CN110625230A - Full penetration argon arc welding aerating device for pipe butt joint - Google Patents
Full penetration argon arc welding aerating device for pipe butt joint Download PDFInfo
- Publication number
- CN110625230A CN110625230A CN201911054981.7A CN201911054981A CN110625230A CN 110625230 A CN110625230 A CN 110625230A CN 201911054981 A CN201911054981 A CN 201911054981A CN 110625230 A CN110625230 A CN 110625230A
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- China
- Prior art keywords
- protection
- butt joint
- bulkhead
- arc welding
- argon arc
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Classifications
-
- 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
- B23K9/162—Arc welding or cutting making use of shielding gas making use of a stationary fluid
-
- 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
- B23K9/32—Accessories
- B23K9/325—Devices for supplying or evacuating shielding gas
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/06—Tubes
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention discloses a pipe butt joint full penetration argon arc welding inflation device, which comprises a first protection bulkhead and a second protection bulkhead, wherein the first protection bulkhead is provided with an inert gas inlet, and the second protection bulkhead is provided with a bulkhead gas outlet for gas to flow out; in the using state, the first protection choke plug and the second protection choke plug are plugged into a pipeline to be welded, and a space through which inert gas flows is formed between the first protection choke plug and the second protection choke plug. The gas outlet is arranged on the pipe butt joint full penetration argon arc welding inflation device, so that the problems that the conventional sealing device seals argon gas and pressure formed in a sealing space is easy to be overlarge are solved, welding wires are easy to flow to the back for forming when metal is deposited in a liquid state, and the welding reliability is improved.
Description
Technical Field
The invention relates to the technical field of welding, in particular to a pipe butt joint full penetration argon arc welding inflation device.
Background
An LNG ship is a special ship for transporting Liquefied Natural Gas (LNG) from a liquefaction plant to a receiving station, is one of high-tech and high-value-added ships recognized internationally, and is known as "pearl on crown" of a shipbuilding ship. According to the prediction of an authoritative research department, the total demand of the world LNG ships can reach about 180 in the future 15 years, and the average annual demand is 12; and 20-30 large LNG ships are required to be built in China before 2025 years. Huge market demands at home and abroad are favorable conditions for the construction market of ascending LNG ships in the shipbuilding industry of China.
Because the natural gas can be liquefied at the temperature of-163 ℃, the LNG ship, namely the 'offshore super-refrigeration vehicle' has the task of transporting the liquefied natural gas at the temperature of-163 ℃ and is also a 'explosive warehouse' which moves on the sea, and half-point leakage cannot be avoided. How the liquid cargo maintenance system maintains and resists such ultra-low temperatures during transportation is a major technical difficulty of LNG ships.
The pump tower is one of the most important functional components in the cargo area of LNG ships and one of the three major difficulties in manufacturing LNG ships, which is vertically suspended in each cargo tank. The whole pump tower has the function of loading and unloading the ultra-low temperature and ultra-high pressure liquid natural gas in the cargo hold. The disposable qualification and the inherent quality requirements for the butt welding of pipes are therefore rather high, not allowing any welding defects.
The full penetration argon arc welding is widely applied to pipeline welding. In order to prevent the oxidation reaction of the weld metal at high temperature, the inside of the pipeline must be filled with argon for protection. Because the size of the pump tower butt joint pipeline is small, a person cannot drill into the pump tower for welding, the welding requires single-side welding and double-side forming, the welding seam requirement is high, and the design and use requirements of the welding seam cannot be met by using the traditional pipeline butt joint and welding method.
Disclosure of Invention
The invention aims to provide a pipe butt joint full penetration argon arc welding inflation device which can be used for butt joint of pump tower pipelines of an LNG ship and improves the first-time qualified rate and the quality of welding seams.
In order to achieve the aim, the invention provides a pipe butt joint full penetration argon arc welding inflation device which comprises a first protection bulkhead and a second protection bulkhead, wherein the first protection bulkhead is provided with an inert gas inlet, and the second protection bulkhead is provided with a bulkhead gas outlet for gas to flow out; in the using state, the first protection choke plug and the second protection choke plug are plugged into a pipeline to be welded, and a space through which inert gas flows is formed between the first protection choke plug and the second protection choke plug.
Preferably, said first protective bulkhead and said second protective bulkhead each comprise: sponge, inflatable outer tyre and reinforcing plate; the sponge is circular, the outer side surface of the sponge is wound with an adhesive tape, the inflatable outer tire surrounds the outer ring of the sponge, and the reinforcing plate is fixedly connected to the two side surfaces of the sponge; the outer diameter of the reinforcing plate is smaller than the inner diameter of the inflatable outer tire when the inflatable outer tire is inflated.
Preferably, said inflatable outer tyre is an inflatable rubber tyre.
Preferably, the inflatable outer tyre is provided with an air inflation nozzle and a remote control deflation port.
Preferably, the remote control air release port is a pneumatic electromagnetic valve.
Preferably, the inert gas inlet penetrates through the sponge and the reinforcing plate; the choke plug air outlet penetrates through the sponge and the reinforcing plate.
Preferably, the reinforcing plate is a steel plate.
Preferably, said first protective bulkhead and said second protective bulkhead each further comprise: pulling a rope; the stay ropes are respectively arranged on a reinforcing plate of the first protection bulkhead and a reinforcing plate of the second protection bulkhead, which are deviated from the area to be welded.
Preferably, the inert gas inlet is connected with the gas source device through a quick-release connector.
Preferably, the gas source device is an argon conveying device.
Has the advantages that:
(1) the gas outlet is arranged on the pipe butt joint full penetration argon arc welding inflation device, so that the problems that a conventional sealing device seals argon gas and pressure formed in a sealing space is easy to be overlarge are solved, the welding reliability is improved, and the problems that butt joint pipelines are small in size, cannot be drilled by people for welding, and have the welding requirements of single-side welding, double-side forming and high welding seam requirements, and the design and use and high quality requirements of the welding seam cannot be met by using a traditional pipeline butt joint welding method are effectively solved.
(2) The device has the advantages of simple using method steps, economy and practicability, low cost, good realization effect and good popularization and application value, is manufactured by adopting common tools, and improves the primary qualification rate and the welding seam quality of the pipeline welding seam of the pump tower of the LNG ship.
(3) The invention well solves the technical problems of butt joint, single-side welding and double-side forming of the pipe, and is successfully applied to practice.
Drawings
FIG. 1 is a sectional view showing the use state of the gas-filling device for full penetration argon arc welding in butt joint of pipes according to the present invention.
Fig. 2 is a schematic structural view of the first protective bulkhead.
Figure 3 is a half-sectional view of the first protective bulkhead.
Figure 4 is a cross-sectional view of a first protective bulkhead.
Fig. 5 is a schematic view of the first protective bulkhead in use.
Detailed Description
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
As shown in fig. 1, the pipe butt-joint full penetration argon arc welding inflation device provided by the invention comprises a first protection bulkhead and a second protection bulkhead, wherein the first protection bulkhead is provided with an inert gas inlet 6, and the second protection bulkhead is provided with a bulkhead outlet 13; in a using state, the first protection choke plug and the second protection choke plug are plugged into the pipeline 12 to be welded, and a space through which inert gas flows is formed between the first protection choke plug and the second protection choke plug.
When the full penetration argon arc welding technology is adopted to butt joint the pipelines, usually inert gas sealing devices are placed at two ends of the butt joint area 14 of the pipeline, so that the inert gas is stored in a closed space formed by the inner wall of the pipeline 12 to be welded and the sealing devices at the two ends. And inert argon is introduced into the closed space in the welding process to prevent the metal at the welding seam from generating oxidation reaction at high temperature.
The operation technology of single-side welding and double-side forming is an operation method for welding on the front side and ensuring that a double-side formed welding seam can be obtained on the front side and the back side after welding. During welding, if the argon is sealed by the sealing device, the pressure formed in the sealing space is easy to be overlarge, so that after the front surface is welded, the welding wire is not easy to flow to the back surface for forming when the metal is deposited by the welding wire.
According to the invention, the inert gas inlet 6 is arranged on the first protection choke plug, so that the inert gas can be continuously introduced into a space formed by the inner wall of the pipeline 12 to be welded and the choke plug, and the metal at the welding seam can not be subjected to oxidation reaction at high temperature. The choke plug gas outlet 13 is arranged on the second protective choke plug, so that inert gas can flow out partially, the problem of overlarge pressure in a space formed by the inner wall of the pipeline 12 to be welded and the choke plug is avoided, the welding wire is easy to flow to the back for forming when in molten metal deposition, and the technical problems of butt joint, single-side welding and double-side forming of pipes are well solved.
The first protection choke plug and the second protection choke plug of the inflation device provided by the invention have basically the same structure, and the difference is that the first protection choke plug is provided with an inert gas inlet 6 for introducing inert gas, and the second protection choke plug is provided with a choke plug outlet 13 as a channel for gas flowing out between the inner wall of the pipeline and the two choke plugs. The structure of the first protective bulkhead is described below.
As shown in fig. 2 to 5, the first protective bulkhead comprises: sponge 2, inflatable outer tyre 1 and reinforcing plate 3; the sponge 2 is round, the outer side surface of the sponge is wound with adhesive tapes, the inflatable outer tire 1 surrounds the outer ring of the sponge 2, and the reinforcing plate 3 is fixedly connected to the two side surfaces of the sponge 2. The outer diameter of the reinforcing plate 3 is smaller than the inner diameter of the inflatable casing 1 when inflated.
The bulkhead is typically configured in a circular shape to match the inner wall of the pipe. The diameter of the choke plug is designed according to the diameter of the butt joint pipe, and the choke plug can be used for butt joint of various pipelines by adjusting the diameter of the choke plug. The sponge 2 is selected as the filling material of the choke plug, so that the characteristic of elasticity of the sponge 2 is fully utilized, and the sponge 2 wound with the adhesive tape at the outer part also has sealing performance and can block gas from flowing out. The inner diameter of the inflatable outer tire 1 is precisely attached to the outer ring of the sponge 2 by utilizing the flexibility of the sponge 2, so that the aim of sealing and airtight in the welding process is fulfilled.
In some embodiments, the reinforcing plate 3 is a steel plate. When argon arc welding is filled with argon for protection, the sealed argon between the plugs generates pressure on the plugs at two sides, the sponge 2 cannot reach the strength, and the two sides are required to be respectively adhered with steel plates for reinforcement. Reinforcing plate 3 and sponge 2 pass through the bolt through fixed, and the bolt can satisfy the fixed strength requirement with the nut cooperation. The reinforcing plate 3 can not cover the sponge 2 completely, and a circle of gap allowance is reserved to be used as a telescopic space. When the choke plug is placed at the inner diameter of the pipe, the inflatable outer tire 1 can compress the sponge 2 of the inner ring when being inflated, if the reinforcing plate 3 completely covers the sponge 2 without leaving a gap margin, the reinforcing steel plate can puncture the inflatable outer tire 1 during the compression process, and therefore the gap margin is left, and the occurrence of the situation is avoided.
In some embodiments, the inflatable tire casing 1 is an inflatable rubber tire.
The inflatable outer tyre 1 is provided with an air inflation nozzle 8 and a remote control air release opening.
In some embodiments, the remote-control air release opening is a pneumatic solenoid valve 9.
An inert gas inlet 6 of the first protection bulkhead penetrates through the sponge 2 and the reinforcing plate 3 and can be fixed through bolts and nuts.
The first protective bulkhead further comprises: a pull rope 5; the stay cord 5 is arranged on a reinforcing plate 3 of the first protection choke plug, which deviates from the area to be welded, namely, the stay cord 5 is arranged on the outward reinforcing plate 3, so that the choke plug can be conveniently pulled out from the inside of the pipe after welding. In some embodiments, the reinforcing plate 3 is provided with a pull ring 4, and the pull rope 5 is connected to the pull ring 4.
In some embodiments, the inert gas inlet 6 is connected to the gas source device 11 through the quick release connector 7. And the gas source device 11 selects an argon conveying device for inputting quantitative argon in the argon arc welding process. The inert gas inlet 6 and the quick-release connector 7 are screwed and fixed, and the quick-release connector 7 is convenient for the inert gas inlet 6 to be quickly connected with the gas source device 11.
The structure of the second protection bulkhead can be arranged by referring to the first protection bulkhead. The bulkhead outlet 13 of the second protective bulkhead also extends through the sponge 2 and the reinforcing plate 3.
Example 1
Referring to fig. 5, when the pipes are to be butted, a bulkhead having an outer diameter different from the inner diameter of the pipes by less than or equal to 5mm (i.e. the difference between the outer diameter of the bulkhead and the inner diameter of the pipes is less than or equal to 5mm) is selected, so as to facilitate the placement of the bulkhead in the inner diameter of the pipes and ensure that the difference between the inner diameter and the outer diameter is within the adjustable range of the inflatable outer tire 1. The bulkhead was placed >300 mm from the pipe weld. Because the choke plug is close to the welding line, the choke plug can be pushed into the pipeline by hand before welding. The pulling rope 5 on the choke plug faces outwards.
After the choke plug is placed, the gap between the outer diameter of the choke plug and the inner diameter of the pipe is filled with air by using an air inlet valve arranged on an air filling nozzle 8, so that the outer diameter of the inflatable outer tyre 1 is closely attached to the inner wall of the pipe to be welded, and the aim of filling argon gas to be sealed and not leaking in the welding process is fulfilled.
After the welding is finished, the butt joint of the pipes is completely sealed, the welded pipes are long, and people can not take out the choke plug any more, and then the pneumatic electromagnetic valve 9 which is 12V in specification and 1 inch in size and is arranged outside the non-inflation area of the choke plug can be used for discharging the air of the inflatable outer tyre 1 through remote control. The purpose of this is: (1) the inner wall of the pipe can be protected from being damaged by friction in the process of pulling out the choke plug; (2) the choke plug can be recycled, and the cost is saved. After welding, the choke plug is conveniently pulled out from the pipe through the pull rope 5.
Example 2
And selecting the pipeline with the maximum straightness within the range of-3.5 to +4mm within 30 meters of the total length of the main pipe for welding.
(1) The bulkhead is placed >300 mm from the pipe weld using the drawstring 5.
(2) After the choke plug is placed in place, the inflatable outer tire 1 is inflated to fill the gap between the inner diameter of the pipe and the outer diameter of the choke plug;
(3) assembling and fixing two sections of butt joint pipes by using a tool, ensuring that the pipe wall is staggered in a qualified interval, arranging two blank caps as a group at the positions of more than 300 mm on two sides of a welding line of the pipe respectively, introducing air at one end and discharging air at the other end, wherein the used gas is 99.99% pure argon, and the air outlet is kept in a normally open state to keep the flow velocity of the argon so as to form relatively stable air pressure between the inner wall of the pipe and the blank caps;
(4) the gas flow is more than 25L/min, the welding wire flows to the stroke back for forming when depositing the metal liquid, and the argon is inert gas, so that the welding seam can be protected from being oxidized, and the defects of air holes and the like are avoided;
(5) one turn of the weld needs to be enclosed with a sealing tape 10 (see fig. 1) primarily to prevent air leakage, and the weld is broken off one section of tape until the complete weld is completed.
(6) After welding is finished, because the butt joint pipe is completely closed, the pneumatic electromagnetic valve 9 is opened by remote control to release air in the inflatable rubber tire, the choke plug can be easily pulled out through the pull rope 5, and the pipe with the same diameter can be butted for recycling.
The shooting qualification rate of the butt weld of the steel pipe reaches 99.4 percent. In this embodiment, the risk control objective is completely realized from the beginning to the end of the manufacture of the LNG pump tower. Has been widely accepted and favored by shippers.
The gas charging device can be used for butt joint of pump tower pipelines of an LNG ship.
In conclusion, the invention is proved to be economical and practical by practice, convenient and fast to operate, and well solves the technical problems of pipe butt joint, single-side welding and double-side forming.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (10)
1. A pipe butt joint full penetration argon arc welding inflation device is characterized by comprising a first protection bulkhead and a second protection bulkhead, wherein an inert gas inlet is formed in the first protection bulkhead, and a bulkhead gas outlet for gas to flow out is formed in the second protection bulkhead; in the using state, the first protection choke plug and the second protection choke plug are plugged into a pipeline to be welded, and a space through which inert gas flows is formed between the first protection choke plug and the second protection choke plug.
2. The argon arc welding inflation device for pipe butt joint full penetration according to claim 1, wherein the first protection bulkhead and the second protection bulkhead both comprise: sponge, inflatable outer tyre and reinforcing plate; the sponge is circular, the outer side surface of the sponge is wound with an adhesive tape, the inflatable outer tire surrounds the outer ring of the sponge, and the reinforcing plate is fixedly connected to the two side surfaces of the sponge; the outer diameter of the reinforcing plate is smaller than the inner diameter of the inflatable outer tire when the inflatable outer tire is inflated.
3. The argon arc welding inflation device for full penetration of pipe butt joint according to claim 2, wherein the inflatable outer tire is an inflatable rubber tire.
4. The argon arc welding inflation device for full fusion penetration of pipe butt joint according to claim 2, wherein an inflation air nozzle and a remote control air release opening are arranged on the inflatable outer tire.
5. The argon arc welding gas-filling device for full penetration of pipe butt joint according to claim 4, wherein the remote control gas release port is a pneumatic electromagnetic valve.
6. The argon arc welding inflation device for full penetration of pipe butt joint according to claim 2, wherein the inert gas inlet penetrates through the sponge and the reinforcing plate; the choke plug air outlet penetrates through the sponge and the reinforcing plate.
7. The argon arc welding inflation device for full penetration of pipe butt joint according to claim 2, wherein the reinforcing plate is a steel plate.
8. The argon arc welding inflation device for pipe butt joint full penetration according to claim 2, wherein the first protection bulkhead and the second protection bulkhead both further comprise: pulling a rope; the stay ropes are respectively arranged on a reinforcing plate of the first protection bulkhead and a reinforcing plate of the second protection bulkhead, which are deviated from the area to be welded.
9. The argon arc welding inflation device for full penetration of pipe butt joint according to claim 1, wherein the inert gas inlet is connected with a gas source device through a quick-release joint.
10. The full penetration argon arc welding inflation device for pipe butt joint according to claim 9, wherein the gas source device is an argon conveying device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911054981.7A CN110625230A (en) | 2019-10-31 | 2019-10-31 | Full penetration argon arc welding aerating device for pipe butt joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911054981.7A CN110625230A (en) | 2019-10-31 | 2019-10-31 | Full penetration argon arc welding aerating device for pipe butt joint |
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| Publication Number | Publication Date |
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| CN110625230A true CN110625230A (en) | 2019-12-31 |
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|---|---|---|---|
| CN201911054981.7A Pending CN110625230A (en) | 2019-10-31 | 2019-10-31 | Full penetration argon arc welding aerating device for pipe butt joint |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111331232A (en) * | 2020-03-27 | 2020-06-26 | 陕西丝路机器人智能制造研究院有限公司 | Back inert gas protection device for marine stainless steel pipe section butt welding |
| CN111687238A (en) * | 2020-05-09 | 2020-09-22 | 安徽唐道电子科技有限公司 | Manufacturing method of welded pipe and surface rust prevention treatment method thereof |
| CN113566000A (en) * | 2021-06-30 | 2021-10-29 | 沪东中华造船(集团)有限公司 | LNG ship low temperature pipeline fills inert gas sealing device |
| CN113770496A (en) * | 2021-09-01 | 2021-12-10 | 沪东中华造船(集团)有限公司 | Ship fuel pipe welding inflation device and use method thereof |
-
2019
- 2019-10-31 CN CN201911054981.7A patent/CN110625230A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111331232A (en) * | 2020-03-27 | 2020-06-26 | 陕西丝路机器人智能制造研究院有限公司 | Back inert gas protection device for marine stainless steel pipe section butt welding |
| CN111687238A (en) * | 2020-05-09 | 2020-09-22 | 安徽唐道电子科技有限公司 | Manufacturing method of welded pipe and surface rust prevention treatment method thereof |
| CN113566000A (en) * | 2021-06-30 | 2021-10-29 | 沪东中华造船(集团)有限公司 | LNG ship low temperature pipeline fills inert gas sealing device |
| CN113566000B (en) * | 2021-06-30 | 2023-09-05 | 沪东中华造船(集团)有限公司 | Inert gas filling sealing device for LNG ship low-temperature pipeline |
| CN113770496A (en) * | 2021-09-01 | 2021-12-10 | 沪东中华造船(集团)有限公司 | Ship fuel pipe welding inflation device and use method thereof |
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