CN106392325B - A kind of method for laser welding of stainless steel thick-walled pressure vessel - Google Patents
A kind of method for laser welding of stainless steel thick-walled pressure vessel Download PDFInfo
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- CN106392325B CN106392325B CN201611013192.5A CN201611013192A CN106392325B CN 106392325 B CN106392325 B CN 106392325B CN 201611013192 A CN201611013192 A CN 201611013192A CN 106392325 B CN106392325 B CN 106392325B
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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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/08—Devices involving relative movement between laser beam and workpiece
- B23K26/082—Scanning systems, i.e. devices involving movement of the laser beam relative to the laser head
-
- 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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/12—Vessels
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- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Laser Beam Processing (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The present invention provides a kind of method for laser welding of stainless steel thick-walled pressure vessel, the pressure vessel includes high pressure tank body, low pressure buffer pressure vessel and pipeline, and the high pressure tank body uses solution strengthening or ageing strengthening stainless steel material；The circumferential weld of junction is continuously welded using laser between the high pressure tank body and low pressure buffer pressure vessel, and the continuous welding parameter of the circumferential weld includes：When the tank body wall thickness is 5mm~10mm, 4.2~7.5KW of laser power, 0.8~1.5m/min of speed of welding, defocusing amount -2mm~3mm, 15~25L/min of protection air-flow amount.The present invention solves the problems, such as weld strength of the high-strength stainless steel material under solid solution or age strengthened temper, and weld strength is high and stablizes, and realize base material waits strong ties.
Description
Technical field
Welding technology field more particularly to a kind of laser of stainless steel thick-walled pressure vessel the invention belongs to pressure vessel
Welding method.
Background technology
Manufacture is formed frequently with arc fusion welding multilayer, multi-pass welding in thick-walled pressure vessel at present, and pressure vessel is normal
Using high-strength stainless steel materials such as solution strengthening, ageing strengthenings as main body, after usually this material welding, to prevent weld seam
Softening, which occurs, with heat affected area material will be modulated processing, but this device inside contains spring part, sealing surface etc., therefore welds
It cannot be heat-treated after connecing, must first carry out modifier treatment to meet intensity requirement carries out welding fabrication again.And modulation condition
Under high-strength material welding strictly to control welding parameter, and when the arc fusion welding that the prior art uses welds this kind of material,
There are weld strength it is relatively low, be also easy to produce crackle, forming accuracy is poor the problems such as.
Invention content
For the above problem of the prior art, it is a primary object of the present invention to provide a kind of stainless steel heavy walled pressure to hold
The method for laser welding of device solves the problems, such as weld strength of the high-strength stainless steel material under solid solution or age strengthened temper,
Weld strength is high and stablizes, and realize base material waits strong ties.
In order to achieve the above object, the present invention adopts the following technical scheme that：A kind of laser of stainless steel thick-walled pressure vessel
Welding method, the pressure vessel include high pressure tank body, low pressure buffer pressure vessel and pipeline, and the high pressure tank body is using solid solution
Reinforcing or ageing strengthening stainless steel material；
The circumferential weld of junction is continuously welded using laser between the high pressure tank body and low pressure buffer pressure vessel, the ring
The continuous welding parameter of seam includes：
The tank body wall thickness be 5mm~10mm when, 4.2~7.5KW of laser power, 0.8~1.5m/min of speed of welding, from
Burnt amount -2mm~3mm, 15~25L/min of protection air-flow amount.
As a further preference, the continuous welding parameter of the circumferential weld includes：
A, when tank body wall thickness be 5mm~6mm when, 4.2~4.8KW of laser power, 1.2~1.5m/min of speed of welding, from
Burnt amount -1mm~2mm, 15~25L/min of protection air-flow amount；
B, when tank body wall thickness be 6mm~7mm when, 4.7~5.4KW of laser power, 1.0~1.3m/min of speed of welding, from
Burnt amount -1.5mm~2.5mm, 15~25L/min of protection air-flow amount；
C, when tank body wall thickness be 7mm~8mm when, 5.2~6.0KW of laser power, 0.8~1.2m/min of speed of welding, from
Burnt amount -2mm~3mm, 15~25L/min of protection air-flow amount；
D, when tank body wall thickness be 8mm~9mm when, 5.8~6.6KW of laser power, 0.8~1.2m/min of speed of welding, from
Burnt amount -2mm~3mm, 15~25L/min of protection air-flow amount；
E, when tank body wall thickness be 9mm~10mm when, 6.5~7.5KW of laser power, 0.8~1.2m/min of speed of welding, from
Burnt amount -2mm~3mm, 15~25L/min of protection air-flow amount.
As a further preference, the pressure vessel includes high pressure tank body, head cover body, cover board, conduit and pressure inlet, institute
It states head cover body and includes the head cover being connect with the tank body one end fits and low pressure buffer container, the low pressure buffer one end
It is connect with the head cover, the other end is connected with the cover board；The low pressure of the tube at one end and the low pressure buffer container
Gas outlet connects, and the other end is connect with the pressure inlet；The tank body is stainless using solution strengthening or ageing strengthening with head cover body
Steel material；The tank body is continuously welded with the circumferential weld at head cover mating connection using laser.
As a further preference, during the girth welding, in 3~10mm before laser welding gun reaches welding end point,
Carry out bonding power attenuation.
As a further preference, during the girth welding, girth joint receives arc position and is equipped with overlapping region with playing welding position, institute
It is 10~15mm of length to state overlapping region.
As a further preference, before the continuous girth weld of the laser, at the tank body and head cover mating connection
Laser positioning welding is carried out, the parameter of the laser positioning welding is：2.0~3.5KW of laser power, speed of welding 1.5~
3.0m/min, defocusing amount -1mm~+1mm, protection air-flow 10~15L/min of amount, 5~7mm long of tack weld, spacing 25mm~
30mm。
As a further preference, the low pressure buffer container is with using laser sequential welding at the cover board mating connection
It connects, the continuous welding parameter of laser includes：
When cover sheet thickness is 2mm~4mm, 1.6~3.5KW of laser power, 1.0~1.5m/min of speed of welding, defocus
Amount -1.5mm~2.5mm, 15~25L/min of protection air-flow amount.
As a further preference, the low pressure buffer container and the continuous welding parameter packet of laser at cover board mating connection
It includes：
A, when cover sheet thickness be 2mm~3mm when, 1.6~2.5KW of laser power, 1.2~1.5m/min of speed of welding, from
Burnt amount -1mm~2mm, 15~25L/min of protection air-flow amount；
B, when tank body wall thickness be 3mm~4mm when, 2.4~3.5KW of laser power, 1.0~1.5m/min of speed of welding, from
Burnt amount -1.5mm~2.5mm, 15~25L/min of protection air-flow amount.
As a further preference, laser sequential welding is used at the low pressure buffer container and the cover board mating connection
Before connecing, the low pressure buffer container at the cover board mating connection using positioning welding, the technique of the positioning welding with being joined
Number includes：0.8~1.5KW of laser power, 1.5~3.0m/min of speed of welding, defocusing amount -1mm~+1mm, protection air-flow amount
10~15L/min, 3~6mm long of tack weld, spacing 20mm~25mm；Tack welding weld penetration is the 1/3 of the cover sheet thickness
~1/2.
As a further preference, fillet welding is used between the conduit and pressure inlet and the conduit and low pressure gas outlet
Seam is welded, and the welding parameter of the fillet weld includes：0.5~0.8KW of pulsed laser power, 0.3~0.5m/ of speed of welding
Min, it defocusing amount -0.5mm~+0.5mm, pulse frequency 80Hz~100Hz, duty ratio 15~30%, 45 ° of incidences of laser beam, protects
Protect 10~15L/min of throughput.
As a further preference, after the girth welding at the tank body and head cover mating connection, using laser heating pair
Circumferential weld is heat-treated, and processing parameter includes：Laser power is 1/5~1/4,0.3~0.4m/min of speed of bonding power, from
Burnt amount+20mm~+25mm, spot diameter φ 2mm~φ 3mm, 15~25L/min of protection air-flow amount.
As a further preference, circumferential weld lock base frame rank and circumferential weld benefit are additionally provided at the tank body and head cover mating connection
Strong step.
As a further preference, the head cover includes and the strengthening of welded seam step and high pressure at the tank body cooperation
Outlet interface, the high pressure outlet air interface and the tank interior unicom.
As a further preference, the low pressure buffer container be opening box body, the side of the low pressure buffer container
Wall is machined with to be opened with the low-pressure admission mouth and low pressure gas outlet, the low pressure buffer container connected inside the low pressure buffer container
The lock base frame rank coordinated with the cover board is provided on the inside of mouthful.
As a further preference, the pressure rating of the pressure vessel is 40-60MPa.
The beneficial effects of the invention are as follows：
(1) the high pressure tank body of thick-walled pressure vessel of the present invention uses solution strengthening or ageing strengthening stainless steel with head cover body
Material；The circumferential weld of junction is continuously welded using laser between the high pressure tank body and low pressure buffer container, and there is provided reasonable
Laser welding process parameter, solve the problems, such as weld strength of the superhigh strength stainless steel material under solid solution or aged,
The defects of weld seam hot-zone influences intensity, toughness without reduction, flawless, stomata, realize base material etc. strong ties.
(2) present invention solves Laser Deep Penetration Welding and receives crater defects, ensure high pressure-volume by rational power attenuation sequential
The intensity and air-tightness of device.
(3) design for the lock joint forms such as base frame rank and reinforcement step that the present invention passes through each device junction, avoids
The possibility of the fifth wheels such as the splashing that laser welding generates inside container, while also ensure welding positioning accuracy.
(4) to ensure tank body high voltage intensity and air-tightness requirement, girth joint of the present invention receives arc position and is equipped with weight with playing welding position
Folded region, in addition at the end of Laser Deep Penetration Welding, directly turning off laser can be there are larger receipts arc crater, and influencing tank body air-tightness will
It asks, and the present invention just carries out bonding power attenuation before laser welding gun reaches welding end point, and welding is made to receive arc process by melting deeply
Weldering gradually welds to heat transfer and carries out smooth transition, and weld penetration is progressively smaller until to be zero, completes no keyhole and receives arc.
Description of the drawings
Fig. 1 is the structure diagram of 1 stainless steel thick-walled pressure vessel of the embodiment of the present invention；
Fig. 2 is the structure diagram of tank body in Fig. 1；
Fig. 3 is the structure diagram of head cover body and low pressure buffer pressure vessel in Fig. 1；
Fig. 4 is the structure diagram of the cover board of Fig. 3 mesolow compensator or trimmer pressure containers；
Fig. 5 is the structure diagram of pressure inlet in Fig. 1；
Fig. 6 is the welding groove form schematic diagram of tank body in Fig. 1；
Fig. 7 is the welding groove form schematic diagram of Fig. 1 mesolow compensator or trimmer pressure containers.
What is marked in attached drawing is described as follows：1st, tank body, 2, head cover body, 3, cover board, 4, conduit, 5, pressure inlet, 1-1, filling
Ozzle, 1-2, circumferential weld lock base frame rank, 1-3, circumferential weld reinforcement step, 1-4, check valve, 2-1, head cover, 2-3, low pressure buffer
Container, 2-1-1, strengthening of welded seam step, 2-1-2, high pressure outlet air interface, 2-3-1, low-pressure admission mouth are 2-3-2, low
Gas port is extruded, 2-3-3, cover board lock base frame rank,
Specific embodiment
It is stainless to solve superhigh intensity by providing a kind of method for laser welding of stainless steel thick-walled pressure vessel by the present invention
Weld strength and problems of welded quality of the Steel material under solid solution or age strengthened temper.
In order to solve drawbacks described above, the main thought of the embodiment of the present invention is：
The method for laser welding of stainless steel thick-walled pressure vessel of the embodiment of the present invention, the pressure vessel include pressure pan
Body, head cover body, cover board, conduit and pressure inlet, the head cover body include the head cover that is connect with the high pressure tank body one end fits with
And low pressure buffer container, the low pressure buffer one end are connect with the head cover, the other end is connected with the cover board；Institute
The low pressure gas outlet that tube at one end is stated with the low pressure buffer container is connect, and the other end is connect with the pressure inlet；The high pressure
Tank body uses solution strengthening or ageing strengthening stainless steel material with head cover body；
The high pressure tank body is continuously welded with the circumferential weld at head cover mating connection using laser, the continuous welding of the circumferential weld
Parameter includes：
The tank body wall thickness be 5mm~10mm when, 4.2~7.5KW of laser power, 0.8~1.5m/min of speed of welding, from
Burnt amount -2mm~3mm, 15~25L/min of protection air-flow amount.
Pressure vessel of the embodiment of the present invention is usually this using high intensity, ageing strengthening martensite stainless steel material
After material welding, processing is modulated to prevent weld seam and heat affected area material from softening occurs, but this device inside contains
Spring part, sealing surface, thus weld after cannot be heat-treated, for meet intensity requirement must advance modifier treatment carry out again
Welding fabrication.High-strength material welding under modulation condition will strictly control weld heat input：Such as weld heat input is excessively high, connects
Head easily softens, and intensity is unsatisfactory for requiring；Weld heat input is too low, and martensite content is higher in weld seam, crackle tendency compared with
Greatly.Therefore welding parameter matching is important.And the welding parameter of junction between element each in pressure vessel of the embodiment of the present invention
Rational setting has been carried out, weld strength of the superhigh strength stainless steel material under solid solution or age strengthened temper has been solved and asks
Topic, realize base material waits strong ties.
In addition, big thickness material laser welding is typically to be welded using Laser Deep Penetration Welding pattern, it is larger for obtaining
Fusion penetration, since air pressure is higher in keyhole during deep penetration welding, spatter can be inevitably generated in back of weld.The present invention is implemented
Example thick-walled pressure vessel air inlet is check valve, gas outlet diameter only has 1mm, can not possibly be cleaned after welding fabrication, be anti-
Only the fifth wheels such as spatter enter container intracavity, and the present invention devises lock bottom inner lining structure (and for accurately filling
With positioning), weld penetration is strictly controlled by technological parameter in welding process so that weld penetration is just in lock base frame rank
Portion should ensure to penetrate effectively carrying depth, and be unlikely to completely penetrate through lock base frame rank, and spatter is caused to enter in container
Chamber.
Also need to consider, laser beam is thinner, and the weld seam of formation is relatively narrow, when throat thickness is larger, may there are because
Laser beam deviate opposite joint center or with weld seam normal it is misaligned when, cause back of weld generate incomplete fusion defect generation, therefore
The embodiment of the present invention adjusts a degree of increase weld pool width of technological parameter, and guarantee has certain process margin.
The molding of pressure vessel of the embodiment of the present invention generally includes the components such as tank body, head cover body, cover board, conduit and pressure inlet
Processing, welding groove processing, component assembling, circular seams of tank body welding, low pressure buffer container cover plate welding, pipeline welding etc. steps
Suddenly, the step of postwelding laser heat treatment can also be set.
The pressure limit of high pressure described in the embodiment of the present invention is 40-60MPa, and the pressure limit of the low pressure is 2-5MPa.
Above and other purpose, feature and advantage in order to allow the present invention can be clearer and more comprehensible, and number cited below particularly is implemented
Example, to illustrate the method for laser welding of stainless steel thick-walled pressure vessel of the present invention.
Embodiment 1
Thick-walled pressure vessel of the embodiment of the present invention includes tank body, head cover body, cover board, conduit and pressure inlet, the head cover body
Including the head cover being connect with the tank body one end fits and low pressure buffer container, the low pressure buffer one end and the top
Lid connection, the other end are connected with the cover board；The low pressure gas outlet of the tube at one end and the low pressure buffer container connects
It connects, the other end is connect with the pressure inlet；The tank body uses solution strengthening or ageing strengthening stainless steel material with head cover body.
Processing, assembling and the welding fabrication step of thick-walled pressure vessel of the embodiment of the present invention, specifically include as follows：
(1) component processing step：
As shown in Figure 1, this superhigh strength stainless steel thick-walled pressure vessel by tank body 1, head cover body 2, cover board 3, conduit 4, connect
Ozzle 5 forms.
1) component processing
The tank body 1 is using 0Cr17Ni4Cu4Nb ageing strengthenings stainless steel or 20Cr13 solution strengthening stainless steel forgings warm
After processing, whole machinery shapes, and machining feature includes fill nozzle 1-1, circumferential weld lock base frame rank 1-2, circumferential weld reinforcement
Step 1-3, as shown in Figure 2；Tank body wall thickness, fill nozzle are processed according to design size；To ensure welding positioning accuracy and preventing
Spatter is only generated in welding process inside container, increases circumferential weld lock base frame rank 1-2；Connector to ensure girth joint is strong
Degree, devises compensation joint 1-3.Check valve 1-4 is sub-assembly, is composed of spool, spring assembly and lock nut.
The head cover body 2 is shaped using the material entirety machinery identical with tank body 1, as shown in figure 3, its agent structure
It is formed including high pressure tank body head cover 2-1 and low pressure buffer container 2-3 two parts, high pressure tank body head cover 2-1 acts not only as high pressure
The head cover of tank body or the bottom plate of low pressure buffer container 2-3.High pressure tank body head cover 2-1 machining features include and 1 pairing of tank body
The strengthening of welded seam step 2-1-1 at place and high pressure outlet air interface 2-1-2, high pressure outlet air interface bottom have the circular hole of φ 2 with
1 unicom of high pressure tank body, outside are the hickey of M10 depths 10mm.
As shown in figure 3, the low pressure buffer container 2-3 is the box body of opening, side wall is machined with low-pressure admission mouth 2-
3-1 and low pressure gas outlet 2-3-2 and cover board lock base frame rank 2-3-3.Low-pressure admission mouth 2-3-2 bottoms have φ's 2
Circular hole and low pressure buffer container 2-3 unicom, outside are the hickey of M10 depths 10mm；Low pressure gas outlet 2-3-2 bottoms have
The circular hole of φ 2 and low pressure buffer container 2-3 unicom, outside are the circular hole depth 4mm of φ 3, with conduit 4 that outer diameter is φ 3 into luggage
With welding；Cover board locks base frame rank 2-3-3 on the inside of low pressure buffer vessel port, and with 3 thickness of cover board always, width is depth
1mm, step quadrangle wedge angle are processed as R3 fillets, and step needs to carry out back chipping processing.
As shown in figure 4, the cover board 3, is same material with tank body 1, appearance and size is assisted with cover board lock base frame rank 2-3-3
Processing is adjusted, sharp edge does not allow blunt, it is desirable that be not more than 0.1mm with cover board lock base frame rank 2-3-3 gap clearances.
The conduit 4 for 3 × 1 standard tubing of φ with 1 material identical of tank body, intercepts, it is desirable that both ends according to design length
The smooth impulse- free robustness in face.
As shown in figure 5, the pressure inlet 5, uses and shaped with tank body 1 for the bar of same material, outer circle 5-1 is
M10 screw threads；Circular hole 5-2 apertures are identical with 4 outer diameter of conduit, deep 5~8mm；2~3mm of section of stretching out 5-3 thickness, 3~6mm of length,
After 4 grafting of conduit, welded using fillet weld.
2) welding groove is processed
The circumferential weld lock base frame rank 1-2, circumferential weld reinforcement step 1-3 and 2-1-1 processing dimension as shown in Figure 6, lock bottom
Step dimension 1-2 thickness a=0.8~1.0mm, length b=0.8~1.0mm；Circumferential weld reinforcement step 1-3 and 2-1-1 height c
=1.0mm, length d=2~3mm, into θ angle and tank body (or head cover body) outer surface even transition, θ=135 °~150 °.Head cover
Body 2 and 1 apposition position inwall processing a × b notches of tank body ensure that head cover body 2 is not more than 0.1mm with 1 gap clearance of tank body.
(2) component assembles
The tank body 1 is with 2 installation step of head cover body：Circumferential weld lock base frame rank on tank body 1 is inserted into 2 circle of head cover body to open
In mouthful, involutory surface gap is made to be less than 0.1mm.
The cover board 3 is with low pressure buffer container 2-3 installation steps：Cover board 3 is embedded in cover board lock base frame rank 2-3-3,
Cover board 3 is flushed with low pressure buffer container 2-3 open circumferentials, and step difference is not more than 0.1mm.
The conduit 4 is with low pressure buffer container 2-3 installation steps：Low pressure gas outlet 2-3- is inserted into 4 one end of conduit
2, insertion depth about 4mm.
The conduit 4 is with 5 installation step of pressure inlet：4 other end of conduit is inserted on pressure inlet 5 in circular hole 5-2, is inserted
Enter depth for 5~8mm.
(3) circular seams of tank body welds
1) tank body positioning welding
Tank body positioning welding technological parameter is：2.0~3.5KW of laser power, 1.5~3.0m/min of speed of welding, defocus
Amount -1mm~+1mm, protection air-flow 10~15L/min of amount, 5~7mm long of tack weld, spacing 25mm~30mm.Tack welding welds
Stitch 1/3~1/2 that depth is tank body thickness, solder joint width is unsuitable wide, therefore speed of welding be not easy it is too low.
2) circular seams of tank body continuously welds
Circular seams of tank body continuous welding process parameter is：
The tank body wall thickness be 5mm~10mm when, 4.2~7.5KW of laser power, 0.8~1.5m/min of speed of welding, from
Burnt amount -2mm~3mm, 15~25L/min of protection air-flow amount.
(4) low pressure buffer container cover plate welds
1) low pressure buffer container cover plate positioning welding
Positioning welding technological parameter is：0.8~1.5KW of laser power, 1.5~3.0m/min of speed of welding, defocusing amount-
1mm~+1mm, protection air-flow 10~15L/min of amount, 3~6mm long of tack weld, spacing 20mm~25mm.It is deep to position welding line
Spend 1/3~1/2 for cover sheet thickness, solder joint width is unsuitable wide, therefore speed of welding be not easy it is too low.
2) low pressure buffer container cover plate continuously welds
Continuous welding process parameter is：
When cover sheet thickness is 2mm~4mm, 1.6~3.5KW of laser power, 1.0~1.5m/min of speed of welding, defocus
Amount -1.5mm~2.5mm, 15~25L/min of protection air-flow amount.
(5) pipeline welds
Conduit 4 is welded with pressure inlet 5 and conduit 4 and low pressure gas outlet 2-3-2 using fillet weld.Due to conduit
Diameter is small, wall thickness is thin, is advisable using narrow-pulse laser, low weldering speed, to prevent pipe inner wall fusing from blocking.Welding parameter
For：0.5~0.8KW of laser power, 0.3~0.5m/min of speed of welding, defocusing amount -0.5mm~+0.5mm, pulse frequency
80Hz~100Hz, duty ratio 15~30%, 45 ° of incidences of laser beam, 10~15L/min of protection air-flow amount.
Embodiment 2
2 difference from Example 1 of embodiment is：
Circular seams of tank body continuous welding process parameter is：
A, when tank body wall thickness be 5mm~6mm when, 4.2~4.8KW of laser power, 1.2~1.5m/min of speed of welding, from
Burnt amount -1mm~2mm, 15~25L/min of protection air-flow amount；
B, when tank body wall thickness be 6mm~7mm when, 4.7~5.4KW of laser power, 1.0~1.3m/min of speed of welding, from
Burnt amount -1.5mm~2.5mm, 15~25L/min of protection air-flow amount；
C, when tank body wall thickness be 7mm~8mm when, 5.2~6.0KW of laser power, 0.8~1.2m/min of speed of welding, from
Burnt amount -2mm~3mm, 15~25L/min of protection air-flow amount；
D, when tank body wall thickness be 8mm~9mm when, 5.8~6.6KW of laser power, 0.8~1.2m/min of speed of welding, from
Burnt amount -2mm~3mm, 15~25L/min of protection air-flow amount；
E, when tank body wall thickness be 9mm~10mm when, 6.5~7.5KW of laser power, 0.8~1.2m/min of speed of welding, from
Burnt amount -2mm~3mm, 15~25L/min of protection air-flow amount；
To ensure the requirement of tank body high voltage intensity and air-tightness, girth joint receive arc position should with rise a welding position be equipped with one section it is Chong Die
Region, 10~15mm of overlap length are advisable；At the end of Laser Deep Penetration Welding, directly laser can there are larger receipts arc crater, shadows for shutdown
The requirement of tank body air-tightness is rung, in 3~10mm before laser welding gun reaches welding end point, should just carry out bonding power attenuation,
Welding is made to receive arc process, progress smooth transition is gradually welded to heat transfer from deep penetration welding, weld penetration is progressively smaller until to be zero, completes
No keyhole receives arc.
Low pressure buffer container is with the technological parameter that cover board continuously welds：
A, when cover sheet thickness be 2mm~3mm when, 1.6~2.5KW of laser power, 1.2~1.5m/min of speed of welding, from
Burnt amount -1mm~2mm, 15~25L/min of protection air-flow amount；
B, when tank body wall thickness be 3mm~4mm when, 2.4~3.5KW of laser power, 1.0~1.5m/min of speed of welding, from
Burnt amount -1.5mm~2.5mm, 15~25L/min of protection air-flow amount；
To ensure tank body high voltage intensity and air-tightness requirement, girth joint overlap length receives arc attenuation and length requirement and tank
Body welding requirements is consistent.
When pipeline welds, weld seam 1~2mm of overlap length, being welded using narrow-pulse laser is allowed without receiving arc work(
Rate attenuation process.
The embodiment of the present invention 2 is also provided with postwelding laser heat treatment step：
Tank body 1 uses solution strengthening or ageing strengthening superhigh strength stainless steel material with head cover body 2, and wall thickness is larger, swashs
Flush weld seam cooling velocity is very fast, and weld seam crisp tendency of quenching is larger, is susceptible to crackle, postwelding needs to carry out stress relief annealing at once.
But check valve assembly is arranged at 1 bottom of tank body, it is impossible to carry out post weld heat treatment, therefore carry out hot place to weld seam using laser heating
Reason, technological parameter are as follows：
Laser power be bonding power 1/5~1/4,0.3~0.4m/min of speed, defocusing amount+20mm~+25mm, light
Spot diameter φ 2mm~φ 3mm, 15~25L/min of protection air-flow amount.
Technical solution in above-mentioned the embodiment of the present application, at least has the following technical effect that or advantage：
Although preferred embodiments of the present invention have been described, but those skilled in the art once know basic creation
Property concept, then additional changes and modifications may be made to these embodiments.So appended claims be intended to be construed to include it is excellent
It selects embodiment and falls into all change and modification of the scope of the invention.Obviously, those skilled in the art can be to the present invention
Carry out various modification and variations without departing from the spirit and scope of the present invention.If in this way, these modifications and changes of the present invention
Belong within the scope of the claims in the present invention and its equivalent technologies, then the present invention is also intended to exist comprising these modification and variations
It is interior.
Claims (9)
1. a kind of method for laser welding of stainless steel thick-walled pressure vessel, it is characterised in that：The pressure vessel includes pressure pan
Body, low pressure buffer pressure vessel and pipeline, the high pressure tank body use solution strengthening or ageing strengthening stainless steel material；The height
The circumferential weld of junction is continuously welded using laser between pressure tank body and low pressure buffer pressure vessel, the continuous welding ginseng of the circumferential weld
Number includes：
The high pressure tank wall thickness be 5mm~10mm when, 4.2~7.5KW of laser power, 0.8~1.5m/min of speed of welding, from
Burnt amount -2mm~3mm, 15~25L/min of protection air-flow amount；
A, when high pressure tank wall thickness be 5mm~6mm when, 4.2~4.8KW of laser power, 1.2~1.5m/min of speed of welding, from
Burnt amount -1mm~2mm, 15~25L/min of protection air-flow amount；
B, when high pressure tank wall thickness be 6mm~7mm when, 4.7~5.4KW of laser power, 1.0~1.3m/min of speed of welding, from
Burnt amount -1.5mm~2.5mm, 15~25L/min of protection air-flow amount；
C, when high pressure tank wall thickness be 7mm~8mm when, 5.2~6.0KW of laser power, 0.8~1.2m/min of speed of welding, from
Burnt amount -2mm~3mm, 15~25L/min of protection air-flow amount；
D, when high pressure tank wall thickness be 8mm~9mm when, 5.8~6.6KW of laser power, 0.8~1.2m/min of speed of welding, from
Burnt amount -2mm~3mm, 15~25L/min of protection air-flow amount；
E, when high pressure tank wall thickness be 9mm~10mm when, 6.5~7.5KW of laser power, 0.8~1.2m/min of speed of welding, from
Burnt amount -2mm~3mm, 15~25L/min of protection air-flow amount.
2. the method for laser welding of stainless steel thick-walled pressure vessel according to claim 1, it is characterised in that：The pressure
Container includes high pressure tank body, head cover body, cover board, conduit and pressure inlet, and the head cover body includes matching with described high pressure tank body one end
Close connection head cover and low pressure buffer container, the low pressure buffer one end connect with the head cover, the other end with it is described
Cover board is connected；The tube at one end is connect with the low pressure gas outlet of the low pressure buffer container, and the other end is taken over described
Mouth connects；The high pressure tank body uses solution strengthening or ageing strengthening stainless steel material with head cover body；The high pressure tank body and top
Circumferential weld at lid mating connection is continuously welded using laser.
3. the method for laser welding of stainless steel thick-walled pressure vessel according to claim 2, it is characterised in that：Swash described
Before the continuous girth weld of light, the tank body is with carrying out laser positioning welding, the laser positioning welding at head cover mating connection
Parameter be：2.0~3.5KW of laser power, 1.5~3.0m/min of speed of welding, defocusing amount -1mm~+1mm, protection air-flow amount
10~15L/min, 5~7mm long of tack weld, spacing 25mm~30mm.
4. the method for laser welding of stainless steel thick-walled pressure vessel according to claim 2, it is characterised in that：The low pressure
With continuously being welded using laser at the cover board mating connection, the continuous welding parameter of laser includes buffer container：
When cover sheet thickness is 2mm~4mm, 1.6~3.5KW of laser power, 1.0~1.5m/min of speed of welding, defocusing amount-
1.5mm~2.5mm, 15~25L/min of protection air-flow amount.
5. the method for laser welding of stainless steel thick-walled pressure vessel according to claim 4, it is characterised in that：The low pressure
Buffer container includes with the continuous welding parameter of laser at cover board mating connection：
A, when cover sheet thickness is 2mm~3mm, 1.6~2.5KW of laser power, 1.2~1.5m/min of speed of welding, defocusing amount-
1mm~2mm, 15~25L/min of protection air-flow amount；
B, when tank body wall thickness is 3mm~4mm, 2.4~3.5KW of laser power, 1.0~1.5m/min of speed of welding, defocusing amount-
1.5mm~2.5mm, 15~25L/min of protection air-flow amount.
6. the method for laser welding of stainless steel thick-walled pressure vessel according to claim 4, it is characterised in that：Described low
It presses before continuously being welded using laser at buffer container and the cover board mating connection, the low pressure buffer container and the cover board
Included at mating connection using positioning welding, the technological parameter of the positioning welding：0.8~1.5KW of laser power, speed of welding
1.5~3.0m/min, defocusing amount -1mm~+1mm, protection air-flow 10~15L/min of amount, 3~6mm long of tack weld, spacing
20mm~25mm；Tack welding weld penetration is the 1/3~1/2 of the cover sheet thickness.
7. the method for laser welding of stainless steel thick-walled pressure vessel according to claim 2, it is characterised in that：The conduit
It is welded between pressure inlet and the conduit and low pressure gas outlet using fillet weld, the welding parameter packet of the fillet weld
It includes：0.5~0.8KW of pulsed laser power, 0.3~0.5m/min of speed of welding, defocusing amount -0.5mm~+0.5mm, pulse frequency
80Hz~100Hz, duty ratio 15~30%, 45 ° of incidences of laser beam, 10~15L/min of protection air-flow amount.
8. the method for laser welding of stainless steel thick-walled pressure vessel according to claim 2, it is characterised in that：The tank body
After the girth welding at head cover mating connection, circumferential weld is heat-treated using laser heating, processing parameter includes：Laser work(
Rate be bonding power 1/5~1/4,0.3~0.4m/min of speed, defocusing amount+20mm~+25mm, spot diameter15~25L/min of protection air-flow amount.
9. the method for laser welding of stainless steel thick-walled pressure vessel according to claim 2, it is characterised in that：The tank body
With being additionally provided with circumferential weld lock base frame rank and circumferential weld reinforcement step at head cover mating connection.
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| CN110328448A (en) * | 2019-07-12 | 2019-10-15 | 武汉钢铁有限公司 | A kind of method for laser welding that can eliminate hot rolling δ-TRIP steel bead crack |
| CN110340528B (en) * | 2019-07-16 | 2021-07-06 | 湖北三江航天江北机械工程有限公司 | Welding method for airborne small rocket shell |
| CN110518269A (en) * | 2019-08-27 | 2019-11-29 | 浙江锋源氢能科技有限公司 | The welding method of fuel battery metal double polar plate |
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