Metal flux-cored wire containing Ti and B for carbon dioxide gas shielded welding

Abstract

The invention discloses a metal flux-cored wire containing Ti and B for carbon dioxide gas shielded welding. The metal flux-cored wire is suitable for backing welding of thick plates and high-speed flat fillet welding of high film thickness primer steel plates. According to the metal flux-cored wire, the weight of metal cored powder accounts for 10-30% of the total weight of the flux-cored wire, wherein a steel tape sheath comprises, by total weight percentage, 0.001-0.025% of C, 0.001-0.030% of Si, 0.01-0.35% of Mn, 0.001-0.030% of Al, 0.001-0.020% of P, 0.001-0.020% of S and the balance Fe; the metal cored powder comprises, by total weight percentage, 0.1-5.0% of fluoride, 0.01-0.5% of C, 8-20% of Mn, 2-8% of Si, 0.1-5.0% of Ti, 0.01-0.1% of B, 0.01-2.0% of Zr and the balance Fe. The metal flux-cored wire is less in splashing quantity and can achieve crack resistance the same as that of a solid welding wire when backing welding is carried out on the thick plates, excellent gas porosity resistance can be achieved when high-speed flat fillet welding is conducted on the primer steel plates coated with high film thicknesses of 30-40 microns, and deposited metal has good mechanical properties.

Description

technical field [0001] The invention relates to a welding wire for gas-shielded welding, in particular to a flux-cored welding wire containing Ti and B-type metal for carbon dioxide gas-shielded welding. field of welding materials. Background technique [0002] In the thick plate backing welding process of steel structure, the earliest solid wire welding is mainly used to improve the crack resistance of the bottom pass weld. However, when solid welding wire is used in carbon dioxide gas shielded welding, it is easy to cause a lot of spatter under relatively high welding conditions, which will cause troubles for subsequent processing, and the stress concentration of the plate may be caused by spatter, which will increase the sensitivity of pitting corrosion. high. In the field of ship welding, most shipyards currently use primer-resistant flux-cored wire for trolley-type automatic welding. This welding material can be welded under the condition of a low film thickness of le...

AI Technical Summary

Problems solved by technology

However, when solid welding wire is used in carbon dioxide gas shielded welding, it is easy to cause a lot of spatter under relatively high welding conditions, which will cause troubles for subsequent processing, and the stress concentration of the plate may be caused by spatter, which will increase the sensitivity of pitting corrosion. high

In the field of ship welding, most shipyards currently use primer-resistant flux-cored wire for trolley-type automatic welding. This welding material can be welded under the condition of a low film thickness of less than 25 μm to obtain an ideal porosity resistance. However, under the condition of high film thickness greater than 30μm, its paint resistance is not ideal

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