CN109570762A - A kind of niti-shaped memorial alloy and the connection method of stainless steel dissimilar welded joint - Google Patents
A kind of niti-shaped memorial alloy and the connection method of stainless steel dissimilar welded joint Download PDFInfo
- Publication number
- CN109570762A CN109570762A CN201811629364.0A CN201811629364A CN109570762A CN 109570762 A CN109570762 A CN 109570762A CN 201811629364 A CN201811629364 A CN 201811629364A CN 109570762 A CN109570762 A CN 109570762A
- Authority
- CN
- China
- Prior art keywords
- interface
- welding
- niti
- stainless steel
- metal layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
-
- 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
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/005—Soldering by means of radiant energy
- B23K1/0056—Soldering by means of radiant energy soldering by means of beams, e.g. lasers, E.B.
-
- 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
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/14—Soldering, e.g. brazing, or unsoldering specially adapted for soldering 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
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/19—Soldering, e.g. brazing, or unsoldering taking account of the properties of the materials to be soldered
-
- 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
- B23K26/14—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor
-
- 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
- B23K26/211—Bonding by welding with interposition of special material to facilitate connection of the parts
-
- 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
- B23K26/32—Bonding taking account of the properties of the material involved
-
- 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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/32—Selection of soldering or welding materials proper with the principal constituent melting at more than 1550 degrees C
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mechanical Engineering (AREA)
- Plasma & Fusion (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Laser Beam Processing (AREA)
- Arc Welding In General (AREA)
Abstract
The invention discloses a kind of niti-shaped memorial alloys and the connection method of stainless steel dissimilar welded joint, belong to metal material interface welding procedure field.The niti-shaped memorial alloy and stainless steel dissimilar welded joint connection method are that V metal layer and two layers of middle layer solder of Nb metal layer are added between niti-shaped memorial alloy and stainless steel, wherein stainless steel and V metal layer combination interface are interface 1, V metal layer and Nb metal layer combination interface are interface 2, Nb metal layer and niti-shaped memorial alloy combination interface are interface 3, when welding for the first time, welding heat source focus is located on stainless steel, when second of welding, welding heat source focus is located on V metal layer, its heat generated by Nb metal layer conductive to interface 3 when, higher than the eutectic reaction temperature of Nb metal layer and niti-shaped memorial alloy, and nearby there is unfused Nb metal layer close to interface 3.The welding method avoids forming intermetallic compound in weld seam, and obtained connector has good mechanical property.
Description
Technical field
The invention belongs to metal material interface welding procedure fields, in particular to a kind of niti-shaped memorial alloy
With stainless steel dissimilar welded joint welding method.
Background technique
Niti-shaped memorial alloy has special shape memory effect and super-elasticity, and specific strength is high, it is wear-resistant, resist it is tired
The features such as labor, corrosion-resistant and good biocompatibility, is widely used in the neck such as aerospace, instrument and meter and medical equipment
Domain, but its higher cost, using still there is biggish limitation.Often niti-shaped memorial alloy and other materials are used in combination,
Such as Nitinol is compound with medical stainless steel, as seal wire application, the characteristic of Nitinol is not only utilized, shows and leads
The flexibility and super-elasticity of silk, while the high intensity that stainless steel is utilized again pushes seal wire into blood vessel to reach, and realizes body
Outer control and twist operation, and stainless steel connect that there are following difficult points with Nitinol: 1, the fusing point of nickel be 1453 degree, titanium fusing point
It is 1535 degree for 1668 degree, iron fusing point, this hot melting temperature difference is shown when the two is welded, since fusing point is different,
Hot melt and the temperature difference of heat cure lead to mutually molten difficulty；2, change between weld interface brittle Ti-Fe metal easy to form when welding
Close object and crackle；3, easily cause to aoxidize in welding process, simultaneously because dissolving each other, mutual molten part is caused to change NiTi shape note
Recall alloying component and tissue, the shape memory effect and super-elasticity of heterojunction structure are severely impacted.
The above problem, which has become, restricts marmem and stainless steel dissimilar metal structure in the neck such as medical treatment, aerospace
The widely used major technology bottleneck in domain, therefore, research and development niti-shaped memorial alloy are connected with stainless steel dissimilar metal high quality
Technology has important practical engineering application value and wide application prospect, has done many work, example to this scientific worker
If patent CN105562867A is disclosed using nickel or silver solder as middle layer, rotation fusion welds are combined using minimum melting welding solder joint
The multi-point welding method at position realizes the welding of Nitinol and stainless steel.But this method is only applicable to tiny seal wire, works as weldering
Joint performance can then significantly reduce when junction is larger.It is then used when welding titanium with pipe line steel disclosed in patent CN104942462A
Cu-V-Nb welding wire, the welding wire include red copper coating and niobium powder and the core wire that vanadium powder is mixed to get, very due to copper and titanium intersolubility
Small, there are larger differences for physical and chemical properties, easily form Ti in the case where welding heat effectxCuyType weld metal zone brittle intermetallic thing,
Low melting point eutectic is also easily formed, weldability is poor.Patent CN102152017A is disclosed using fine copper as TiNi shape note
Recall the middle layer solder of alloy Yu austenitic stainless steel dissimilar material, although connector tensile strength is up to 490MPa or more,
Its elongation percentage highest only reaches 5.2%.
Summary of the invention
Based on defect of the existing technology, the purpose of the present invention is to provide a kind of new niti-shaped memorial alloy with
Stainless steel dissimilar welded joint connection method, the method achieve effective welding of niti-shaped memorial alloy and stainless steel, avoid
Problem when niti-shaped memorial alloy and stainless welding, the dissimilar welded joint welded is with certain tensile strength
With good elongation percentage.
In order to realize above-mentioned purpose of the invention, by a large number of experiments research and unremitting effort, it is finally obtained following skill
Art scheme:
A kind of niti-shaped memorial alloy and the connection method of stainless steel dissimilar welded joint, niti-shaped memorial alloy with it is stainless
Two layers of middle layer solder is added between steel, and is completed by welding twice, two layers of middle layer solder is V metal layer and Nb gold
Belong to layer, wherein stainless steel and V metal layer combination interface are interface 1, and V metal layer and Nb metal layer combination interface are interface 2, Nb gold
Belonging to layer and niti-shaped memorial alloy combination interface is interface 3, when welding for the first time, welding heat source focus is located on stainless steel,
Second when welding, and welding heat source focus is located on V metal layer, when the heat generated passes through Nb metal layer conductive to interface 3,
Nearby there is unfused Nb metal layer higher than the eutectic reaction temperature of Nb metal layer and niti-shaped memorial alloy, and close to interface 3.
Niti-shaped memorial alloy as described above and the connection method of stainless steel dissimilar welded joint, include the following steps:
The determination of a middle layer solder: two layers of middle layer is added between stainless steel and niti-shaped memorial alloy contact interface
Gap is not stayed at solder, interface 1, interface 2 and interface 3, and V metal slice width is 0.8-1.0mm, and Nb metal slice width is 0.6-0.8mm；
B heat source position determines: using laser welding mode, laser facula is placed in stainless steel lateral extent when welding for the first time
Interface 1 is at the position 0.3-0.5mm；Laser facula is placed on V metal layer when second of welding, is 0.1- apart from interface 2
At the position 0.3mm；
C thermal output control: the heat of control laser heat source output when welding for the first time melts interface 1, interface 2 and boundary
Face 3 is not melted, while there are unfused V metal layers between interface 1 and interface 2；When second of welding, laser is controlled
The heat of heat source output, interface 1 is unaffected, melts interface 2, while guaranteeing nearby there is unfused Nb gold close to interface 3
Belong to layer, and the temperature through being thermally conducted to interface 3 is higher than Nb/NiTi eutectic temperature；It is finally formed at interface 1 and interface 2 molten
Change welding line, and forms contact reaction brazing weld seam at interface 3.
Preferably, niti-shaped memorial alloy as described above and the connection method of stainless steel dissimilar welded joint are carrying out c thermal output
When rate-determining steps, inert gas shielding is carried out to fusion zone and heat affected area.
Preferably, niti-shaped memorial alloy as described above and the connection method of stainless steel dissimilar welded joint, the V metal layer and
Nb metal layer distinguishes pure V and pure Nb welding wire.
Preferably, niti-shaped memorial alloy as described above and the connection method of stainless steel dissimilar welded joint, welding is joined for the first time
Laser power is 600w-800w, defocusing amount 0-1mm, speed of welding 1m/min-1.4m/min in number；Second of welding ginseng
Laser power is 500w-600w, defocusing amount 0-1mm, speed of welding 1.4m/min-1.7m/min in number；When welding twice,
Shield gas flow rate is positive 15-17L/min, back side 8-12L/min.
Preferably, niti-shaped memorial alloy as described above and the connection method of stainless steel dissimilar welded joint, the NiTi shape
Memorial alloy is the alloy that niti atomic percent is 55.7:44.3, and atomic percent here is two kinds of Elements Atoms
The ratio between number.
Preferably, niti-shaped memorial alloy as described above and the connection method of stainless steel dissimilar welded joint, the stainless steel are
The common stainless steel material such as 304 stainless steels or 316 stainless steels.
The present invention compared with the existing technology, has the following technical effect that
(1) the method for the present invention is based on iron and vanadium is formed without intermetallic compound, vanadium and niobium infinitely dissolve, and niobium and NiTi shape
Shape memory alloys can occur eutectic reaction and be formed without intermetallic compound, defeated by accurately controlling light-beam position and sweating heat
Enter, so that V/ stainless steel and the interface V/Nb form fusion welding connecting sewing, and is that contact is anti-at Nb/ niti-shaped memorial alloy interface
Soldering connection is answered, stainless steel and Nb are physically separated from by unfused V, while unfused Nb is by V and niti-shaped memorial alloy
It separates, avoids the intermetallic compounds such as Fe-Ti, Fe-Nb and Ni-V and formed, formed in weld seam without intermetallic compound；
(2) niti-shaped memorial alloy that the method for the present invention obtains/stainless steel dissimilar metal joint is with higher-strength
With good plasticity, tensile strength reaches 260-300MPa, and elongation percentage reaches 12-15%；
(3) tension test, tension failure are carried out to obtained niti-shaped memorial alloy/stainless steel dissimilar metal joint
Position is located at unfused V middle layer, is in ductile fracture mode；
(4) pure Nb, pure V packing material have the characteristics that intensity is lower, plasticity is good, are advantageously implemented as middle layer form
Automation of Welding improves production efficiency.
Detailed description of the invention
Fig. 1 is 1Fe/NiTi of embodiment of the present invention dissimilar metal connector laser welding schematic top plan view；
Fig. 2 is 1Fe/NiTi of embodiment of the present invention dissimilar metal connector laser welding schematic side view；
Fig. 3 is the Fe/NiTi dissimilar metal laser weld joint that 1 method of the embodiment of the present invention is prepared；
Fig. 4 is the cross-sectional morphology figure that Fe/NiTi dissimilar metal laser weld joint is prepared in the embodiment of the present invention 1
Picture；
Fig. 5 is that 304 and 304/V fusing in Fe/NiTi dissimilar metal laser weld joint is prepared in the embodiment of the present invention 1
Regional boundary face microstructure image；
Fig. 6 is that the fusion zone 304/V in Fe/NiTi dissimilar metal laser weld joint is prepared is micro- for the embodiment of the present invention 1
See organization chart picture；
Fig. 7 be the embodiment of the present invention 1 be prepared in Fe/NiTi dissimilar metal laser weld joint the fusion zone 304/V with
The interface microstructure image of unfused V；
Fig. 8 is that microcosmic group of the interface V/Nb in Fe/NiTi dissimilar metal laser weld joint is prepared in the embodiment of the present invention 1
Knit image；
Fig. 9 is that the fusion zone V/Nb tissue in Fe/NiTi dissimilar metal laser weld joint is prepared in the embodiment of the present invention 1
Image；
Figure 10 is that the interface Nb/NiTi in Fe/NiTi dissimilar metal laser weld joint is prepared is micro- for the embodiment of the present invention 1
See organization chart picture；
Figure 11 is the stress strain curve that Fe/NiTi dissimilar metal laser weld joint is prepared in the embodiment of the present invention 1；
Figure 12 is the Fe/NiTi dissimilar metal laser weld joint tension failure assay maps that the embodiment of the present invention 1 obtains.
Specific embodiment
Technical solution of the present invention is clearly and completely described below with reference to embodiment, the following example is only used for
Illustrate the present invention, and is not construed as limiting the scope of protection of the present invention.In addition, particular technique operating procedure is not specified in embodiment
Or condition person, described technology or conditions or carried out according to the literature in the art according to product description.Examination used
Production firm person is not specified in agent or instrument, and being can be with conventional products that are commercially available.
1 niti-shaped memorial alloy of embodiment/stainless steel dissimilar metal joint welding:
According to shown in Fig. 1, niti-shaped memorial alloy (Ni:Ti atomic ratio=55.7:44.3) and 304 stainless steels are carried out
Laser welding, wherein NiTi form memorial alloy is identical as 304 stainless steel plate size specifications, be 100mm (length) ×
50mm (width) × 0.8mm (thickness), V and Nb middle layer solder is placed between niti-shaped memorial alloy and 304 test plate (panel) interfaces, is such as schemed
Shown in 1, wherein V is directly contacted with stainless steel, and Nb is directly contacted with niti-shaped memorial alloy, at the same guarantee 304/V, V/Nb and
The gap Nb/NiTi each interface Jian Buliu, Nb middle layer bead width are 0.8mm, and V middle layer bead width is 1mm.First
Laser is placed in 304 stainless steel sides, distance 304/V interface 0.4mm, laser weld parameters: 800W, defocusing amount 0mm, weldering when welding
Meet speed 1.2m/min；Laser is placed in the side V, distance V/Nb interface 0.1mm, laser weld parameters: laser when second of welding
Power 600W, defocusing amount 0mm, speed of welding 1.7m/min；When welding twice, argon gas shield gas flow rate is front 17L/min,
Back side 12L/min, after welding twice, welding effect is as shown in Figure 2.
Finally obtained niti-shaped memorial alloy/stainless steel dissimilar metal joint as shown in figure 3, butt joint weld
The microstructure observation for carrying out cross section, obtains the whole cross-sectional morphology image and not of the welding point as shown in Fig. 4 to Figure 10
With interface microstructure image, observe above-mentioned image it is found that wherein 304 with V mid layer section melt, formed fusing welding line, V
It being melted with Nb mid layer section, forms fusing welding line, Nb/NiTi interface temperature is higher than Nb/NiTi eutectic temperature (1170 DEG C),
Form contact reaction brazing weld seam, in welding process, there are unfused V middle layer between the interface V/Fe and the interface V/Nb,
There are unfused Nb middle layers between the interface V/Nb and the interface Nb/NiTi.
It is formed in the microstructure in welding point it can be seen from Fig. 4 to Figure 10 without any intermetallic compound.
To obtained niti-shaped memorial alloy/stainless steel dissimilar metal joint according to GB/T 228-2002 " metal material
Tensile testing at ambient temperature " mechanical stretch test is carried out, stress strain curve is as shown in figure 11, it is seen that connector tensile strength is
It is as shown in figure 12 to break rear fracture location for 300MPa, elongation after fracture 15%.
2 niti-shaped memorial alloys of embodiment/stainless steel dissimilar metal joint welding:
Laser welding is carried out to niti-shaped memorial alloy (Ni:Ti atomic ratio=55.7:44.3) and 304 stainless steels,
Middle NiTi form memorial alloy is identical as 304 stainless steel plate size specifications, is 100mm (length) × 50mm (width) × 0.8mm
V and Nb middle layer solder is placed between niti-shaped memorial alloy and 304 test plate (panel) interfaces by (thickness), and wherein V directly connects with stainless steel
Touching, Nb are directly contacted with niti-shaped memorial alloy, guarantee the gap 304/V, V/Nb and Nb/NiTi each interface Jian Buliu, Nb
Middle layer bead width is 0.6mm, and V middle layer bead width is 0.8mm.Laser is placed in 304 stainless steels when first of welding
Side, distance 304/V interface 0.5mm, laser weld parameters: laser power 800W, defocusing amount 1mm, speed of welding 1m/min；Second
Laser is placed in the side V, distance V/Nb interface 0.3mm, laser weld parameters: 600W, defocusing amount 1mm, speed of welding when secondary welding
1.4m/min；When welding twice, argon gas shield gas flow rate is front 15L/min, back side 8L/min.
Microexamination, available identical micrograph as shown in Example 1 are carried out to obtained titanium nickel dissimilar welded joint
Picture；Mechanical stretch test is carried out to obtained titanium nickel dissimilar welded joint, connector tensile strength is 260MPa, elongation percentage 12%.
3 niti-shaped memorial alloys of embodiment/stainless steel dissimilar metal joint welding:
Laser welding is carried out to niti-shaped memorial alloy (Ni:Ti atomic ratio=55.7:44.3) and 304 stainless steels,
Middle NiTi form memorial alloy is identical as 304 stainless steel plate size specifications, is 100mm (length) × 50mm (width) × 0.8mm
V and Nb middle layer solder is placed between niti-shaped memorial alloy and 304 test plate (panel) interfaces by (thickness), and wherein V directly connects with stainless steel
Touching, Nb are directly contacted with niti-shaped memorial alloy, guarantee the gap 304/V, V/Nb and Nb/NiTi each interface Jian Buliu, Nb
Middle layer bead width is 0.8mm, and V middle layer bead width is 0.8mm.Laser is placed in 304 stainless steels when first of welding
Side, distance 304/V interface 0.3mm, laser weld parameters: laser power 800W, defocusing amount 0mm, speed of welding 1.4m/min；The
Laser is placed in the side V, distance V/Nb interface 0.2mm, laser weld parameters: 600W, defocusing amount 1mm, welding speed when secondary welding
Spend 1.5m/min；When welding twice, argon gas shield gas flow rate is front 17L/min, back side 12L/min.
Finally obtained niti-shaped memorial alloy/stainless steel dissimilar metal joint as shown in figure 3, butt joint weld
The microstructure observation result for carrying out cross section is identical as embodiment 1, and 304 stainless steels and V mid layer section melt, and is formed molten
Change welding line；V and Nb mid layer section melt, and form fusing welding line；Nb/NiTi interface temperature is higher than Nb/NiTi eutectic temperature
It spends (1170 DEG C), forms contact reaction brazing weld seam；In welding process, there are unfused between the interface V/Fe and the interface V/Nb
V middle layer, there are unfused Nb middle layers between the interface V/Nb and the interface Nb/NiTi.
Microexamination, available identical micrograph as shown in Example 1 are carried out to obtained titanium nickel dissimilar welded joint
Picture；Mechanical stretch test is carried out to obtained titanium nickel dissimilar welded joint, connector tensile strength is 285MPa, elongation percentage 12%.
4 niti-shaped memorial alloys of embodiment/stainless steel dissimilar metal joint welding:
Laser welding is carried out to niti-shaped memorial alloy (Ni:Ti atomic ratio=55.7:44.3) and 304 stainless steels,
Middle NiTi form memorial alloy is identical as 304 stainless steel plate size specifications, is 100mm (length) × 50mm (width) × 0.8mm
V and Nb middle layer solder is placed between niti-shaped memorial alloy and 304 test plate (panel) interfaces by (thickness), and wherein V directly connects with stainless steel
Touching, Nb are directly contacted with niti-shaped memorial alloy, guarantee the gap 304/V, V/Nb and Nb/NiTi each interface Jian Buliu, Nb
Middle layer bead width is 0.6mm, and V middle layer bead width is 0.8mm.Laser is placed in 304 stainless steels when first of welding
Side, distance 304/V interface 0.4mm, laser weld parameters: laser power 800W, defocusing amount 1mm, speed of welding 1.4m/min；The
Laser is placed in the side V, distance V/Nb interface 0.2mm, laser weld parameters: 600W, defocusing amount 1mm, welding speed when secondary welding
Spend 1.5m/min；When welding twice, argon gas shield gas flow rate is front 17L/min, back side 12L/min.
Finally obtained niti-shaped memorial alloy/stainless steel dissimilar metal joint as shown in figure 3, butt joint weld
The microstructure observation result for carrying out cross section is identical as embodiment 1, wherein 304 stainless steels and V mid layer section melt, shape
At fusing welding line；V and Nb mid layer section melt, and form fusing welding line；Nb/NiTi interface temperature is total higher than Nb/NiTi
Brilliant temperature (1170 DEG C), forms contact reaction brazing weld seam；In welding process, exist not between the interface V/Fe and the interface V/Nb
The V middle layer of fusing, there are unfused Nb middle layers between the interface V/Nb and the interface Nb/NiTi；
Microexamination, available identical micrograph as shown in Example 1 are carried out to obtained titanium nickel dissimilar welded joint
Picture；Mechanical stretch test is carried out to obtained titanium nickel dissimilar welded joint, connector tensile strength is 265MPa, elongation percentage 12.5%.
Comparative example 1 (welding of unrepeatered transmission solder)
Laser welding carried out to niti-shaped memorial alloy (Ni:Ti atomic ratio=55.7:44.3) and 304 stainless steels, two
Person's dimensions is identical, is 100mm (length) × 50mm (width) × 0.8mm (thickness), niti-shaped memorial alloy is different with stainless steel
Kind metal directly carries out laser welding, and laser facula is located on 304 stainless steels/niti-shaped memorial alloy interface, two-sided argon gas
Laser welding, laser welding process parameter are carried out under protective atmosphere are as follows: laser power 600W, defocusing amount 1mm, speed of welding
1.4m/min, in two-sided protective atmosphere, front protecting throughput 17L/min, back-protective throughput 12L/min.
As a result, it has been found that between easily generating a large amount of metals when 304 stainless steels and the welding of niti-shaped memorial alloy memorial alloy
Compound after welding, is broken with the presence of a large amount of crackle in weld seam at weld.
Comparative example 2 (only Nb middle layer solder)
Choose niti-shaped memorial alloy (Ni:Ti atomic ratio=55.7:44.3) and 304 stainless steels, the two dimensions
It is identical, it is 100mm (length) × 50mm (width) × 0.8mm (thickness), V+Nb double layer of metal solder used in the examples is replaced
For Nb middle layer solder, Nb intermediate layer thickness is 0.6mm, and light beam is located at 304 stainless steels/side Nb, laser welding process parameter are as follows:
Laser power 800W, defocusing amount 0mm, speed of welding 1.4m/min, in two-sided protective atmosphere, front protecting throughput 17L/min,
Back-protective throughput 12L/min.
As a result, it has been found that thering is a large amount of Fe-Nb intermetallic compound to deposit in weld seam although not finding crackle in weld seam
It is 210MPa in, connector tensile strength, the plasticity of elongation percentage 3.1%, weld seam is poor.
Comparative example 3 (only V middle layer solder)
Choose niti-shaped memorial alloy (Ni:Ti atomic ratio=55.7:44.3) and 304 stainless steels, the two dimensions
It is identical, it is 100mm (length) × 50mm (width) × 0.8mm (thickness), V+Nb double layer of metal solder used in the examples is replaced
For V middle layer solder, V intermediate layer thickness is 0.8mm, and first of welding light beam is located at 304 stainless steel sides, the interface distance 304/V
0.3mm, second welding light beam are located at the interface V/NiTi, and two welding conditions are all laser power 800W, defocusing amount
0mm, speed of welding 1.4m/min, in two-sided protective atmosphere, front protecting throughput 17L/min, back-protective throughput 12L/
min.With the presence of a large amount of Ni-V intermetallic compound in weld seam, connector tensile strength is 187MPa, elongation percentage 2.5%.
Comparative example 4 (by the location swap of two kinds of middle layer solders of V/Nb)
Choose niti-shaped memorial alloy (Ni:Ti atomic ratio=55.7:44.3) and 304 stainless steels, the two dimensions
It is identical, it is 100mm (length) × 50mm (width) × 0.8mm (thickness), the V+Nb double layer of metal solder positions that will be used in embodiment 4
It exchanges, Nb middle layer bead width is 0.6mm, and V middle layer bead width is 0.8mm.First of welding light beam is located at 304/Nb
Interface, second welding light beam are located at the interface V/NiTi, and two welding conditions are all laser power 800W, defocusing amount
0mm, speed of welding 1.4m/min, in two-sided protective atmosphere, front protecting throughput 17L/min, back-protective throughput 12L/
min.There is a large amount of Fe-Ni. in weld seam, Ni-V intermetallic compound exists, and has crackle to be formed in weld seam, connector tension
Intensity is 150MPa, elongation percentage 1.8%.
Comparative example 5
It is welded with diameter disclosed in patent CN104942462A for the Cu-V-Nb welding wire of 1.2mm, wherein Nb in core wire
Silty amount 40%, V powder 60%, medicinal powder loading are 20%, and coating is red copper, are welded according to the application method, as a result, it has been found that, weldering
There are Fe-Nb, the production of chemicals such as Ti-Cu in seam, the intensity of obtained welding point is 320Mpa, elongation percentage 3.5%.
Comparative example 6
It is welded, is obtained according to process described in embodiment 1 with a thickness of 100 microns as middle layer solder using fine copper
Connector tensile strength be only 198MPa, elongation percentage 4.5%.
Comparative example 7 (only Ni middle layer solder)
Choose niti-shaped memorial alloy (Ni:Ti atomic ratio=55.7:44.3) and 304 stainless steels, the two dimensions
It is identical, all it is 100mm (length) × 50mm (width) × 0.8mm (thickness), V+Nb double layer of metal solder used in the examples is replaced
For individual Ni middle layer solder, Ni intermediate layer thickness is 0.6mm, and light beam is located at 304 stainless steels/side Ni, laser welding process
Parameter are as follows: laser power 800W, defocusing amount 0mm, speed of welding 1.4m/min, in two-sided protective atmosphere, front protecting throughput
17L/min, back-protective throughput 12L/min.
As a result, it has been found that there is a large amount of Ni in weld seamXNi3Intermetallic compound generates, and connector tensile strength is 310MPa, prolongs
Stretch rate 5.2%.
Claims (7)
1. a kind of niti-shaped memorial alloy and the connection method of stainless steel dissimilar welded joint, it is characterised in that: in nickel-titanium shape memory
Two layers of middle layer solder is added between alloy and stainless steel, and is completed by welding twice, two layers of middle layer solder difference
For V metal layer and Nb metal layer, wherein stainless steel and V metal layer combination interface are interface 1, and V metal layer is in conjunction with Nb metal layer
Interface is interface 2, and Nb metal layer and niti-shaped memorial alloy combination interface are interface 3, and when welding for the first time, welding heat source is burnt
Point is located on stainless steel, and when welding for the second time, welding heat source focus is located on V metal layer, and the heat generated passes through Nb metal
When layer is transmitted to interface 3, higher than the eutectic reaction temperature of Nb metal layer and niti-shaped memorial alloy, and near interface 3
There is unfused Nb metal layer.
2. niti-shaped memorial alloy and the connection method of stainless steel dissimilar welded joint according to claim 1, it is characterised in that packet
Include following steps:
The determination of a middle layer solder: being added two layers of middle layer solder between stainless steel and niti-shaped memorial alloy contact interface,
Gap is not stayed at interface 1, interface 2 and interface 3, and V metal slice width is 0.8-1.0mm, and Nb metal slice width is 0.6-0.8mm；
B heat source position determines: using laser welding mode, laser facula is placed in stainless steel lateral extent interface when welding for the first time
1 is at the position 0.3-0.5mm；Laser facula is placed on V metal layer when second of welding, is 0.1-0.3mm apart from interface 2
Set place；
C thermal output control: the heat of control laser heat source output when welding for the first time melts interface 1, interface 2 and interface 3 are not
It melts, while there are unfused V metal layers between interface 1 and interface 2；When second of welding, laser heat source is controlled
The heat of output, interface 1 is unaffected, melts interface 2, while guaranteeing nearby there is unfused Nb metal layer close to interface 3,
And the temperature through being thermally conducted to interface 3 is higher than Nb/NiTi eutectic temperature；Fusion welding weldering is finally formed at interface 1 and interface 2
Seam, and contact reaction brazing weld seam is formed at interface 3.
3. niti-shaped memorial alloy and the connection method of stainless steel dissimilar welded joint according to claim 2, it is characterised in that: institute
It states V metal layer and Nb metal layer distinguishes pure V and pure Nb welding wire.
4. niti-shaped memorial alloy and the connection method of stainless steel dissimilar welded joint according to claim 2, it is characterised in that:
When carrying out c thermal output rate-determining steps, inert gas shielding is carried out to fusion zone and heat affected area.
5. niti-shaped memorial alloy and the connection method of stainless steel dissimilar welded joint according to claim 2, it is characterised in that: the
Laser power is 600w-800w, defocusing amount 0-1mm, speed of welding 1m/min-1.4m/min in welding parameter；The
Laser power is 500w-600w, defocusing amount 0-1mm, speed of welding 1.4m/min-1.7m/min in secondary welding parameter；
When welding twice, shield gas flow rate is positive 15-17L/min, back side 8-12L/min.
6. niti-shaped memorial alloy and the connection method of stainless steel dissimilar welded joint according to claim 2, it is characterised in that: institute
Stating niti-shaped memorial alloy is the alloy that niti atomic percent is 55.7:44.3.
7. niti-shaped memorial alloy and the connection method of stainless steel dissimilar welded joint according to claim 2, it is characterised in that: institute
Stating stainless steel is 304 stainless steels or 316 stainless steels.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811629364.0A CN109570762B (en) | 2018-12-29 | 2018-12-29 | Method for connecting nickel-titanium shape memory alloy and stainless steel heterojunction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811629364.0A CN109570762B (en) | 2018-12-29 | 2018-12-29 | Method for connecting nickel-titanium shape memory alloy and stainless steel heterojunction |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109570762A true CN109570762A (en) | 2019-04-05 |
| CN109570762B CN109570762B (en) | 2020-12-11 |
Family
ID=65932275
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811629364.0A Active CN109570762B (en) | 2018-12-29 | 2018-12-29 | Method for connecting nickel-titanium shape memory alloy and stainless steel heterojunction |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109570762B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2732303C1 (en) * | 2020-04-27 | 2020-09-15 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Казанский национальный исследовательский технический университет им. А.Н. Туполева-КАИ" (КНИТУ-КАИ) | Method of welding and soldering of dissimilar metal alloys with a laser beam |
| CN114473168A (en) * | 2020-10-27 | 2022-05-13 | 中国科学院金属研究所 | Welding method for large-size NiTi shape memory alloy and stainless steel component |
| CN115041794A (en) * | 2022-06-24 | 2022-09-13 | 厦门宏发电声股份有限公司 | Welding process method for connecting TiNi shape memory alloy wire and stainless steel |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101504021A (en) * | 2009-03-19 | 2009-08-12 | 上海宝钢工程技术有限公司 | Connection method for titanium plate and stainless steel plate |
| CN105855705A (en) * | 2016-06-23 | 2016-08-17 | 吉林大学 | Stainless steel-tita nium alloy different metal laser welding method |
| CN107931840A (en) * | 2017-11-22 | 2018-04-20 | 宝鸡文理学院 | A kind of titanium nickel dissimilar welded joint induced with laser monotectic and uniform grain Reaction Welding method |
| CN109048012A (en) * | 2018-08-02 | 2018-12-21 | 广东省焊接技术研究所（广东省中乌研究院） | A kind of welding method and its application of titanium steel composite board |
| CN109317794A (en) * | 2018-12-07 | 2019-02-12 | 安徽工业大学 | A kind of titanium alloy and stainless steel fill out powder plasma welding method |
-
2018
- 2018-12-29 CN CN201811629364.0A patent/CN109570762B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101504021A (en) * | 2009-03-19 | 2009-08-12 | 上海宝钢工程技术有限公司 | Connection method for titanium plate and stainless steel plate |
| CN105855705A (en) * | 2016-06-23 | 2016-08-17 | 吉林大学 | Stainless steel-tita nium alloy different metal laser welding method |
| CN107931840A (en) * | 2017-11-22 | 2018-04-20 | 宝鸡文理学院 | A kind of titanium nickel dissimilar welded joint induced with laser monotectic and uniform grain Reaction Welding method |
| CN109048012A (en) * | 2018-08-02 | 2018-12-21 | 广东省焊接技术研究所（广东省中乌研究院） | A kind of welding method and its application of titanium steel composite board |
| CN109317794A (en) * | 2018-12-07 | 2019-02-12 | 安徽工业大学 | A kind of titanium alloy and stainless steel fill out powder plasma welding method |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2732303C1 (en) * | 2020-04-27 | 2020-09-15 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Казанский национальный исследовательский технический университет им. А.Н. Туполева-КАИ" (КНИТУ-КАИ) | Method of welding and soldering of dissimilar metal alloys with a laser beam |
| CN114473168A (en) * | 2020-10-27 | 2022-05-13 | 中国科学院金属研究所 | Welding method for large-size NiTi shape memory alloy and stainless steel component |
| CN114473168B (en) * | 2020-10-27 | 2024-05-17 | 中国科学院金属研究所 | Welding method of large-size NiTi shape memory alloy and stainless steel member |
| CN115041794A (en) * | 2022-06-24 | 2022-09-13 | 厦门宏发电声股份有限公司 | Welding process method for connecting TiNi shape memory alloy wire and stainless steel |
| CN115041794B (en) * | 2022-06-24 | 2024-01-09 | 厦门宏发电声股份有限公司 | Welding process method for connecting TiNi shape memory alloy wire with stainless steel |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109570762B (en) | 2020-12-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107127454B (en) | Using titanium alloy-stainless steel dissimilar metal laser welding method of composite interlayer | |
| Pardal et al. | Dissimilar metal joining of stainless steel and titanium using copper as transition metal | |
| Li et al. | Laser welding of TiNi shape memory alloy and stainless steel using Ni interlayer | |
| CN109570762A (en) | A kind of niti-shaped memorial alloy and the connection method of stainless steel dissimilar welded joint | |
| US6875949B2 (en) | Method of welding titanium and titanium based alloys to ferrous metals | |
| CN107335921B (en) | Add titanium alloy-stainless steel dissimilar metal laser welding method of vanadium middle layer | |
| CN107931840B (en) | Laser-induced monotectic and homogeneous reaction welding method for titanium-nickel heterojunction | |
| Liu et al. | Microstructure and mechanical properties of laser welding of Ti6Al4V to Inconel 718 using Nb/Cu interlayer | |
| Gao et al. | Dissimilar metal welding of Ti6Al4V and Inconel 718 through pulsed laser welding-induced eutectic reaction technology | |
| Xia et al. | Interfacial microstructure and mechanical property of TC4 titanium alloy/316L stainless steel joint brazed with Ti-Zr-Cu-Ni-V amorphous filler metal | |
| Gao et al. | Laser welding of Ti6Al4V to Cu using a niobium interlayer | |
| CN110421223A (en) | Using titanium alloy-stainless steel dissimilar metal laser method for welding of copper base solder | |
| CN102152017A (en) | Method for connecting TiNi shape memory alloy and austenitic stainless steel heterogenetic material | |
| CN109014471A (en) | A kind of metal inert-gas arc brazing technique of titanium alloy-stainless steel | |
| Chaudhari et al. | Reliability of dissimilar metal joints using fusion welding: A Review | |
| Hu et al. | Fiber laser welding of Ti–6Al–4V to Inconel 718 bimetallic structure via Cu/Ta multi-interlayer | |
| CN108188582A (en) | A kind of compound welding with filler wire method of laser-electric arc for being used to prepare magnesium/steel dissimilar metal tailor welded | |
| CA2902152C (en) | Low carbon boron bearing nickel based welding material | |
| Zhou et al. | Laser joining of Mo and Ta sheets with Ti6Al4V or Ni filler | |
| CN107297569B (en) | A kind of titanium copper dissimilar metal connector welding method | |
| Li et al. | Dissimilar gas tungsten arc welding of TC4 titanium to 304 stainless steel using CuSi3 filler wire | |
| Jawad et al. | Evaluation of welded joints of dissimilar titanium alloy Ti-5Al-2.5 Sn and stainless-steel 304 at different multi-interlayer modes | |
| CN107931836A (en) | TiAl alloy and Ni based high-temperature alloy dissimilar material joining methods | |
| CN107999983A (en) | Ti3Al based alloys and Ni based high-temperature alloy dissimilar material joining methods | |
| RU2450197C1 (en) | Joint of pipeline from stainless steel with vessel from titanium alloy and method of its realisation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |