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Processing method of low temperature resistance steel plate welding

A welding process and low-temperature-resistant technology, which is applied in welding equipment, manufacturing tools, arc welding equipment, etc., can solve problems such as the decline in the mechanical properties of welded joint grains, achieve the effect of improving welding construction efficiency and avoiding welding cracks

Active Publication Date: 2008-07-09
DALIAN SHIPBUILDING IND
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  • Abstract
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Problems solved by technology

[0003] The present invention solves the technical problem of low temperature resistance of low temperature steel welded joint materials, and provides a low temperature resistant steel plate welding process
In order to control the degradation of mechanical properties caused by the coarse grain of the welded joint, it is stipulated that the welding line energy should not be too large during the welding process, and the welding line energy should not exceed 2.5KJ / mm

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  • Processing method of low temperature resistance steel plate welding
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  • Processing method of low temperature resistance steel plate welding

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specific Embodiment

[0007] Specific embodiment: a low-temperature-resistant steel plate welding process method used in the BINGO 9000 semi-submersible platform for exploration of deep-sea oil / natural gas resources according to the present invention. For the content of welding methods and welding materials for different steel materials and parts of the BINGO 9000 semi-submersible platform, see The following table:

[0008]

[0009] Note: The calculation method of combined thickness (Tcomb), Tcomb=T1+T2+T3+T4, where T1, T2, T3, T4 are shown in the attached figure.

[0010] The welding between NVF36 and NVF36 / Z steel is made of covered electrode arc welding (SMAW), and the filling and covering are made of flux-cored welding wire CO 2 For gas shielded welding (FCAW), the welding line energy shall not exceed 2.5KJ / mm. In this way, combined with the structural characteristics of the product and the steel, the appropriate welding method is selected, and the high-efficiency welding method is adopted ...

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Abstract

The present invention relates to a low temperature resistant steel sheet welding process. Said process is characterized by that between NVF36 and NVF36 / Z steel materials its backing weld adopts covered electrode are welding, its filling and cosmetic weld adopts flux-cored wire CO2 gas protective welding; the welding material for covered electrode are welding is AWS A5.1E7018-1, and the welding material for flux-cored wire CO2 gas protective welding is AWS A5.20E71T-1; the welding wire energy must be less than 2.5KJ / mm. and before welding the optimum lowest preheating temperature for welding NVF 36 and NVF36 / Z is 50deg.C.

Description

Technical field: [0001] The low-temperature-resistant steel plate welding process is a welding process for connecting low-temperature-resistant high-strength steel used in semi-submersible platforms. Background technique: [0002] The semi-submersible platform used for exploration of deep sea oil / gas resources is designed to serve in the North Sea of ​​Norway. Affected by low temperature and waves, the working environment is extremely harsh, and the requirements for technology and safety are extremely high. In its important and special structures, a large number of low-temperature resistant high-strength steels are used, such as EH36 and FH36. Among them, FH36 (NVF36, NVF36 / Z, etc.) steel requires an impact test temperature of -60°C and a plate thickness of 60mm. There was no welding process for this steel before. Invention content: [0003] The present invention solves the technical problem of low temperature resistance of low temperature steel welded joint materials, an...

Claims

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Application Information

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IPC IPC(8): B23K9/025B23K9/16
Inventor 陈绍全于立新李生鹏王益多曾宪文
Owner DALIAN SHIPBUILDING IND