Modified hardfacing self-shielded flux-cored wire doped with multi-boride and preparation method of modified hardfacing self-shielded flex-cored wire doped with multi-boride

Abstract

The invention discloses a modified hardfacing self-shielded flux-cored wire doped with multi-boride and a preparation method of the modified hardfacing self-shielded flex-cored wire doped with the multi-boride. The modified hardfacing self-shielded flux-cored wire doped with the multi-boride comprises a low-carbon steel strip and a flux core, wherein the flux core comprises, by mass percentage, 45-55 wt% of high carbon ferro-chrome, 6-16 wt% of B4C, 3-9 wt% of TiB2, 3-9 wt% of ZrB2, 1-3 wt% of graphite, 0.5-1 wt% of cellulose powder with the mesh being 60, 0.5-1 wt% of cellulose powder with the mesh being 200, 1-3 wt% of an aluminum-magnesium alloy with the mesh being 60, 0.5-2 wt% of an aluminum-magnesium alloy with the mesh being 200, 2-7 wt% of an silicon-manganese alloy with the mesh being 60, 1-4 wt% of an silicon-manganese alloy with the mesh being 200 and the balance iron powder, and the flux core accounts for 50-54 wt% of the total mass of the flux-cored wire. According to the flux-cored wire, through addition of the flux core components of different grain sizes, the good welding process performance is guaranteed; through the addition of the multi-boride component, the multi-boride is dispersed and extracted in the welding process; and the flux-cored wire has the beneficial effects of being high and uniform in hardness, good in wear resistance and the like, and few residues are left on the surface of a weld bead, and slag removal is not needed in multi-layer welding.

Description

technical field [0001] The invention belongs to the field of welding in material processing engineering, and in particular relates to a multi-component boride-doped modified wear-resistant surfacing self-protecting flux-cored welding wire and a preparation method thereof. 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 tend to have higher hardness, which can theoretically provide better wear resistance, such as B...

AI Technical Summary

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 , very prone to cracks, greatly limiting its wear resistance

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