CN110899911B - Welding deformation control process for large-diameter maintenance cover mounting base of LNG ship cabin - Google Patents
Welding deformation control process for large-diameter maintenance cover mounting base of LNG ship cabin Download PDFInfo
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- CN110899911B CN110899911B CN201911003871.8A CN201911003871A CN110899911B CN 110899911 B CN110899911 B CN 110899911B CN 201911003871 A CN201911003871 A CN 201911003871A CN 110899911 B CN110899911 B CN 110899911B
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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
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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
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- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention relates to a welding deformation control process for an installation base of a large-caliber maintenance cover of an LNG ship cabin, which comprises the following steps: unscrewing a bolt for connecting the cover of the maintenance cover and the base, separating the cover from the base, and taking off the rubber gasket; marking out a base mounting position line and mounting a base; inspecting the installation size of the base; welding the inner and outer circles of the base diagonally, wherein the welding current and voltage refer to the welding process specification; and after welding, reinstalling the rubber gasket and the maintenance cover. The invention has the advantages of controlling the welding deformation of the base of the maintenance cover, meeting the installation requirements, along with simple operation and higher practicability.
Description
Technical Field
The invention relates to the field of ship construction, in particular to a welding deformation control process for an installation base of a large-diameter maintenance cover of an LNG ship cabin.
Background
The maintenance cover of the marine engine room is a cover of a channel when a host machine in the engine room is hoisted out for maintenance, and needs to be preassembled in place in a section construction stage. The maintenance cover and the structure are installed in a mode that the inner ring and the outer ring of the base are connected with the structure through fillet welds, in order to guarantee sufficient welding, the cover of the maintenance cover needs to be detached, and after the base and the structure of the maintenance cover are welded, the cover is installed on the base. The maintenance cover has the characteristics that the caliber is larger, the base is of a frame structure, and welding deformation is easy to generate and is difficult to control when only the base is installed.
The process mainly researches how to control the welding deformation of the base through correct welding sequence and welding parameters, so that the installation precision of the maintenance cover meets the requirement.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a welding deformation control process for a large-caliber maintenance cover of an LNG ship cabin, which is used for solving the problem that the welding deformation of a base can not meet the installation precision of the maintenance cover, and the technical purpose of the invention is realized by the following technical scheme:
a welding deformation control process for an installation base of a large-diameter maintenance cover of an LNG ship cabin comprises the following steps:
s1, separating the maintenance cover from the base, and taking down the rubber gasket;
s2, marking a base mounting position line on the structural panel, checking the mounting size of the base, and mounting the base at the base mounting position;
s3, welding the base and the structural panel by adopting a diagonal welding method;
and S4, installing a rubber gasket after welding is finished, and installing the maintenance cover on the base.
Further, in S2, the base is mounted on the base mounting position by tack welding.
Furthermore, the length of the tack welding is 30-50mm, and the tack welding distance is 300-500 mm.
Further, the step S3 specifically includes the following steps:
s5, alternately welding the corners of 2 bases at opposite angles by adopting inner rings and outer rings, and then alternately welding the corners of the other two bases at opposite angles inside and outside;
and S6, carrying out same-side welding on the diagonal positions, carrying out same-side welding on the next pair of diagonal positions after clockwise or anticlockwise rotation, and carrying out rotary welding for one circle.
And S7, adopting a diagonal welding method to rotate and weld the rest parts clockwise or anticlockwise according to the method of S6.
Further, after the welding is completed for one segment in S3, the position to be welded is completely cooled and then the next segment is welded.
Further, the current for welding in S3 is 200-250A, and the welding voltage is 24-26V.
Further, in the step S3, the welding is performed by multiple layers and multiple passes.
The diagonal welding method has the advantages that the diagonal welding is alternately carried out, so that the stress deformation of the base caused by welding is effectively reduced, the accuracy of the base on the installation position of the base is ensured, the follow-up maintenance cover can be accurately installed on the base, and the diagonal welding method is simple to operate, remarkable in effect and high in practicability.
Drawings
FIG. 1 is a schematic view of welding of an inner ring in a region a and an outer ring in a region g.
Fig. 2 is a schematic view of the completion of welding in the region a and the region g.
Fig. 3 is a schematic view of the completion of the welding at the corners of the base.
FIG. 4 is a schematic view of the welding of the inner ring in the region l and the inner ring in the region f.
FIG. 5 is a schematic view of the welding of the k-region outer ring and the e-region outer ring.
FIG. 6 is a schematic view of welding of the h-region outer ring and the b-region outer ring.
Detailed Description
The technical solution of the present invention is further described below with reference to specific embodiments:
example 1
A welding deformation control process for an installation base of a large-diameter maintenance cover of an LNG ship cabin comprises the following steps:
s1, mounting the general maintenance cover on the base in advance, unscrewing a bolt for connecting the maintenance cover and the base during welding, separating the maintenance cover from the base, and taking down the rubber gasket to facilitate welding and fixing the base;
and S2, marking a base mounting position line on the structural panel, placing the base at the base mounting position, checking whether the mounting sizes of the base and the marked base mounting position line are matched, and positioning and welding the base after the mounting sizes are confirmed to be correct.
CO for tack welding2The length of the positioning welding is 30-50mm, the distance of the positioning welding is 300-500mm, the welding current is 200-250A, and the welding voltage is 24-26V.
S3, dividing the base into 12 regions according to the welding length of the outer ring, marking the regions as a, b, c, d, e, f, g, h, i, j, k and l in turn clockwise, as shown in figures 1-6, carrying out construction welding by one person, welding the base and the structural panel by adopting a diagonal welding method, and adopting CO likewise2Gas shielded welding, the diameter of the welding wire is 1.2mm, the welding current is within the range of 200-250A, the welding voltage is 24-26V, and multilayer multi-pass welding is adopted for welding, specifically speakingThe following:
s5, firstly welding the inner ring of the area a, after the section is welded and cooled, welding the outer ring of the area G, as shown in figure 1, welding the outer ring of the area a after cooling, welding the inner ring of the area G after cooling, as shown in figure 2, and finishing the alternate welding of the inner ring and the outer ring at the corners of 2 bases at diagonal positions after cooling; according to the method, the j-area inner ring, the d-area outer ring, the j-area outer ring and the d-area inner ring are welded, and the next welding is carried out after each welding is finished and cooled, as shown in fig. 3.
S6, welding the inner ring in the area I, welding the inner ring in the area f after cooling, rotating clockwise after cooling as shown in FIG. 4, welding the outer ring in the area e, welding the outer ring in the area k after cooling, and cooling as shown in FIG. 5; rotating clockwise, welding the inner ring in the i area, cooling, and welding and cooling the inner ring in the c area; and rotating clockwise again, welding and cooling the outer ring of the h area, and then welding and cooling the outer ring of the b area, wherein the outer ring rotates clockwise once, as shown in figure 6.
S7, welding and cooling the outer ring of the area I, and then welding and cooling the outer ring of the area f; rotating anticlockwise, welding and cooling the inner ring in the h area, and then welding and cooling the inner ring in the b area; rotating counterclockwise, welding and cooling the outer ring of the i area, and welding and cooling the outer ring of the c area; and rotating counterclockwise, welding and cooling the inner ring in the k area, welding and cooling the inner ring in the e area, and completely finishing the welding of the whole base.
Note that in the welding process, the welding at the diagonal positions is not in sequence, for example, in S5, the outer ring in the g region may be welded first, and the inner ring in the a region may be welded after cooling; for example, in S6, the inner ring in the region f may be welded first, and then the inner ring in the region l may be welded after cooling; for example, in S7, the outer ring in the f region may be welded, and then the outer ring in the l region may be welded after cooling.
And S4, reinstalling the rubber gasket after welding, and installing the maintenance cover on the base to check whether the base meets the requirements.
Example 2
The difference from the embodiment 1 is that the embodiment adopts two workers to perform welding operation, specifically, the welding deformation control process for the installation base of the large-caliber maintenance cover of the LNG ship cabin comprises the following steps:
s1, mounting the general maintenance cover on the base in advance, unscrewing a bolt for connecting the maintenance cover and the base during welding, separating the maintenance cover from the base, and taking down the rubber gasket to facilitate welding and fixing the base;
and S2, marking a base mounting position line on the structural panel, placing the base at the base mounting position, checking whether the mounting sizes of the base and the marked base mounting position line are matched, and positioning and welding the base after the mounting sizes are confirmed to be correct.
CO for tack welding2The length of the positioning welding is 30-50mm, the distance of the positioning welding is 300-500mm, the welding current is 200-250A, and the welding voltage is 24-26V.
S3, dividing the base into 12 regions according to the welding length of the outer ring, marking the regions as a, b, c, d, e, f, g, h, i, j, k and l in turn clockwise, as shown in figures 1-6, in the embodiment 2, carrying out construction welding by individuals, welding the base and the structural panel by adopting a diagonal welding method, and adopting CO in the same way2The welding wire diameter is 1.2mm, the welding current is within the range of 200-250A, the welding voltage is 24-26V, and multilayer multi-pass welding is adopted in the gas shielded welding, which comprises the following steps:
s5, respectively welding the inner ring in the area a and the outer ring in the area g simultaneously by two workers, respectively welding the outer ring in the area a and the inner ring in the area g simultaneously by the two workers after the section is welded and cooled as shown in figure 1, and cooling, and as shown in figure 2, alternately welding the inner ring and the outer ring at the corners of 2 bases at diagonal positions; according to the method, the j-area inner ring, the d-area outer ring, the j-area outer ring and the d-area inner ring are welded, and the next welding is carried out after each welding is finished and cooled, as shown in fig. 3.
S6, welding the inner ring in the area I and the inner ring in the area f simultaneously by two workers respectively, and rotating clockwise after cooling as shown in FIG. 4; respectively welding the outer ring of the e area and the outer ring of the k area by two workers at the same time, and rotating clockwise after cooling; the two workers respectively weld the inner ring in the i area and the inner ring in the c area at the same time, and rotate clockwise after cooling; and the two workers respectively weld the outer ring of the h area and the outer ring of the b area at the same time, rotate clockwise for one circle at the moment, and perform the next operation after cooling.
S7, respectively welding the outer ring of the area l and the outer ring of the area f simultaneously by two workers, and rotating counterclockwise after cooling; respectively welding the inner ring in the h area and the inner ring in the b area by two workers at the same time, rotating counterclockwise after cooling, welding and cooling the outer ring in the i area, and welding and cooling the outer ring in the c area; rotating counterclockwise; and respectively welding the inner ring in the k area and the inner ring in the e area by two workers at the same time, and completely welding the whole base after cooling.
And S4, reinstalling the rubber gasket after welding, and installing the maintenance cover on the base to check whether the base meets the requirements.
The present invention is further explained and not limited by the embodiments, and those skilled in the art can make various modifications as necessary after reading the present specification, but all the embodiments are protected by the patent law within the scope of the claims.
Claims (5)
1. The welding deformation control process for the large-caliber maintenance cover mounting base of the LNG ship cabin is characterized by comprising the following steps of:
s1, separating the maintenance cover from the base, and taking down the rubber gasket;
s2, marking a base mounting position line on the structural panel, checking the mounting size of the base, and mounting the base at the base mounting position;
s3, welding the base and the structural panel by adopting a diagonal welding method;
s3 includes the following steps:
s5, alternately welding the corners of 2 bases at opposite angles by adopting inner rings and outer rings, and then alternately welding the corners of the other two bases at opposite angles inside and outside;
s6, carrying out same-side welding on the diagonal positions, carrying out same-side welding on the next pair of diagonal positions after clockwise or anticlockwise rotation, and carrying out rotary welding for one circle;
s7, adopting a diagonal welding method to rotate and weld the rest parts clockwise or anticlockwise according to the method of S6;
and S4, installing a rubber gasket after welding is finished, and installing the maintenance cover on the base.
2. The welding deformation control process for the installation base of the large-diameter maintenance cover of the LNG ship cabin of claim 1, wherein in the step S2, the base is installed at the installation position of the base by using a tack welding method.
3. The welding deformation control process for the installation base of the large-diameter maintenance cover of the LNG ship cabin as claimed in claim 2, wherein the tack weld length is 30-50mm, and the tack weld spacing is 300-500 mm.
4. The welding deformation control process for the installation base of the large-caliber maintenance cover of the LNG ship cabin according to claim 1, wherein in S3, after one section is welded, the position to be welded is completely cooled, and then the next section is welded.
5. The welding deformation control process for the installation base of the large-diameter maintenance cover of the LNG ship cabin as claimed in claim 1, wherein the welding current in S3 is 200-250A, and the welding voltage is 24-26V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911003871.8A CN110899911B (en) | 2019-10-22 | 2019-10-22 | Welding deformation control process for large-diameter maintenance cover mounting base of LNG ship cabin |
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| CN201911003871.8A CN110899911B (en) | 2019-10-22 | 2019-10-22 | Welding deformation control process for large-diameter maintenance cover mounting base of LNG ship cabin |
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| CN110899911A CN110899911A (en) | 2020-03-24 |
| CN110899911B true CN110899911B (en) | 2021-12-21 |
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| CN114749821B (en) * | 2022-05-25 | 2023-05-05 | 武汉中谷联创光电科技股份有限公司 | Welding method |
| CN115302117B (en) * | 2022-08-10 | 2024-01-30 | 广州文冲船厂有限责任公司 | Square window installation method |
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