High-tenacity less-splashing self-shielded coated flux-cored welding wire and preparation method thereof

Abstract

The invention discloses a high-tenacity less-splashing self-shielded coated flux-cored welding wire. The high-tenacity less-splashing self-shielded coated flux-cored welding wire comprises a welding wire matrix and a coating applied on the surface of the welding wire matrix, wherein the welding wire matrix consists of a low-carbon steel skin and a flux core arranged in the low-carbon steel skin by filling. The flux core comprises, by weight, 15-30% of rutile,1-2% of ferroniobium, 1-3% of aluminum powder, 1-2% of magnesium powder, 6-10% of fluoride, 0.5-1% of magnesite clinker, 0.5-0.9% of zircon sand and 52-70% of iron powder, wherein F / (Mg+Al)=0.015-0.05, the magnesium powder is converted into magnesium, Mg refers to a weight percentage of the magnesium accounting for the flux core raw materials, the aluminum powder is converted into aluminum, Al refers to a weight percentage of the aluminum accounting for the flux core raw materials, the fluoride is converted into fluorine, and F refers to a weight percentage of the fluorine accounting for the flux core raw materials. The invention further discloses a preparation method of the high-tenacity less-splashing self-shielded coated flux-cored welding wire. The high-tenacity less-splashing self-shielded coated flux-cored welding wire has the advantages that tensile strength can be above 840 MPa, elongation at break exceeds 20%, impact energy of weld joints is higher than 10 J at minus 30 DEG C, and less splashing during welding is achieved. The preparation method is simple and easily controllable, and production cost is saved.

Description

technical field [0001] The invention relates to the technical field of self-protecting flux-cored welding wire, in particular to a flux-cored welding wire with high toughness and less spattering self-protection coating and a preparation method thereof. Background technique [0002] Self-shielded flux-cored wire does not require any shielding gas and flux during the surfacing process. It is easy to operate, high in efficiency, low in dilution rate, and low in overall cost. It has become one of the more economical and convenient welding technologies at present. Promote gradually. [0003] However, the problems of high spatter rate, unstable arc and low impact toughness often occur in the welding process of self-preserving welding wire. There are two main sources of these shortcomings. On the one hand, although the self-shielding flux-cored wire is added to the flux core with a low boiling point gas-generating agent-fluoride, which is easy to form a steam pocket and can squeez...

AI Technical Summary

Problems solved by technology

At present, the surface treatment of flux-cored welding wire mainly includes cleaning and coating, but this is a weak link in most domestic flux-cored welding wire manufacturers, which directly or indirectly affects the quality of flux-cored welding wire to a large extent

In the traditional coating process, a layer of lubricating oil with adhesion is applied on the surface of the welding wire by chemical methods, and then the lubricating oil is used to absorb the adhesive additive. The whole process is complicated, and the coating is thick, uneven, and The disadvantage of low arc ionization efficiency, which leads to unstable arc during welding, resulting in stagnant melting and high spatter rate

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