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LNG ship liquid cargo tank invar pipe welding method

A technology of LNG ship and welding method, which is applied to ships and other directions, can solve the problems of increased workload, prolonged construction period, and inability to install insulating boxes normally, so as to avoid deformation, improve construction efficiency, and save time for correction work.

Pending Publication Date: 2022-01-11
HUDONG ZHONGHUA SHIPBUILDINGGROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] After the invar tube is welded, an insulation box needs to be installed, and in the process of welding the invar tube wing plate, the invar tube wing plate is easily deformed by heat, resulting in the failure to install the insulation box normally, so the welding deformation of the invar tube should not exceed 3mm ;Once welding deformation occurs, it takes a lot of time to correct it, which prolongs the construction period and increases the workload

Method used

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  • LNG ship liquid cargo tank invar pipe welding method
  • LNG ship liquid cargo tank invar pipe welding method
  • LNG ship liquid cargo tank invar pipe welding method

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Embodiment Construction

[0028] The technical solution of the present invention is further described below in conjunction with specific embodiments:

[0029] A method for welding invar pipes in liquid cargo tanks of LNG ships, the method comprising the following steps:

[0030] S1. Weld flat steel profiles on the side of the hull 1. The flat steel profiles include a first flat steel profile 21 and a second flat steel profile 22. The first flat steel profile 21 and the second flat steel profile 22 are vertically welded on one side of the hull. Side, the long sides of the first flat steel profile 21 and the second flat steel profile 22 are set perpendicular to the hull 1, such as figure 1 shown;

[0031] S2. An invar tube wing is provided on the side of the invar tube 8. The invar tube wing is divided into a first invar tube wing 71 and a second invar tube wing 72. The first invar tube wing 71 Set in parallel with the second invar tube wing 72, the length of the first invar tube wing 71 is greater tha...

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Abstract

The invention relates to an LNG ship liquid cargo tank invar pipe welding method. The method comprises the steps that S1, a first flat steel profile and a second flat steel profile are welded to the side face of a ship body; S2, a first invar pipe wing plate and a second invar pipe wing plate are arranged on the side face of an invar pipe, the first invar pipe wing plate and the second invar pipe wing plate are arranged in parallel, the length of the first invar pipe wing plate is larger than that of the second invar pipe wing plate, the end of the first invar pipe wing plate is in lap joint with the side face of the first flat steel profile, and an opening is formed between the second invar pipe wing plate and the second flat steel profile; S3, the first invar pipe wing plate abuts against one side of the lap joint position of the first invar pipe wing plate and the first flat steel profile; S4, the lap joint position of the first invar pipe wing plate and the first flat steel profile is welded; and S5, an insulation box is installed. In the welding process, the invar pipe wing plates are propped by means of the anti-deformation device, deformation of the invar pipe wing plate in the welding process is avoided, the time of follow-up correction work is saved, and the construction efficiency is improved.

Description

technical field [0001] The invention relates to the field of LNG ship construction, in particular to a welding method for invar pipes in liquid cargo tanks of LNG ships. Background technique [0002] The invar tube is mainly used in the transverse ring area of ​​the NO96 ship. The transverse ring is octagonal, so the welding of the invar tube faces the problem of multiple angles. On the steel hull, the invar tube flange needs to be welded to the hull with the help of stainless steel flat steel profiles, and the invar tube flange is welded and fixed to the flat steel structure on one side of the hull to realize the installation of the invar tube on the hull. [0003] After the invar tube is welded, an insulation box needs to be installed, and in the process of welding the invar tube wing plate, the invar tube wing plate is easily deformed by heat, resulting in the failure to install the insulation box normally, so the welding deformation of the invar tube should not exceed 3m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B63B73/43B63B73/20
CPCB63B73/43B63B73/20
Inventor 杨峰王德明祝圻封朱焊烽高思
Owner HUDONG ZHONGHUA SHIPBUILDINGGROUP