Flux-cored wire for build up welding and preparation method of flux-cored wire

Abstract

The invention discloses a flux-cored wire for build up welding and a preparation method of the flux-cored wire. The flux-cored wire for build up welding comprises a low-carbon steel belt and a flux core. The filling content of the flux core accounts for 30% of the total weight of the flux-cored wire. Powder of the flux core comprises, by weight percent, 1%-3% of Zr, 2%-6% of B, 1%-4% of Si, 1%-4% of Mn, 0.5%-4% of C, 3%-7% of Nb, 10%-40% of Cr, 1%-4% of Re and the balance Fe. The flux-cored wire for build up welding is prepared through pelleting, powder preparing, powder mixing, low-carbon steel belt clearing, roll forming and wire drawing forming. The flux-cored wire is good in welding manufacturability, small in splashing and good in compatibility and repeated build up welding performance. The wear resistance and friction reduction performance of a drill rod wear-resisting belt obtained through build up welding of the flux-cored wire are improved, the hardness of the wear-resisting belt is HRC59-61, and the flux-cored wire can be used for build up welding of the drill rod wear-resisting belt in an oil field.

Description

technical field

[0001] The invention relates to the field of wear-resistant banding of oilfield drill pipes, in particular to a flux-cored welding wire used for surfacing welding of oilfield drill pipes with wear-resistant bands and a preparation method thereof. Background technique

[0002] During the drilling process, the wear of the drill string and casing always affects the production and development of oilfields. The wear of the drill string will reduce the service life of the drill string in the slightest, and cause the failure of the drill string in the worst case, resulting in serious economic losses and waste of resources; the wear of the casing will reduce the anti-collapse and internal pressure strength of the casing string in the slightest, affecting The quality and safety of the subsequent drilling, well completion and mining operations will cause deformation, leakage, collapse of the casing string, and sometimes cause the entire well to be scrapped. Therefore,...