A weather-resistant submerged arc welding wire for coating-free weather-resistant steel bridges

Abstract

The invention discloses a weather-resistant submerged arc welding wire for a free-coating weather-resistant steel bridge, and belongs to the field of welding materials. According to the technical scheme, the weather-resistant submerged arc welding wire for the free-coating weather-resistant steel bridge comprises a basic chemical component Fe and the following chemical components in percentage by mass: 0.03 to 0.10% of C, 0.10 to 0.28% of Si, 1.15 to 1.55% of Mn, not greater than 0.012% of P, not greater than 0.005% of S, 0.25 to 0.55% of Cr, 0.25 to 0.55% of Ni, 0.20 to 0.50% of Cu, 0.005 to 0.025% of Ca, and 0.005 to 0.05% of Re. The welding wire is applied to the welding of Q345qENH-Q460qENH serial weather-resistant bridge steel, and is outstanding in atmospheric corrosion resistance, high in process performance, stable in quality, and suitable for large-scale popularization and application.

Description

technical field [0001] The invention belongs to the field of welding materials, and in particular relates to a weather-resistant submerged arc welding wire for a coating-free weather-resistant steel bridge, which is suitable for welding weather-resistant steel plates and steel pipes, and is especially suitable for welding Q345qENH to Q460qENH series of coating-free weather-resistant bridge steels. Background technique [0002] With the improvement of bridge safety performance, service performance, economic performance, environmental protection performance and durability, weather-resistant steel bridges have become an important development direction of high-performance bridges. Cu, P, Cr, Ni and other elements in weathering steel form a dense surface protective layer in the alternating dry and wet environment, which can prevent the in-depth development of corrosion. Weathering wire is one of the supporting materials that are mandatory for the welding and manufacturing of weath...

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Problems solved by technology

[0004] In order to solve the technical problem of poor weather resistance of the existing submerged arc welding wire, the invention provides a weather-resistant submerged arc welding wire for a weather-resistant steel bridge without coating, by adding Cr, Ni and Cu elements to the welding wire, and simultaneously adding an appropriate proportion of Ca The technical scheme of rare earth and other elements makes the prepared welding wire have stable arc combustion, uniform droplet transfer, beautiful weld bead, good process performance, excellent atmospheric corrosion resistance, and effective improvement in metallurgical quality and comprehensive mechanical properties of the weld during the welding process. , suitable for the design and welding manufacture of paint-free weather-resistant bridge steel structures

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