CN108067732A - A kind of method for inhibiting titanium-steel composite board Butt Joint transition zone crackle - Google Patents
A kind of method for inhibiting titanium-steel composite board Butt Joint transition zone crackle Download PDFInfo
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- CN108067732A CN108067732A CN201711139412.3A CN201711139412A CN108067732A CN 108067732 A CN108067732 A CN 108067732A CN 201711139412 A CN201711139412 A CN 201711139412A CN 108067732 A CN108067732 A CN 108067732A
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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
- B23K26/34—Laser welding for purposes other than joining
- B23K26/342—Build-up 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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/0006—Working by laser beam, e.g. welding, cutting or boring taking account of the properties of the material involved
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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
- B23K26/60—Preliminary treatment
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Abstract
The invention discloses a kind of methods for inhibiting titanium steel composite board Butt Joint transition zone crackle, are included at titanium steel composite board banjo fixing butt jointing and form molybdenum transition zone weld seam using the method for laser landfill molybdenum welding wire.The method of the present invention obtains welding point and the presence of type crackle is not extended through in tri- intersections of area of Ti/Mo/Fe, and the near interface between Mo transition zones and Fe fill areas occurs one more apparent " softened zone ", the region microhardness is about significantly lower than the microhardness of steel layer fusion zone, the presence of the softened region has the brittle cracking phenomenon occurred beneficial to inhibition transition zone near zone, and is conducive to inhibit the extension of crackle.
Description
Technical field
The invention belongs to welding technology fields, and in particular to it is compound to inhibit titanium-steel by the use of molybdenum (Mo) welding wire as transition zone
The method that plate Butt Joint transition zone crackle generates.
Background technology
Titanium-steel dissimilar metal component tool saves precious metal material, realizes low cost there are two types of the comprehensive advantage of material
It with high performance perfect adaptation, has broad application prospects, is widely used in the industrial production.In recent years, petrochemical industry and change
The fields such as chemical container equipment, Seawater Desalination Project, nuclear power generating equipment reach nearly ten thousand tons every year to the demand of titanium-steel composite board.
It generally requires to be docked when titanium-steel composite board is used as structural member, welding, and with traditional welding process and side
When method welds titanium-steel composite board, due to titanium, the physical and chemical performance most diverse of steel, easily occur thermal stress mismatch and
The problems such as generating weld metal zone brittle intermetallic thing causes its joint performance to deteriorate.On the one hand, the fusing point of titanium and iron, thermal conductivity and line
Coefficient of expansion difference is larger, causes to be also easy to produce larger internal stress in welding process.It on the other hand, can according to Fe-Ti binary phase diagramls
Know, the two intersolubility is poor, can generate TiFe, TiFe2Etc. weld metal zone brittle intermetallic things.The generation of brittlement phase can not only reduce interface
Bond strength and plasticity will also become the formation of crack during composite plate processing use.At present, generally use cover board form is real
The welding connection of existing titanium-steel composite board, but there are have gap, connector mistake between metal for the cover board form connection used at present in engineering
Cross slabbing line, the problems such as stress concentration phenomenon is serious so that the overall mechanical properties of connector decline.
In view of the above-mentioned problems, many scholars expand numerous studies.Xu Jin cutting edges of a knife or a sword et al. have invented one kind for welding titanium-steel
The high-entropy alloy welding wire of composite plate, and by TIG weld method once complete titanium-steel composite board base steel layer and titanium coating weldering
It connects, discovery is not easy to form brittle metal part compound using the high-entropy alloy welding wire, and the property of welded joint of acquisition is preferable.Chu Qiao
Tinkling of pieces of jade et al. employs Cu, V and fills metal as transition zone, has studied the TIG flash butt weld(ing)s of titanium-steel composite board.It was found that transition
Sector width reaches about 20mm, and postwelding Cu/V interfaces, Cu/Q345 interfaces, V/Q345 interfaces and Ti/Q345 interfaces have significantly
Crackle occurs, and tri- regional boundary faces of CP-Ti/Q345/V observe TiFe intermetallic compounds.Ning Jie et al. uses Cu as intermediate mistake
It crosses layer and is prepared for titanium-steel composite board wire filling laser welding banjo fixing butt jointing.Prepared banjo fixing butt jointing SEM, EDS analysis result shows
There is different degrees of Fe/Ti mixing in tri- intersections of area of Ti/Fe/Cu, cause the generation of Ti-Fe compounds, but its transition zone
Peak width is smaller, is only 1.5mm.
The content of the invention
For existing titanium-steel composite board welding point there are the problem of and defect, the object of the present invention is to provide one kind
Inhibit the method for titanium-steel composite board Butt Joint transition zone crackle, molybdenum transition is formed using the method for laser landfill molybdenum welding wire
Layer weld seam, solving Butt Joint transition zone has apparent crackle and brittlement phase generation and causes joint mechanical property is poor to ask
Topic.
To achieve these goals, the present invention is realised by adopting the following technical scheme：
A kind of method for inhibiting titanium-steel composite board Butt Joint transition zone crackle, is included in titanium-steel composite board and connects
Molybdenum transition zone weld seam is formed using the method for laser landfill molybdenum welding wire at head.
Further, following steps are specifically included：
Step 1：Step surface is formed between the titanium plate and steel plate of titanium-steel composite board, steel plate one side is processed as inclined-plane, is polished
The oxide of metal surface is removed on inclined-plane on step surface and steel plate, exposes metallic luster；
Step 2：By two pieces by the docking of steps 1 treated titanium-steel composite board, the inclined-plane of the steel plate of titanium-steel composite board
Form double V-groove；Laser backing welding forms backing weld seam at the docking of titanium plate；
Step 3：Back cover titanium wire bond is formed in the lower surface of backing weld seam with titanium silk back cover using wire filling laser welding to stitch；
Step 4：Molybdenum transition zone weld seam, molybdenum mistake are formed using the method for laser landfill molybdenum welding wire in the upper surface of backing weld seam
It crosses a layer weld seam and double V-groove bottom is completely covered；
Step 5：The surface that layer weld seam is crossed in molybdenum continues to form steel wire welding bead using wire filling laser welding landfill steel welding wire, until
Double V-groove is filled up, obtains the titanium-steel composite board of docking.
Further, the angle of the steel plate side double V-groove of docking titanium-steel composite board is 20 °~40 ° in advance.
Further, the width for the backing weld seam that laser backing welding shapes is less than 2mm in step 2.
Further, the width of the back cover titanium wire bond seam in step 3 is 2-4mm, and reinforcement is no more than 1.0mm.
Further, in step 4, laser beam incidence angle and vertical direction angle are 5 °~10 °, wire feed angle and vertical direction
Angle is 60 °~70 °.
Further, in built-up welding molybdenum transition zone weld seam, titanium layer remelting depth is less than 0.5mm；During built-up welding steel wire welding bead, mistake
Layer fusion penetration of weld seam remelting is crossed less than 0.2mm.
Further, the length that titanium plate stretches out steel plate in step surface is 1mm.
Further, the gap width in the two pieces of titanium-steel composite boards docked in advance between titanium plate is less than 0.1mm.
Further, the titanium-steel composite board welds obtained metallurgical junction mould assembly layered bi-metal composite plate for explosion.
Compared with prior art, the beneficial effects of the invention are as follows：
(1) due to Mo and Ti infinitely dissolves, brittlement phase will not be generated, and Mo-Ti solid solution bulk melting points are higher, high-temperature mechanics
Performance is good；The Fe-Mo alloy properties that Mo and Fe is formed in the welding point obtained simultaneously by the method for the present invention are much better than brittleness
Intermetallic compound.The method of the present invention obtains welding point and the presence of type crackle is not extended through in tri- intersections of area of Ti/Mo/Fe,
And there is one more apparent " softened zone " in the near interface between Mo transition zones and Fe fill areas, the region is micro- hard
Degree is about significantly lower than the microhardness of steel layer fusion zone, and the presence of the softened region has to be occurred beneficial to inhibition transition zone near zone
Brittle cracking phenomenon, and be conducive to inhibit crackle extension.
(2) when butt operation is directly carried out to titanium-steel composite board using traditional welding process, easily there is serious thermal stress
The problems such as mismatch and generation weld metal zone brittle intermetallic thing.The method of the present invention is filled out in the welding process using laser welding and laser
The method of wire bond, thermal weld stress amount and fusion zone size are small, and shaping groove size is small, and filling metal is few, efficient.Utilize molybdenum
The characteristics of Laser Welding and small wire filling laser welding heat input, can preferably proof stress deform, and mitigate the heat between steel layer and titanium layer
Stress mismatch phenomenon.
Description of the drawings
Fig. 1 is Ti-Mo binary decision tree phasors；
Fig. 2 is the three-dimensional welding structure schematic diagram in the method for the present invention；
Fig. 3 is the titanium-steel composite board scale diagrams in present example；
Fig. 4 is welding point cross-sectional morphology figure in present example；
Fig. 5 is the enlarged drawing at A in Fig. 4；
Fig. 6 is welding point cross-sectional compositional distribution map in present example, (a) welding point, (b) energy spectrum diagram；
Fig. 7 is the welding point microhardness distribution curve obtained in present example；
Fig. 8 is the welding point transition region cross-sectional morphology figure of comparative example 1.
The meaning of each label in attached drawing：1- titanium plates, 2- steel plates, 3- step surfaces, 4- inclined-planes, 5- backing weld seams, 6- back cover titaniums
Wire bond stitches, 7- molybdenum transition zone weld seams, 8- steel wire welding beads.
Explanation is further explained in detail to the particular content of the present invention with reference to embodiments.
Specific embodiment
The present invention provides a kind of method for inhibiting titanium-steel composite board Butt Joint transition zone crackle, and it is multiple to be included in titanium-steel
Molybdenum transition zone weld seam is formed using the method for laser landfill molybdenum welding wire at plywood banjo fixing butt jointing, is specifically included：
Step 1：Step surface 3 is formed between the titanium plate 1 of titanium-steel composite board and steel plate 2, steel plate one side is processed as inclined-plane 4,
The oxide of metal surface is removed on the inclined-plane polished on step surface and steel plate, exposes metallic luster.
Further, the length that titanium plate stretches out steel plate in step surface 3 is 1mm.The titanium-steel composite board of the present invention welds for explosion
Obtained metallurgical junction mould assembly layered bi-metal composite plate；Such titanium steel dissimilar metal component can be docked between composite plate
Butt welding between weldering or multiple tube.
Step 2：By two pieces by the docking of steps 1 treated titanium-steel composite board, the inclined-plane of the steel plate of titanium-steel composite board
Form double V-groove；Laser backing welding forms backing weld seam 5 at the docking of titanium plate；
Further, the gap width in the two pieces of titanium-steel composite boards docked in advance between titanium plate 1 is less than 0.1mm.Pre- docking
The full bevel angle in steel plate one side (i.e. the angle of double V-groove) of titanium-steel composite board is 20 °~40 °.The shaping of laser backing welding is beaten
The width of back welding seam 5 is less than 2mm.
Step 3：Back cover titanium wire bond seam 6 is formed using wire filling laser welding titanium silk back cover in the lower surface of backing weld seam 5；Into
One step, the width of back cover titanium wire bond seam 6 is 2-4mm, and reinforcement is no more than 1.0mm.
Step 4：Molybdenum transition zone weld seam 7, molybdenum are formed using the method for laser landfill molybdenum welding wire in the upper surface of backing weld seam 5
Double V-groove bottom is completely covered in transition zone weld seam, and steel layer and titanium layer are completely cut off completely, and the thickness of general molybdenum transition zone weld seam is
1mm or so.
Further, during laser landfill molybdenum welding wire, laser beam incidence angle and vertical direction angle are 5 °~10 °, are sent
Silk angle and vertical direction angle are 60 °~70 °.In built-up welding molybdenum transition zone weld seam 7, ensure that titanium layer remelting depth is less than 0.5mm.
Step 5：The surface that layer weld seam 7 is crossed in molybdenum continues to form steel wire welding bead 8 using wire filling laser welding landfill steel welding wire, directly
To double V-groove is filled up, the titanium-steel composite board of docking is obtained.
Further, during built-up welding steel wire welding bead 8, ensure that the fusion penetration of 7 remelting of transition zone weld seam is less than 0.2mm.Continuing heap
During filling out steel welding wire, the mode of successively laser remolten, which can be used, improves weld seam interfacial bonding strength and face of weld pattern.
From Mo-Ti binary phase diagramls (as shown in Figure 1) it is recognised that the metallurgical compatibility between Mo and Ti is fine, the two is several
Uniform grain reaction can occur in the transition process from liquid phase to solid phase, brittle phase will not be generated with infinitely dissolve.Mo and Fe it
Between also have preferable metallurgical compatibility, the content of Mo can be up to 8% in Austenitic heat resisting steel (such as trade mark S32654),
The content of molybdenum high speed steel kind Mo can be up to 10%.
Specific embodiments of the present invention are given below, it is necessary to which explanation is that the invention is not limited in specific examples below
In, all equivalents done on the basis of technical scheme each fall within protection scope of the present invention.
Embodiment 1
It is rolling state TA1/Q235B explosion welderings composite plate (size is 200 × 100 × (1+8) mm) to select titanium steel composite board,
TA1 and Q235B chemical compositions difference is as shown in Table 1 and Table 2.Using pure molybdenum (Mo) welding wire as titanium-steel welding intermediate layer
Packing material, a diameter of 0.8mm.Laser fills out titanium silk back welding selecting TA1 welding wires, and in addition laser fills out steel wire weld selection
ER50-6 steel welding wires, tensile strength are more than 500MPa, have excellent plasticity, toughness and cracking resistance, especially low-temperature impact
Toughness is higher.
Table 1 show TA1 chemical component tables (wt.%).
Table 2 show Q235B chemical component tables (wt.%).
Two pieces of TA1/Q235B composite plates are processed into groove and step surface, the full bevel angle of V-type is 40 °, titanium in step surface
Plate reaches the outer 1mm of steel substrate, and specific size is as shown in Figure 3.By two pieces of TA1/Q235B ply-metal Butt Assemblings, control
Butt seam between titanium plate step in both sides processed is less than 0.1mm, and unfitness of butt joint is also smaller than 0.1mm.It is polished before weldering with sand paper and uses acetone
Surface to be welded and welding wire are cleaned, to remove metal oxide film surface and greasy dirt.In TA1/Q235B ply-metal titanium plates one side
Laser backing welding is carried out at docking, using IPG YLS-4000 model optical fiber lasers, with laser power P=4kW, speed of welding
V=5m/min, defocusing amount f=0mm, the welding parameter of laser beam inclination angle alpha=5 ° carry out laser backing welding.It is welded into bottoming
Shape weld seam lower surface is with P=2.5kW, v=3m/min, f=+5mm, α=5 ° and wire feed rate s=4.2m/min, wire feed angle beta
=60 ° of welding parameter carries out laser and fills out titanium welding wire back cover.Afterwards, laser is carried out in backing welding formed weld upper surface and fills out molybdenum weldering
The mode landfill transition zone of silk built-up welding, wherein P=2.5kW, v=3m/min, f=+7mm, α=5 °, s=2.8m/min, β=
60 °, double V-groove bottom can be filled by ensureing the molybdenum transition zone weld seam of landfill, and base steel layer and titanium layer are completely cut off completely.In transition zone
Weld seam upper surface continue landfill steel welding wire, parameter used in first layer steel welding bead be P=3.8kW, v=5m/min, f=+7mm, α=
5 °, s=3.4m/min, β=60 ° ensure that the fusion penetration during landfill steel welding wire after molybdenum transition zone remelting is less than 0.2mm.Most
Afterwards, P=3.8kW, v=3m/min, f=+7mm, α=5 °, s=3.4m/min, the parameter progress multilayer multiple tracks of β=60 ° are taken
Laser fills out steel welding wire built-up welding until being fully filled with double V-groove.During laser fills out steel welding wire built-up welding, repeatedly with P=
2.8kW, v=3m/min, f=+10mm, the technological parameter of α=5 ° carry out remelting to obtain preferably interlaminar strength to steel welding bead
And seam center.
TA1/Q235B banjo fixing butt jointings seam center, alloying elements distribution and microhardness are observed and analyzed, is evaluated
The reasonability and feasibility of the content of the invention.It can be with from composite bimetal pipe laser lap welding point cross-sectional morphology (such as Fig. 4)
Find out, be about 2mm using the width of transition zone that the method for Laser Welding obtains weld seam by the use of molybdenum as transition zone, and in Ti/Mo/Fe tri-
The presence of type crackle is not extended through in intersection of area.According to Ti-Mo binary phase diagramls, Mo and Ti infinitely dissolves will not generate crisp
Property intermetallic compound, has preferably completely cut off titanium and steel and has formed good metallurgical binding.
From fig. 5, it can be seen that the near interface between Mo transition zones and Fe fill areas occurs one more significantly
" softened zone ", which is about 230HV, hence it is evident that less than the microhardness (about 370HV) of steel layer fusion zone.Fig. 6 and
Fig. 7 is that the ingredient of welding point and microhardness distribution are analyzed, and analysis is drawn：The presence of the softened region has beneficial to inhibition
The brittle cracking phenomenon that transition zone near zone occurs, and be conducive to inhibit the extension of crackle.
Comparative example 1
The welding that this comparative example provides the titanium steel composite board laser silk filling butt welding using T2 red coppers (Cu) as transition zone connects
Head, for welding method with embodiment 1, transition region cross-sectional morphology is as shown in Figure 8.In Fig. 8 regions I, the thickness in Cu interlayers
It is larger, it can be seen that postwelding is well combined in the region, is occurred without apparent crack defect.However in region II, copper/steel
The mixing of two kinds of materials of near interface is serious, and steel is easily directly mixed with lower floor titanium, is formed intermetallic compound, is caused welding point group
Penalty is knitted, can be seen in the figure that in copper transition region has that apparent crackle generates and crackle crosses entire transition zone region.
In region III, titanium steel contacts directly region and equally generates a degree of crackle tendency.
To sum up, crossed by the use of T2 red coppers as the titanium steel composite board laser filling wire welding of transition zone in titanium/steel/Tong Sanqu
Place is inevitably present with different degrees of mixing, causes the generation of Ti-Fe compounds, so as to crack.Meanwhile use copper
During as transition zone, in piling of steel welding wire in brazed seam, if the fusion penetration formed in brazed seam is excessive, then having very much in molten bath can
Ti, Cu, Fe can be existed simultaneously, the low melting point eutectics phase such as TiFe or CuTi is easily formed in subsequent cooling process, causes crackle
Generation.
Therefore, it is preferably excellent can be satisfied with titanium, steel base material compatibility for the welding method by the use of molybdenum (Mo) as transition zone
Gesture, while as refractory metal, influence of the remelting to interlayer region when can preferably avoid landfill steel welding wire.With Fig. 5 phases
Than preferably inhibiting the generation of titanium steel composite board Butt Joint transition zone crackle by the use of molybdenum as interlayer, improving weldering
The tissue and mechanical property of connector.
Claims (10)
- A kind of 1. method for inhibiting titanium-steel composite board Butt Joint transition zone crackle, which is characterized in that it is multiple to be included in titanium-steel Molybdenum transition zone weld seam is formed using the method for laser landfill molybdenum welding wire at plywood banjo fixing butt jointing.
- 2. inhibit the method for titanium-steel composite board Butt Joint transition zone crackle as described in claim 1, it is characterised in that：Step 1：Step surface (3) is formed between the titanium plate (1) of titanium-steel composite board and steel plate (2), steel plate one side is processed as inclined-plane (4), the oxide of metal surface is removed on the inclined-plane polished on step surface and steel plate, exposes metallic luster；Step 2：By two pieces by the docking of steps 1 treated titanium-steel composite board, the inclined-plane of the steel plate of titanium-steel composite board forms V Type groove；Laser backing welding forms backing weld seam (5) at the docking of titanium plate；Step 3：Back cover titanium wire bond seam (6) is formed using wire filling laser welding titanium silk back cover in the lower surface of backing weld seam (5)；Step 4：Molybdenum transition zone weld seam (7), molybdenum are formed using the method for laser landfill molybdenum welding wire in the upper surface of backing weld seam (5) Double V-groove bottom is completely covered in transition zone weld seam；Step 5：The surface that a layer weld seam (7) is crossed in molybdenum continues to form steel wire welding bead (8) using wire filling laser welding landfill steel welding wire, directly To double V-groove is filled up, the titanium-steel composite board of docking is obtained.
- 3. inhibit the method for titanium-steel composite board Butt Joint transition zone crackle as described in claim 1, it is characterised in that： The angle of the steel plate side double V-groove of pre- docking titanium-steel composite board is 20 °~40 °.
- 4. inhibit the method for titanium-steel composite board Butt Joint transition zone crackle as described in claim 1, it is characterised in that： The width for the backing weld seam (5) that laser backing welding shapes is less than 2mm in step 2.
- 5. inhibit the method for titanium-steel composite board Butt Joint transition zone crackle as described in claim 1, it is characterised in that： The width of back cover titanium wire bond seam (6) in step 3 is 2-4mm, and reinforcement is no more than 1.0mm.
- 6. inhibit the method for titanium-steel composite board Butt Joint transition zone crackle as described in claim 1, it is characterised in that： In step 4, laser beam incidence angle and vertical direction angle are 5 °~10 °, and wire feed angle and vertical direction angle are 60 °~70 °.
- 7. inhibit the method for titanium-steel composite board Butt Joint transition zone crackle as described in claim 1, it is characterised in that： In built-up welding molybdenum transition zone weld seam (7), titanium layer remelting depth is less than 0.5mm；During built-up welding steel wire welding bead (8), transition zone weld seam (7) The fusion penetration of remelting is less than 0.2mm.
- 8. inhibit the method for titanium-steel composite board Butt Joint transition zone crackle as described in claim 1, it is characterised in that： The length that titanium plate stretches out steel plate in step surface (3) is 1mm.
- 9. inhibit the method for titanium-steel composite board Butt Joint transition zone crackle as described in claim 1, it is characterised in that： Gap width in the two pieces of titanium-steel composite boards docked in advance between titanium plate (1) is less than 0.1mm.
- 10. inhibit the method for titanium-steel composite board Butt Joint transition zone crackle as described in claim 1, it is characterised in that： The titanium-steel composite board welds obtained metallurgical junction mould assembly layered bi-metal composite plate for explosion.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113070575A (en) * | 2021-04-09 | 2021-07-06 | 成都先进金属材料产业技术研究院股份有限公司 | Interlayer-free butt welding method and welding structure for bimetal composite plate |
| CN113857669A (en) * | 2021-10-22 | 2021-12-31 | 吉林大学 | Laser welding method for titanium alloy and aluminum alloy dissimilar materials |
| US20220080532A1 (en) * | 2018-10-25 | 2022-03-17 | Ihi Corporation | Joint method |
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