Flux-cored welding wire for high-current vertical upward welding and its preparation method and application

Abstract

The invention belongs to the technical field of welding materials, and particularly relates to a flux cored wire for large-current vertical-up welding. The flux cored wire for large-current vertical-up welding comprises a skin and a flux core filled in the skin, wherein the flux core accounts for 14.0-14.5% of the mass percent of the flux-cored wire and comprises the following the components according to the mass percent of the flux-cored wire: 5.0-5.8% of TiO2, 1.4-1.9% of smelting agent, 0.4-0.5% of Si, 1.6-2.0% of Mn, 0.42-0.65% of Mg-Al alloy, 0.14-0.21% of Ti, 0.056-0.08% of B and the balance being Fe. The invention also provides a preparation method of the flux-cored wire. The preparation method comprises the following steps of: sealing the flux core in the skin by a steel belt method through O-shaped abutting joint, molding and reducing the diameter to obtain the flux-cored wire. The flux-cored wire is used for vertical-up welding, and the welding current is 270A-290A. The vertical-up welding current of the flux-cored wire provided by the invention can be as high as 270-290A, and the crown of a welded joint is less than 2.4mm; when the welding current is lower than 270-290A,the good formation of welded joints can be achieved; the ductility of the deposited metal of the flux-cored wire is higher than 26%; and the flux-cored wire has excellent plasticity and can improve the crack resistance of weld metal.

Description

technical field [0001] The invention belongs to the technical field of welding materials for metal welding, and in particular relates to a gas-shielded high-current vertical upward welding flux-cored welding wire and a preparation method and application thereof. Background technique [0002] Flux-cored wire is a high-efficiency welding material, which has many advantages such as high welding efficiency, shortened welding cycle, good welding process performance, beautiful weld shape, easy adjustment of composition, and small welding deformation. Therefore, it is used in the welding of steel structures such as ships and bridges. be widely used. But when the ordinary E501-1 flux-cored wire is welded vertically, when the welding current is higher than 240A, the weld can hardly be formed; and when the welding current is lower than 240A, although the weld is beautiful, the welding efficiency is low. Therefore, in order to improve work efficiency and reduce the increased workload ...

AI Technical Summary

Problems solved by technology

But when the ordinary E501-1 flux-cored wire is welded vertically, when the welding current is higher than 240A, the weld can hardly be formed; and when the welding current is lower than 240A, although the weld is beautiful, the welding efficiency is low

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