CN112475551A - Girth welding method for thin-wall tank body of low-alloy steel low-temperature pressure container - Google Patents
Girth welding method for thin-wall tank body of low-alloy steel low-temperature pressure container Download PDFInfo
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- CN112475551A CN112475551A CN202011193386.4A CN202011193386A CN112475551A CN 112475551 A CN112475551 A CN 112475551A CN 202011193386 A CN202011193386 A CN 202011193386A CN 112475551 A CN112475551 A CN 112475551A
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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
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
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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
- B23K9/00—Arc welding or cutting
- B23K9/02—Seam welding; Backing means; Inserts
- B23K9/028—Seam welding; Backing means; Inserts for curved planar seams
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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
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/173—Arc welding or cutting making use of shielding gas and of a consumable electrode
Abstract
The invention belongs to the technical field of girth welding, and particularly relates to a girth welding method for a thin-wall tank body of a low-alloy steel low-temperature pressure container. The welding method comprises the following steps: debugging the welding equipment until the welding equipment meets the requirements; sticking a liner on the back of the circular seam of the tank body; welding between circular seams of the tank body and the cylinder body to be welded by adopting penetration type tungsten argon arc welding to form bottoming weld beads between the circular seams of the tank body and the cylinder body, and molding the back; and adopting cover-surface gas metal arc welding to form filling and cover-surface welding between the circular seams of the tank body and the cylinder body to be welded. The invention has the characteristics of high production efficiency, processing cost reduction, labor cost saving, labor intensity reduction of welders and clean welding site.
Description
Technical Field
The invention belongs to the technical field of girth welding, and particularly relates to a girth welding method for a thin-wall tank body of a low-alloy steel low-temperature pressure container.
Background
At present, the circumferential seam of a thin-wall tank body of a low-alloy steel low-temperature pressure container is an important B-type welding seam, the welding joint coefficient is 1.0, full penetration is required, radiographic inspection or recordable ultrasonic inspection is carried out after welding, the radiographic inspection is qualified when the radiographic inspection reaches more than II grade, the ultrasonic inspection is qualified when the ultrasonic inspection reaches more than one grade, the surface of the welding seam has no defects of cracks, pores, incomplete fusion, incomplete penetration, undercut and the like, and the residual height of the welding seam is not more than 1.5 mm.
In the prior art, the girth welding of the thin-wall tank body of the low-alloy steel low-temperature pressure vessel mostly adopts double-sided submerged arc welding, namely, the front side is welded firstly, after the front side is welded, the back side of a welding seam is back-gouged, polished and welded, the submerged arc welding uses a welding flux for protection, the welding flux needs to be dried before welding, and when the front side is welded, the welding flux needs to be padded on the back side by a welding flux pad trolley to prevent welding penetration.
In carrying out the present invention, the applicant has found that at least the following disadvantages exist in the prior art:
1) the submerged arc welding needs double-side welding, the front side is welded for one circle, the back side is welded for one circle, the girth welding time of the tank body is long, and the work efficiency is low.
2) Before welding the back side, the back is required to be gouged, carbon arc air gouging is generally used for gouging, after gouging, a carbide and a carburized layer are required to be removed by polishing, the noise is large, the dust is more, the manual labor intensity is high, and the work efficiency is low.
3) The submerged arc welding uses welding flux which needs to be dried, the back welding also needs to use a welding flux pad trolley, a special person needs to be matched with the trolley to add the welding flux, the number of workers is large, the welding flux is easy to spill, and the working environment is poor.
4) The submerged arc welding has large heat input, large crystal grains of a weld joint structure, limited performance of a welding joint, low toughness and low impact energy at the low temperature of minus 40 ℃, and the impact absorption power value of an impact test is difficult to be qualified when a 3-6mm thin plate is welded.
5) The consumption of submerged arc welding wires and welding flux is large, and the welding cost is high.
The girth welding method for the thin-wall tank body of the low-alloy steel low-temperature pressure container in the prior art has the advantages of complex process, low production efficiency, high welding cost, easy penetration of thin plate welding and poor joint toughness, and is difficult to meet the requirement of the pressure container standard on the impact absorption power.
Therefore, improvements in the prior art are needed.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a girth welding method for a thin-wall tank body of a low-alloy steel low-temperature pressure vessel, which aims to solve the technical problems that the process is complex, the production efficiency is low, the welding cost is high, a thin plate is easy to weld through, the toughness of a joint is poor, and the requirement of the pressure vessel standard on the impact absorption power is difficult to meet due to the adoption of double-sided submerged arc welding in the prior art.
The invention realizes the purpose through the following technical scheme:
a girth welding method for a thin-wall tank body of a low-alloy steel low-temperature pressure vessel comprises the following steps:
debugging the welding equipment until the welding equipment meets the requirements;
sticking a liner on the back of the circular seam of the tank body;
welding between circular seams of the tank body and the cylinder body to be welded by adopting penetration type tungsten argon arc welding to form bottoming weld beads between the circular seams of the tank body and the cylinder body, and molding the back;
and adopting cover-surface gas metal arc welding to form filling and cover-surface welding between the circular seams of the tank body and the cylinder body to be welded.
Further, paste the liner at the back of jar body barrel circumferential weld, specifically include:
the gasket is in a ring shape formed by splicing a plurality of monomers, the interiors of the monomers of the gasket are bonded on the high-temperature adhesive tapes, and the high-temperature adhesive tapes are positioned at the two axial ends of the tank body cylinder body and are bonded on the back surfaces of the two tank body cylinder bodies 1 to be welded through the aluminum foil adhesive tapes respectively.
Furthermore, the length of each single body of the gasket is 15-20mm, the axial two ends of each single body of the gasket are processed with grooves with the angle of (5-10), the gasket is provided with an avoiding groove at the position of the circular seam of the cylinder body, the section of the avoiding groove is arc-shaped, and the radius of the arc-shaped is 8-12 mm.
Preferably, the liner is copper.
Further, adopt penetrating type tungsten electrode argon arc to weld between treating the welded jar body barrel circumferential weld, make and form the bottoming welding bead between the jar body barrel circumferential weld, and the back shaping specifically includes:
the transparent argon tungsten-arc is free electric arc, the transparent argon tungsten-arc melting pool is protected by nozzle welding protective gas, the welding protective gas is 99.99% pure argon, the flow rate is 12-15 l/min, the welding current is 260-300A, and the electric arc voltage is 14-28V.
Further, adopt the gas shielded welding of capping consumable electrode to form between the jar body barrel circumferential weld of waiting to weld and fill and the capping weld, specifically include:
the molten pool of the cover surface gas metal arc welding is protected by adopting nozzle welding shielding gas, the welding shielding gas adopts 80% argon gas and 20% carbon dioxide argon-rich mixed gas, the flow is 20-25 l/min, the welding current is 240-300A, and the arc voltage is 24-30V.
Further, debugging the welding equipment until it meets the requirements specifically includes:
the cylinder body of the tank body to be welded is placed on the roller carrier, and the deep-melting argon arc welding gun and the gas metal arc welding gun are both positioned right above the outer side of the circular seam of the cylinder body.
Furthermore, during the backing weld bead welding, adjust dark melting argon arc welds welder, makes dark melting argon arc welds welder and is located vertical state to aim at the generating line position on the jar body directly over the circumferential weld, and make the extension line of welder axis pass through the centre of circle point of circumferential weld.
Further, when the backing weld bead is welded, the linear speed of rotation of the cylinder body of the tank body is (200-280) mm/min;
during filling and cover surface welding, the rotating linear speed of the tank body barrel is (300-800) mm/min, automatic welding is adopted for cover surface welding, a welding gun transversely swings during welding, and the swing amplitude is (5-8) mm, so that the two sides of a cover surface welding bead and a cover surface bottoming welding bead are (1-2) mm respectively.
Furthermore, auxiliary filler wires are needed during backing weld pass welding and filling and cover surface welding, the filler wires are low alloy steel solid welding wires, the diameter of the filler wires is 1.2mm, and the type of the filler wires is ER 50-6.
The girth welding method for the thin-wall tank body of the low-alloy steel low-temperature pressure container provided by the invention has the beneficial effects that at least:
1. the back forming is forced under the auxiliary action of the back liner by utilizing the good penetrating capability and bridging capability of the deep-melting argon arc welding penetration type electric arc, so that the back forming of single-side welding is realized, double-side welding is not needed, back chipping is also not needed, and the production efficiency is high.
2. In addition, the requirements of the good penetrating capability and bridging capability of the deep-melting argon arc welding penetration type electric arc on the circular seam assembly gap do not need to be very high in precision, so that the requirement of the edge straightness of a tank plate is reduced, and the processing cost is reduced.
3. Only gas protection and a gasket are needed in the welding process, compared with submerged arc welding, the welding flux and drying are saved, the labor cost is saved, the labor intensity of a welder is reduced, and the welding site is clean.
4. The cover surface adopts gas metal arc welding, so that the deposition efficiency is high, the welding speed is high, and the forming is easy to control.
5. The welding quality is good, the back liner is formed forcibly, meanwhile, the thickness of a welding seam of the bottoming layer is accurately controlled, the welding seam residual height can be ensured to meet the requirement of the low-temperature pressure container standard on the residual height, the residual height can reach more than 1.0mm, the thickness of a circumferential weld is effectively increased, the effective thickness of a compact tungsten electrode argon arc welding seam is increased, the compactness of the circumferential weld is ensured from the surface, and the helium leakage detection qualification rate of the circumferential weld reaches 100%. For a circumferential weld with higher requirement on the toughness of a weld joint, particularly when a thin-wall weld of a low-temperature low-alloy steel 16MnDR and Q345R pressure container has the requirement on low-temperature impact power at the temperature of-40 ℃, the aims of refining grains, improving metallographic structures and improving the strength and toughness of the joint can be fulfilled by filling welding wires and tempering weld beads.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic flow chart of a girth welding method for a thin-walled tank body of a low-alloy steel low-temperature pressure vessel in the embodiment;
FIG. 2 is a schematic diagram of a girth welding state of a thin-wall tank body of the low-alloy steel low-temperature pressure vessel;
FIG. 3 is a front view of the liner of FIG. 2;
fig. 4 is a side view of fig. 3.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic flow chart of a girth welding method for a thin-walled tank of a low-alloy steel low-temperature pressure vessel in the embodiment, fig. 2 is a schematic view of a girth welding state of a thin-walled tank of a low-alloy steel low-temperature pressure vessel, and with reference to fig. 1 and fig. 2, the welding method includes:
s1: debugging the welding equipment until the welding equipment meets the requirements:
in the embodiment of the invention, the debugging of the welding equipment comprises the assembly of the tank body and the barrel body 1, the posture setting of a welding gun and the selection of welding wires.
Specifically, will wait to weld jar body barrel 1 and place on the gyro wheel frame, its aim at: during subsequent welding, the roller carrier can be opened, and the rotation of the roller carrier is utilized to drive the rotation of the tank body barrel 1, so that the welding gun can keep a posture, and the welding of one circumference of the tank body barrel 1 can be completed.
The posture of the welding gun is set as follows: the deep-melting argon arc welding gun and the gas metal arc welding gun are both positioned right above the outer side of the circular seam of the cylinder body, the deep-melting argon arc welding gun is positioned in a vertical state and is aligned to the position of a bus on the tank body right above the circular seam, and the extension line of the axis of the welding gun passes through the center point of the circular seam.
In the embodiment, auxiliary filler wires are required in the deep argon arc welding and the gas metal arc welding, the filler wires in the embodiment are low alloy steel solid core welding wires with the diameter of 1.2mm and the type ER50-6, and the impact energy of the welding wires at the low temperature of-40 ℃ is more than 47J. The welding wire has good processing performance, the tensile strength Rm of a welding joint is higher than that of a base metal, the 180-degree bending performance is qualified, and the impact absorption power KV2 reaches above 29J.
S2, adhering a gasket on the back of the circular seam of the can body and the cylinder 1:
the gasket of the present embodiment is in a ring shape formed by splicing a plurality of single bodies, fig. 3 is a front view of the single body of the gasket in fig. 2, fig. 4 is a schematic side view of fig. 3, and with reference to fig. 2 to 4, in the present embodiment, the inside of the single body 2 of the gasket is bonded to a high temperature adhesive tape 3, and the high temperature adhesive tape 3 is located at two axial ends of a tank body cylinder 1 and is bonded to the back surfaces of two tank body cylinders 1 to be welded through an aluminum foil adhesive tape 4.
In the embodiment, the length of the single body 2 of each gasket is 15-20mm, grooves with the angle of (5-10) degrees are processed at two axial ends of the single body 2 of each gasket, so that when the single bodies 2 are connected into a circumferential arc shape, the single bodies 2 are in gapless connection with the contact surface of a tank body, an avoiding groove 2.1 is arranged at the position, right opposite to the circumferential seam of the tank body, of each single body 2 of each gasket, the section of each avoiding groove 2.1 is in an arc shape, the radius of each arc shape is 8-12, the avoiding groove 2.1 is arranged and used for cooling molten weld metal, so that the weld metal is prevented from flowing and falling, the back of each weld is forced to form, and meanwhile, a larger flexible space is provided for the.
Preferably, the gasket 2 of the present embodiment may be copper.
The liner of the embodiment can be repeatedly used, and the aluminum foil adhesive tape is replaced to be adhered to the inner wall of the tank body.
S3: adopt penetration type tungsten electrode argon arc to weld between treating the welded jar body barrel circumferential weld, make and form bottoming welding bead 5 between the jar body barrel circumferential weld, and the back shaping, specifically:
the transparent argon tungsten-arc welding method is characterized in that a transparent argon tungsten-arc welding pool is protected by nozzle welding shielding gas, the welding shielding gas is 99.99% pure argon, the flow rate is 12-15 l/min, the welding current is 260-300A, and the arc voltage is 14-28V;
in addition, when backing weld bead welding is carried out, the linear speed of rotation of the tank body cylinder is 200-280 mm/min.
S4: adopt the gas shielded welding of capping consumable electrode to form between the jar body barrel circumferential weld of waiting to weld and fill and capping and weld 6, specifically include:
a molten pool of the cover surface gas metal arc welding is protected by adopting nozzle welding shielding gas, the welding shielding gas adopts 80% argon gas and 20% carbon dioxide argon-rich mixed gas, the flow rate is 20-25 l/min, the welding current is 240-300A, and the arc voltage is 24-30V;
during filling and cover surface welding, the rotating linear speed of the tank body barrel is 300-800 mm/min, automatic welding is adopted for cover surface welding, a welding gun transversely swings during welding, and the swing amplitude is 5-8 mm, so that the two sides of a bottoming weld bead of the cover surface weld bead are respectively 1-2 mm.
The cover gas metal arc welding of the embodiment is used for filling and cover welding, the width and the surplus height of a welding line are adjusted, meanwhile, the tempering effect is realized on the welding line of the front pass, partial remelting or heat influence is carried out on columnar crystals in the welding line of the bottoming welding pass, and the performance of a joint is improved.
It should be noted that, the joint type of the barrel circumferential weld butt joint of this embodiment all adopts i type groove, need not to prepare the groove, need not to adopt planing, milling machine processing, in addition, the backing weld of this embodiment all adopts single-deck single pass to weld with the capping.
The above description will be further made by taking the example of the 16MnDR thin-walled can body manufacturing girth welding, but the present invention is not limited to this vehicle type, and for example, a vehicle type such as Q345R low alloy.
1. Hoisting the assembly parts of the cylinder sections of the tank body to be welded with the circular seams to a roller frame;
2. moving a welding gun to the position above the circular seam of the tank body, adjusting the tungsten electrode argon arc welding gun to be vertical, aligning the position of a bus on the tank body right above the circular seam, and enabling an extension line of the axis of the welding gun to pass through a circle center O point of the circular seam;
3. setting technological parameters of argon tungsten-arc welding and pasting a gasket;
4. adjusting the wire feeding speed of a wire feeder to be aligned to the center of an arc area and 2mm below the end part of a tungsten electrode;
5. opening the roller carrier, and rotating the roller carrier;
6. starting an argon arc welding gun for welding, and protecting a weld joint on the front side of the equal argon arc welding seam by using welding shielding gas;
7. stopping backing welding after the backing weld bead reaches one circle;
8. and after the bottoming weld bead reaches one circle, switching to the gas metal arc welding gun head, starting the cover surface tempering weld bead gas metal arc welding, and welding the complete strip circular seam.
9. And the welding of other circular seams of the tank body is completed by the same method.
Table 1 shows a comparison table of the effect of the weld impact test, and it can be known from table 1 that the girth welding method for the thin-walled tank of the low-alloy steel low-temperature pressure vessel shown in this embodiment has higher central impact energy of the weld compared with the conventional welding method.
| Base material | Weld impact test temperature | Weld center impact energy KV2 | |
| Conventional welding method | 16MnDR | -40℃ | 10J～24J |
| The welding method | 16MnDR | -40℃ | ＞29J |
TABLE 1
The welding method of the embodiment is used for welding the circular seam of the cylinder body, the production tact is 12-20 meters per hour, and the welding can be carried out under the conditions that the ambient temperature is 0-40 ℃, the relative humidity is less than or equal to 90 percent, and the continuous working is carried out for 22 hours under the rated load.
The beneficial effect of this embodiment does:
1. the back forming is forced under the auxiliary action of the back liner by utilizing the good penetrating capability and bridging capability of the deep-melting argon arc welding penetration type electric arc, so that the back forming of single-side welding is realized, double-side welding is not needed, back chipping is also not needed, and the production efficiency is high.
2. In addition, the requirements of the good penetrating capability and bridging capability of the deep-melting argon arc welding penetration type electric arc on the circular seam assembly gap do not need to be very high in precision, so that the requirement of the edge straightness of a tank plate is reduced, and the processing cost is reduced.
3. Only gas protection and a gasket are needed in the welding process, compared with submerged arc welding, the welding flux and drying are saved, the labor cost is saved, the labor intensity of a welder is reduced, and the welding site is clean.
4. The cover surface adopts gas metal arc welding, so that the deposition efficiency is high, the welding speed is high, and the forming is easy to control.
5. The welding quality is good, the back liner is formed forcibly, meanwhile, the thickness of a welding seam of the bottoming layer is accurately controlled, the welding seam residual height can be ensured to meet the requirement of the low-temperature pressure container standard on the residual height, the residual height can reach more than 1.0mm, the thickness of a circumferential weld is effectively increased, the effective thickness of a compact tungsten electrode argon arc welding seam is increased, the compactness of the circumferential weld is ensured from the surface, and the helium leakage detection qualification rate of the circumferential weld reaches 100%. For a circumferential weld with higher requirement on the toughness of a weld joint, particularly when a thin-wall weld of a low-temperature low-alloy steel 16MnDR and Q345R pressure container has the requirement on low-temperature impact power at the temperature of-40 ℃, the aims of refining grains, improving metallographic structures and improving the strength and toughness of the joint can be fulfilled by filling welding wires and tempering weld beads.
The following embodiments are provided for the purpose of illustrating the present invention and are not to be construed as limiting the present invention in any way, and it will be apparent to those skilled in the art that the technical features of the present invention can be modified or changed in some ways without departing from the scope of the present invention.
Claims (10)
1. A girth welding method for a thin-wall tank body of a low-alloy steel low-temperature pressure vessel is characterized by comprising the following steps:
debugging the welding equipment until the welding equipment meets the requirements;
sticking a liner on the back of the circular seam of the tank body;
welding between circular seams of the tank body and the cylinder body to be welded by adopting penetration type tungsten argon arc welding to form bottoming weld beads between the circular seams of the tank body and the cylinder body, and molding the back;
and adopting cover-surface gas metal arc welding to form filling and cover-surface welding between the circular seams of the tank body and the cylinder body to be welded.
2. The method for girth welding of the thin-walled tank body of the low-alloy steel low-temperature pressure vessel according to claim 1, wherein the step of adhering a liner to the back of the girth of the tank body cylinder specifically comprises the following steps:
the gasket is in a ring shape formed by splicing a plurality of monomers, the interiors of the monomers of the gasket are bonded on the high-temperature adhesive tapes, and the high-temperature adhesive tapes are positioned at the two axial ends of the tank body cylinder body and are bonded on the back surfaces of the two tank body cylinder bodies 1 to be welded through the aluminum foil adhesive tapes respectively.
3. The girth welding method for the thin-wall tank body of the low-alloy steel low-temperature pressure vessel is characterized in that the length of each single body of the liner is 15-20mm, grooves with the angle of (5-10) ° are machined at the two axial ends of each single body of the liner, an avoiding groove is formed in the position, facing the cylinder body girth, of each single body of the liner, the section of each avoiding groove is arc-shaped, and the radius of each arc-shaped groove is 8-12 mm.
4. The method of girth welding a thin-walled can body of a low alloy steel cryogenic pressure vessel according to claim 1 wherein the liner is copper.
5. The method for welding the circular seams of the thin-wall tank body of the low-alloy steel low-temperature pressure vessel according to claim 1, wherein the circular seams of the tank body and the tank body to be welded are welded by adopting a transmission type argon tungsten-arc welding method, so that a bottoming weld bead is formed between the circular seams of the tank body and the tank body, and the back surface is formed, and the method specifically comprises the following steps:
the transparent argon tungsten-arc is free electric arc, the transparent argon tungsten-arc melting pool is protected by nozzle welding protective gas, the welding protective gas is 99.99% pure argon, the flow rate is 12-15 l/min, the welding current is 260-300A, and the electric arc voltage is 14-28V.
6. The method for welding the girth joint of the thin-wall tank body of the low-alloy steel low-temperature pressure vessel according to claim 1, wherein the filling and cover welding is formed between the girth joints of the tank body and the tank body to be welded by adopting cover gas metal arc welding, and the method specifically comprises the following steps:
the molten pool of the cover surface gas metal arc welding is protected by adopting nozzle welding shielding gas, the welding shielding gas adopts 80% argon gas and 20% carbon dioxide argon-rich mixed gas, the flow is 20-25 l/min, the welding current is 240-300A, and the arc voltage is 24-30V.
7. The girth welding method for the thin-wall tank body of the low-alloy steel low-temperature pressure vessel is characterized in that the welding equipment is debugged until the welding equipment meets the requirements, and the method specifically comprises the following steps:
the cylinder body of the tank body to be welded is placed on the roller carrier, and the deep-melting argon arc welding gun and the gas metal arc welding gun are both positioned right above the outer side of the circular seam of the cylinder body.
8. The method for girth welding of the thin-walled tank body of the low-alloy steel low-temperature pressure vessel according to claim 7, wherein during the backing weld pass welding, the deep-melting argon arc welding gun is adjusted to be in a vertical state, and is aligned with a generating line position on the tank body right above the girth, and an extension line of an axis of the welding gun passes through a central point of the girth.
9. The girth welding method for the thin-wall tank body of the low-alloy steel low-temperature pressure vessel is characterized in that the linear speed of rotation of the tank body cylinder during backing weld bead welding is (200-280) mm/min;
during filling and cover surface welding, the rotating linear speed of the tank body barrel is (300-800) mm/min, automatic welding is adopted for cover surface welding, a welding gun transversely swings during welding, and the swing amplitude is (5-8) mm, so that the two sides of a cover surface welding bead and a cover surface bottoming welding bead are (1-2) mm respectively.
10. The method of claim 1, wherein an auxiliary filler wire is required for the backing weld and the filling and facing weld, and the filler wire is a low alloy steel solid wire with a diameter of 1.2mm and a filler wire type of ER 50-6.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114226925A (en) * | 2021-12-20 | 2022-03-25 | 广州市洲航船舶设备有限公司 | Stainless steel workpiece butt deep-melting argon arc welding method |
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| CN114226925A (en) * | 2021-12-20 | 2022-03-25 | 广州市洲航船舶设备有限公司 | Stainless steel workpiece butt deep-melting argon arc welding method |
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Application publication date: 20210312 |