CN112108785A - Welding method for plastic-coated pipe cabin penetrating piece and ship body - Google Patents
Welding method for plastic-coated pipe cabin penetrating piece and ship body Download PDFInfo
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- CN112108785A CN112108785A CN202010813233.9A CN202010813233A CN112108785A CN 112108785 A CN112108785 A CN 112108785A CN 202010813233 A CN202010813233 A CN 202010813233A CN 112108785 A CN112108785 A CN 112108785A
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- welding
- plastic
- coated pipe
- temperature
- ship body
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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
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/003—Cooling means
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- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
The invention discloses a welding method of a plastic-coated pipe cabin-penetrating piece and a ship body, wherein a welding seam needing to be welded is arranged between a composite plate of the plastic-coated pipe cabin-penetrating piece and a ship body structural plate, the inner wall of a plastic-coated pipe is a PE coating, and the welding method comprises the following steps: the welding seam is planned into a plurality of small-section welding seams which are connected end to end before welding; the temperature of the plastic-coated pipe is measured in real time, and meanwhile, the small-section welding lines are uniformly divided into a plurality of batches for welding; wherein, the small sections of welding seams welded in each batch are uniformly distributed on the whole welding seams, and the temperature of the plastic-coated pipe is cooled to normal temperature before the welding of each batch is started. The invention can control the temperature of the plastic-coated pipe penetrating member during welding, avoid the temperature exceeding the high temperature resistance limit of the plastic coating of the plastic-coated pipe and protect the plastic coating from being damaged.
Description
Technical Field
The invention belongs to the field of ship construction outfitting, and particularly relates to a method for welding a plastic-coated pipe cabin penetrating piece and a ship body.
Background
At present, a part of ships begin to adopt novel plastic-coated pipes, and the inner walls of the pipes are treated by Polyethylene (PE) plastic coating (PE linking). The PE coating enables the pipeline to have good corrosion resistance, but on the other hand, the PE coating cannot bear high temperature, and the surface temperature of the PE plastic-coated layer is required to be not more than 60 ℃ in the using process. This causes certain difficulty in welding the plastic-coated pipe cabin-penetrating member on the ship site with the ship structure. If the welding is carried out according to the conventional CO2 semi-automatic welding process, the temperature in the welding process cannot be controlled, and once the temperature limit is exceeded, the plastic coating layer is possibly failed to damage the plastic coated pipe.
Disclosure of Invention
The invention provides a welding method of a plastic-coated pipe cabin penetrating piece and a ship body, aiming at the problems in the prior art, and part of embodiments of the invention can control the temperature of the plastic-coated pipe cabin penetrating piece during welding, avoid the temperature exceeding the high temperature resistance limit of a plastic coating of the plastic-coated pipe and protect the plastic coating from being damaged.
In order to achieve the purpose, the invention adopts the following technical scheme:
a welding method for a plastic-coated pipe cabin-penetrating piece and a ship body is characterized in that a welding seam needing to be welded is arranged between a compound plate of the plastic-coated pipe cabin-penetrating piece and a ship body structural plate, and the inner wall of a plastic-coated pipe is a PE coating layer, and the welding method comprises the following steps: the welding seam is planned into a plurality of small-section welding seams which are connected end to end before welding; the temperature of the plastic-coated pipe is measured in real time, and meanwhile, the small-section welding lines are uniformly divided into a plurality of batches for welding; wherein, the small sections of welding seams welded in each batch are uniformly distributed on the whole welding seams, and the temperature of the plastic-coated pipe is cooled to normal temperature before the welding of each batch is started.
Preferably, the real-time measuring plastic-coated pipe comprises: and an infrared thermometer or a contact type thermometer is adopted to monitor the temperature of the inner wall of the plastic-coated pipe in real time.
Preferably, during the welding process, once the temperature of the inner wall of the plastic-coated pipe exceeds 55 degrees monitored in real time, the welding is stopped immediately.
Preferably, in the welding process, a fan or water is used for cooling the coating surface of the inner wall of the plastic coated pipe.
Preferably, the cooling the temperature of the plastic-coated pipe to the normal temperature before the welding of each batch starts comprises: and cooling the surface of the coating on the inner wall of the plastic-coated pipe by adopting a fan or water.
Preferably, the welding seams include an outer ring welding seam and an inner ring welding seam, and the outer ring welding seam is welded firstly and then the inner ring welding seam is welded according to the welding method.
Preferably, the current is controlled between 120 and 140A during welding.
Preferably, the length of the short section of the welding seam is 90-110 mm.
Preferably, the batch number is 3, and the outer ring weld joint and the inner ring weld joint are equally divided into 12 small-section weld joints.
Compared with the prior art, the invention has the beneficial effects that: tests show that the invention can prevent the temperature from rising too fast and too high when the plastic-coated pipe cabin-penetrating member is welded in the welding construction engineering, avoid the temperature from exceeding the high temperature resistance limit of the plastic coating of the plastic-coated pipe, avoid the plastic coating from being damaged, and better protect the plastic-coated pipe coating.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of welding of a plastic-coated pipe cabin-penetrating part composite plate and a ship structure.
FIG. 2 is a drawing showing the plastic-coated pipe penetration piece composite plate and ship body girth weld seam.
Fig. 3 is a sequence diagram of girth welding of the penetration member to the hull.
1-a compound plate of a cabin penetrating piece; 2-outer ring weld; 3-hull structural panels; 4-a welding area; 5-inner ring welding seam.
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 obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
As shown in fig. 1 to 3, the present embodiment provides a method for controlling welding temperature of a plastic-coated pipe penetration piece and a ship body of an LNG ship, comprising the following steps:
(1) the assembly and welding of the plastic-coated pipe cabin-penetrating part composite plate and the ship structure adopt CO2 semiautomatic welding, and welding wires adopt GFL-71 and the like (phi 1.0 mm).
(2) And (3) polishing and removing impurities such as paint, rust, moisture and the like in the range of 30mm of the area to be welded.
(3) Marks are made near the welding seams of the outer ring and the inner ring, the welding seams are symmetrically divided into 12 or more multi-section welding seams (see figure 2), and the length of each section of welding seam is about 100 mm.
(4) And controlling the current to be 120-140A during the welding of the composite plate, and adopting rapid welding.
(5) Welding the welding seam of the outer ring of the plate firstly and then welding the welding seam of the inner ring of the web plate.
(6) And (3) welding the outer ring welding seam 12 section (shown in figure 3) for three times, namely continuously welding for 3-9-5-11 times, cooling the inner wall of the pipe for at least 5min by adopting a fan, then welding for 1-7-4-10 times, cooling for at least 5min by adopting the fan, finally welding for 2-8-6-12 times, and cooling the inner wall of the pipe by adopting the fan after welding.
(7) And after the outer ring is welded, welding the inner ring after the surface of the inner wall coating of the plastic-coated pipe is cooled to normal temperature.
(8) And (3) welding the 12 sections of the inner ring welding seams in three times, and cooling the inner wall of the pipe by using a fan after the middle pause and the final welding are finished.
(9) During the assembling spot welding and the welding process, a temperature measuring instrument is required to monitor the temperature of the inner wall of the plastic-coated pipe at any time, an infrared scanning mode is adopted for temperature measurement, once the measured temperature of the inner wall of the plastic-coated pipe exceeds 55 ℃, the welding is stopped immediately, and the welding is carried out after the inner wall of the plastic-coated pipe is cooled to the normal temperature by a fan or tap water.
Although the present invention has been described in detail with respect to the above embodiments, it will be understood by those skilled in the art that modifications or improvements based on the disclosure of the present invention may be made without departing from the spirit and scope of the invention, and these modifications and improvements are within the spirit and scope of the invention.
Claims (9)
1. A welding method for a plastic-coated pipe cabin-penetrating piece and a ship body is characterized in that a welding seam needing to be welded is arranged between a compound plate of the plastic-coated pipe cabin-penetrating piece and a ship body structural plate, and a PE coating is arranged on the inner wall of a plastic-coated pipe, and the welding method comprises the following steps:
the welding seam is planned into a plurality of small-section welding seams which are connected end to end before welding;
the temperature of the plastic-coated pipe is measured in real time, and meanwhile, the small-section welding lines are uniformly divided into a plurality of batches for welding;
wherein, the small sections of welding seams welded in each batch are uniformly distributed on the whole welding seams, and the temperature of the plastic-coated pipe is cooled to normal temperature before the welding of each batch is started.
2. The method of claim 1, wherein the real-time measurement of the plastic-coated pipe comprises: and an infrared thermometer or a contact type thermometer is adopted to monitor the temperature of the inner wall of the plastic-coated pipe in real time.
3. The welding method of the plastic-coated pipe cabin-penetrating member and the ship hull as claimed in claim 2, wherein in the welding process, once the temperature of the inner wall of the plastic-coated pipe exceeds 55 degrees monitored in real time, the welding is stopped immediately.
4. The welding method of the plastic-coated pipe cabin-penetrating member and the ship body according to claim 3, wherein in the welding process, a fan or water is used for cooling the coating surface of the inner wall of the plastic-coated pipe.
5. The method of claim 4, wherein cooling the plastic-coated tube to ambient temperature before the welding of each batch begins comprises: and cooling the surface of the coating on the inner wall of the plastic-coated pipe by adopting a fan or water.
6. The method for welding the plastic-coated pipe cabin-penetrating member to the ship body according to claim 5, wherein the welding seams comprise an outer ring welding seam and an inner ring welding seam, and the outer ring welding seam is welded and then the inner ring welding seam is welded according to the welding method.
7. A method for welding a plastic-coated pipe penetration member to a ship hull according to any one of claims 1 to 6, wherein the current during welding is controlled to 120 to 140A.
8. The welding method of the plastic-coated pipe penetration piece and the ship hull according to any one of claims 1-6, wherein the length of the short section welding seam is 90-110 mm.
9. The welding method of the plastic-coated pipe cabin-penetrating member and the ship body according to any one of claim 6, wherein the batch number is 3, and the outer ring welding seam and the inner ring welding seam are both 12 small-section welding seams.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010813233.9A CN112108785A (en) | 2020-08-13 | 2020-08-13 | Welding method for plastic-coated pipe cabin penetrating piece and ship body |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010813233.9A CN112108785A (en) | 2020-08-13 | 2020-08-13 | Welding method for plastic-coated pipe cabin penetrating piece and ship body |
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| CN112108785A true CN112108785A (en) | 2020-12-22 |
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| CN202010813233.9A Pending CN112108785A (en) | 2020-08-13 | 2020-08-13 | Welding method for plastic-coated pipe cabin penetrating piece and ship body |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115502600A (en) * | 2022-10-26 | 2022-12-23 | 沪东中华造船(集团)有限公司 | Method for assembling and welding inner plastic coated pipe web |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2335519A1 (en) * | 1998-06-29 | 2000-01-06 | The Idod Trust | Methods and apparatus for coating the seams of welded tubes |
| CN107701857A (en) * | 2017-11-16 | 2018-02-16 | 北京首钢建设集团有限公司 | Internal plastic coating steel pipe Crater antiseptic processing method |
| CN109108515A (en) * | 2018-10-30 | 2019-01-01 | 广船国际有限公司 | A kind of installation method of steamer oil pipe |
| CN111442139A (en) * | 2020-04-17 | 2020-07-24 | 中船黄埔文冲船舶有限公司 | Plastic-coated pipe cabin penetrating piece and welding method |
-
2020
- 2020-08-13 CN CN202010813233.9A patent/CN112108785A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2335519A1 (en) * | 1998-06-29 | 2000-01-06 | The Idod Trust | Methods and apparatus for coating the seams of welded tubes |
| CN107701857A (en) * | 2017-11-16 | 2018-02-16 | 北京首钢建设集团有限公司 | Internal plastic coating steel pipe Crater antiseptic processing method |
| CN109108515A (en) * | 2018-10-30 | 2019-01-01 | 广船国际有限公司 | A kind of installation method of steamer oil pipe |
| CN111442139A (en) * | 2020-04-17 | 2020-07-24 | 中船黄埔文冲船舶有限公司 | Plastic-coated pipe cabin penetrating piece and welding method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115502600A (en) * | 2022-10-26 | 2022-12-23 | 沪东中华造船(集团)有限公司 | Method for assembling and welding inner plastic coated pipe web |
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Application publication date: 20201222 |
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