CN108436269A - A kind of excellent steel of elevated temperature strength-niobium connection method - Google Patents
A kind of excellent steel of elevated temperature strength-niobium connection method Download PDFInfo
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- CN108436269A CN108436269A CN201810177287.3A CN201810177287A CN108436269A CN 108436269 A CN108436269 A CN 108436269A CN 201810177287 A CN201810177287 A CN 201810177287A CN 108436269 A CN108436269 A CN 108436269A
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- Prior art keywords
- niobium
- steel
- welding
- elevated temperature
- temperature strength
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Classifications
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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
- B23K26/24—Seam welding
- B23K26/26—Seam welding of rectilinear seams
-
- 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
Abstract
A kind of steel niobium connection method that elevated temperature strength is excellent can not be applied to hot environment for solving the problem of that existing steel niobium welding method connector elevated temperature strength is low.Middle layer is preset between steel plate and niobium plate first, forms part to be welded；Then it is welded using two pass Welding：First of laser beam acts at steel copper interface；Second laser beam acts at niobium copper interface；Welding for the first time is 0.5~2min with second of welding interval, wherein the middle layer is copper or aluminium copper-nickel alloy.It is betided at niobium base material using the method postwelding high temperature tension test display fracture of the present invention, shows that the elevated temperature strength of weld seam is higher than the elevated temperature strength of niobium base material.The manufacture for the steel niobium composite component that the present invention is suitable for working in the high temperature environment.
Description
Technical field
The invention belongs to different-metal material welding fields, and in particular to a kind of realization of steel-niobium laser welded seam second-phase strength
Method.This application claims Chinese patents filed in 4 days Mays in 2017 of applicant《A kind of high strength steel-niobium connection method》's
Priority, application No. is 2017103109885, and its full text is introduced into this patent.
Background technology
Steel-niobium composite welding structure can improve aero-engine operating temperature, mitigate its weight, make aeroplane engine equipment
There is higher thrust-weight ratio, has broad application prospects in aerospace field.But due to the thermophysical property of steel and niobium and
Metallurgical performance very different causes steel-niobium strength of welded joint, especially elevated temperature strength extremely low, or even generates and split in postwelding
Line.Therefore it is to promote steel-niobium composite welding structure in aerospace industry to obtain the excellent steel-niobium welding point of elevated temperature strength
The critical process link of popularization and application.Solving the problems, such as this rational method both at home and abroad at present, there is not been reported.
Laser Welding has the characteristics that small heat input, welding energy and heating location controllable precise, is current welding of dissimilar metal
One of main method connect.Therefore this patent will use Laser Welding welding steel and niobium, by preset aluminium copper-nickel alloy middle layer to weld seam
Tissue carries out metallurgical regulation and control, the hardening constituent of Precipitation disperse from supersaturated solid solution, to which the heat for significantly improving connector is strong
Property, the excellent steel-niobium laser weld joint of elevated temperature strength is obtained, promotes steel-niobium composite welding structure in aerospace industry
Popularization and application.
Invention content
The purpose of the present invention is to solve existing steel-low problems of niobium welding point elevated temperature strength, provide a kind of high temperature
The steel of good strength-niobium connection method.
When the thickness of stainless steel plate and niobium plate is 2mm, and the thickness of copper sheet is 1.5mm, under passing through
State step realization：
(1) stainless steel plate and niobium plate, copper sheet are first polished into surface to remove surface film oxide and oil with 80# water-proof abrasive papers
Dirt, then dip acetone and alcohol washes surface of test piece respectively with absorbent cotton, it is ensured that material surface cleaning does not pollute；
(2) copper sheet is preset in as middle layer between steel plate and niobium plate and is formed to get to by stainless steel-copper-niobium
Part to be welded；
(3) part to be welded is fixedly clamped at both ends, the gap at steel-copper, copper-niobium interface is made to be respectively less than 0.15mm.Again with pressure
Plate is pressed in part to be welded top surface edge, to prevent part to be welded from buckling deformation occurring in the welding process.Then two pass welder is used
Skill is welded：First of laser beam acts at steel-copper interface；Second laser beam acts at niobium-copper interface；Weldering
It is argon gas to connect main protection gas, and protection air-flow amount is 10L/min~13L/min, and back of the body protection gas is also argon gas, and protection air-flow amount is
8L/min~10L/min；Welding for the first time is 0.5~2min with second of welding interval；It is realized by above-mentioned steps
The second-phase strength of steel-niobium weld seam, obtains the excellent steel of elevated temperature strength-niobium welding point.
Description of the drawings
Fig. 1 is part to be welded schematic diagram；
Fig. 2 is laser beam active position schematic diagram；
Fig. 3 is the welding point fracture position of embodiment one；
Fig. 4 is the welding point fracture position of embodiment two；
Fig. 5 is the welding point fracture position of embodiment three；
Fig. 6 is the welding point fracture position of embodiment four；
Fig. 7 is the welding point fracture position of embodiment five；
Fig. 8 is the welding point fracture position of embodiment six；
1 indicates stainless steel in Fig. 1 and Fig. 2, and 2 indicate niobium, and 3 indicate copper；4 indicate first of laser beam in Fig. 2, and 5 indicate the
Two laser beams.
Specific implementation mode
The specific implementation mode of the present invention is described in detail below, but protection scope of the present invention is not limited to institute
State embodiment.
Specific implementation mode one：The welding method of present embodiment is realized according to the following steps (referring to Fig. 1, Fig. 2)：
(1) base material is Nb521 alloys and 304 stainless steels, and size is 50mm × 25mm × 2mm.Middle layer is fine copper plate, ruler
Very little is 50mm × 2mm × 1.5mm；
(2) stainless steel plate and niobium plate, copper sheet are first polished into surface to remove surface film oxide and oil with 80# water-proof abrasive papers
Dirt, then dip acetone and alcohol washes surface of test piece respectively with absorbent cotton, it is ensured that material surface cleaning does not pollute；
(3) copper sheet is preset in as middle layer between steel plate and niobium plate and is formed to get to by stainless steel-copper-niobium
Part to be welded；
(4) part to be welded is fixedly clamped at both ends, the gap at steel-copper, copper-niobium interface is made to be respectively less than 0.15mm.Again with pressure
Plate is pressed in part to be welded top surface edge, to prevent part to be welded from buckling deformation occurring in the welding process.Then two pass welder is used
Skill is welded：First welding parameter be：Laser power P=2kW, speed of welding v=1.8m/min, defocusing amount △ f=
0；Second welding parameter be：Laser power P=2kW, speed of welding v=1.8m/min, defocusing amount △ f=0；Weld main guarantor
Shield gas is argon gas, and protection air-flow amount is 10L/min, and back of the body protection gas is also argon gas, and protection air-flow amount is 8L/min；It welds for the first time
It is 1.5min with second of welding interval.It is to complete the complete solid solution of steel-niobium weld seam by above-mentioned steps, obtains
The welding point of high intensity.
Present embodiment joint breaking position is as shown in Figure 3.From figure 3, it can be seen that fracture betides at niobium base material, show
Weld strength is higher than niobium strength of parent, and present embodiment weld metal is made of solid solution.Joint breaking intensity is 275MPa.
Specific implementation mode two：The present embodiment is different from the first embodiment in that the welding speed of first of welding
Spend v=1.5m/min.It is other same as the specific embodiment one.
Present embodiment welding point fracture position is as shown in Figure 4.From fig. 4, it can be seen that fracture betides at niobium base material,
Show that weld strength is higher than niobium strength of parent, present embodiment weld metal is made of solid solution.Joint breaking intensity is
265MPa。
Specific implementation mode three：The present embodiment is different from the first embodiment in that copper intermediate layer uses tin
Bronze.It is other same as the specific embodiment one.
Present embodiment welding point fracture position is as shown in Figure 5.From fig. 5, it can be seen that fracture betides at niobium base material,
Show that weld strength is higher than niobium strength of parent, present embodiment weld metal is made of solid solution.Joint breaking intensity is
275MPa。
Specific implementation mode four：The present embodiment is different from the first embodiment in that niobium base material uses pure niobium
Plate.It is other same as the specific embodiment one.
Present embodiment joint breaking position is as shown in Figure 6.From fig. 6, it can be seen that fracture betides at niobium base material, show
Weld strength is higher than niobium strength of parent, and present embodiment weld metal is made of solid solution.Joint breaking intensity is 260MPa.
Specific implementation mode five：The welding method of present embodiment is realized according to the following steps (referring to Fig. 1, Fig. 2)：
(1) base material is Nb521 alloys and 304 stainless steels, and size is 50mm × 25mm × 2mm.Middle layer is aluminium copper-nickel alloy, ruler
Very little is 50mm × 2mm × 1.5mm；
(2) stainless steel plate and niobium plate, aluminium copper-nickel alloy piece first with 80# water-proof abrasive papers are polished into surface with remove surface film oxide and
Greasy dirt, then dip acetone and alcohol washes surface of test piece respectively with absorbent cotton, it is ensured that material surface cleaning does not pollute；
(3) copper sheet is preset in as middle layer between steel plate and niobium plate and is formed to get to by stainless steel-copper-niobium
Part to be welded；
(4) part to be welded is fixedly clamped at both ends, the gap at steel-copper, copper-niobium interface is made to be respectively less than 0.15mm.Again with pressure
Plate is pressed in part to be welded top surface edge, to prevent part to be welded from buckling deformation occurring in the welding process.Then two pass welder is used
Skill is welded：First welding parameter be：Laser power P=2kW, speed of welding v=1.8m/min, defocusing amount △ f=
0；Second welding parameter be：Laser power P=2kW, speed of welding v=1.8m/min, defocusing amount △ f=0；Weld main guarantor
Shield gas is argon gas, and protection air-flow amount is 10L/min, and back of the body protection gas is also argon gas, and protection air-flow amount is 8L/min；It welds for the first time
It is 1.5min with second of welding interval.It is to complete the second-phase strength of steel-niobium weld seam by above-mentioned steps, obtains
The excellent welding point of elevated temperature strength.
Present embodiment high temperature tension test (450 DEG C of test temperature) joint breaking position is as shown in Figure 7.It can be with from Fig. 7
Find out, fracture betides at niobium base material, shows that weld seam elevated temperature strength is higher than niobium base material elevated temperature strength, present embodiment weld metal
It is by solid solution and the reinforcing phase composition of Dispersed precipitate thereon.Joint breaking intensity is 275MPa.
Specific implementation mode six：The present embodiment is different from the first embodiment in that the welding speed of first of welding
Spend v=1.6m/min.It is other same as the specific embodiment one.
Present embodiment high temperature tension test (450 DEG C of test temperature) joint breaking position is as shown in Figure 8.It can be with from Fig. 8
Find out, fracture betides at niobium base material, shows that weld seam elevated temperature strength is higher than niobium base material elevated temperature strength, present embodiment weld metal
It is by solid solution and the reinforcing phase composition of Dispersed precipitate thereon.Joint breaking intensity is 265MPa.The present invention passes through in aluminium copper-nickel alloy
Alloying element nickel and aluminium form hardening constituent Ni extremely stable at high temperature3Al is allowed to Dispersed precipitate on Copper substrate, significantly
Improve the elevated temperature strength of connector.The display fracture of postwelding high temperature tension test betides at niobium base material, shows the elevated temperature strength of weld seam
Higher than the elevated temperature strength of niobium base material.The manufacture for steel-niobium composite component that the present invention is suitable for working in the high temperature environment.
As described above, although the present invention has been indicated and described with reference to specific preferred embodiment, must not explain
For the limitation to invention itself.It without prejudice to the spirit and scope of the invention as defined in the appended claims, can be right
Various changes can be made in the form and details for it.
Claims (5)
1. a kind of excellent steel of elevated temperature strength-niobium connection method, which is characterized in that the excellent steel-niobium of the elevated temperature strength swashs
Photocoagulation method is realized by following step：
(1) middle layer is preset between steel plate and niobium plate to get to the part to be welded being made of stainless steel-middle layer-niobium；
(2) part to be welded is fixedly clamped at both ends, the gap at steel-middle layer, middle layer-niobium interface is made to be respectively less than 0.15mm, then
It is pressed in part to be welded top surface edge with pressing plate, to prevent part to be welded from buckling deformation occurring in the welding process, is then welded；
Welding main protection gas is argon gas, and protection air-flow amount is 10L/min~13L/min, and back of the body protection gas is argon gas, and protection air-flow amount is
8L/min~10L/min.
2. a kind of excellent steel of elevated temperature strength according to claim 1-niobium connection method, which is characterized in that step (1) institute
The middle layer stated is copper, and the thickness of copper sheet is 1.5mm, and the thickness of stainless steel and niobium base material is 2mm.
3. a kind of excellent steel of elevated temperature strength according to claim 1-niobium connection method, which is characterized in that step (1) institute
The middle layer stated is aluminium copper-nickel alloy, and the thickness of copper sheet is 1.5mm, and the thickness of stainless steel and niobium base material is 2mm.
4. a kind of excellent steel of elevated temperature strength according to claim 1-niobium connection method, which is characterized in that step (2) institute
The welding procedure stated is two pass Welding：First of laser beam acts at steel-copper interface；Second laser beam acts on
At niobium-copper interface.
5. a kind of excellent steel of elevated temperature strength according to claim 4-niobium connection method, which is characterized in that first of weldering
The parameter connect is：Laser power P=2kW, speed of welding v=1.2m/min~1.8m/min, defocusing amount △ f=0；Second welds
The parameter connect is：Laser power P=2kW, speed of welding v=1.5m/min~1.8m/min, defocusing amount △ f=0.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710310988 | 2017-05-04 | ||
| CN2017103109885 | 2017-05-04 |
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| Publication Number | Publication Date |
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| CN108436269A true CN108436269A (en) | 2018-08-24 |
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ID=63193133
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201810177287.3A Pending CN108436269A (en) | 2017-05-04 | 2018-03-02 | A kind of excellent steel of elevated temperature strength-niobium connection method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110293305A (en) * | 2019-06-04 | 2019-10-01 | 南京理工大学 | A kind of invar alloy and aluminium alloy dissimilar metal electro-beam welding method |
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| CN105033459A (en) * | 2015-08-11 | 2015-11-11 | 江苏科技大学 | Intermetallic compound control method of steel/niobium laser welding joint |
| CN105855705A (en) * | 2016-06-23 | 2016-08-17 | 吉林大学 | Stainless steel-tita nium alloy different metal laser welding method |
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| CN101648315A (en) * | 2009-09-03 | 2010-02-17 | 哈尔滨工业大学 | Crack-free electronic beam welding method for titanium metal material and stainless steel |
| CN101722356A (en) * | 2009-12-29 | 2010-06-09 | 哈尔滨工业大学 | Method for controlling brittle phases of titanium and stainless steel electronic beam welding joints adopting composite intermediate layers |
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| CN105033459A (en) * | 2015-08-11 | 2015-11-11 | 江苏科技大学 | Intermetallic compound control method of steel/niobium laser welding joint |
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Application publication date: 20180824 |
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