CN115647532B - Tank welding method for strain-strengthened low-temperature tank - Google Patents
Tank welding method for strain-strengthened low-temperature tank Download PDFInfo
- Publication number
- CN115647532B CN115647532B CN202211575964.XA CN202211575964A CN115647532B CN 115647532 B CN115647532 B CN 115647532B CN 202211575964 A CN202211575964 A CN 202211575964A CN 115647532 B CN115647532 B CN 115647532B
- Authority
- CN
- China
- Prior art keywords
- welding
- tank body
- groove
- protection device
- tank
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/32—Hydrogen storage
Landscapes
- Butt Welding And Welding Of Specific Article (AREA)
- Arc Welding In General (AREA)
Abstract
The invention relates to the technical field of low-temperature tank boxes, in particular to a tank body welding method of a strain-strengthened low-temperature tank box, which comprises the steps of adopting PAW+GTAW automatic welding to weld common circular seams and longitudinal seams and adopting GTAW automatic welding to weld closed circular seams at the outer side of the tank body. The invention adopts PAW+GTAW automatic welding to realize automatic welding of the welding line of the main body of the tank body part of the low-temperature tank under strain reinforcement, greatly reduces the cost and improves the production efficiency, and the one-time welding qualification rate of the welding process reaches more than 98.6 percent.
Description
Technical Field
The invention relates to the technical field of low-temperature tank boxes, in particular to a tank body welding method of a strain-strengthened low-temperature tank box.
Background
The tank body part of the strain-strengthened low-temperature tank is an important component part in the tank and is a core part, and the strain-strengthened low-temperature tank is used for loading inflammable, explosive and toxic hazardous mediums. Because strain strengthening is needed, the quality of the welded joint of the tank body is higher than that of a common welded joint, and the quality and the efficiency of welding of the tank body determine the quality and the production speed of the whole product. The existing circumferential seam and longitudinal seam of the tank body mainly use common welding methods such as submerged arc welding, handle welding, argon arc welding and the like, the tank body of the low-temperature tank is of a large-diameter cylindrical structure, the welding quantity is large, the welding efficiency of the handle welding and the argon arc welding is low, the construction period is long, the requirements on the appearance forming and the primary qualification rate of the welding seam are very high, welding defects such as slag inclusion, air holes and incomplete welding and the like are easy to occur due to manual operation, the submerged arc welding needs back chipping, the inner tank body is generally made of materials such as S30108 and the like under the strain strengthening technology, the carbon arc gouging needs to consider carburization and polishing of the back chipping part, the workload is large, the risk of influencing the quality of the welding seam is caused, and the strain strengthening technology does not allow the manhole to be additionally arranged, so that the sealing of the circumferential seam needs to be formed in a single-sided manner, the back surface cannot be protected by gas (the whole tank body needs to be filled with shielding gas for gas shielding, the back surface) so that the welding cannot be used for the submerged arc welding, the defects exist, the qualified rate of the welding seam is unstable, and the sealing seam is difficult to repair. Besides, the common welding methods all have the defects of needing groove processing and cleaning between welding layers, prolonging the production period, increasing the use of welding consumables and improving the production cost.
The PAW+GTAW automatic welding has the advantages of low line energy, concentrated energy, small welding deformation, single-sided welding and double-sided forming, little filling material, high welding efficiency, good welding joint performance, high one-time qualification rate, attractive forming and the like, the thickness of the tank body of the low-temperature tank under strain reinforcement is within 3-8 mm, groove processing and interlayer cleaning are not needed by using the PAW+GTAW automatic welding, the welding environment is good, no pollution is caused, and unnecessary burden is avoided from later degreasing and cleaning in the tank body, so the process is completely suitable for welding the tank body of the low-temperature tank under strain reinforcement. However, the automatic welding of the PAW and the GTAW lacks reasonable welding preparation and technological parameters, so that the automatic welding of the PAW and the GTAW is limited in the production of the strain-strengthened low-temperature tank, and therefore, the reasonable welding process is positively and advantageously developed for the manufacturing of the low-temperature tank under the strain strengthening.
Disclosure of Invention
Aiming at the technical problems of poor welding quality, low efficiency and the like, the invention provides the tank welding method for the strain-strengthened low-temperature tank, which improves the qualification rate of the tank during welding, improves the production efficiency and further reduces the cost.
The invention provides a tank welding method of a strain-strengthened low-temperature tank, which comprises common girth and longitudinal seam welding and closed girth welding;
the common circular seam and longitudinal seam welding comprises the following steps:
s1, preprocessing welding grooves of cylinder sections of each tank body;
s2, lifting each tank body shell ring to a pairing station for pairing and positioning welding, lifting to a welding station, and modulating the positions of common circular seams and longitudinal seams to the bottommost part;
s3, welding the common circular seam and the longitudinal seam by adopting PAW+GTAW automatic welding in sequence;
the welding machine is positioned in the tank body during common girth welding, a first gas protection device which is tightly attached to the outer surface of the tank body is arranged outside the tank body at the welding machine, the first gas protection device can form a protective gas closed space and is filled with protective gas, and the welding machine and the first gas protection device are fixed during welding and the tank body is welded in a rotating mode;
the welding machine is positioned in the tank body during longitudinal seam welding, a second gas protection device which is tightly attached to the outer surface of the tank body is arranged outside the welding machine, the second gas protection device can form a protective gas closed space and is filled with protective gas, and the welding machine and the second gas protection device are used for welding in a mode of synchronously moving longitudinally and fixing the tank body during welding;
the closed girth welding comprises the following steps:
p1, preprocessing welding grooves at two ends of a shell ring of a tank body;
p2, lifting the tank body end socket to the assembly bench by using lifting equipment to carry out assembly and positioning welding, and welding a backing plate at the inner side of the groove during positioning welding;
and P3, adopting GTAW automatic welding to weld the closed circular seam at the outer side of the tank body.
Further, the method for preprocessing the groove in the step S1 comprises the following steps: the groove is an I-shaped groove, and the groove and the two sides of the groove are corrected and cleaned within the range of 20mm by using a stainless steel polishing tool, so that scrap iron, greasy dirt, moisture, hanging slag and oxide skin on the surface of the groove are removed.
Further, in step S2, the pairing method is as follows: the gap between the two groups is less than or equal to 1mm, the staggered edge amount of the groove is less than or equal to 1/4 of the thickness of the cylinder body, the staggered edge amount is less than or equal to 1mm, and the longitudinal joint is added with an arc striking plate and an arc extinguishing plate which are 50mm multiplied by 50mm and have equal thickness.
Further, in step S2, the method of tack welding is as follows: and argon arc welding is adopted for spot welding, the distance is 500-600 mm, the welding lines are uniformly distributed, and the residual height of the welding lines is less than or equal to 0.5mm.
Further, the first gas protection device and the second gas protection device have the following structures: the box body is provided with an opening at the top, an annular flexible sealing belt is connected at the opening of the box body, the upper end of the annular flexible sealing belt is tightly attached to the outer surface of the tank body, a gas conduit is arranged in the box body and provided with a gas hole, and the gas conduit is connected with an external protective gas supply device through a hose.
Further, in step S3, the automatic welding parameters of the paw+gtaw are: PAW welding, wherein the current polarity is DCEN, the current is 170-190A, the voltage is 24-248V, the welding speed is 26-30 cm/min, and the line energy is less than or equal to 12.3KJ/cm; GTAW welding, wherein the welding material type is ER308L welding wire, the welding material specification is phi 1.0mm, the current polarity is DCEN, the current is 190-210A, the voltage is 12-15V, the welding speed is 26-30 cm/min, and the line energy is less than or equal to 7.2KJ/cm.
Further, in step S3, the structure of the welding machine and the second gas protection device moving longitudinally synchronously is: a sliding rail parallel to the longitudinal seam is arranged right below the longitudinal seam of the tank body, the second gas protection device can slide along the sliding rail, and a welding machine positioned in the tank body is connected with the second gas protection device positioned outside the tank body through a U-shaped rod.
In the step P1, the groove pretreatment method comprises the steps of enabling the groove angle to be 10-15 degrees, enabling the groove gap to be 3-4 mm, adding a backing plate made of the same material at the bottom, enabling the gap between the backing plate and a cylinder body to be 0-0.3 mm, and correcting and cleaning the backing plate, the groove and the two sides within 20 mm.
In the step P2, the method for assembling is that the bevel misalignment amount is less than or equal to 1/4 of the thickness of the cylinder body, and the misalignment amount is less than or equal to 1mm; the positioning welding method is that the backing plate at the inner side of the groove and the cylinder section are welded by argon arc welding, the distance is 500-600 mm, the backing plate and the cylinder section are uniformly distributed, and the residual height of the welding seam is less than or equal to 0.5mm.
Further, the welding method of the GTAW automatic welding comprises the steps of firstly, bottoming at a welding line, and then filling and capping, wherein the arc striking and arc extinguishing positions are overlapped by 10-20mm; the priming welding parameters are ER308L welding wire, welding material specification is phi 1.0mm, current polarity is DCEN, current is 170-190A, voltage is 12-14V, welding speed is 28-32 cm/min, and line energy is less than or equal to 5.7KJ/cm; the filling and capping welding parameters are ER308L welding wire, welding material specification is phi 1.0mm, current polarity is DCEN, current is 190-210A, voltage is 12-15V, welding speed is 26-30 cm/min, and line energy is less than or equal to 7.2KJ/cm.
The invention has the beneficial effects that: the invention adopts PAW+GTAW automatic welding to realize automatic welding of the welding line of the main body of the tank body part of the low-temperature tank under strain reinforcement, greatly reduces the cost and improves the production efficiency, and the one-time welding qualification rate of the welding process reaches more than 98.6 percent.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic view of a general girth welding structure according to an embodiment of the present invention.
FIG. 2 is a schematic view of a longitudinal seam welding structure according to an embodiment of the present invention.
Fig. 3 is a schematic structural view of a first and a second gas protection devices according to an embodiment of the present invention.
Fig. 4 is a schematic view of a gas conduit structure according to an embodiment of the present invention.
In the figure, the device comprises a 1-height adjustable fixed support, a 2-cylinder section, a 3-box body, a 4-welding machine, a 5-sliding rail, a 6-gas conduit, a 7-U-shaped rod, an 8-hose and a 9-annular flexible sealing belt.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
Example 1
The embodiment is 2 strain-strengthening 45ft low-temperature tank body welding, the tank body comprises an inner tank body and an outer tank body, the inner tank body and the outer tank body are made of S30508, the inner diameter of the inner tank body is 2275mm, the length is 13318mm, the wall thickness is 5.5mm, the inner diameter of the outer tank body is 2418mm, the length is 13466mm, and the wall thickness is 4mm. The inner tank body consists of 6 sections of cylinders and 2 sealing heads, wherein 6 common circular seams and longitudinal seams are respectively used for sealing 1 circular seam, and the outer tank body consists of 7 sections of cylinders and 2 sealing heads, wherein 8 common circular seams and 7 longitudinal seams are used for sealing 7 circular seams.
The tank body welding method of the strain-strengthened low-temperature tank comprises common girth and longitudinal seam welding and closed girth welding;
the common circular seam and longitudinal seam welding comprises the following steps:
s1, preprocessing welding grooves of cylinder sections 2 of each tank body, wherein the method for preprocessing the grooves comprises the following steps: the groove is an I-shaped groove, and a stainless steel polishing tool is used for correcting and cleaning the groove and the two sides within a range of 20mm to remove scrap iron, greasy dirt, moisture, hanging slag and oxide skin on the surface of the groove;
s2, lifting each tank shell section 2 to a pairing station for pairing and positioning welding, wherein the pairing method comprises the following steps: the assembly gap is less than or equal to 1mm, the groove misalignment amount is less than or equal to 1/4 of the thickness of the cylinder, the misalignment amount is less than or equal to 1mm, the longitudinal joint is added with an arc striking plate and an arc extinguishing plate which are 50mm multiplied by 50mm and have equal thickness, and the positioning welding method comprises the following steps: spot welding by adopting argon arc welding, wherein the interval is 500-600 mm, the welding seam surplus height is less than or equal to 0.5mm, then lifting to a welding bench, and modulating the positions of common circular seams and longitudinal seams to be welded to the bottommost part;
s3, welding the common circular seam and the longitudinal seam by adopting PAW+GTAW automatic welding in sequence;
as shown in fig. 1, a welding machine 4 is positioned in a tank body during common girth welding, a first gas protection device which is tightly attached to the outer surface of the tank body is arranged outside the tank body at the welding machine, the first gas protection device is arranged on a height-adjustable fixed support 1, as shown in fig. 3 and 4, the first gas protection device comprises a box body 3 with an opening at the top, an annular flexible sealing belt 9 is connected at the opening of the box body 3, the annular flexible sealing belt 9 is made of high-temperature resistant and wear-resistant materials such as temperature resistant rubber and the like, the upper end of the annular flexible sealing belt 9 is tightly attached to the outer surface of the tank body, a gas guide pipe 6 is arranged in the box body 3, the gas guide pipe 6 is provided with air holes, the gas guide pipe 6 is connected with an external protective gas supply device through a hose 8, the first gas protection device can form a protective gas closed space and is filled with protective gas, the protective gas is argon, the welding machine 4 and the first gas protection device is fixed in a mode that the tank body rotates, and the tank body rotates through a roller frame, and the welding point A in fig. 1;
as shown in fig. 2, when welding the longitudinal seam, the welding machine 4 is located in the tank body, a second gas protection device which is tightly attached to the outer surface of the tank body is arranged outside the welding machine 4, the second gas protection device has the same structure as the first gas protection device, the second gas protection device can form a protective gas closed space and is filled with protective gas, the protective gas is argon, and when welding, the welding machine 4 and the second gas protection device are welded in a mode of synchronous longitudinal movement and tank body fixation, and the structure of synchronous longitudinal movement of the welding machine 4 and the second gas protection device is as follows: a sliding rail 5 parallel to the longitudinal seam is arranged right below the longitudinal seam of the tank body, the second gas protection device can slide along the sliding rail 5, a welding machine 4 positioned in the tank body is connected with the second gas protection device positioned outside the tank body through a U-shaped rod 7, and a welding telescopic arm is welded through the U-shaped rod 7 to horizontally move so as to drive the welding machine 4 and the second gas protection device to synchronously longitudinally move, wherein a welding point is positioned at a position B in fig. 2;
in step S3, the parameters of the automatic welding of the paw+gtaw are shown in table 1, and the gas flow rates of the welder 4 with the gas protection device and the first and second gas protection devices are shown in table 2.
TABLE 1 PAW+GTAW automatic welding parameters
Table 2 welder with gas protection device and gas flow rates of the first and second gas protection devices
The closed girth welding comprises the following steps:
p1, welding grooves at two ends of a cylinder section of a tank body, wherein the groove pretreatment method comprises the steps of enabling the groove angle to be 10-15 degrees, enabling no blunt edge to exist, enabling the groove gap to be 3-4 mm, adding a backing plate made of the same material at the bottom, enabling the gap between the backing plate and the cylinder body to be 0-0.3 mm, and correcting and cleaning the backing plate, the groove and the two sides within 20mm;
p2, lifting the tank end socket to a group-matching station by using lifting equipment to perform group-matching and positioning welding, wherein the group-matching method is that the bevel misalignment amount is less than or equal to 1/4 of the thickness of the tank body, and the misalignment amount is less than or equal to 1mm; the positioning welding method is that argon arc welding spot welding is adopted between the backing plate at the inner side of the groove and the cylindrical shell, the spacing is 500-600 mm, the backing plate is uniformly distributed, the residual height of the welding seam is less than or equal to 0.5mm, and the backing plate is welded at the inner side of the groove during positioning welding;
p3, adopting GTAW automatic welding to weld a closed circular seam at the outer side of the tank body, wherein the welding method of the GTAW automatic welding comprises the steps of firstly priming at a welding seam, and then filling and capping, wherein the arc striking and arc extinguishing positions are overlapped by 10-20mm;
in the step P3, welding parameters of GTAW automatic welding are shown in Table 3, and the flow rate of shielding gas argon is 16-20L/min during welding.
TABLE 3 welding parameters for GTAW automated welding
| GTAW automatic welding | Type of welding material | Welding material specification/mm | Polarity of current | current/A | voltage/V | Welding speed/cm/min | Line energy KJ/cm |
| Priming | ER308L | Φ1.0 | DCEN | 170-190 | 12-14 | 28-32 | ≤5.7 |
| Filling and capping | ER308L | Φ1.0 | DCEN | 190-210 | 12-15 | 26-30 | ≤7.2 |
Comparative example
Comparative example the same 2 strain strengthened 45ft cryogenic tank body of example 1 was welded except that the comparative example was welded using a conventional SAW, SMAW, GTAW welding method, respectively.
The PAW+GTAW automatic welding method and the comparative welding method in example 1 are respectively sampled, impact test samples are manufactured according to NB/T47014, impact experiments are carried out according to GB/T229 and NB/T47014, the welding internal conditions and the related toughness capacity of austenitic stainless steel welding joints are detected, and the data of each welding joint are shown in Table 4; and (3) manufacturing a tensile sample according to NB/T47014, and performing a tensile experiment according to GB/T228 to detect the influence of different welding methods on the mechanical properties of the welding joint. The tensile strength data of each welded joint are shown in table 5; bending samples were prepared according to TCATSI 05001-2018, bending experiments were performed according to GB/T2653 and NB/T47014 to test the internal weld conditions and associated plasticity capabilities of austenitic stainless steel weld joints, each weld joint taking 2 out of plane bends and back bends, and the data are shown in table 6.
Table 4 test data for the performance of each weld joint of example 1 and comparative example
Table 5 tensile strength data for each weld joint of example 1 and comparative example
TABLE 6 bending test results for each of the welded joints of example 1 and comparative example
As can be seen from tables 4, 5 and 6, the weld joint performance of the PAW+GTAW automatic weld of the invention is superior to SAW, manual GTAW and SMAW in impact test, tensile test and bending performance.
The invention realizes the automatic welding of all main welding seams of the tank body part of the low-temperature tank under strain reinforcement through the welding process (PAW+GTAW automatic welding), greatly reduces the cost and improves the production efficiency, and the welding process can complete all welding work by only one welder operator, while the SMAW, SAW and manual GTAW at least need 2 welders, thereby having great advantages in personnel quantity; and the welding production efficiency is about 4-5 times of that of manual welding (SMAW, GTAW) and about 1 time of that of SWA; meanwhile, the working time for processing the groove and the carbon arc gouging is saved, welding materials are not used for common annular longitudinal joints basically, and the welding material cost is saved.
After statistics of butt welding stitch data in long-time production practice, the one-time qualification rate of the welding process disclosed by the invention is up to more than 98.6%.
Although the present invention has been described in detail by way of preferred embodiments with reference to the accompanying drawings, the present invention is not limited thereto. Various equivalent modifications and substitutions may be made in the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and it is intended that all such modifications and substitutions be within the scope of the present invention/be within the scope of the present invention as defined by the appended claims.
Claims (6)
1. A tank body welding method of strain-strengthened low-temperature tank is characterized by comprising common circular seam and longitudinal seam welding and closed circular seam welding;
the common circular seam and longitudinal seam welding comprises the following steps:
s1, preprocessing welding grooves of cylinder sections of each tank body;
s2, lifting each tank body shell ring to a pairing station for pairing and positioning welding, lifting to a welding station, and modulating the positions of common circular seams and longitudinal seams to the bottommost part;
s3, welding the common circular seam and the longitudinal seam by adopting PAW+GTAW automatic welding in sequence;
the welding machine is positioned in the tank body during common girth welding, a first gas protection device which is tightly attached to the outer surface of the tank body is arranged outside the tank body at the welding machine, the first gas protection device can form a protective gas closed space and is filled with protective gas, and the welding machine and the first gas protection device are fixed during welding and the tank body is welded in a rotating mode;
the welding machine is positioned in the tank body during longitudinal seam welding, a second gas protection device which is tightly attached to the outer surface of the tank body is arranged outside the welding machine, the second gas protection device can form a protective gas closed space and is filled with protective gas, and the welding machine and the second gas protection device are used for welding in a mode of synchronously moving longitudinally and fixing the tank body during welding;
the closed girth welding comprises the following steps:
p1, preprocessing welding grooves at two ends of a shell ring of a tank body;
p2, lifting the tank body end socket to the assembly bench by using lifting equipment to carry out assembly and positioning welding, and welding a backing plate at the inner side of the groove during positioning welding;
p3, adopting GTAW automatic welding to weld the closed circular seam at the outer side of the tank body;
the first gas protection device and the second gas protection device are provided with the following structures: the device comprises a box body with an opening at the top, wherein an annular flexible sealing belt is connected at the opening of the box body, the upper end of the annular flexible sealing belt is tightly attached to the outer surface of the tank body, a gas conduit is arranged in the box body and provided with a gas hole, and the gas conduit is connected with an external protective gas supply device through a hose;
in step S3, the parameters of automatic welding of the paw+gtaw are: PAW welding, wherein the current polarity is DCEN, the current is 170-190A, the voltage is 24-248V, the welding speed is 26-30 cm/min, and the line energy is less than or equal to 12.3KJ/cm; GTAW welding, wherein the welding material type is ER308L welding wire, the welding material specification is phi 1.0mm, the current polarity is DCEN, the current is 190-210A, the voltage is 12-15V, the welding speed is 26-30 cm/min, and the line energy is less than or equal to 7.2KJ/cm;
in step S3, the structure of the welding machine and the second gas protection device moving longitudinally synchronously is: a sliding rail parallel to the longitudinal seam is arranged right below the longitudinal seam of the tank body, the second gas protection device can slide along the sliding rail, and a welding machine positioned in the tank body is connected with the second gas protection device positioned outside the tank body through a U-shaped rod;
the welding method of the GTAW automatic welding comprises the steps of firstly, bottoming at a welding seam, and then filling and capping, wherein the arc striking and arc extinguishing positions are overlapped by 10-20mm; the priming welding parameters are ER308L welding wire, welding material specification is phi 1.0mm, current polarity is DCEN, current is 170-190A, voltage is 12-14V, welding speed is 28-32 cm/min, and line energy is less than or equal to 5.7KJ/cm; the filling and capping welding parameters are ER308L welding wire, welding material specification is phi 1.0mm, current polarity is DCEN, current is 190-210A, voltage is 12-15V, welding speed is 26-30 cm/min, and line energy is less than or equal to 7.2KJ/cm.
2. The method for welding a tank body of a strain-strengthened low-temperature tank as claimed in claim 1, wherein the groove pretreatment in step S1 comprises the following steps: the groove is an I-shaped groove, and the groove and the two sides of the groove are corrected and cleaned within the range of 20mm by using a stainless steel polishing tool, so that scrap iron, greasy dirt, moisture, hanging slag and oxide skin on the surface of the groove are removed.
3. The method for welding a tank body of a strain-strengthened low-temperature tank as claimed in claim 1, wherein in the step S2, the pairing method is as follows: the gap between the two groups is less than or equal to 1mm, the staggered edge amount of the groove is less than or equal to 1/4 of the thickness of the cylinder body, the staggered edge amount is less than or equal to 1mm, and the longitudinal joint is added with an arc striking plate and an arc extinguishing plate which are 50mm multiplied by 50mm and have equal thickness.
4. The method for welding a tank body of a strain-strengthened low-temperature tank as claimed in claim 1, wherein in the step S2, the method for tack welding is as follows: and argon arc welding is adopted for spot welding, the distance is 500-600 mm, the welding lines are uniformly distributed, and the residual height of the welding lines is less than or equal to 0.5mm.
5. The welding method for the tank body of the strain-strengthened low-temperature tank as claimed in claim 1, wherein in the step P1, the groove pretreatment method is that the groove angle is 10-15 degrees, no blunt edge exists, the groove gap is 3-4 mm, a backing plate made of the same material is added at the bottom, the gap between the backing plate and the cylinder body is 0-0.3 mm, and the backing plate, the groove and the two sides are corrected and cleaned within 20 mm.
6. The welding method for the tank body of the strain-strengthened low-temperature tank as claimed in claim 1, wherein in the step P2, the assembling method is that the groove misalignment amount is less than or equal to 1/4 of the thickness of the tank body, and the misalignment amount is less than or equal to 1mm; the positioning welding method is that the backing plate at the inner side of the groove and the cylinder section are welded by argon arc welding, the distance is 500-600 mm, the backing plate and the cylinder section are uniformly distributed, and the residual height of the welding seam is less than or equal to 0.5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211575964.XA CN115647532B (en) | 2022-12-09 | 2022-12-09 | Tank welding method for strain-strengthened low-temperature tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211575964.XA CN115647532B (en) | 2022-12-09 | 2022-12-09 | Tank welding method for strain-strengthened low-temperature tank |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115647532A CN115647532A (en) | 2023-01-31 |
| CN115647532B true CN115647532B (en) | 2023-05-30 |
Family
ID=85019874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211575964.XA Active CN115647532B (en) | 2022-12-09 | 2022-12-09 | Tank welding method for strain-strengthened low-temperature tank |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115647532B (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108213663A (en) * | 2018-01-17 | 2018-06-29 | 兰州兰石重型装备股份有限公司 | Big thickness cylinder and the complete penetraction and fusion in welding welding method taken over |
| CN109352141A (en) * | 2018-12-18 | 2019-02-19 | 中车长江车辆有限公司 | A kind of welding method of pressure container cylinder circumferential weld |
| CN109909584A (en) * | 2019-04-04 | 2019-06-21 | 天华化工机械及自动化研究设计院有限公司 | A kind of 2205 dual phase steel automatic welding methods |
| CN112139690A (en) * | 2020-09-22 | 2020-12-29 | 重庆欣雨压力容器制造有限责任公司 | Girth welding method adopting P + T and ceramic pad |
-
2022
- 2022-12-09 CN CN202211575964.XA patent/CN115647532B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN115647532A (en) | 2023-01-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU2012203693B2 (en) | Orbital welding apparatus | |
| CN103801796B (en) | The all-position automatic soldering method of pipeline girth weld | |
| CN110732754A (en) | TIG welding device for butt joint of LNG pipelines and welding method thereof | |
| CN102744499B (en) | Double-side double-arc welding process for root layer of pipeline | |
| WO2021114686A1 (en) | Circular seam welding method for low-alloy steel low temperature pressure vessel tank body | |
| CN104646803B (en) | Low alloy steel plate and the welding method of ship plate | |
| CN107999934A (en) | Saddle-shaped joint pipe groove narrow-clearance submerged arc welding connects method and apparatus | |
| CN214134406U (en) | Automatic welding device for cylinder welding seam | |
| CN108856989B (en) | Priming method for fusion electrode MIG welding in pipeline welding | |
| CN213318235U (en) | Stainless steel pipe MIG welding equipment | |
| CN207205642U (en) | A kind of multi-functional Anti-dislocation steel-pipe welding equipment | |
| CN115647532B (en) | Tank welding method for strain-strengthened low-temperature tank | |
| RU2404037C1 (en) | Method and device for welding flat panel necks to manifold pipes | |
| CN202701575U (en) | Double-faced dual-arc welding device of pipe root layer | |
| CN107671398B (en) | SAW automatic welding process method for narrow groove of thick-wall pipe and welding head | |
| US8686316B2 (en) | Automatic welding device of the MIG/MAG type | |
| Mustafa et al. | Automatic welding machine for pipeline using MIG welding process | |
| CN208840759U (en) | Steel-pipe welding auxiliary processing device | |
| CN207723673U (en) | Vertical horizontal position welding built-up welding fixing device | |
| CN105364273A (en) | Solid welding wire gas shield welding method for nickel-based plate type splicing | |
| CN202963759U (en) | Moveable welding gun supporting device | |
| CN210306171U (en) | Submerged arc welding machine gun head for double V-shaped groove | |
| CN210967400U (en) | TIG automatic welding device for butting L NG conveying pipelines | |
| CN103350271A (en) | Welding process for mother tube and branch tube of jacket | |
| CN112171026A (en) | Submerged-arc welding process for low-alloy high-strength steel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |