Electroslag welding solid wire for low-temperature steel plate

Abstract

The invention discloses an electroslag welding solid wire for a low-temperature steel plate. The solid wire comprises the chemical components in percentage by weight as follows: 0.04%-0.08% of C, 0.20%-0.60% of Si, 0.5%-1.5% of Mn, less than or equal to 0.02% of P, less than or equal to 0.015% of S, 0.20%-0.60% of Mo, 3.5%-5.5% of Ni, 0.10%-0.30% of Ti, 0.005%-0.02% of B, less than or equal to 0.005% of N, 0.005%-0.2% of Zr and the balance of Fe and inevitable impurities. The solid wire is used for welding the steel plate with the thickness of less than or equal to 80 mm; the minus 40 DEG C impact absorbing energy of a weld metal of a welded joint is larger than or equal to 180 J; the tensile strength of the welded joint is larger than or equal to 565 MPa; when the strength is guaranteed, the weld metal has excellent low-temperature toughness; and the solid wire can be widely applied to electroslag welding processing of steel plates in the fields such as ships, oceaneering, buildings and bridges in cold areas and the like.

Description

technical field [0001] The invention relates to a solid welding wire for electroslag welding used for low-temperature steel plates, in particular to a solid welding wire for electroslag welding which can ensure excellent low-temperature impact toughness of weld metal at -40°C, and belongs to the field of welding materials. Background technique [0002] Because it can significantly improve welding efficiency and save costs, high heat input welding technologies such as electroslag welding have been widely used in industries such as construction, bridges, and ships. However, due to the excessive welding heat input in the electroslag welding process, the cooling rate of the weld seam is too slow, the weld seam structure is coarsened, and the low temperature toughness of the weld metal is deteriorated. [0003] At present, Japan has related technologies related to electroslag welding wire, for example: JP8164497A discloses a kind of electroslag welding wire that can be used for e...

AI Technical Summary

Problems solved by technology

However, due to the excessive welding heat input in the electroslag welding process, the cooling rate of the weld seam is too slow, the weld seam structure is coarsened, and the low temperature toughness of the weld metal is deteriorated.

[0003] At present, Japan has related technologies related to electroslag welding wire, for example: JP8164497A discloses a kind of electroslag welding wire that can be used for electroslag welding with large heat input, but it is only limited to the welding of steel for rails of medium carbon Cr-Mo series; JP59179289A discloses a Cu-Cr-Ni solid core wire for electroslag welding with medium carbon, but the low-temperature toughness of the weld metal made by the two kinds of wires is insufficient

In order to improve the impact toughness of the weld metal, for example: JP2003340592A and JP2004058142A adopt the Mo+Ti+B technical route, and try to suppress the formation of pro-eutectoid ferrite during the cooling process of the weld metal by comprehensively adding Cr, V and Nb , Promote the nucleation of intragranular ferrite, so that the 0°C impact energy of the weld metal of the welded joint is ≥ 100J; JP2009154199A studies the influence of the balance between Ti, B and Al elements on the toughness of the electroslag weld metal, and develops A low-carbon non-copper-coated solid wire, the impact energy of the weld metal at 0 °C is ≥ 70J; and JP2009045671A is based on the Mo+Ti+B technology route, by adding strong deoxidizers Mg, Ca or REM, to To enhance the nucleation of intragranular ferrite, the 0°C impact energy of the weld metal of the 60mm steel plate welded by this welding wire is ≥100J. Impact properties at 0°C

[0004] In recent years, with the construction of large bridges, buildings and marine projects along the river and coastal areas, in order to improve welding efficiency, electroslag welding has also been gradually applied to the construction of these structures; these structures require steel plates and their welded joints to meet- 40°C impact performance requirements (i.e. -40°C impact absorption energy ≥ 47J), obviously the above welding wire cannot meet such requirements

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