CN106392325A - Laser welding method for stainless steel thick-wall pressure container - Google Patents
Laser welding method for stainless steel thick-wall pressure container Download PDFInfo
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- CN106392325A CN106392325A CN201611013192.5A CN201611013192A CN106392325A CN 106392325 A CN106392325 A CN 106392325A CN 201611013192 A CN201611013192 A CN 201611013192A CN 106392325 A CN106392325 A CN 106392325A
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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 invention provides a laser welding method for a stainless steel thick-wall pressure container. The pressure container comprises a high-pressure tank, a low-pressure buffering pressure container and a pipeline. Solution strengthening or ageing strengthening stainless steel materials are adopted in the high-pressure tank. A circular seam at the connecting position between the high-pressure tank and the low-pressure buffering pressure container is continuously welded through a laser. According to continuous welding parameters of the circular seam, when the tank wall thickness ranges from 5 mm to 10 mm, the laser power ranges from 4.2 KW to 7.5 KW, the welding speed ranges from 0.8 m/min to 1.5 m/min, the defocusing amount ranges from -2 mm to 3 mm, and the protection gas flow ranges from 15 L/min to 25 L/min. According to the laser welding method, the problem about welding strength of the high-strength stainless steel materials in a solution or ageing strengthening state is solved, the welding strength is high and stable, and equal-strength connection of base metal is achieved.
Description
Technical field
The invention belongs to the welding technology field of pressure vessel, more particularly, to a kind of laser of rustless steel thick-walled pressure vessel
Welding method.
Background technology
Thick-walled pressure vessel forms manufacture frequently with arc fusion welding multilamellar, multi-pass welding at present, and pressure vessel is normal
Using high-strength stainless steel materials such as solution strengthening, ageing strengthenings as main body, after generally this material welding, for preventing weld seam
Occur softening will be modulated processing with heat affected area material, but this device inside contains spring part, sealing surface etc., therefore welds
Heat treatment can not be carried out after connecing, carry out welding fabrication again for meeting intensity requirement and must first carry out modifier treatment.And modulation condition
Under high-strength material welding to strictly control welding parameter, and when the arc fusion welding that prior art adopts welds this kind of material,
Have such problems as that weld strength is relatively low, be also easy to produce crackle, forming accuracy poor.
Content of the invention
For the problems referred to above of the prior art, present invention is primarily targeted at providing a kind of rustless steel heavy walled pressure to hold
The method for laser welding of device, solves the problems, such as weld strength under solid solution or age strengthened temper for the high-strength stainless steel material,
Weld strength high and stable it is achieved that mother metal etc. strong ties.
In order to achieve the above object, the present invention adopts the following technical scheme that：A kind of laser of rustless steel thick-walled pressure vessel
Welding method, described pressure vessel includes high pressure tank body, low pressure buffer pressure vessel and pipeline, and described high pressure tank body adopts solid solution
Strengthening or ageing strengthening stainless steel material；
Between described high pressure tank body and low pressure buffer pressure vessel, the circumferential weld of junction is continuously welded using laser, described ring
The continuous welding parameter of seam includes：
Described tank body wall thickness be 5mm～10mm when, laser power 4.2～7.5KW, speed of welding 0.8～1.5m/min, from
Burnt amount -2mm～3mm, shielding gas flow 15～25L/min.
As further, preferably, the continuous welding parameter of described circumferential weld includes：
A, when tank body wall thickness be 5mm～6mm when, laser power 4.2～4.8KW, speed of welding 1.2～1.5m/min, from
Burnt amount -1mm～2mm, shielding gas flow 15～25L/min；
B, when tank body wall thickness be 6mm～7mm when, laser power 4.7～5.4KW, speed of welding 1.0～1.3m/min, from
Burnt amount -1.5mm～2.5mm, shielding gas flow 15～25L/min；
C, when tank body wall thickness be 7mm～8mm when, laser power 5.2～6.0KW, speed of welding 0.8～1.2m/min, from
Burnt amount -2mm～3mm, shielding gas flow 15～25L/min；
D, when tank body wall thickness be 8mm～9mm when, laser power 5.8～6.6KW, speed of welding 0.8～1.2m/min, from
Burnt amount -2mm～3mm, shielding gas flow 15～25L/min；
E, when tank body wall thickness be 9mm～10mm when, laser power 6.5～7.5KW, speed of welding 0.8～1.2m/min, from
Burnt amount -2mm～3mm, shielding gas flow 15～25L/min.
As further, preferably, described pressure vessel includes high pressure tank body, top cover body, cover plate, conduit and pressure inlet, institute
State top cover and the low pressure buffer container that top cover body includes being connected, described low pressure buffer one end with described tank body one end fits
It is connected with described top cover, the other end is connected with described cover plate；Described tube at one end and the low pressure of described low pressure buffer container
Gas outlet connects, and the other end is connected with described pressure inlet；Described tank body and top cover body adopt solution strengthening or ageing strengthening stainless
Steel material；Described tank body is continuously welded using laser with the circumferential weld at the top cover place of being connected.
As further preferred, during described girth welding, before laser welding gun reaches welding end point during 3～10mm,
Carry out bonding power decay.
As further preferably, during described girth welding, girth joint is received arc position and is equipped with overlapping region with playing a welding position, institute
State overlapping region for length 10～15mm.
As further preferred, before the continuous girth weld of described laser, described tank body and top cover are connected place
Carry out laser positioning welding, the parameter of described laser positioning welding is：Laser power 2.0～3.5KW, speed of welding 1.5～
3.0m/min, defocusing amount -1mm～+1mm, shielding gas flow 10～15L/min, tack weld 5～7mm length, spacing 25mm～
30mm.
As further, preferably, described low pressure buffer container adopts laser sequential welding with the described cover plate place of being connected
Connect, the continuous welding parameter of described laser includes：
When cover sheet thickness is 2mm～4mm, laser power 1.6～3.5KW, speed of welding 1.0～1.5m/min, out of focus
Amount -1.5mm～2.5mm, shielding gas flow 15～25L/min.
As further preferred, described low pressure buffer container and cover plate are connected the laser continuous welding parameter bag at place
Include：
A, when cover sheet thickness is for 2mm～3mm, laser power 1.6～2.5KW, speed of welding 1.2～1.5m/min, from
Burnt amount -1mm～2mm, shielding gas flow 15～25L/min；
B, when tank body wall thickness be 3mm～4mm when, laser power 2.4～3.5KW, speed of welding 1.0～1.5m/min, from
Burnt amount -1.5mm～2.5mm, shielding gas flow 15～25L/min.
As further preferred, adopt laser sequential welding in described low pressure buffer container with the described cover plate place of being connected
Before connecing, described low pressure buffer container and the described cover plate place of being connected adopt positioning welding, the technique ginseng of described positioning welding
Number includes：Laser power 0.8～1.5KW, speed of welding 1.5～3.0m/min, defocusing amount -1mm～+1mm, shielding gas flow
10～15L/min, tack weld 3～6mm length, spacing 20mm～25mm；Tack welding weld penetration is the 1/3 of described cover sheet thickness
～1/2.
As further preferred, between described conduit and pressure inlet and described conduit and low pressure gas outlet, adopt fillet welding
Seam is welded, and the welding parameter of described angle welding includes：Pulsed laser power 0.5～0.8KW, speed of welding 0.3～0.5m/
Min, defocusing amount -0.5mm～+0.5mm, pulse frequency 80Hz～100Hz, dutycycle 15～30%, laser beam 45 ° of incidences, guarantors
Shield throughput 10～15L/min.
As further preferred, described tank body and top cover be connected place girth welding after, using LASER HEATING pair
Circumferential weld carries out heat treatment, and processing parameter includes：Laser power is 1/5～1/4, speed 0.3～0.4m/min of bonding power, from
Burnt amount+20mm～+25mm, spot diameter φ 2mm～φ 3mm, shielding gas flow 15～25L/min.
As further preferably, described tank body and the top cover place of being connected are additionally provided with circumferential weld lock base frame rank and circumferential weld is mended
Strong step.
As further, preferably, described top cover includes and the strengthening of welded seam step at described tank body cooperation, and high pressure
Give vent to anger interface, described high pressure outlet air interface and described tank interior UNICOM.
As further preferably, described low pressure buffer container is the box body of opening, the side of described low pressure buffer container
Wall is machined with and the low-pressure admission mouth connecting inside described low pressure buffer container and low pressure gas outlet, and described low pressure buffer container is opened
It is provided with the lock base frame rank with the cooperation of described cover plate inside mouthful.
As further preferably, the pressure rating of described pressure vessel is 40-60MPa.
The invention has the beneficial effects as follows：
(1) the high pressure tank body of thick-walled pressure vessel of the present invention and top cover body adopt solution strengthening or ageing strengthening stainless steel
Material；Between described high pressure tank body and low pressure buffer container, the circumferential weld of junction is continuously welded using laser, and is provided with rationally
Laser welding process parameter, solve the problems, such as weld strength under solid solution or aged for the superhigh strength stainless steel material,
Weld seam hot-zone impact intensity, toughness no reduce, the defect such as flawless, pore, achieve mother metal etc. strong ties.
(2) present invention is by rational power attenuation sequential, solves Laser Deep Penetration Welding and receives crater defects it is ensured that high pressure-volume
The intensity of device and air-tightness.
(3) present invention is by the design of the lock joint form such as base frame rank and reinforcement step of each device junction, it is to avoid
The possibility of the fifth wheels such as the splashing that laser welding produces inside container, also ensure that welding positioning precision simultaneously.
(4) it is to ensure that tank body high voltage intensity is required with air-tightness, girth joint of the present invention is received arc position and is equipped with weight with playing welding position
Folded region, in addition at the end of Laser Deep Penetration Welding, directly turns off laser and can there is larger receipts arc crater, impact tank body air-tightness will
Ask, and the present invention, before laser welding gun reaches welding end point, just carries out bonding power decay, make welding receive arc process by deeply melting
Weldering gradually carries out smooth transition to heat transfer weldering, and weld penetration is progressively smaller until to be zero, completes no keyhole and receives arc.
Brief description
Fig. 1 is the structural representation of the embodiment of the present invention 1 rustless steel thick-walled pressure vessel；
Fig. 2 is the structural representation of tank body in Fig. 1；
Fig. 3 is the structural representation of top cover body and low pressure buffer pressure vessel in Fig. 1；
Fig. 4 is the structural representation of the cover plate of Fig. 3 mesolow compensator or trimmer pressure container；
Fig. 5 is the structural representation of pressure inlet in Fig. 1；
Fig. 6 is the bevel for welding form schematic diagram of tank body in Fig. 1；
Fig. 7 is the bevel for welding form schematic diagram of Fig. 1 mesolow compensator or trimmer pressure container.
In accompanying drawing, labelling is described as follows：1st, tank body, 2, top cover body, 3, cover plate, 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, top 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
Extrude QI KOU, base frame rank locked by 2-3-3, cover plate,
Specific embodiment
The present invention passes through to provide a kind of method for laser welding of rustless steel thick-walled pressure vessel, solves superhigh intensity stainless
Weld strength under solid solution or age strengthened temper for the Steel material and problems of welded quality.
In order to solve drawbacks described above, the main thought of the embodiment of the present invention is：
The method for laser welding of embodiment of the present invention rustless steel thick-walled pressure vessel, described pressure vessel includes pressure pan
Body, top cover body, cover plate, conduit and pressure inlet, described top cover body include the top cover that is connected with described high pressure tank body one end fits with
And low pressure buffer container, described low pressure buffer one end is connected with described top cover, and the other end is connected with described cover plate；Institute
The low pressure gas outlet stating tube at one end with described low pressure buffer container is connected, and the other end is connected with described pressure inlet；Described high pressure
Tank body adopts solution strengthening or ageing strengthening stainless steel material with top cover body；
Described high pressure tank body is continuously welded using laser with the circumferential weld at the top cover place of being connected, the continuous welding of described circumferential weld
Parameter includes：
Described tank body wall thickness be 5mm～10mm when, laser power 4.2～7.5KW, speed of welding 0.8～1.5m/min, from
Burnt amount -2mm～3mm, shielding gas flow 15～25L/min.
Embodiment of the present invention pressure vessel uses high intensity, ageing strengthening martensite stainless steel material, generally this
After material welding, for preventing weld seam and heat affected area material from occurring softening will be modulated processing, but this device inside contains
Spring part, sealing surface, can not carry out heat treatment after therefore welding, and must advanced modifier treatment carry out for meeting intensity requirement again
Welding fabrication.High-strength material welding under modulation condition will strictly control weld heat input：For example weld heat input is too high, connects
Head is susceptible to soften, and intensity is unsatisfactory for requiring；Weld heat input is too low, and in weld seam, martensite content is higher, and crackle tendency is relatively
Greatly.Therefore welding parameter coupling is important.And the welding parameter to junction between element each in pressure vessel for the embodiment of the present invention
Carry out rational setting, solved weld strength under solid solution or age strengthened temper for the superhigh strength stainless steel material and ask
Inscribe the grade strong ties it is achieved that mother metal.
In addition, big thickness material laser welding is typically with Laser Deep Penetration Welding pattern and is welded, larger for obtaining
Fusion penetration, because keyhole internal gas pressure is higher during deep penetration welding, spatter can be produced unavoidably 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 carried out, be anti-after welding fabrication
Only the fifth wheel such as spatter enters container intracavity, and the present invention devises lock bottom inner lining structure (and for accurately filling
Join positioning), in welding process, weld penetration is strictly controlled by technological parameter so that weld penetration is just in lock base frame rank
Portion, should ensure to penetrate effective carrying depth, be unlikely to completely penetrate through lock base frame rank again, lead to spatter to enter in container
Chamber.
Also need to consider, laser beam is thinner, and the weld seam of formation is narrower, when throat thickness is larger, may exist because
Laser beam deviate opposite joint center or misaligned with weld seam normal when, lead to back of weld produce incomplete fusion defect generation, therefore
The embodiment of the present invention adjusts a certain degree of weld pool width that increases of technological parameter it is ensured that there being certain process margin.
The molding of embodiment of the present invention pressure vessel generally includes the parts such as tank body, top cover body, cover plate, conduit and pressure inlet
Processing, bevel for welding processing, assembly assembling, circular seams of tank body welding, low pressure buffer container cover plate welding, pipeline welding etc. step
Suddenly, the step that 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 described low pressure is 2-5MPa.
In order to above and other purpose, feature and the advantage of the present invention can be become apparent, number cited below particularly is implemented
Example, to illustrate the method for laser welding of rustless steel thick-walled pressure vessel of the present invention.
Embodiment 1
Embodiment of the present invention thick-walled pressure vessel includes tank body, top cover body, cover plate, conduit and pressure inlet, described top cover body
Including the top cover being connected with described tank body one end fits and low pressure buffer container, described low pressure buffer one end and described top
Lid connects, and the other end is connected with described cover plate；Described tube at one end is connected with the low pressure gas outlet of described low pressure buffer container
Connect, the other end is connected with described pressure inlet；Described tank body adopts solution strengthening or ageing strengthening stainless steel material with top cover body.
The processing of embodiment of the present invention thick-walled pressure vessel, assembling and welding fabrication step, 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, top cover body 2, cover plate 3, conduit 4, connect
Ozzle 5 forms.
1) component processing
Described tank body 1 adopts 0Cr17Ni4Cu4Nb ageing strengthening rustless steel or 20Cr13 solution strengthening stainless steel forgings heat
After process, overall machinery shapes, and its 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；For ensureing welding positioning precision and preventing
Only produce spatter inside container in welding process, increased circumferential weld lock base frame rank 1-2；Joint for ensureing girth joint is strong
Degree, devises compensation joint 1-3.Check valve 1-4 is molectron, is combined by valve element, spring assembly and lock nut.
Described top cover body 2 shapes using with tank body 1 identical material entirety machinery, as shown in figure 3, its agent structure
Form with low pressure buffer container 2-3 two parts including high pressure tank body top cover 2-1, high pressure tank body top cover 2-1 acts not only as high pressure
The top cover of tank body, or the base plate of low pressure buffer container 2-3.High pressure tank body top cover 2-1 machining feature includes and tank body 1 pairing
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
High pressure tank body 1 UNICOM, outside is the hickey of M10 depth 10mm.
As shown in figure 3, described 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 plate lock base frame rank 2-3-3.Low-pressure admission mouth 2-3-2 bottom has φ's 2
Circular hole and low pressure buffer container 2-3 UNICOM, outside is the hickey of M10 depth 10mm；Low pressure gas outlet 2-3-2 bottom has
The circular hole of φ 2 and low pressure buffer container 2-3 UNICOM, outside is the circular hole depth 4mm of φ 3, enters luggage with the conduit 4 for φ 3 for the external diameter
Join welding；Inside low pressure buffer vessel port, with cover plate 3 thickness always, width is depth cover plate lock base frame rank 2-3-3
1mm, step corner wedge angle is processed as R3 fillet, and step needs to carry out back chipping process.
As shown in figure 4, described cover plate 3, it is same material with tank body 1, overall dimensions are assisted with cover plate lock base frame rank 2-3-3
Adjust processing, sharp edge does not allow blunt it is desirable to be not more than 0.1mm with cover plate lock base frame rank 2-3-3 gap clearance.
Described conduit 4, is and tank body 1 material identical φ 3 × 1 standard tubing to intercept it is desirable to two ends according to design length
The smooth impulse- free robustness in face.
As shown in figure 5, described pressure inlet 5, shaped using the bar being same material with tank body 1, cylindrical 5-1 is
M10 screw thread；Circular hole 5-2 aperture is identical with conduit 4 external diameter, deep 5～8mm；Section of stretching out 5-3 thickness 2～3mm, length 3～6mm,
After conduit 4 grafting, welded using angle welding.
2) bevel for welding processing
Described 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 top cover body) outer surface even transition, θ=135 °～150 °.Top cover
Body 2 and tank body 1 apposition position inwall processing a × b breach are it is ensured that top cover body 2 and tank body 1 gap clearance are not more than 0.1mm.
(2) assembly assembling
Described tank body 1 with top cover body 2 installation step is：Circumferential weld lock base frame rank insertion top cover body 2 circle on tank body 1 is opened
In mouthful, involutory surface gap is made to be less than 0.1mm.
Described cover plate 3 with low pressure buffer container 2-3 installation step is：Cover plate 3 is embedded cover plate lock base frame rank 2-3-3,
Cover plate 3 is flushed with low pressure buffer container 2-3 open circumferential, and step difference is not more than 0.1mm.
Described conduit 4 with low pressure buffer container 2-3 installation step is：Low pressure gas outlet 2-3- is inserted in conduit 4 one end
2, insertion depth about 4mm.
Described conduit 4 with pressure inlet 5 installation step is：Conduit 4 other end is inserted in circular hole 5-2 on pressure inlet 5, inserts
Entering depth is 5～8mm.
(3) circular seams of tank body welding
1) tank body positioning welding
Tank body positioning welding technological parameter is：Laser power 2.0～3.5KW, speed of welding 1.5～3.0m/min, out of focus
Amount -1mm～+1mm, shielding gas flow 10～15L/min, tack weld 5～7mm length, spacing 25mm～30mm.Tack welding welds
Seam depth be tank body thickness 1/3～1/2, solder joint width should not wide, therefore speed of welding be difficult too low.
2) circular seams of tank body continuously welds
Circular seams of tank body continuous welding process parameter is：
Described tank body wall thickness be 5mm～10mm when, laser power 4.2～7.5KW, speed of welding 0.8～1.5m/min, from
Burnt amount -2mm～3mm, shielding gas flow 15～25L/min.
(4) low pressure buffer container cover plate welding
1) low pressure buffer container cover plate positioning welding
Positioning welding technological parameter is：Laser power 0.8～1.5KW, speed of welding 1.5～3.0m/min, defocusing amount-
1mm～+1mm, shielding gas flow 10～15L/min, tack weld 3～6mm length, spacing 20mm～25mm.Positioning welding line is deep
Spend 1/3～1/2 for cover sheet thickness, solder joint width is unsuitable wide, therefore speed of welding be difficult too low.
2) low pressure buffer container cover plate continuously welds
Continuous welding process parameter is：
When cover sheet thickness is 2mm～4mm, laser power 1.6～3.5KW, speed of welding 1.0～1.5m/min, out of focus
Amount -1.5mm～2.5mm, shielding gas flow 15～25L/min.
(5) pipeline welding
Conduit 4 is welded using angle welding with low pressure gas outlet 2-3-2 with pressure inlet 5 and conduit 4.Due to conduit
Diameter is little, wall thickness is thin, is advisable using narrow-pulse laser, low weldering speed, to prevent pipe inner wall fusing from blocking.Welding parameter
For：Laser power 0.5～0.8KW, speed of welding 0.3～0.5m/min, defocusing amount -0.5mm～+0.5mm, pulse frequency
80Hz～100Hz, dutycycle 15～30%, 45 ° of incidences of laser beam, shielding gas flow 10～15L/min.
Embodiment 2
Embodiment 2 difference from Example 1 is：
Circular seams of tank body continuous welding process parameter is：
A, when tank body wall thickness be 5mm～6mm when, laser power 4.2～4.8KW, speed of welding 1.2～1.5m/min, from
Burnt amount -1mm～2mm, shielding gas flow 15～25L/min；
B, when tank body wall thickness be 6mm～7mm when, laser power 4.7～5.4KW, speed of welding 1.0～1.3m/min, from
Burnt amount -1.5mm～2.5mm, shielding gas flow 15～25L/min；
C, when tank body wall thickness be 7mm～8mm when, laser power 5.2～6.0KW, speed of welding 0.8～1.2m/min, from
Burnt amount -2mm～3mm, shielding gas flow 15～25L/min；
D, when tank body wall thickness be 8mm～9mm when, laser power 5.8～6.6KW, speed of welding 0.8～1.2m/min, from
Burnt amount -2mm～3mm, shielding gas flow 15～25L/min；
E, when tank body wall thickness be 9mm～10mm when, laser power 6.5～7.5KW, speed of welding 0.8～1.2m/min, from
Burnt amount -2mm～3mm, shielding gas flow 15～25L/min；
Be to ensure that tank body high voltage intensity and air-tightness require, girth joint receive arc position should with rise a welding position be equipped with one section overlapping
Region, overlap length 10～15mm is advisable；At the end of Laser Deep Penetration Welding, directly turn off laser and can there is larger receipts arc crater, shadow
Ring tank body air-tightness to require, before laser welding gun reaches welding end point during 3～10mm, just should carry out bonding power decay,
Make welding receive arc process and smooth transition is gradually carried out to heat transfer weldering from deep penetration welding, weld penetration is progressively smaller until to be zero, completes
No keyhole receives arc.
The technological parameter of the continuous welding of low pressure buffer container and cover plate is：
A, when cover sheet thickness is for 2mm～3mm, laser power 1.6～2.5KW, speed of welding 1.2～1.5m/min, from
Burnt amount -1mm～2mm, shielding gas flow 15～25L/min；
B, when tank body wall thickness be 3mm～4mm when, laser power 2.4～3.5KW, speed of welding 1.0～1.5m/min, from
Burnt amount -1.5mm～2.5mm, shielding gas flow 15～25L/min；
For ensureing tank body high voltage intensity and air-tightness requirement, girth joint overlap length, receipts arc decay and length requirement and tank
Body welding requirements is consistent.
During pipeline welding, weld seam overlap length 1～2mm, allow not carry out receiving arc work(using narrow-pulse laser welding
Rate attenuation process.
The embodiment of the present invention 2 is also provided with postwelding LASER HEAT TREATMENT step：
Tank body 1 adopts solution strengthening or ageing strengthening superhigh strength stainless steel material with top cover body 2, and wall thickness is larger, swashs
Light weld seam rate of cooling is very fast, and weld seam crisp tendency of quenching is larger, crackle easily, postwelding needs to carry out stress relief annealing at once.
But there is check valve assembly tank body 1 bottom it is impossible to carry out post weld heat treatment, therefore using LASER HEATING, weld seam is carried out at heat
Reason, technological parameter is as follows：
Laser power is the 1/5～1/4 of bonding power, speed 0.3～0.4m/min, defocusing amount+20mm～+25mm, light
Spot diameter φ 2mm～φ 3mm, shielding gas flow 15～25L/min.
Technical scheme 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 can make other change and modification to these embodiments.So, claims are intended to be construed to including excellent
Select embodiment and fall into being had altered and changing of the scope of the invention.Obviously, those skilled in the art can be to the present invention
Carry out various change with modification without departing from the spirit and scope of the present invention.So, if these modifications of the present invention and modification
Belong within the scope of the claims in the present invention and its equivalent technologies, then the present invention is also intended to comprise these changes and modification exists
Interior.
Claims (10)
1. a kind of method for laser welding of rustless steel thick-walled pressure vessel it is characterised in that：Described pressure vessel includes pressure pan
Body, low pressure buffer pressure vessel and pipeline, described high pressure tank body adopts solution strengthening or ageing strengthening stainless steel material；Described height
Between pressure tank body and low pressure buffer pressure vessel, the circumferential weld of junction is continuously welded using laser, the continuous welding ginseng of described circumferential weld
Number includes：
When described tank body wall thickness is 5mm～10mm, laser power 4.2～7.5KW, speed of welding 0.8～1.5m/min, out of focus
Amount -2mm～3mm, shielding gas flow 15～25L/min.
2. rustless steel thick-walled pressure vessel according to claim 1 method for laser welding it is characterised in that：Described circumferential weld
Continuous welding parameter include：
A, when high pressure tank wall thick for 5mm～6mm when, laser power 4.2～4.8KW, speed of welding 1.2～1.5m/min, from
Burnt amount -1mm～2mm, shielding gas flow 15～25L/min；
B, when high pressure tank wall thick for 6mm～7mm when, laser power 4.7～5.4KW, speed of welding 1.0～1.3m/min, from
Burnt amount -1.5mm～2.5mm, shielding gas flow 15～25L/min；
C, when high pressure tank wall thick for 7mm～8mm when, laser power 5.2～6.0KW, speed of welding 0.8～1.2m/min, from
Burnt amount -2mm～3mm, shielding gas flow 15～25L/min；
D, when high pressure tank wall thick for 8mm～9mm when, laser power 5.8～6.6KW, speed of welding 0.8～1.2m/min, from
Burnt amount -2mm～3mm, shielding gas flow 15～25L/min；
E, when high pressure tank wall thick for 9mm～10mm when, laser power 6.5～7.5KW, speed of welding 0.8～1.2m/min, from
Burnt amount -2mm～3mm, shielding gas flow 15～25L/min.
3. rustless steel thick-walled pressure vessel according to claim 1 and 2 method for laser welding it is characterised in that：Described
Pressure vessel includes high pressure tank body, top cover body, cover plate, conduit and pressure inlet, and described top cover body includes and described high pressure tank body one
Hold the top cover that is connected and low pressure buffer container, described low pressure buffer one end is connected with described top cover, the other end and
Described cover plate is connected；Described tube at one end is connected with the low pressure gas outlet of described low pressure buffer container, the other end with described
Pressure inlet connects；Described high pressure tank body adopts solution strengthening or ageing strengthening stainless steel material with top cover body；Described high pressure tank body
Continuously welded using laser with the circumferential weld at the top cover place of being connected.
4. rustless steel thick-walled pressure vessel according to claim 3 method for laser welding it is characterised in that：Swash described
Before the continuous girth weld of light, described tank body and the top cover place of being connected carry out laser positioning welding, described laser positioning welding
Parameter be：Laser power 2.0～3.5KW, speed of welding 1.5～3.0m/min, defocusing amount -1mm～+1mm, protection air-flow
Amount 10～15L/min, tack weld 5～7mm length, spacing 25mm～30mm.
5. rustless steel thick-walled pressure vessel according to claim 3 method for laser welding it is characterised in that：Described low pressure
Buffer container is continuously welded using laser with the described cover plate place of being connected, and the continuous welding parameter of described laser includes：
When cover sheet thickness is 2mm～4mm, laser power 1.6～3.5KW, speed of welding 1.0～1.5m/min, defocusing amount-
1.5mm～2.5mm, shielding gas flow 15～25L/min.
6. rustless steel thick-walled pressure vessel according to claim 5 method for laser welding it is characterised in that：Described low pressure
Continuous welding parameter includes buffer container with the laser at the cover plate place of being connected：
A, when cover sheet thickness is for 2mm～3mm, laser power 1.6～2.5KW, speed of welding 1.2～1.5m/min, out of focus
Amount -1mm～2mm, shielding gas flow 15～25L/min；
B, when tank body wall thickness be 3mm～4mm when, laser power 2.4～3.5KW, speed of welding 1.0～1.5m/min, out of focus
Amount -1.5mm～2.5mm, shielding gas flow 15～25L/min.
7. rustless steel thick-walled pressure vessel according to claim 5 method for laser welding it is characterised in that：Described low
Pressure buffer container and the described cover plate place of being connected adopt that laser is continuous weld before, described low pressure buffer container and described cover plate
The place of being connected adopts positioning welding, and the technological parameter of described positioning welding includes：Laser power 0.8～1.5KW, speed of welding
1.5～3.0m/min, defocusing amount -1mm～+1mm, shielding gas flow 10～15L/min, tack weld 3～6mm length, spacing
20mm～25mm；Tack welding weld penetration is the 1/3～1/2 of described cover sheet thickness.
8. rustless steel thick-walled pressure vessel according to claim 3 method for laser welding it is characterised in that：Described conduit
Welded using angle welding and pressure inlet and described conduit and low pressure gas outlet between, the welding parameter bag of described angle welding
Include：Pulsed laser power 0.5～0.8KW, speed of welding 0.3～0.5m/min, defocusing amount -0.5mm～+0.5mm, pulse frequency
Rate 80Hz～100Hz, dutycycle 15～30%, 45 ° of incidences of laser beam, shielding gas flow 10～15L/min.
9. rustless steel thick-walled pressure vessel according to claim 3 method for laser welding it is characterised in that：Described tank body
It is connected with top cover after the girth welding at place, heat treatment is carried out to circumferential weld using LASER HEATING, processing parameter includes：Laser work(
Rate is the 1/5～1/4 of bonding power, speed 0.3～0.4m/min, defocusing amount+20mm～+25mm, spot diameter φ 2mm～φ
3mm, shielding gas flow 15～25L/min.
10. rustless steel thick-walled pressure vessel according to claim 3 method for laser welding it is characterised in that：Described tank
Body and the top cover place of being connected are additionally provided with circumferential weld lock base frame rank and circumferential weld reinforcement step.
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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 |
| CN110340528A (en) * | 2019-07-16 | 2019-10-18 | 湖北三江航天江北机械工程有限公司 | The welding method of airborne pencil 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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| CN106392325B (en) | 2018-07-06 |
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