KR20170030683A - Method and apparatus for purging welding pipe - Google Patents

Method and apparatus for purging welding pipe Download PDF

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Publication number
KR20170030683A
KR20170030683A KR1020150127531A KR20150127531A KR20170030683A KR 20170030683 A KR20170030683 A KR 20170030683A KR 1020150127531 A KR1020150127531 A KR 1020150127531A KR 20150127531 A KR20150127531 A KR 20150127531A KR 20170030683 A KR20170030683 A KR 20170030683A
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KR
South Korea
Prior art keywords
gas
purging
liquid
pipe
welding
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KR1020150127531A
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Korean (ko)
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KR101767988B1 (en
Inventor
정성욱
배광무
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대우조선해양 주식회사
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Priority to KR1020150127531A priority Critical patent/KR101767988B1/en
Publication of KR20170030683A publication Critical patent/KR20170030683A/en
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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
    • B23K9/32—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
    • B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
    • 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
    • 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
    • B23K9/24—Features related to electrodes
    • B23K9/28—Supporting devices for electrodes
    • B23K9/29—Supporting devices adapted for making use of shielding means
    • B23K9/291—Supporting devices adapted for making use of shielding means the shielding means being a 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
    • B23K9/00—Arc welding or cutting
    • B23K9/32—Accessories
    • B23K9/325—Devices for supplying or evacuating shielding gas
    • B23K9/326—Purge gas rings, i.e. devices for supplying or evacuating shielding gas inside of hollow or tubular articles, e.g. pipes, vessels
    • B23K2201/06—

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
  • Arc Welding In General (AREA)

Abstract

Disclosed is a method and apparatus for purging a pipe weld capable of performing local gap purging using water-soluble purging paper and performing high quality finishing welding. The purging method of the pipe welding includes a step of blocking the inside of the pipe with a water-soluble film at a position spaced from the welded part by a predetermined distance; Positioning a gas and liquid inlet within the piping; Injecting a purging gas into the piping through the gas and liquid injection ports; Welding joints of pipes other than the gas and liquid injection ports; Injecting a purging liquid through the gas and liquid injection ports; Withdrawing the gas and liquid injection ports from the piping; And finishing the remaining portion of the pipe.

Description

[0001] METHOD AND APPARATUS FOR PURGING WELDING PIPE [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a purging method and apparatus for piping welding, and more particularly, to a purging method and apparatus for piping welding for performing efficient purging using gas and liquid during on-site welding of a non-ferrous metal pipe.

Generally, when pipe welding is performed on stainless steel, titanium or other corrosion-resistant material, a protective gas is sprayed to prevent oxidation during welding. The injected protective gas prevents oxidation from occurring on the surface of the welded part of the melting furnace or the high temperature.

Methods for preventing oxidation during welding include a shielding method in which an inert gas is sprayed from a welding torch to prevent oxidation near the melting point and a method in which an inert gas is filled in a joint pipe to oxidize beads And a purging method for preventing the overheating. Prevention of oxidation among piping welding quality is very important. In case of high quality titanium welding at heavy industry such as FPSO manufacturing, maximum oxygen concentration allowed in purging is limited to 20ppm.

A pumped internal pipe apparatus has been disclosed in Korean Patent Publication No. 10-1019053 (Feb. 24, 2011).

1, in the conventional purging method, water-soluble purging paper 4 is preliminarily installed inside pipes 1 and 2 for welding a non-ferrous metal pipe, and the purging gas is supplied through a purging gas inlet 3. The purging gas escapes through the outlet (5).

As described above, the method of injecting the purging gas into the weld gap is disadvantageous in that the finish welding quality is drastically lowered due to the purging gas outflow because the purging gas inlet 3 must be removed at the time of finishing welding. In addition, piping materials sensitive to the purging gas concentration such as Duplex, Super duplex, CuNi, and Ti pipes may be re-welded depending on the quality of the finished weld.

For this reason, the welding operation is performed by a purging method in which the sponge-free joint is closed with water-soluble fusing paper only at one end of the pipe to be joined and the inside space of the opposite pipe is purged.

However, such a purging method has a problem in that the space to be purged becomes inefficient, the gas consumption required for purging is high, and the time required for reaching the oxygen concentration sufficient for welding is long, which lowers the workability.

Korean Registered Patent No. 10-1019053 (Feb. 24, 2011)

In order to solve such conventional problems, the present invention provides a purging method and an apparatus for piping welding which can perform local gap purging using water-soluble purging paper and can perform high quality finishing welding.

According to the present invention, there is provided a purging method of pipe welding, comprising: a step of blocking a portion of the pipe which is spaced apart from the welded portion by a water-containing film; Positioning a gas and liquid inlet within the piping; Injecting a purging gas into the piping through the gas and liquid injection ports; Welding joints of pipes other than the gas and liquid injection ports; Injecting a purging liquid through the gas and liquid injection ports; Withdrawing the gas and liquid injection ports from the piping; And finishing the remaining portion of the pipe.

Meanwhile, the purging apparatus for piping welding according to the present invention includes a purging gas and a gas and liquid injection port for selectively supplying the purging gas and the purging liquid to the inside of the pipe.

The purging method and apparatus for pipe welding according to the present invention can realize local purging in which only the joint point is purged without performing purging at the stage of loading the shipbuilding macroblock. In addition, since only a small amount of space is purged, the amount of gas used and the time required for purging can be drastically reduced. In addition, the purging method is very easy, so it can be carried out even if it is not a skilled worker and gas safety accident can be prevented.

1 is a view for explaining a conventional purging method,
2 is a flowchart illustrating a purging method of pipe welding according to an embodiment of the present invention,
FIGS. 3 to 11 are cross-sectional views of piping showing a purging method of piping welding according to an embodiment of the present invention,
FIG. 12 is a schematic view showing a purging apparatus for pipe welding according to an embodiment of the present invention,
FIG. 13 illustrates purging through a purging apparatus for piping welding according to an embodiment of the present invention.

Hereinafter, the technical configuration of the purging method and apparatus of the pipe welding will be described in detail as follows.

FIG. 2 is a flow chart showing a purging method of pipe welding according to an embodiment of the present invention, and FIGS. 3 to 11 are sectional views of pipes sequentially showing a purging method of pipe welding according to an embodiment of the present invention Fig. 12 is a schematic view showing a purging apparatus for piping welding according to an embodiment of the present invention, and Fig. 13 is a view for explaining purging through piping welding purging apparatus according to an embodiment of the present invention. It is.

2 to 13, a method for purging a pipe weld according to an embodiment of the present invention includes the steps of closing the pipe 101 at a position spaced apart from the welded portion by a water-containing film 150; Positioning a gas and liquid inlet (200) inside the pipe (101); Injecting a purge gas into the pipe 101 through the gas and liquid injection port 200; Welding the joints of the remaining piping except for the gas and liquid inlet (200); Injecting a purging liquid through the gas and liquid injection ports 200; Removing the gas and liquid inlet (200) from the pipe (101); And finishing the remaining portion of the pipe.

A method for purging a pipe weld according to an embodiment of the present invention is a method for performing gap purging using a water-soluble membrane for purging a pipe weld of a non-iron material. In the finishing step of the gap purging, Finishing welding is carried out after injecting liquid.

First, as shown in FIG. 13, a work is performed to prevent the outflow of the purging gas at a distance of about 250 mm from the welded portion before the piping is attached, with the water-containing film 150. Subsequently, as shown in FIG. 3, the gas and liquid injection ports 200 are positioned inside the pipe 101. The gas and liquid injection port 200 selectively supplies the purge gas as well as the purge liquid to the inside of the pipe.

Then, the gas for purging is injected into the inside of the pipe 101 through the gas and liquid injection port 200. At the same time, joints of pipes other than the gas and liquid injection ports 200 are welded.

Reference numeral 103 in FIG. 3 indicates that a super-layered welding process is proceeding with about 10% of a welded layer having undergone super-layer welding. Fig. 4 shows a state in which welding is continued in the state of Fig. 3 to complete approximately 50% of layered welding. FIG. 5 shows a state in which the welding is continued in the state of FIG. 4 to complete the multi-layer welding.

After the multi-layer welding is completed, multi-layer welding is performed by welding the next welding layer 105 on the multi-layer welding layer 103 as shown in FIG. This process is repeated to form the multi-layer welding layers 103, 105, 107, and 109 as shown in FIG.

In this case, the finishing welds are formed at a distance shorter than the previous welded layer in the multi-layer welding. Preferably, the next finishing weld layer 107 is spaced 30 to 50 mm away from the previous weld layer 105 as shown in Fig.

Thereafter, as shown in Fig. 8, a liquid for purging is injected through the gas and liquid injection ports 200. [ The purge liquid may be composed of liquid argon or liquid nitrogen or the like.

Referring to FIG. 9, the purging liquid injected into the piping 101 is vaporized in the state of being contained in the piping 101, and a purging atmosphere is formed during finishing welding. Thereafter, as shown in Fig. 10, after the gas and liquid injection ports 200 are taken out of the pipe 101, the remaining part of the pipe is finely welded. Reference numeral 111 in Fig. 10 is a finishing weld. Thereafter, finish welding is completely performed as shown in Fig.

Referring to FIG. 13, the method further includes fixing the water-containing film 150 to the pipe 101 through the water-soluble tape 400. By fixing the water-soluble tape 400 to the lower portion of the water-containing film 150, the strength can be compensated.

The purging apparatus 300 for purging welding according to an embodiment of the present invention performs purging at the time of welding of a pipe and includes a gas and liquid inlet 200, a receiving tank 305, a liquid supply pipe 303, A gas supply pipe 301, and a cylinder 307. [

The gas and liquid injection ports 200 are drawn into or drawn out of the piping 101 and selectively supply the purging gas and the purging liquid to the inside of the piping 101. The accommodating tank 305 has a space portion for accommodating the purging liquid 201 therein.

The liquid supply pipe 303 connects the accommodation tank 305 and the gas and liquid injection port 200 so that the liquid for purging can be transferred from the accommodation tank 305 to the inside of the pipe through the gas and liquid injection port 200 It becomes a passage.

The gas supply pipe 301 connects the storage tank 305 and the gas and liquid injection port 200 so that the purging gas can be transferred from the storage tank 305 to the inside of the pipe through the gas and liquid injection port 200 It becomes a passage.

The cylinder 307 serves as a power source for transferring the purging liquid 201 contained in the accommodation tank 305 to the gas and liquid injection port 200 side. The cylinder 307 is slidable in the accommodation tank 305 so that the liquid for purging 201 or the purging gas accommodated in the accommodation tank 305 at the time of lifting and lowering the cylinder 307 is pushed toward the gas and liquid injection port 200 side .

With this configuration, it is possible to implement local purging in which only the joint point is purged without performing purging at the stage of loading the shipbuilding giant block. In addition, since only a small amount of space is purged, the amount of gas used and the time required for purging can be drastically reduced. In addition, since the purging method is very easy, it can be carried out even if it is not a skilled worker, and the gas safety accident can be prevented.

Although the method and apparatus for pumping pipe welding according to the present invention have been described with reference to the embodiments shown in the drawings, the present invention is merely illustrative and various modifications and equivalent embodiments can be made by those skilled in the art I will understand. Accordingly, the scope of the true technical protection should be determined by the technical idea of the appended claims.

101: piping 150: water-containing film
200: gas and liquid inlet 301: gas supply pipe
303: liquid supply pipe 305: receiving tank
307: cylinder 400: water-soluble tape

Claims (7)

(150) at a position spaced a predetermined distance from the welded portion in the pipe (101);
Positioning a gas and liquid inlet (200) inside the pipe (101);
Injecting a purge gas into the pipe 101 through the gas and liquid injection port 200;
Welding the joints of the remaining piping except for the gas and liquid inlet (200);
Injecting a purging liquid through the gas and liquid injection ports 200;
Removing the gas and liquid inlet (200) from the pipe (101); And
And finishing the remaining portion of the pipe. The method according to claim 1,
Wherein the finishing welds in the multi-layer welding are formed to be shorter than the previous welds by a certain distance. The method according to claim 1,
Wherein the purging liquid is composed of liquid argon or liquid nitrogen. The method according to claim 1,
Wherein the injected purifying liquid is vaporized while being accommodated in the pipe 101 to form a purging atmosphere at the time of finishing welding. The method according to claim 1,
Further comprising the step of fixing the water-soluble film (150) to the pipe (101) through the water-soluble tape (400). A purging apparatus for piping welding that performs purging at the time of welding of piping,
And a gas and liquid inlet (200) for selectively supplying the purge gas and the purge liquid to the inside of the pipe (101). The method according to claim 6,
A receiving tank 305 for receiving the purge liquid 201;
A liquid supply pipe (303) connecting the accommodation tank (305) and the gas and liquid injection port (200);
A gas supply pipe 301 connecting the storage tank 305 and the gas and liquid injection port 200; And
And a cylinder (307) for transferring the purging liquid (201) contained in the containing tank (305) to the gas and liquid injection port (200) side.
KR1020150127531A 2015-09-09 2015-09-09 Method for purging welding pipe KR101767988B1 (en)

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KR101767988B1 KR101767988B1 (en) 2017-08-16

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107953011A (en) * 2017-11-22 2018-04-24 宝鸡石油机械有限责任公司 A kind of subsea production tree petroleum pipeline assembly welding method
CN111168203A (en) * 2020-01-16 2020-05-19 海洋石油工程股份有限公司 Semi-automatic argon arc welding process for corrosion-resistant alloy composite pipe
CN111230270A (en) * 2020-01-13 2020-06-05 海洋石油工程股份有限公司 Pipe test piece 2G circumferential weld argon arc welds inside shielding gas device
KR20210040548A (en) 2019-10-04 2021-04-14 대우조선해양 주식회사 Backing device for pipe welding and pipe welding method using the same

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20210007550A (en) 2019-07-12 2021-01-20 대우조선해양 주식회사 Backing device for pipe girth seam welding
KR20210144379A (en) 2020-05-22 2021-11-30 대우조선해양 주식회사 Pipe seam welding method using glass fiber backing material

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101019053B1 (en) 2008-07-24 2011-03-07 삼성중공업 주식회사 Purging Apparatus For Pipe Welding

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101019053B1 (en) 2008-07-24 2011-03-07 삼성중공업 주식회사 Purging Apparatus For Pipe Welding

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107953011A (en) * 2017-11-22 2018-04-24 宝鸡石油机械有限责任公司 A kind of subsea production tree petroleum pipeline assembly welding method
CN107953011B (en) * 2017-11-22 2020-04-24 宝鸡石油机械有限责任公司 Assembly welding method for oil pipeline of underwater Christmas tree
KR20210040548A (en) 2019-10-04 2021-04-14 대우조선해양 주식회사 Backing device for pipe welding and pipe welding method using the same
CN111230270A (en) * 2020-01-13 2020-06-05 海洋石油工程股份有限公司 Pipe test piece 2G circumferential weld argon arc welds inside shielding gas device
CN111230270B (en) * 2020-01-13 2021-07-20 海洋石油工程股份有限公司 Pipe test piece 2G circumferential weld argon arc welds inside shielding gas device
CN111168203A (en) * 2020-01-16 2020-05-19 海洋石油工程股份有限公司 Semi-automatic argon arc welding process for corrosion-resistant alloy composite pipe

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