture microstructure figure during Ti；
Molybdenum alloy laser welding head stretching fracture microstructure figure Fig. 6 is adds Ti in embodiment one when.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings：
The microalloying method of raising molybdenum and molybdenum alloy arc-seam weld obdurability of the present invention comprises the following steps：
1) the region surface to be welded pretreatment in welding workpiece is treated, wherein, the material of workpiece to be welded is that molybdenum or molybdenum are closed
Gold；
2) titanium layer is filled in the joint of workpiece to be welded；
3) workpiece to be welded is placed into inert gas shielding atmosphere or in vacuum environment, and treats the weldering of welding workpiece
Region is connect to be preheated；
4) welding of workpiece to be welded is completed, then the welded seam area of welded workpiece is incubated, room is subsequently cooled to
Temperature, completes the microalloying to workpiece arc-seam weld.
Step 1) in treat in welding workpiece region surface to be welded pretreatment concrete operations be：Polish workpiece to be welded
Welding region, then treat the welding region of welding workpiece and carry out alkali cleaning, be then rinsed again with clear water, then by work to be welded
The welding region of part, which is soaked in acetone, to be cleaned by ultrasonic, and finally again dries up the welding region of workpiece to be welded.
Step 4) in by Laser Welding, laser-arc hybrid welding process, electron beam weld, beam-plasma weldering or argon arc welding complete it is to be welded
Connect the welding of workpiece.
The material of workpiece to be welded is pure molybdenum, molybdenum and tungsten alloy, Mo Re alloys, TZM alloys, alloying element content are no more than
2wt% molybdenum alloy or the second phase dopant content are no more than 2wt% molybdenum alloy.
The weld seam form of workpiece is butt weld or corner connection weld seam, wherein, the fit-up gap of workpiece is less than before welding
0.02mm。
The mass percent of the titanium elements mixed in postwelding weld metal is 0.8%.
The purity of titanium is more than or equal to 99.99% in titanium layer.
By directly filling foil, sputtering film coating method, electro-plating method, cold spray-coating method or laser cladding method to be welded
Connect the joint filling titanium layer of workpiece.
Step 3) in preheating preheating temperature be 450 DEG C -550 DEG C.
Step 3) in by workpiece to be welded be placed into purity more than or equal to 99.999% argon gas in or vacuum be more than etc.
In 10-1In Pa vacuum environment.
Embodiment one
With containing 0.25wt%La2O3Exemplified by the docking laser weldering of high-performance molybdenum alloy thin-wall pipe-end plug of dispersion-strengtherning phase,
Shown in its size such as Fig. 2 (a), Fig. 2 (b) and Fig. 2 (c), wherein, the unit respectively marked in Fig. 2 (a), Fig. 2 (b) and Fig. 2 (c) is equal
For mm；The primary operational flow of welding is：1) molybdenum tube and end plug are docked into region and uses 240# sand paper, 600# sand paper, 1000# successively
Sand paper is polished, and is then carried out alkali cleaning with dilute sodium hydroxide aqueous solution, is finally cleaned by ultrasonic with acetone, is dried up standby；2) will
It is the annular gasket that 10mm, internal diameter are 8.5mm that the TA1 titanium foils that thickness is 0.05mm, which are processed into external diameter, then with the HNO by 12mL3、
6mL HF and 82mL H2The solution that O is formulated carries out pickling to remove titanium foil surface film oxide, finally clear with acetone ultrasound
Wash, dry up standby；3) molybdenum tube and end plug are assembled, titanium foil annular gasket is filled in both seam crossings, it is ensured that three fills
With close；4) sample to be welded assembled is placed in high-purity argon gas protective atmosphere, then butt joint is preheated, work as joint
Temperature reaches after 500 DEG C that power is irradiated in into molybdenum tube for 1200kW laser beam is filled with the seam crossing of titanium foil with end plug, and will
Sample is rotated a circle with 0.2m/min linear velocity, the Laser Welding boxing to molybdenum tube and end plug is completed, by the welding point of postwelding
30s is incubated more than 500 DEG C, is then slowly cooled to room temperature again, sample seam center is as shown in Figure 3.
A molybdenum tube is welded according to above-mentioned steps and end plug joint is not added with the sample of titanium foil as control；To high-performance molybdenum
Alloy thin-wall pipe mother metal, be not added with titanium foil and add titanium foil two kinds of high-performance molybdenum Alloy by Laser Welding banjo fixing butt jointings stretched, stretching
Curve is as shown in figure 4, the tensile strength of molybdenum tube mother metal is 720MPa, and elongation reaches 10.6mm during fracture；It is not added with titanium foil welding
The tensile strength of joint is only 124MPa, and elongation is only 0.6mm during fracture；Plus the tensile strength of titanium foil welding point is
606MPa, reaches the 84.2% of mother metal tensile strength, and plasticity and toughness significantly improve compared to when being not added with titanium foil during stretching, fracture
When elongation be 3.1mm.Such as Fig. 5 and Fig. 6, the fracture mode of joint is mainly shown as grain boundary fracture when being not added with titanium foil, and adds titanium
The fracture mode of joint is mainly shown as transcrystalline cleavage fracture during paper tinsel, therefore the present invention can significantly improve its laser welding head
Toughness, improves the tensile strength of joint.
Claims (10)
1. a kind of microalloying method for improving molybdenum and molybdenum alloy arc-seam weld obdurability, it is characterised in that comprise the following steps：
1) region surface to be welded treated in welding workpiece is pre-processed, wherein, the material of workpiece to be welded is that molybdenum or molybdenum are closed
Gold；
2) titanium layer is filled in the joint of workpiece to be welded；
3) workpiece to be welded is placed into inert gas shielding atmosphere or in vacuum environment, and treats the weld zone of welding workpiece
Domain is preheated；
4) welding of workpiece to be welded is completed, then the welded seam area of welded workpiece is incubated, room temperature is subsequently cooled to, it is complete
The microalloying of paired workpiece arc-seam weld.
2. the microalloying method according to claim 1 for improving molybdenum and molybdenum alloy arc-seam weld obdurability, its feature exists
In step 1) in treat in welding workpiece region surface to be welded pretreatment concrete operations be：Polish the weldering of workpiece to be welded
Connect region, then treat the welding region of welding workpiece and carry out alkali cleaning, be then rinsed again with clear water, then by workpiece to be welded
Welding region, which is soaked in acetone, to be cleaned by ultrasonic, and finally again dries up the welding region of workpiece to be welded.
3. the microalloying method according to claim 1 for improving molybdenum and molybdenum alloy arc-seam weld obdurability, its feature exists
In step 4) in pass through that Laser Welding, laser-arc hybrid welding process, electron beam are welded, beam-plasma weldering or argon arc welding complete work to be welded
The welding of part.
4. the microalloying method according to claim 1 for improving molybdenum and molybdenum alloy arc-seam weld obdurability, its feature exists
In the material of, workpiece to be welded be pure molybdenum, molybdenum and tungsten alloy, Mo Re alloys, TZM alloys, alloying element content be no more than 2wt%
Molybdenum alloy or the second phase dopant content are no more than 2wt% molybdenum alloy.
5. the microalloying method according to claim 1 for improving molybdenum and molybdenum alloy arc-seam weld obdurability, its feature exists
In the weld seam form of, workpiece be butt weld or corner connection weld seam, wherein, the fit-up gap of workpiece is less than 0.02mm before welding.
6. the microalloying method according to claim 1 for improving molybdenum and molybdenum alloy arc-seam weld obdurability, its feature exists
In the mass percent of the titanium elements mixed in postwelding weld metal is 0.8%.
7. the microalloying method according to claim 1 for improving molybdenum and molybdenum alloy arc-seam weld obdurability, its feature exists
In the purity of titanium is more than or equal to 99.99% in titanium layer.
8. the microalloying method according to claim 1 for improving molybdenum and molybdenum alloy arc-seam weld obdurability, its feature exists
In step 2) in the method for titanium layer is filled in the joint of workpiece to be welded directly to fill foil, it is sputter coating, plating, cold
Spraying or laser melting coating.
9. the microalloying method according to claim 1 for improving molybdenum and molybdenum alloy arc-seam weld obdurability, its feature exists
In step 3) in preheating preheating temperature be 450 DEG C -550 DEG C.
10. the microalloying method according to claim 1 for improving molybdenum and molybdenum alloy arc-seam weld obdurability, its feature exists
In step 3) in by workpiece to be welded be placed into purity more than or equal to 99.999% argon gas in or vacuum be more than or equal to 10- 1In Pa vacuum environment.
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| CN107931806A (en) * | 2017-12-26 | 2018-04-20 | 山东建筑大学 | A kind of Mo Re alloys foil micro-plasma arc welding connects method |
| CN108015445A (en) * | 2017-12-06 | 2018-05-11 | 中广核研究院有限公司 | Microalloying connection method and microalloying connection structure |
| CN109101782A (en) * | 2018-09-07 | 2018-12-28 | 山东大学 | A method of predicting Cu-Zr amorphous alloy crisp transition parameters f by force |
| CN109943802A (en) * | 2019-04-22 | 2019-06-28 | 西安交通大学 | The method for improving molybdenum and molybdenum alloy fusion welding seam intensity by pack carburizing mode |
| CN110125526A (en) * | 2019-04-26 | 2019-08-16 | 西安交通大学 | A kind of eyelet pointing titanium valve electric resistance welding method of molybdenum strainer laminated construction |
| CN110340505A (en) * | 2019-06-25 | 2019-10-18 | 西安交通大学 | A kind of Mo alloy lap joint electric resistance welding method adding titanium foil |
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| CN112222614A (en) * | 2020-08-27 | 2021-01-15 | 西安交通大学 | Method for improving molybdenum and molybdenum alloy laser welding head in nitrogen alloying mode |
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| 朱向炜: "Ti、Zr元素对钼合金组织和性能的影响", 《中国优秀硕士学位论文全文数据库 工程科技I辑》 * |
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