CN110039266A - A kind of pressure-resistant welding method of pressure vessel circumferential weld - Google Patents
A kind of pressure-resistant welding method of pressure vessel circumferential weld Download PDFInfo
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- CN110039266A CN110039266A CN201910435878.0A CN201910435878A CN110039266A CN 110039266 A CN110039266 A CN 110039266A CN 201910435878 A CN201910435878 A CN 201910435878A CN 110039266 A CN110039266 A CN 110039266A
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/053—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work aligning cylindrical work; Clamping devices therefor
- B23K37/0531—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work aligning cylindrical work; Clamping devices therefor internal pipe alignment clamps
-
- 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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/053—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work aligning cylindrical work; Clamping devices therefor
- B23K37/0538—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work aligning cylindrical work; Clamping devices therefor for rotating tubes, e.g. rollers
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/18—Submerged-arc welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
- Arc Welding In General (AREA)
Abstract
The invention discloses a kind of pressure-resistant welding methods of pressure vessel circumferential weld, the following steps are included: step 1: by pressure container cylinder assembly on supporting rotary frame, interface is set in pressure container cylinder both sides of the face, with edge milling machines by bevel on the outside of pressure vessel head and pressure container cylinder；Step 2: pressure vessel head is inserted into pressure container cylinder tail end, and applies pressure apparatus in pressure vessel head tail end, positioning welding is carried out to circumferential weld；Step 3: double wire hidden arc welding is set on pressure vessel top, gas shielded arc welding is arranged in bottom in pressure vessel, and swivel mount starts to rotate after preheating, while playing weldering；Step 4: by Nozzle Zone of Vessels and pressure container cylinder erection welding；Step 4: stress relief annealing carries out comprehensive detection to weld seam, will handle inside pressure vessel with outer surface.
Description
Technical field
The invention belongs to industrial manufacturing technology fields, are specifically related to a kind of pressure-resistant welding method of pressure vessel circumferential weld.
Background technique
Girth welding is various round, circular weld welding, and the weld seam of welding fabrication is closed circular ring shape.Circular seam welding
Seam point or less several classes: 1. vertical circumferential welds: weld seam is the all-position welding based on vertical seam, such as；The welding of horizontal tube fixing port is just
It is to belong to vertical circumferential weld.It is also to belong to vertical circumferential weld that certain horizontal pipe, which can be rotated the weld seam of weld bond,.2. horizontal circumferential weld: weld seam is
The all-position welding of transverse joint, such as；The welding of vertical tube weld bond is exactly horizontal circumferential weld.Belong to the welding of horizontal circumferential weld also；It is vertical
The horizontal position welding mouth welding etc. that the horizontal girth welding of the docking of steel storage tank, welder's normal stand or crouching formula carry out girth joint.
In the welding procedure of pressure tight seam, the vertical girth joint of product end socket is most important for pressure vessel
, currently, the method that the prior art in the welding process for circumferential weld, generallys use manual welding, not by relevant auxiliary
Welding equipment is helped, not only production efficiency is low, labor intensity of workers is big, and is difficult to ensure the welding quality of weld seam, occurs many
Welding defect increases Weld Seam Repairation number, and welding efficiency is low, and production is inconvenient.
So aiming at the problems existing in the prior art, the present invention provides a kind of pressure resistance welding of pressure vessel circumferential weld
Method carries out automatic welding to reservoir pressure container using the method for automatic double-sided welding.
Summary of the invention
In view of the above problems, the present invention provides a kind of pressure-resistant welding methods of pressure vessel circumferential weld.
The technical scheme is that a kind of pressure-resistant welding method of pressure vessel circumferential weld, mainly comprises the steps that
Step 1: welding pretreatment
Will be relatively round after the pressure container cylinder cooling after longitudinal seam welding, pressure container cylinder is assembled in supporting rotary frame
On, and four struts for adjusting supporting rotary frame contact the idler wheel of strut front end with pressure container cylinder inner wall, in fixation
Good pressure container cylinder both sides of the face equidistantly set interface, and to pressure container cylinder both ends of the surface and pressure vessel head
Groove is double V-groove, pressure vessel on the outside of connecting end surface edge milling machines bevel, pressure vessel head and pressure container cylinder
Groove is Y type groove on the inside of end socket and pressure container cylinder；
Step 2: connection positioning
By the interface insertion on the connector corresponding pressure shell breech face on pressure vessel head connecting end surface
Formula connection, and apply pressure apparatus in pressure vessel head tail end, for connecting pressure vessel head with pressure container cylinder
Closely, pressure vessel head and pressure container cylinder junction are carried out in criss-cross positioning welding；
Step 3: circumferential weld synchronous welding
The idler wheel of rotational support swivel mount is located at pressure container cylinder with any tack weld of pressure vessel head seam
Double wire hidden arc welding is fixedly installed in pressure container cylinder and pressure vessel head seam apical lateral in the top of pressure container cylinder
Gas shield soldering tip is fixedly installed in head on the inside of pressure container cylinder and pressure vessel head seam bottom end, sets welding parameter
Groove is preheated first afterwards, is then turned on idler wheel and pressure apparatus, rotates idler wheel at the uniform velocity simultaneously with pressure apparatus, and
Double wire hidden arc welding and gas shielded arc welding play weldering simultaneously when idler wheel starts rotation, in pressure container cylinder and pressure vessel head seam
Inner side and outer side synchronizes welding, is soldered to pressure container cylinder and rotates a circle, and double wire hidden arc welding and gas shielded arc welding are simultaneously
Stop welding, stands cooling；
Step 4: adapter tube welding
It is assembled using the method that step 1 to step 3 provides by Nozzle Zone of Vessels is same as pressure container cylinder
Welding；
Step 5: after welding treatment
After the completion of welding, stress relief annealing operation is carried out to commissure, comprehensive detection, detection then are carried out to weld seam
It will be handled inside pressure vessel with outer surface after qualification.
Further, the supporting rotary frame includes telescopic rod, fixing head, strut and idler wheel, and the fixing head is fixed to be connected
It connecing in the distal end of telescopic rod, the proximal end of telescopic rod is connected with telescope motor, for sending fixing head to girth welding, the support
There are four bar is total to, it is fixed at fixing head side in cross, the idler wheel is separately fixed at the remote of strut there are four being total to
End, idler wheel two sides are equipped with rotating electric machine, and supporting rotary frame is to be supported to fix simultaneously to pressure container cylinder inside by strut
Pressure vessel rotation is driven by the synchronous rotation of idler wheel, inside support stationary phase can be to avoid ambient pressure for external fixation
Pressure container cylinder is deformed, workpiece is caused to scrap.
Further, the groove is cleaned and is dried using cleaning agent before welding, avoids groove and groove vicinity
Iron rust, greasy dirt, water, paint or other sundries welding is impacted.
Further, the rotation speed of the pressure apparatus and the rotation speed of swivel mount are completely the same.
Further, welding parameter includes according to weld seam and the weld seam of groove parameter setting preheating temperature in the step 2
Degree, the rotation speed of swivel mount and pressure apparatus, double wire hidden arc welding and gas shielded arc welding operating power.
Further, the comprehensive detection in the step 4 includes the gas pressure test and air-tight test successively carried out,
Pressure vessel internal pressure keeps stablizing during gas pressure test and pressure vessel integrally has no obvious deformation bulge Fang Weihe after pressure release
Lattice during air-tight test, carry out air-leakage test, no gas leak phenomenon Fang Weihe to all weld seams of pressure vessel and junction
Lattice, the pressure vessel for meeting above-mentioned test can just come into operation.
Further, in the step 4 by the mode handled with outer surface inside pressure vessel include polishing and
Spray painting, polishing grind off weld part outstanding, and spray painting can be to avoid Surface Pressure Vessel oxidation and rusting.
The beneficial effects of the present invention are: a kind of pressure-resistant welding method of pressure vessel circumferential weld provided by the invention, compared to
For the prior art, pressure container cylinder is fixed using internal support fixed mode, pressure can be made to avoid ambient pressure
Shell deformation, causes workpiece to scrap, while being rotated synchronously by the idler wheel of supporting rotary frame and driving pressure vessel rotation, can
Spot welding is fixed inside pressure vessel when pressure vessel rotation to realize, and by pressure vessel head and pressure vessel
Retaining wall on slope is double V-groove on the outside of cylinder, and retaining wall on slope is Y type groove on the inside of pressure vessel head and pressure container cylinder, is used
Double wire hidden arc welding welds on the outside of pressure vessel, is welded in welding on the inside of pressure vessel, pressure container cylinder rotation with gas shield
When, double wire hidden arc welding and gas shielded arc welding are welded from the vertex of pressure vessel and bottom end respectively, avoid weldering synchronous in same position
Jointing temp is excessively high to cause burn-through pressure vessel.In short, the present invention has many advantages, such as that method is perfect, safe and efficient, easy to use.
Detailed description of the invention
Fig. 1 is supporting rotary frame structural schematic diagram of the invention.
Wherein, 1- supporting rotary frame, 11- telescopic rod, 111- telescope motor, 12- fixing head, 13- strut, 14- idler wheel,
141- rotating electric machine.
Specific embodiment
For convenient for the understanding to technical solution of the present invention, with reference to the accompanying drawing 1 and specific embodiment the present invention is done into one
The explanation of step, embodiment do not constitute the restriction to invention protection scope.
Embodiment 1: a kind of pressure-resistant welding method of pressure vessel circumferential weld mainly comprises the steps that
Step 1: welding pretreatment
Will be relatively round after the pressure container cylinder cooling after longitudinal seam welding, pressure container cylinder is assembled in supporting rotary frame 1
On, and four struts 13 for adjusting supporting rotary frame 1 contact the idler wheel 14 of 13 front end of strut with pressure container cylinder inner wall,
Interface is equidistantly set in the pressure container cylinder both sides of the face fixed, and pressure container cylinder both ends of the surface and pressure are held
Groove is double V-groove on the outside of device end socket connecting end surface edge milling machines bevel, pressure vessel head and pressure container cylinder, pressure
Groove is Y type groove on the inside of force container end socket and pressure container cylinder, and groove is cleaned and dried using cleaning agent before welding
It is dry；
Step 2: connection positioning
By the interface insertion on the connector corresponding pressure shell breech face on pressure vessel head connecting end surface
Formula connection, and apply pressure apparatus in pressure vessel head tail end, for connecting pressure vessel head with pressure container cylinder
Closely, pressure vessel head and pressure container cylinder junction are carried out in criss-cross positioning welding；
Step 3: circumferential weld synchronous welding
The idler wheel 14 of rotational support swivel mount 1 makes pressure container cylinder and any tack weld of pressure vessel head seam
Positioned at the top of pressure container cylinder, buried in pressure container cylinder and pressure vessel head seam apical lateral fixed setting mariages
Gas shield soldering tip, setting welding is fixedly installed in arc-welding head on the inside of pressure container cylinder and pressure vessel head seam bottom end
Groove is preheated first after parameter, welding parameter includes according to the weld seam preheating temperature of weld seam and groove parameter setting, rotation
The operating power of the rotation speed of pivoted frame and pressure apparatus, double wire hidden arc welding and gas shielded arc welding is then turned on idler wheel 14 and pressure
Power device rotates idler wheel 14 at the uniform velocity simultaneously with pressure apparatus, and the rotation speed of pressure apparatus and the rotation speed of idler wheel 14 are complete
Entirely unanimously, double wire hidden arc welding and gas shielded arc welding play weldering simultaneously when and idler wheel 14 starts rotation, in pressure container cylinder and press
Force container end socket seam inner side and outer side synchronizes welding, is soldered to pressure container cylinder and rotates a circle, double wire hidden arc welding with
Gas shielded arc welding stops welding simultaneously, stands cooling；
Step 4: adapter tube welding
It is assembled using the method that step 1 to step 3 provides by Nozzle Zone of Vessels is same as pressure container cylinder
Welding；
Step 5: after welding treatment
After the completion of welding, stress relief annealing operation is carried out to commissure, comprehensive detection, Quan Fang then are carried out to weld seam
Position detection includes the gas pressure test and air-tight test successively carried out, and pressure vessel internal pressure keeps stablizing during gas pressure test
And pressure vessel integrally has no obvious deformation bulge side for qualification, during air-tight test, to all weld seams of pressure vessel after pressure release
With junction progress air-leakage test, no gas leak phenomenon side is qualification, by pressure vessel inside and outer surface after detection is qualified
It is handled, the mode of processing includes polishing and spray painting.
Embodiment 2: a kind of pressure-resistant welding method of pressure vessel circumferential weld mainly comprises the steps that
Step 1: welding pretreatment
Will be relatively round after the pressure container cylinder cooling after longitudinal seam welding, pressure container cylinder is assembled in supporting rotary frame 1
On, and four struts 13 for adjusting supporting rotary frame 1 contact the idler wheel 14 of 13 front end of strut with pressure container cylinder inner wall,
Interface is equidistantly set in the pressure container cylinder both sides of the face fixed, and pressure container cylinder both ends of the surface and pressure are held
Groove is double V-groove, V on the outside of device end socket connecting end surface edge milling machines bevel, pressure vessel head and pressure container cylinder
Type groove bevel angle is 68 °, and groove is Y type groove, Y type bevel angle on the inside of pressure vessel head and pressure container cylinder
It is 59 °, groove is cleaned and dried using cleaning agent before welding；
Step 2: connection positioning
By the interface insertion on the connector corresponding pressure shell breech face on pressure vessel head connecting end surface
Formula connection, and apply pressure apparatus in pressure vessel head tail end, for connecting pressure vessel head with pressure container cylinder
Closely, pressure vessel head and pressure container cylinder junction are carried out in criss-cross positioning welding；
Step 3: circumferential weld synchronous welding
The idler wheel 14 of rotational support swivel mount 1 makes pressure container cylinder and any tack weld of pressure vessel head seam
Positioned at the top of pressure container cylinder, buried in pressure container cylinder and pressure vessel head seam apical lateral fixed setting mariages
Gas shield soldering tip, setting welding is fixedly installed in arc-welding head on the inside of pressure container cylinder and pressure vessel head seam bottom end
170 DEG C of preheatings are carried out to groove first after parameter, the rotation speed that swivel mount and pressure apparatus is arranged is turning for 1/300r per second
Speed, the operating power of double wire hidden arc welding are 65KW, and the operating power of gas shielded arc welding is 13KW, it is then turned on idler wheel 14 and pressure
Power device rotates idler wheel 14 at the uniform velocity simultaneously with pressure apparatus, and the rotation speed of pressure apparatus and the rotation speed of idler wheel 14 are complete
Entirely unanimously, double wire hidden arc welding and gas shielded arc welding play weldering simultaneously when and idler wheel 14 starts rotation, in pressure container cylinder and press
Force container end socket seam inner side and outer side synchronizes welding, is soldered to pressure container cylinder and rotates a circle, double wire hidden arc welding with
Gas shielded arc welding stops welding simultaneously, stands weld seam and is cooled to 40 DEG C or less；
Step 4: adapter tube welding
It is assembled using the method that step 1 to step 3 provides by Nozzle Zone of Vessels is same as pressure container cylinder
Welding；
Step 5: after welding treatment
After the completion of welding, stress relief annealing operation is carried out to commissure, comprehensive detection, Quan Fang then are carried out to weld seam
Position detection includes the gas pressure test and air-tight test successively carried out, and pressure vessel internal pressure keeps stablizing during gas pressure test
And pressure vessel integrally has no obvious deformation bulge side for qualification, during air-tight test, to all weld seams of pressure vessel after pressure release
With junction progress air-leakage test, no gas leak phenomenon side is qualification, by pressure vessel inside and outer surface after detection is qualified
It is handled, the mode of processing includes polishing and spray painting.
As shown in Figure 1, supporting rotary frame 1 includes telescopic rod 11, fixing head 12, strut 13 and idler wheel 14, fixing head 12 is solid
Surely be connected to the distal end of telescopic rod 11, the proximal end of telescopic rod 11 is connected with telescope motor 111, strut 13 altogether there are four, be in cross
Shape is fixed at 12 side of fixing head, and idler wheel 14 is separately fixed at the distal end of strut 13,14 two sides of idler wheel are equipped with there are four being total to
Rotating electric machine 141
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used
To modify to technical solution documented by previous embodiment or equivalent replacement of some of the technical features；And
These are modified or replaceed, the spirit and model of technical solution of the embodiment of the present invention that it does not separate the essence of the corresponding technical solution
It encloses.
Claims (8)
1. a kind of pressure-resistant welding method of pressure vessel circumferential weld, which is characterized in that mainly comprise the steps that
Step 1: welding pretreatment
Will be relatively round after the pressure container cylinder cooling after longitudinal seam welding, by pressure container cylinder assembly on supporting rotary frame (1),
And four struts (13) for adjusting supporting rotary frame (1) make the idler wheel (14) of strut (13) front end with pressure container cylinder inner wall
Contact equidistantly sets interface in the pressure container cylinder both sides of the face fixed, and to pressure container cylinder both ends of the surface and
Groove is V-type on the outside of pressure vessel head connecting end surface edge milling machines bevel, pressure vessel head and pressure container cylinder
Groove is Y type groove on the inside of groove, pressure vessel head and pressure container cylinder；
Step 2: connection positioning
Interface plug-in type on connector corresponding pressure shell breech face on pressure vessel head connecting end surface is connected
It connects, and applies pressure apparatus in pressure vessel head tail end, for being completely embedded pressure vessel head with pressure container cylinder,
Pressure vessel head and pressure container cylinder junction are carried out in criss-cross positioning welding；
Step 3: circumferential weld synchronous welding
The idler wheel (14) of rotational support swivel mount (1), makes pressure container cylinder and any tack weld of pressure vessel head seam
Positioned at the top of pressure container cylinder, buried in pressure container cylinder and pressure vessel head seam apical lateral fixed setting mariages
Gas shield soldering tip, setting welding is fixedly installed in arc-welding head on the inside of pressure container cylinder and pressure vessel head seam bottom end
Groove is preheated first after parameter, is then turned on idler wheel (14) and pressure apparatus, makes idler wheel (14) and pressure apparatus simultaneously
At the uniform velocity rotate, and idler wheel (14) start rotation when double wire hidden arc welding and gas shielded arc welding play weldering simultaneously, in pressure container cylinder
Welding is synchronized with pressure vessel head seam inner side and outer side, pressure container cylinder is soldered to and rotates a circle, mariages submerged arc
Weldering stops to weld simultaneously with gas shielded arc welding, stands cooling；
Step 4: adapter tube welding
Erection welding is carried out by Nozzle Zone of Vessels is same as pressure container cylinder using the method that step 1 to step 3 provides；
Step 5: after welding treatment
After the completion of welding, stress relief annealing operation is carried out to commissure, comprehensive detection then is carried out to weld seam, detection is qualified
It will be handled inside pressure vessel with outer surface afterwards.
2. a kind of pressure-resistant welding method of pressure vessel circumferential weld according to claim 1, which is characterized in that the support rotation
Pivoted frame (1) includes telescopic rod (11), fixing head (12), strut (13) and idler wheel (14), and the fixing head (12) is fixedly connected on
The distal end of telescopic rod (11), the proximal end of telescopic rod (11) are connected with telescope motor (111), and the strut (13) is in there are four being total to
Cross is fixed at fixing head (12) side, and the idler wheel (14) is separately fixed at the distal end of strut (13) there are four being total to,
Idler wheel (14) two sides are equipped with rotating electric machine (141).
3. a kind of pressure-resistant welding method of pressure vessel circumferential weld according to claim 1, which is characterized in that the groove exists
It cleans and dries using cleaning agent before welding.
4. a kind of pressure-resistant welding method of pressure vessel circumferential weld according to claim 1, which is characterized in that the pressure dress
The rotation speed set and the rotation speed of idler wheel (14) are completely the same.
5. a kind of pressure-resistant welding method of pressure vessel circumferential weld according to claim 1, which is characterized in that the step 2
Middle welding parameter includes the rotation speed according to the weld seam preheating temperature of weld seam and groove parameter setting, swivel mount and pressure apparatus
The operating power of degree, double wire hidden arc welding and gas shielded arc welding.
6. a kind of pressure-resistant welding method of pressure vessel circumferential weld according to claim 1, which is characterized in that the step 4
In comprehensive detection include the gas pressure test and air-tight test successively carried out, pressure vessel internal pressure during gas pressure test
It keeps stablizing and pressure vessel integrally has no obvious deformation bulge side for qualification, during air-tight test, to pressure vessel after pressure release
All weld seams and junction carry out air-leakage test, and no gas leak phenomenon side is qualification.
7. a kind of pressure-resistant welding method of pressure vessel circumferential weld according to claim 1, which is characterized in that the step 4
It is middle that the mode handled inside pressure vessel with outer surface is included into polishing and spray painting.
8. a kind of pressure-resistant welding method of pressure vessel circumferential weld according to claim 1, which is characterized in that the idler wheel
(14) rotation speed of rotation speed and pressure apparatus is completely the same.
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| CN201910435878.0A CN110039266B (en) | 2019-05-23 | 2019-05-23 | Pressure-resistant welding method for circular seam of pressure vessel |
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| CN201910435878.0A CN110039266B (en) | 2019-05-23 | 2019-05-23 | Pressure-resistant welding method for circular seam of pressure vessel |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110560956A (en) * | 2019-08-19 | 2019-12-13 | 国家电网有限公司 | Circular seam welding device |
| CN112605613A (en) * | 2020-12-14 | 2021-04-06 | 沈阳航天新光压力容器有限公司 | Manufacturing process of compressed air storage tank |
| CN114473393A (en) * | 2021-10-18 | 2022-05-13 | 悍高集团股份有限公司 | Water tank manufacturing method |
| CN114619198A (en) * | 2021-12-21 | 2022-06-14 | 平高集团有限公司 | Cylinder circumferential weld welding auxiliary device |
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