Weather-proof gas protection welding wire for coating-free weather-proof steel bridge

Abstract

The invention provides a weather-proof gas protection welding wire for a coating-free weather-proof steel bridge, and belongs to the field of welding materials. According to the technical scheme, in the weather-proof gas protection welding wire for the coating-free weather-proof steel bridge, chemical components comprise the basic component Fe, and the welding wire is further prepared from, by mass percent, 0.03%-0.10% of C, 0.30%-0.50% of Si, 1.20%-1.60% of Mn, not larger than 0.012% of P, not larger than 0.005% of S, 0.30%-0.60% of Cr, 0.20%-0.50% of Ni, 0.20%-0.50% of Cu, 0.005%-0.025% of Ca and 0.005%-0.05% of Re. The welding wire is used for welding of weather-proof bridge steel, the strength of extension of deposited metal is high, the yield strength is high, the elongation is larger than or equal to 24%, and the low temperature impact resisting performance and the atmosphere corrosion resisting performance are excellent; and the welding wire is easy to manufacture and suitable for being popularized on a large scale.

Description

technical field [0001] The invention belongs to the field of welding materials, and in particular relates to a weather-resistant gas-shielded welding wire for a coating-free weather-resistant steel bridge, especially suitable for gas-shielded welding of weather-resistant steel plates with a yield strength of 345-460 MPa. Background technique [0002] Under the strategic background of my country's steady promotion of "One Belt, One Road" and "regional coordinated development", new design, construction, product and application technologies related to bridge safety and durability have attracted much attention. The coating-free weather-resistant steel bridge uses its own stabilized and dense rust layer as surface protection. Compared with ordinary coated steel bridges, it has technical and economic advantages such as easy maintenance, environmental protection, short construction period, and low overall cost. It is the first choice for high-performance bridges. An important devel...

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Problems solved by technology

[0008] In order to solve the technical problem that the existing gas-shielded welding wire has poor weather resistance and cannot meet the welding requirements of weather-resistant bridge steel, the invention provides a weather-resistant gas-shielded welding wire for coating-free weather-resistant steel bridges, which realizes The welding wire has a good match with the high-performance weather-resistant steel base material, the tensile strength of the deposited metal is greater than 500MPa, the low-temperature toughness is excellent, and the impact energy at -40°C is KV 2 It is greater than 100J, and the weather resistance index I is greater than 6.5, which greatly improves its weather resistance

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