Welding method for high-performance weather-resistant steel which is at Q345qENH-Q420qENH level and used for bridges

A welding method and technology for bridges, applied in the direction of welding medium, welding equipment, welding equipment, etc., can solve problems such as difficulty in meeting low temperature toughness indicators, and achieve the effects of strong practicability, promotion of upgrading, and good corrosion resistance

Inactive Publication Date: 2016-01-20
中铁宝桥(扬州)有限公司
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Problems solved by technology

At present, the low-temperature toughness index of existing welding materials at home and abroad is mostly -20°C ≥ 47J, and it is difficult to meet the low-temperature toughness index of -40°C ≥ 47J

Method used

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  • Welding method for high-performance weather-resistant steel which is at Q345qENH-Q420qENH level and used for bridges
  • Welding method for high-performance weather-resistant steel which is at Q345qENH-Q420qENH level and used for bridges
  • Welding method for high-performance weather-resistant steel which is at Q345qENH-Q420qENH level and used for bridges

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Embodiment Construction

[0060] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0061] The chemical composition of Q345qENH-Q420qENH high-performance weathering steel for bridges designed by the present invention is listed in Table 1, and the mechanical properties are beneficial to Table 2.

[0062] Table 1 Chemical Composition of Steel

[0063]

[0064]

[0065] Table 2 Mechanical properties of steel

[0066]

[0067] The present invention determines the preheating temperature before welding for different plate thicknesses B of Q345qENH-Q420qENH grade high-performance weathering steels for bridges. When the plate thickness B≤50mm, there is no preheating welding.

[0068] According to the special chemical composition of Q345qENH and Q420qENH high-performance weathering steels for bridges, the present invention considers that excessive welding heat input will cause burning loss of alloy elements, so as t...

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Abstract

The invention discloses a welding method for high-performance weather-resistant steel which is at the Q345qENH-Q420qENH level and used for bridges. Welding connectors selected according to specific chemical components, mechanical properties, welding connector corrosion-resistant indexes, applicable technological conditions and different plate thickness specifications of the high-performance weather-resistant steel which is at the Q345qENH-Q420qENH level and used for bridges are in the type of a butt joint and a T-shaped connector (including a corner connector); a welding method includes submerged automatic arc welding, solid wire argon-rich gas protection semi-automatic welding, flux-cored wire CO2 gas protection semi-automatic welding and shielded metal arc welding; and preheating temperature before welding is determined according to different plate thicknesses. The welding method comprehensively covers the connector types and the plate thickness specifications of the bridge steel structure; the technical scheme is high in practicability; the implementation effect totally meets the technological requirements of structural steel for existing bridges and relevant standards in the steel bridge manufacturing field; and the welding method can be used for welding the high-performance weather-resistant steel which is at the Q345qENH-Q420qENH level and has a great effect on prompting popularization of high-level weather-resistant bridge steel.

Description

technical field [0001] The invention relates to a welding process, in particular to a welding method for Q345qENH-Q420qENH high-performance weather-resistant steel for bridges, belonging to the technical field of iron and steel material welding. Background technique [0002] In recent years, with the rapid development of the national economy, the country has increased investment in infrastructure construction, and the bridge structure has gradually developed towards the direction of integration and long-span. Steel structure bridges have a series of advantages such as high strength, strong bearing capacity, can carry the largest load with the lightest weight, are convenient for factory processing, and have a short construction period. Reducing the life cycle cost of bridges has become the trend of bridge construction. However, the durability of ordinary steel bridges is more prominent, and they are usually protected by paint coatings. At present, the best coatings can only l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/18B23K9/16B23K9/095B23K9/23B23K9/235B23K35/24B23K35/38
CPCB23K9/18B23K9/095B23K9/164B23K9/23B23K9/235B23K35/24B23K35/383B23K2103/04
Inventor 吴江波张永利朱新华刘志刚车平杨虹李彦国张海涛
Owner 中铁宝桥(扬州)有限公司
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