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Welding method for steel Q390GJC for building structure

A technology of steel for building structures and welding methods, applied in welding equipment, welding/welding/cutting items, arc welding equipment, etc., can solve problems such as cracks, unformed welding methods and processes, and increased welding difficulty

Active Publication Date: 2017-02-01
鞍钢钢结构(营口)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the Ni content is high, and Ni is easy to form low-melting eutectic with many elements, so it is easy to produce cracks, and the welding difficulty increases. So far, there is no welding method and process for forming

Method used

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  • Welding method for steel Q390GJC for building structure
  • Welding method for steel Q390GJC for building structure
  • Welding method for steel Q390GJC for building structure

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Embodiment Construction

[0031] The present invention will be described in detail below in conjunction with the accompanying drawings, but it should be pointed out that the implementation of the present invention is not limited to the following embodiments.

[0032] The chemical composition of building structural steel Q390GJC is shown in Table 1, and the mechanical properties are shown in Table 2.

[0033] Table 1 Chemical Composition of Q390GJC Building Structure Steel (%)

[0034]

[0035] Table 2 Mechanical properties of Q390GJC steel for building structures

[0036]

[0037] Welding method of steel Q390GJC for building structure:

[0038] 1 Welding joints adopt butt flat welding, butt horizontal welding, corner butt flat welding, T-shaped fillet horizontal welding, and T-shaped fillet non-penetration flat welding.

[0039] 2 The welding method adopts submerged arc automatic welding, CO 2 Gas shielded welding.

[0040] 3 Preheat to 60°C before welding.

[0041] 4. Multi-layer and multi-...

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Abstract

The invention relates to a welding method for steel Q390GJC for a building structure. A welding joint type adopts butt-joint flat welding, butt-joint transverse welding, angular butt-joint flat welding, T-shaped angle joint transverse welding, and T-shaped angle joint ship type non-penetration flat welding; submerged automatic arc welding and CO2 gas shielded welding are adopted; the steel Q390GJC is preheated before being welded, wherein the preheating temperature is 60 DEG C; multi-layer and multi-pass welding is adopted, and the interlayer temperature is 150 to 200 DEG C. The welding method has the advantages that: welding problems of the steel are solved aiming at the component ranges of the steel Q390GJC and technical conditions; the welding problems specifically comprise: (1) preheating the steel to a temperature before welding so as to avoid cold cracks at a joint part; (2) proposing reasonable groove types and welding methods according to joint types and plate thickness; (3) selecting proper welding materials aiming at joint types, groove types and welding methods; (4) proposing proper welding process parameters. The steel Q390GJC is welded by adopting the technical scheme; the welding joint can achieve the same mechanical property as that of a base material, and meets using requirements of a project.

Description

technical field [0001] The invention belongs to the technical field of steel welding for building structures, and in particular relates to a welding method for steel Q390GJC for building structures. Background technique [0002] The steel used in building structures has properties such as earthquake resistance and low temperature impact resistance, which improves its manufacturing reliability. The use of steel for building structure can make the building structure develop in the direction of high-rise and long-span. Such as high-rise buildings, long-span stadiums, airports and other large-scale construction projects. [0003] The main difference between Q390GJC and general carbon steel and low alloy steel is that the yield strength ratio and yield strength fluctuation range are specified, the carbon equivalent and welding crack sensitivity index are specified, and the P and S contents are reduced. However, the Ni content is high, and Ni is easy to form a low-melting eutect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16B23K9/18B23K9/095B23K103/04
CPCB23K9/095B23K9/16B23K9/18
Inventor 马丽袁旭东闫红霞谷飚胡金旭
Owner 鞍钢钢结构(营口)有限公司
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