Complex nitride and boride synergetic enhancement self-protection bead weld flux-cored wire

Abstract

The invention discloses a complex nitride and boride synergetic enhancement self-protection bead weld flux-cored wire. A mild-carbon steel strip is adopted as skin, a flux core is prepared from, by mass, 6%-45% of high carbon ferro-chrome, 3%-10% of TiN, 3%-10% of BN, 3%-10% of B4C, 3%-10% of TiB2, 3%-10% of ZrB2, 1%-3% of graphite, 0.5%-1% of 60-mesh cellulose powder, 0.5%-1% of 200-mesh cellulose powder, 1%-3% of 60-mesh aluminum magnesium alloy, 1%-3% of 200-mesh aluminum magnesium alloy, 2%-5% of 60-mesh silicomanganese, 2%-5% of 200-mesh silicomanganese and the balance iron powder, and flux core powder accounts for 50% to 54% of the total weight of the wire. According to the complex nitride and boride synergetic enhancement self-protection bead weld flux-cored wire, flux core components different in grain size are added, so that the good welding process performance is guaranteed; the flux core components and other alloy powder are reasonably matched, so that complex nitride and boride are dispersed through the wire in the welding process, the advantages of being high and even in hardness, good in wear resistance and the like are achieved, no slag basically exists on the surface of a weld bead, and slag removal is not needed during multilayer welding.

Description

technical field [0001] The invention belongs to the field of welding in material processing engineering, and in particular relates to a multi-element nitride and boride synergistically reinforced self-protecting flux-cored welding wire. Background technique [0002] At present, the wear-resistant surfacing flux-cored welding wire for surfacing repair generally relies on M 7 C 3 The main chromium carbide type carbides provide its hardness, M 7 C 3 The microhardness is 1200-1700HV. Researchers often further improve the hardness by adding strong carbide-forming elements Nb, Ti, etc. Generally speaking, relying on carbides to play an anti-wear skeleton role in the surfacing alloy structure to improve the wear resistance of the surfacing alloy is a common choice for current welding material manufacturers. [0003] Compared with carbides, borides and nitrides tend to have higher hardness, which can theoretically provide better wear resistance, such as B 4 C. BN is the second...

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Problems solved by technology

However, in the traditional welding process, the addition of B tends to increase the brittleness of the surfacing metal, mainly because during the solidification process of the high-temperature melt, B reacts with other elements to form dendritic borides, which have poor toughness , it is easy to produce cracks, which greatly limits its wear resistance; in addition, the addition of N is easy to cause nitrogen pores

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