CN111037043B - Liquefied gas ship outfield welding process - Google Patents
Liquefied gas ship outfield welding process Download PDFInfo
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- CN111037043B CN111037043B CN201911382181.8A CN201911382181A CN111037043B CN 111037043 B CN111037043 B CN 111037043B CN 201911382181 A CN201911382181 A CN 201911382181A CN 111037043 B CN111037043 B CN 111037043B
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- welding
- molten pool
- arc
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- liquefied gas
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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
Abstract
The invention discloses a liquefied gas ship outfield welding process, which relates to the technical field of welding and comprises the following steps: s1, when backing welding is carried out at the position of 5-7 o 'clock, a welding gun starts welding from the direction of 6 o' clock, the welding is kept for 2-3 seconds, and the electric arc swings left and right slightly; s2, after a penetrating molten pool is formed, quickly adding 1-2 drops of welding wires into the molten pool; s3, using the action of electric arc pushing force to make the back surface well formed; s4, rapidly breaking the arc for 0.5 +/-0.15 seconds after the first molten pool is formed, and controlling the heat of the welding seam to be lower than the melting temperature of the molten pool; and S5, starting arc immediately before the molten pool is not completely cooled, and welding a second molten pool. Aiming at the problem that the welding seam has the defect of indent in the backing weld in the prior art, the invention aims to provide a liquefied gas carrier outfield welding process which effectively avoids the defect of indent in the welding seam in the backing weld.
Description
Technical Field
The invention relates to the technical field of welding, in particular to a welding process for an external field of a liquefied gas carrier.
Background
With the development of economy, the energy demand is increasing day by day, and the liquefied gas carrier is widely used. Due to the particularity and the danger of the loading medium of the liquefied gas carrier, higher requirements are put forward on the product material and the welding quality. The liquefied pipeline system is made of O0Cr17Ni14Mo2, and has the characteristics of plasticity, initial performance, weldability and corrosion resistance superior to other stainless steel materials. 316L welding material is selected and 100% first-grade nondestructive inspection is carried out on the aspect of welding quality requirement, but the difficulty is encountered in the actual production process of the liquefied gas carrier during 16000m high-speed transportation.
Because the outfield working environment is poor, the welding difficulty is high, and the welding shooting qualification rate is not effectively improved all the time. Particularly, the welding problem of the pipelines mainly with 168X 3mm is the most. The defects of most inner concaves reflected on the sheet are reflected, and for the problems generated in the aspect, the following reasons are summarized through the analysis of constructors and the experience of our daily work: when backing welding is carried out, the current at the 5-7 o' clock position of the welding line is overlarge, the retention time is long, and the welding line is concave at the position.
Disclosure of Invention
Aiming at the problem that the welding seam has the defect of indent in the backing weld in the prior art, the invention aims to provide a liquefied gas carrier outfield welding process which effectively avoids the defect of indent in the welding seam in the backing weld.
In order to achieve the purpose, the invention provides the following technical scheme:
a liquefied gas ship outfield welding process comprises the following steps:
s1, when backing welding is carried out at the position of 5-7 o 'clock, a welding gun starts welding from the direction of 6 o' clock, the welding is kept for 2-3 seconds, and the electric arc swings left and right slightly;
s2, after a penetrating molten pool is formed, quickly adding 1-2 drops of welding wires into the molten pool;
s3, using the action of electric arc pushing force to make the back surface well formed;
s4, rapidly breaking the arc for 0.5 +/-0.15 seconds after the first molten pool is formed, and controlling the heat of the welding seam to be lower than the melting temperature of the molten pool;
and S5, starting arc immediately before the molten pool is not completely cooled, and welding a second molten pool.
By adopting the technical scheme, 1-2 drops of welding wires are added to increase the surface tension of the molten pool; and (3) rapidly breaking the arc for 0.5 +/-0.15 seconds after the first molten pool is formed so as to reduce the temperature of the molten pool, controlling the heat of the welding seam below the melting temperature of the molten pool, and starting the arc immediately before the molten pool is not completely cooled so as to weld the second molten pool. The invention well solves the problem that the weld joint loses the effective balance effect on the arc thrust and the gravity of the metal in the molten pool due to high heat and increased surface tension of the molten pool, so that the metal in the molten pool flows downwards to form an inward concave phenomenon.
The present invention in a preferred example may be further configured to: before the welding operation is carried out, the periphery of the welding area is surrounded by the three-proofing cloth to form a relatively closed space.
By adopting the technical scheme, the side wind is prevented from entering, and a large amount of air enters the molten pool to form air holes in the welding process.
The present invention in a preferred example may be further configured to: in backing welding, the welding current is 110-120A, the arc voltage is 13-15V, the groove is V-shaped, the gap is 0-1mm, the argon flow is 10-14L/min, and the diameter of the welding wire is 2.0 mm.
By adopting the technical scheme, the reasonable welding process is adopted to ensure the process quality of backing welding.
The present invention in a preferred example may be further configured to: in backing welding, the welding speed is 6-7 cm/min.
By adopting the technical scheme, the welding speed is matched with the cooling speed of the molten pool, so that trace gas in the welding seam can escape conveniently in enough time, and the formation of air holes at the welding seam is avoided.
The present invention in a preferred example may be further configured to: and performing cover surface welding outside the priming layer, wherein the cover surface welding adopts a spot welding and wire adding method.
By adopting the technical scheme, the cover welding is implemented by adopting a spot welding and wire adding method, so that the molten pool is favorably and fully dissolved, and the molten pool is fully dissolved with the priming layer, and welding seam air holes or interlayers are avoided between the priming layer and the cover layer.
The present invention in a preferred example may be further configured to: in the cover surface welding, the welding current is 100-110A, the arc voltage is 12V, the welding speed is 5-6cm/min, and the diameter of the welding wire is 2.4 mm.
By adopting the technical scheme, the reasonable welding process is adopted to ensure the process quality of the cover surface welding.
The present invention in a preferred example may be further configured to: the spot welding wire adding method comprises the following steps:
after the welding seam of the cover surface is arc-initiated, the electric arc swings left and right to form an effective welding molten pool;
after the molten pool is formed, 2-3 drops of molten pool metal with enough quantity are dropped from the edge of the welding line, the electric arc swings left and right in a straight line, the molten drops are fully melted, and then the welding operation of the next molten pool is carried out;
the height of the welding seam cover face is generally controlled between 0.5 mm and 1 mm.
By adopting the technical scheme, the cover welding is implemented by adopting a spot welding and wire adding method, so that the molten pool is favorably and fully dissolved, and the molten pool is fully dissolved with the priming layer, and welding seam air holes or interlayers are avoided between the priming layer and the cover layer.
The present invention in a preferred example may be further configured to: and (4) removing the assembly welding spots and the oxidation slag by using an angle grinder.
By adopting the technical scheme, pores and oxidizing slag on welding spots are avoided.
The present invention in a preferred example may be further configured to: the welding gun is a small welding gun.
By adopting the technical scheme, the device is favorable for placing difficult positions and is convenient for welding through the welding seam.
In summary, the invention includes at least one of the following beneficial technical effects:
(1) adding 1-2 drops of welding wire to increase the surface tension of a molten pool; rapidly breaking the arc for 0.5 +/-0.15 seconds after the first molten pool is formed so as to reduce the temperature of the molten pool, controlling the heat of a welding seam below the melting temperature of the molten pool, starting the arc immediately before the molten pool is not completely cooled, and welding a second molten pool; the invention well solves the problem that the weld joint loses the effective balance effect on the arc thrust and the gravity of the metal in the molten pool due to high heat and increased surface tension of the molten pool, so that the metal in the molten pool flows downwards to form an inward concave phenomenon;
(2) furthermore, the welding quality is improved by adopting reasonable welding process parameters, wherein the welding speed is matched with the cooling speed of a molten pool, so that trace gas in a welding seam can escape in enough time;
(3) furthermore, the cover welding adopts a spot welding and wire adding method, which is beneficial to fully dissolving the molten pool and fully fusing with the priming layer so as to avoid weld seam air holes or interlayers between the priming layer and the cover layer.
Drawings
FIG. 1 is a block flow diagram of the present embodiment;
FIG. 2 is a cross-sectional view at the broken arc weld pool.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
A liquefied gas carrier outfield welding process, referring to fig. 1 and 2, comprising the steps of:
s1, surrounding the welding area with three-yellow cloth to form a relatively closed space to prevent cross wind from entering and to prevent a large amount of air from entering the molten pool to form air holes in the welding process;
when backing welding is carried out at the position of 5-7 o 'clock, an arc breaking operation method is adopted, wherein the main operation method comprises the steps that a welding gun starts welding from the direction of 6 o' clock, stays for 2-3 seconds, and an electric arc swings left and right slightly;
s2, after a penetrating molten pool is formed, rapidly adding 1-2 drops of welding wires into the molten pool to increase the surface tension of the molten pool;
s3, using the action of electric arc pushing force to make the back surface well formed;
and S4, rapidly breaking the arc for 0.5 +/-0.15 seconds after the first molten pool is formed so as to reduce the temperature of the molten pool and control the heat of the welding seam below the melting temperature of the molten pool.
And S5, starting arc immediately before the molten pool is not completely cooled, and welding a second molten pool.
By using the arc-breaking welding operation method, the problem that the weld joint loses the effective balance effect on the arc thrust and the gravity of the metal in the molten pool due to high heat and increased surface tension of the molten pool, so that the metal in the molten pool flows down to form an inward concave phenomenon is well solved.
The backing welding operation comprises the following process parameters:
| hierarchy | Welding current A | Arc voltage V | Welding speed cm/min | Groove form | Gap mm | Argon flow L/min | Diameter mm of welding wire |
| Priming layer | 110-120 | 13-15 | 6-7 | V type | 0-1 | 10-14 | 2.0 |
Wherein, reasonable welding speed is adopted to match with the cooling speed of the molten pool, so that trace gas in the welding seam has enough time to escape.
Performing cover surface welding outside the priming layer, wherein the cover surface welding adopts a spot welding wire adding method, and the spot welding wire adding method comprises the following steps:
after the welding seam of the cover surface is arc-initiated, the electric arc swings left and right to form an effective welding molten pool; after the molten pool is formed, 2-3 drops of molten pool metal with enough quantity are dropped from the edge of the welding line, the electric arc swings left and right in a straight line, the molten drops are fully melted, and then the welding operation of the next molten pool is carried out; the height of the welding seam cover face is generally controlled between 0.5 mm and 1 mm.
The method for adding the silk notes: firstly, a welding wire adding method is adopted for the left edge and the right edge of a welding seam; secondly, the dropping transition is mainly used when welding wires are added; thirdly, the welding wire is required to be fully melted after being dropped.
The adoption of spot welding and wire adding method is favorable for the full melting of the melting pool and the full fusion with the priming layer, so as to avoid the occurrence of welding seam air holes or interlayers between the priming layer and the cover surface layer.
The cover welding operation comprises the following technological parameters:
| hierarchy | Welding current A | Arc voltage V | Welding speed cm/min | Diameter mm of welding wire |
| Cover layer | 100-110 | 12 | 5-6 | 2.4 |
Due to poor welding position or the existence of obstacles, the position of a welding gun is difficult to align, and the occurrence of incomplete welding seams is often caused.
And an angle grinder is adopted to remove assembly welding spots and oxidation slag so as to avoid pores and oxidation slag on the welding spots.
In summary, the following steps:
when the invention is used, the one-time qualification rate of the welding shooting is obviously improved by reasonably improving the welding process measures and adopting effective prevention means, and the qualification rate is improved from 81 percent to 98 percent. Avoids the reduction of material performance caused by the repeated repair process of the welding line. The phase change improves the production efficiency, reduces the labor intensity, well ensures the product quality, improves the reputation of enterprises and enables the companies to be in an advantageous position in peer competition.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (4)
1. The liquefied gas ship outfield welding process is characterized by comprising the following steps of:
s1, when backing welding is carried out at the position of 5-7 o 'clock, a welding gun starts welding from the direction of 6 o' clock, the welding is kept for 2-3 seconds, and the electric arc swings left and right slightly;
s2, after a penetrating molten pool is formed, quickly adding 1-2 drops of welding wires into the molten pool;
s3, using the action of electric arc pushing force to make the back surface well formed;
s4, rapidly breaking the arc for 0.5 +/-0.15 seconds after the first molten pool is formed, and controlling the heat of the welding seam to be lower than the melting temperature of the molten pool;
s5, starting arc immediately before the molten pool is not completely cooled, and welding a second molten pool;
in backing welding, the welding speed is 6-7 cm/min;
performing cover surface welding outside the priming layer, wherein the cover surface welding adopts a spot welding and wire adding method;
the spot welding wire adding method comprises the following steps:
after the welding seam of the cover surface is arc-initiated, the electric arc swings left and right to form an effective welding molten pool;
after the molten pool is formed, 2-3 drops of molten pool metal are dropped from the edge of the welding line, the electric arc swings left and right in a straight line, the molten drops are fully melted, and then the welding operation of the next molten pool is carried out;
the height of the welding seam cover surface is controlled between 0.5 mm and 1 mm;
in backing welding, welding current 110-120A and arc voltage 13-15V are adopted, the groove is V-shaped, the gap is 0-1mm, the argon flow is 10-14L/min, and the diameter of a welding wire is 2.0 mm;
in the cover surface welding, the welding current is 100-110A, the arc voltage is 12V, the welding speed is 5-6cm/min, and the diameter of the welding wire is 2.4 mm.
2. The liquefied gas carrier outfield welding process of claim 1, wherein before the welding operation is performed, a relatively closed space is formed by surrounding the welding area with a three-proof cloth.
3. The liquefied gas carrier outfield welding process according to claim 1, wherein an angle grinder is used to remove the assembly welding spots and the oxidized slag.
4. The liquefied gas carrier outfield welding process according to claim 1, wherein the welding gun is a small welding gun.
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| CN201911382181.8A CN111037043B (en) | 2019-12-27 | 2019-12-27 | Liquefied gas ship outfield welding process |
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| CN201911382181.8A CN111037043B (en) | 2019-12-27 | 2019-12-27 | Liquefied gas ship outfield welding process |
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| CN111037043A CN111037043A (en) | 2020-04-21 |
| CN111037043B true CN111037043B (en) | 2021-09-03 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102837115A (en) * | 2012-09-27 | 2012-12-26 | 中国化学工程第三建设有限公司 | Seamless welding method for aluminum and aluminum alloy or pipeline |
| CN102922153A (en) * | 2012-11-27 | 2013-02-13 | 哈尔滨工业大学 | Laser guide GMAW (Gas Metal Arc Welding) electric arc compound transverse welding method |
| CN103785929A (en) * | 2014-01-15 | 2014-05-14 | 上海交通大学 | GMAW horizontal welding method for board with large thickness |
| CN206047386U (en) * | 2016-06-30 | 2017-03-29 | 广东省焊接技术研究所（广东省中乌研究院） | A kind of plasma MIG composite welding pipette tips of marine aluminium alloy |
| CN108356387A (en) * | 2018-05-11 | 2018-08-03 | 大连理工大学 | A kind of welding pool stability regulation and control method and its application based on twin arc vibration |
-
2019
- 2019-12-27 CN CN201911382181.8A patent/CN111037043B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102837115A (en) * | 2012-09-27 | 2012-12-26 | 中国化学工程第三建设有限公司 | Seamless welding method for aluminum and aluminum alloy or pipeline |
| CN102922153A (en) * | 2012-11-27 | 2013-02-13 | 哈尔滨工业大学 | Laser guide GMAW (Gas Metal Arc Welding) electric arc compound transverse welding method |
| CN103785929A (en) * | 2014-01-15 | 2014-05-14 | 上海交通大学 | GMAW horizontal welding method for board with large thickness |
| CN206047386U (en) * | 2016-06-30 | 2017-03-29 | 广东省焊接技术研究所（广东省中乌研究院） | A kind of plasma MIG composite welding pipette tips of marine aluminium alloy |
| CN108356387A (en) * | 2018-05-11 | 2018-08-03 | 大连理工大学 | A kind of welding pool stability regulation and control method and its application based on twin arc vibration |
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| CN111037043A (en) | 2020-04-21 |
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