CN108637510B - Welding method of marine vertical ladder - Google Patents
Welding method of marine vertical ladder Download PDFInfo
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- CN108637510B CN108637510B CN201810382527.3A CN201810382527A CN108637510B CN 108637510 B CN108637510 B CN 108637510B CN 201810382527 A CN201810382527 A CN 201810382527A CN 108637510 B CN108637510 B CN 108637510B
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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
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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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/047—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work moving work to adjust its position between soldering, welding or cutting steps
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- Optics & Photonics (AREA)
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- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention provides a welding method of a marine vertical ladder, which is characterized by comprising the following steps of: providing two ladder frames and a plurality of square steel steps, and uniformly inserting the square steel steps into the two ladder frames at equal intervals; fixing the ladder frame according to the side standing position; performing pre-welding treatment on the ladder frame and the square steel steps; welding the joints of the second inner side surface of the ladder frame and the plurality of square steel steps and the joints of the first outer side surface of the ladder frame and the plurality of square steel steps in a staggered welding mode; the method comprises the following steps that a ladder frame to be welded and a plurality of square steel steps are turned over for 180 degrees, and joints of a first inner side face of the ladder frame to be welded and the square steel steps and joints of a second outer side face of the ladder frame to be welded and the square steel steps are welded in a staggered welding mode; and detecting the welded ladder frame and the plurality of square steel steps.
Description
Technical Field
The invention relates to the technical field of welding materials, in particular to a welding method of a marine straight ladder.
Background
In ship manufacturing enterprises, a ship vertical ladder is a common vertical passage facility in a ship, and is commonly used for access places of liquid tanks, empty tanks and other workers. Among the prior art, marine vertical ladder includes that ladder frame and square steel mark time, when welding marine vertical ladder, at first keeps flat with marine vertical ladder, marks time inboard and the outside of junction to ladder frame and square steel and welds after that, overturns marine vertical ladder and obtains marine vertical ladder's opposite side again, welds the inboard and the outside of marine vertical ladder's opposite side. Because the surface unevenness that the square steel was marked time, and mainly mark time to ladder frame and square steel through climbing welding among the prior art and weld to welding weld bath is piled up appears in the welded connection department that ladder frame and square steel marked time easily, and is higher to welder's welding level requirement, and welds marine vertical ladder through above-mentioned welding mode, and welding efficiency is lower, and the welding appearance is not pleasing to the eye, and the work load of polishing after the welding is great.
Disclosure of Invention
Based on the above, the invention aims to provide a welding method of a marine straight ladder, which can not only improve the welding quality, reduce the welding level requirement on a welder and reduce the polishing workload after welding, but also improve the welding efficiency and the appearance attractiveness of the marine straight ladder after welding.
The technical scheme of the invention is as follows: a welding method of a marine vertical ladder comprises the following steps:
s1, providing two ladder frames and a plurality of square steel steps, and uniformly inserting the square steel steps into the two ladder frames at equal intervals;
s2, fixing the ladder frame according to the side standing position;
s3, performing pre-welding treatment on the ladder frame and the square steel step to be welded;
s4, welding the joints of the second inner side surface of the ladder frame to be welded and the plurality of square steel steps and the joints of the first outer side surface of the ladder frame and the plurality of square steel steps in a staggered welding mode;
s5, overturning the ladder frame to be welded and the square steel steps for 180 degrees, and welding the joints of the first inner side surface of the ladder frame to be welded and the square steel steps and the joints of the second outer side surface of the ladder frame to be welded and the square steel steps in a staggered welding mode;
and S6, detecting the welded ladder frame and the plurality of square steel steps.
Optionally, in the step S1, one end of each square steel step passes through the first outer side surface of the ladder rack and is 4mm away from the first outer side surface of the ladder rack, and the other end of each square steel step passes through the second outer side surface of the ladder rack and is 4mm away from the second outer side surface of the ladder rack.
Optionally, in step S2, the ladder rack is fixed to the side wall by a rack.
Optionally, in step S3, the pre-welding treatment includes detecting an assembly gap between the ladder rack and the square steel step, and cleaning a groove at a joint of the ladder rack and the square steel step.
Optionally, in the steps S4 and S5, CO is used between the ladder rack and the plurality of square steel steps2The welding method of gas shielded welding is used for welding.
Optionally, when the thickness of the ladder frame to be welded is 8-10 mm, the CO is added2The diameter of a welding wire adopted by gas shielded welding is 1.2mm, the welding current intensity is 180-230A, the welding voltage intensity is 24-26V, and the welding gas flow is 18-20L/min.
Optionally, in step S5, performing nondestructive testing on the welded ladder rack and the plurality of square steel steps.
The embodiment of the invention has the following beneficial effects:
according to the welding method of the marine straight ladder, the square steel steps are obliquely arranged on the ladder frame, the ladder frame is fixed according to the side-standing position, the marine straight ladder to be welded is fixed according to the side-standing position, and when a welder welds the square steel steps and the ladder frame, the welding mode is flat welding, so that the whole welding process can be better controlled, the welding efficiency is higher, the welding difficulty is greatly reduced, the welding level requirement on the welder is reduced, and the condition that a welding molten pool is accumulated is avoided; the method has the advantages that the ladder frame and the square steel steps to be welded are subjected to pre-welding treatment, so that oxide films and oil stains on the surfaces of the square steel steps and the ladder frame can be removed, and air holes and slag inclusion on the surfaces of the square steel steps and the ladder frame are prevented; by adopting the staggered welding mode at the joint of the second inner side surface of the ladder frame to be welded and the square steel steps and the joint of the first outer side surface of the ladder frame and the square steel steps, when different square steel steps and ladder frames are welded, firstly, the square steel steps positioned in the middle are welded with the ladder frame, and then, the square steel steps and the ladder frames are welded in a staggered mode from two sides, so that the irregular deformation at the welding position of the square steel steps and the ladder frames can be reduced, the rigidity and the strength of the square steel steps and the ladder frames are improved, the polishing workload after welding is reduced, and the appearance attractiveness of the square steel steps and the ladder frames after welding is improved; the welding connection positions of the ladder frame and the square steel steps after welding are detected, so that a welder is helped to check whether the welding result meets the requirements of a welding process, the defective welding positions can be corrected in time, and the welding quality is guaranteed.
Drawings
Fig. 1 is a schematic diagram of a welding process corresponding to step S4 of the present invention.
Fig. 2 is a schematic structural diagram of the welded marine vertical ladder of the present invention.
Fig. 3 is a partial structural schematic view of the marine vertical ladder of the present invention.
Description of reference numerals:
1. a ladder frame; 11. a first outer side; 12. a first inner side; 13. a second inner side; 14. a second outer side; 2. a first square steel step; 3. a second square steel step; 4. a third-party steel step; 5. a fourth steel step; 6. a fifth square steel step; 7. a sixth steel step; 8. a rack; 9. and (7) welding seams.
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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "top", "bottom", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
As shown in fig. 1 to 3, a welding method for a marine vertical ladder according to an embodiment of the present invention includes the following steps:
s1, providing two ladder frames 1 and a plurality of square steel steps, and uniformly inserting the square steel steps into the two ladder frames 1 at equal intervals;
s2, fixing the ladder frame 1 according to the side standing position;
s3, performing pre-welding treatment on the ladder frame 1 and the square steel step to be welded;
s4, welding the joints of the second inner side surface 13 of the ladder frame 1 to be welded and the plurality of square steel steps and the joints of the first outer side surface 11 of the ladder frame 1 and the plurality of square steel steps in a staggered welding mode;
s5, overturning the ladder frame 1 to be welded and the plurality of square steel steps for 180 degrees through an overturning mechanism, and welding the joints of the first inner side surface 12 of the ladder frame 1 to be welded and the plurality of square steel steps and the joints of the second outer side surface 14 of the ladder frame 1 and the plurality of square steel steps in a staggered welding mode;
and S6, detecting the welded ladder frame 1 and the plurality of square steel steps.
Based on the arrangement, according to the welding method of the marine straight ladder, the square steel steps are obliquely arranged on the ladder frame 1, the ladder frame 1 is fixed according to the side standing position, the marine straight ladder to be welded is fixed according to the standing position, and when a welder welds the square steel steps and the ladder frame 1, the welding mode is flat welding, so that the whole welding process can be better controlled, the welding efficiency is higher, the welding difficulty is greatly reduced, the welding level requirement on the welder is reduced, and the condition that a welding pool is accumulated is avoided; the method has the advantages that the ladder frame 1 and the square steel steps to be welded are subjected to pre-welding treatment, so that oxide films and oil stains on the surfaces of the square steel steps and the ladder frame 1 can be removed, and air holes and slag inclusion on the surfaces of the square steel steps and the ladder frame 1 are prevented; by adopting the staggered welding mode at the joint of the second inner side surface 13 of the ladder frame 1 to be welded and the plurality of square steel steps and the joint of the first outer side surface 11 of the ladder frame 1 and the plurality of square steel steps, when different square steel steps are welded with the ladder frame 1, the square steel steps positioned in the middle are welded with the ladder frame 1 at first, and then different square steel steps are welded with the ladder frame 1 from two sides in sequence in a staggered mode, so that the irregular deformation at the welding position of the square steel steps and the ladder frame 1 can be reduced, the rigidity and the strength of the square steel steps and the ladder frame 1 are improved, the polishing workload after welding is reduced, and the appearance attractiveness of the welded square steel steps and the ladder frame 1 is improved; through detecting the welded connection position of the ladder frame 1 and the plurality of square steel steps after the welding is finished, a welder is helped to check whether the welding result meets the requirements of the welding process, so that the defective welding position can be corrected in time, and the welding quality is ensured.
In this embodiment, as shown in fig. 1 to 3, in order to reduce the welding height and the polishing amount after the welding is completed, in step S1, one end of each square steel step passes through the first outer side surface 11 of the ladder rack 1 and is 114mm away from the first outer side surface of the ladder rack 1, and the other end of each square steel step passes through the second outer side surface 14 of the ladder rack 1 and is 144mm away from the second outer side surface of the ladder rack 1.
In this embodiment, as shown in fig. 1 to 3, in order to enable the ladder rack 1 to be fastened and placed on the side wall and ensure the stability of the welding process, in step S2, the ladder rack 1 is fixed on the side wall through the rack 8. Specifically, the upper part, the middle part and the bottom part of one ladder frame 1 are respectively connected with one rack 8, of course, the ladder frame 1 can also be connected with a plurality of racks 8, the embodiment of the invention is not limited, and a user can select the racks according to the requirement.
In this embodiment, as shown in fig. 1 to 3, in order to ensure the welding quality, in step S3, the pre-welding treatment includes detecting an assembly gap between the ladder rack 1 and the square steel step, and cleaning a groove at a joint between the ladder rack 1 and the square steel step. Specifically, the gap between the ladder frame 1 and the square steel step cannot be too large or too small, when the gap between the ladder frame 1 and the square steel step is too large, the welding difficulty is increased, the filling amount is large, the welding progress is influenced, and when the gap between the ladder frame 1 and the square steel step is too small, the welding difficulty is caused; when welding ladder frame 1 and square steel step, because ladder frame 1 and square steel step are as a whole after the welding, the cleanliness of groove is if not high, then can make ladder frame 1 and square steel step can not freely lengthen or shorten to produce stress and deformation.
In this embodiment, as shown in fig. 1 to 3, in order to improve the welding efficiency and save the welding cost, in steps S4 and S5, CO is used between the ladder rack 1 and the plurality of square steel steps2The welding method of gas shielded welding is used for welding.
In this embodiment, as shown in fig. 1 to 3, the welding process of the marine vertical ladder is as follows: the marine vertical ladder of the embodiment of the invention comprises a ladder frame 1, a first square steel step 2, a second square steel step 3, a third square steel step 4, a fourth square steel step 5, a fifth square steel step 6 and a sixth square steel step 7, wherein the specific implementation steps of the step S4 are as follows: firstly, welding the joint of the third-party steel step 4 and the second inner side surface 13 of the ladder frame 1 to form a welding seam 9, welding the joint of the third-party steel step 4 and the first outer side surface 11 of the ladder frame 1 to form a welding seam 9, then welding the joint of the fifth-party steel step 6 and the second inner side surface 13 of the ladder frame 1 to form a welding seam 9, welding the joint of the fifth-party steel step 6 and the first outer side surface 11 of the ladder frame 1 to form a welding seam 9, then welding the joint of the second-party steel step 3 and the second inner side surface 13 of the ladder frame 1 to form a welding seam 9, welding the joint of the second-party steel step 3 and the first outer side surface 11 of the ladder frame 1 to form a welding seam 9, then welding the joint of the fourth-party steel step 5 and the second inner side surface 13 of the ladder frame 1 to form a welding seam 9, and welding the joint of the fourth-party steel step 5 and the first outer side surface 11 of the ladder frame 1 to form a welding seam 9, then welding the joint of the first square steel step 2 and the second inner side surface 13 of the ladder frame 1 to form a welding seam 9, welding the joint of the first square steel step 2 and the first outer side surface 11 of the ladder frame 1 to form the welding seam 9, finally welding the joint of the sixth steel step 7 and the second inner side surface 13 of the ladder frame 1 to form the welding seam 9, and welding the joint of the sixth steel step 7 and the first outer side surface 11 of the ladder frame 1 to form the welding seam 9;
the specific implementation steps of step S5 are: the ladder frame 1 to be welded and a plurality of square steel steps are turned over for 180 degrees through a turning mechanism, a welder can turn over a straight ladder for 180 degrees manually or through a turning device, the joint of the third square steel step 4 and the first inner side 12 of the ladder frame 1 is firstly welded to form a welding seam 9, the joint of the third square steel step 4 and the second outer side 14 of the ladder frame 1 is welded to form the welding seam 9, then the joint of the fifth square steel step 6 and the first inner side 12 of the ladder frame 1 is welded to form the welding seam 9, the joint of the fifth square steel step 6 and the second outer side 14 of the ladder frame 1 is welded to form the welding seam 9, then the joint of the second square steel step 3 and the first inner side 12 of the ladder frame 1 is welded to form the welding seam 9, and the joint of the second square steel step 3 and the second outer side 14 of the ladder frame 1 is welded to form the welding seam 9, then welding the joint of the fourth steel step 5 and the first inner side surface 12 of the ladder frame 1 to form a welding seam 9, welding the joint of the fourth steel step 5 and the second outer side surface 14 of the ladder frame 1 to form a welding seam 9, then welding the joint of the first steel step 2 and the first inner side surface 12 of the ladder frame 1 to form a welding seam 9, welding the joint of the first steel step 2 and the second outer side surface 14 of the ladder frame 1 to form a welding seam 9, finally welding the joint of the sixth steel step 7 and the first inner side surface 12 of the ladder frame 1 to form a welding seam 9, and welding the joint of the sixth steel step 7 and the second outer side surface 14 of the ladder frame 1 to form a welding seam 9; the welding mode is staggered welding, plastic deformation of each square steel step and the ladder frame 1 caused by heating can be reduced, deformation of the welding joint between each square steel step and the ladder frame 1 can be properly reduced or mutually offset, and the purpose of reducing overall deformation is achieved.
In the embodiment, as shown in fig. 1 to 3, in order to further improve the welding effect, welding wires with corresponding diameters are adopted for welding the ladder frame 1 and the square steel steps with different thicknesses, the welding wires are too thin, and the welding parts are not melted yet and the welding wires are melted and dropped during welding, so that poor welding is caused; the welding wire is too thick, so that a weldment is melted and the welding wire is not melted, the heating time of a welding joint area of the ladder frame 1 and the square steel step is prolonged, the metallographic structure is changed, the welding quality is reduced, and when the thickness of the ladder frame 1 to be welded is 8-10 mm, the thickness is 0, CO is added2The diameter of a welding wire adopted by gas shielded welding is 1.2mm, the welding current intensity is 180-230A, the welding voltage intensity is 24-26V, and the welding gas flow is 18-20L/min.
In this embodiment, as shown in fig. 1 to 3, in order to ensure that the quality of the welded joint between the ladder frame 1 and the square steel step obtains sufficient stability, in step S5, the ladder frame 1 and the plurality of square steel steps after welding are subjected to nondestructive testing. Specifically, the weld joint 9 may be subjected to nondestructive testing by ultrasonic flaw detection, radiographic flaw detection, magnetic particle flaw detection, or penetrant flaw detection, but the embodiment of the present invention is not limited thereto, and a welder may select the weld joint according to needs.
In summary, according to the welding method of the marine straight ladder provided by the invention, the square steel steps are obliquely arranged on the ladder frame 1, the ladder frame 1 is fixed according to the side standing position, and the marine straight ladder to be welded is fixed according to the standing position, so that when a welder welds the square steel steps and the ladder frame 1, the welding mode is flat welding, the whole welding process can be better controlled, the welding efficiency is higher, the welding difficulty is greatly reduced, the welding level requirement on the welder is reduced, and the condition that a welding pool is accumulated is avoided; the method has the advantages that the ladder frame 1 and the square steel steps to be welded are subjected to pre-welding treatment, so that oxide films and oil stains on the surfaces of the square steel steps and the ladder frame 1 can be removed, and air holes and slag inclusion on the surfaces of the square steel steps and the ladder frame 1 are prevented; by adopting the staggered welding mode at the joint of the second inner side surface 13 of the ladder frame 1 to be welded and the plurality of square steel steps and the joint of the first outer side surface 11 of the ladder frame 1 and the plurality of square steel steps, when different square steel steps are welded with the ladder frame 1, the square steel steps positioned in the middle are welded with the ladder frame 1 at first, and then different square steel steps are welded with the ladder frame 1 from two sides in sequence in a staggered mode, so that the irregular deformation at the welding position of the square steel steps and the ladder frame 1 can be reduced, the rigidity and the strength of the square steel steps and the ladder frame 1 are improved, the polishing workload after welding is reduced, and the appearance attractiveness of the welded square steel steps and the ladder frame 1 is improved; through detecting the welded connection position of the ladder frame 1 and the plurality of square steel steps after the welding is finished, a welder is helped to check whether the welding result meets the requirements of the welding process, so that the defective welding position can be corrected in time, and the welding quality is ensured.
It should be understood that the terms "first", "second", etc. are used herein to describe various information, but the information should not be limited to these terms, which are only used to distinguish one type of information from another. For example, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information, without departing from the scope of the present invention.
The foregoing is directed to the preferred embodiment of the present invention, and it is understood that various changes and modifications may be made by one skilled in the art without departing from the spirit of the invention, and it is intended that such changes and modifications be considered as within the scope of the invention.
Claims (6)
1. A welding method of a marine vertical ladder is characterized by comprising the following steps:
s1, providing two ladder frames and a plurality of square steel steps, uniformly inserting the square steel steps into the two ladder frames at equal intervals, wherein one end of each square steel step penetrates through the first outer side face of each ladder frame and is 4mm away from the first outer side face of each ladder frame, and the other end of each square steel step penetrates through the second outer side face of each ladder frame and is 4mm away from the second outer side face of each ladder frame;
s2, fixing the ladder frame according to the side standing position;
s3, performing pre-welding treatment on the ladder frame and the square steel step to be welded;
s4, welding the joints of the second inner side surface of the ladder frame to be welded and the plurality of square steel steps and the joints of the first outer side surface of the ladder frame and the plurality of square steel steps in a staggered welding mode;
s5, turning the ladder frame to be welded and the square steel steps for 180 degrees through a turning mechanism, and welding joints of a first inner side surface of the ladder frame to be welded and the square steel steps and joints of a second outer side surface of the ladder frame to be welded and the square steel steps in a staggered welding mode;
and S6, detecting the welded ladder frame and the plurality of square steel steps.
2. The welding method for marine vertical ladders according to claim 1, wherein in the step S2, the ladder frame is fixed to the side wall by a rack.
3. The welding method of a marine vertical ladder according to claim 1, wherein the pre-welding treatment in step S3 includes detecting an assembly gap between the ladder frame and the square steel step, and cleaning a groove at a joint of the ladder frame and the square steel step.
4. The welding method for marine vertical ladder as set forth in claim 1, wherein CO is used between said ladder frame and a plurality of said square steel steps in said steps S4 and S52The welding method of gas shielded welding is used for welding.
5. A welding method for a marine vertical ladder as claimed in claim 4, wherein the CO is added when the thickness of the ladder frame to be welded is 8-10 mm2The diameter of a welding wire adopted by gas shielded welding is 1.2mm, the welding current intensity is 180-230A, the welding voltage intensity is 24-26V, and the welding gas flow is 18-20L/min.
6. The welding method for a marine vertical ladder as set forth in claim 1, wherein in the step S5, the welded ladder frame and the plurality of square steel steps are subjected to a non-destructive inspection.
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| CN201810382527.3A CN108637510B (en) | 2018-04-26 | 2018-04-26 | Welding method of marine vertical ladder |
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| CN109048179A (en) * | 2018-11-01 | 2018-12-21 | 东台市飞凌电气设备有限公司 | Trapezoidal bridge frame weld fixture apparatus |
| CN111571050A (en) * | 2020-04-30 | 2020-08-25 | 启东汇斯隆机械有限公司 | Welding method of marine vertical ladder |
| CN114101988B (en) * | 2021-12-27 | 2023-07-21 | 深圳亚士德科技有限公司 | Welding device for metal structural part |
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| JPH07267183A (en) * | 1994-03-30 | 1995-10-17 | Shinkurushima Dock:Kk | Device and method for automatically manufacturing intersection type structure, intersection type structure by the automatic manufacture, method of using the structure by the automatic manufacture, and device and method for automatically manufacturing steel ladder for ship |
| JPH07284936A (en) * | 1994-04-19 | 1995-10-31 | Shinkurushima Dock:Kk | Plural member binding device and automatic welding system for the device |
| CN101423107B (en) * | 2007-11-01 | 2011-01-26 | 江南造船(集团)有限责任公司 | Assembling and welding technique of ship water-jet propulsion flow-passage grid |
| KR100966924B1 (en) * | 2010-03-05 | 2010-06-30 | 주식회사 이래에이치아이 | Manufacturing method for ladder |
| JP5237355B2 (en) * | 2010-11-26 | 2013-07-17 | 三菱重工業株式会社 | Method for manufacturing panel structure |
| CN102275033A (en) * | 2011-05-12 | 2011-12-14 | 安徽伟宏钢结构有限公司 | Method of butt welding of steel plates to form deformation-resistant cross column |
| KR20130003539U (en) * | 2011-12-06 | 2013-06-14 | 대우조선해양 주식회사 | Jig for manufacturing vertical ladder in submarine |
| CN205400562U (en) * | 2016-03-04 | 2016-07-27 | 江苏扬子鑫福造船有限公司 | Ten thousand casees ship vertical ladders |
| CN205819490U (en) * | 2016-06-02 | 2016-12-21 | 章红忠 | A kind of ladder peculiar to vessel |
| CN106270929B (en) * | 2016-09-30 | 2019-04-16 | 中车青岛四方机车车辆股份有限公司 | The welding method of railway vehicle component |
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