Flux-cored welding wire for overlaying welding and application thereof

A technology of flux-cored welding wire and welding wire, which is applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc. It can solve the problems of unacceptable by users, poor compatibility of wear-resistant band, poor wear-resistant performance, etc., and achieve welding Good manufacturability, reduced rotation resistance, and excellent wear resistance
CN101537548AInactive Publication Date: 2009-09-23高智海
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
高智海
Publication Date
2009-09-23
Estimated Expiration
Not applicable · inactive patent
Patent Text Reader

Abstract

Aiming at the disadvantages and market demands of the prior art, the invention discloses a flux-cored welding wire for overlaying welding, which consists of a low-carbon steel strip and a flux core; the weight percentage composition of the flux core comprises: 1 to 3 percent of Mo, 2 to 6 percent of B, 1 to 4 percent of Si, 1 to 4 percent of Mn, 0.5 to 4 percent of C, 3 to 7 percent of Nb, 10 to 40 percent of Cr, 1 to 4 percent of Re and the balance of Fe. The filling amount of the flux core is 30 percent of the total weight of the flux-cored welding wire. The flux-cored welding wire for overlaying welding can be used for the overlaying welding of a wearproof belt of a drill rod of an oil field. Compared with the prior art, the flux-cored welding wire has excellent welding manufacturability, small splashing, good compatibility and good repeated overlaying weldability; and as the wearing resistance and antifriction performance of the wearproof belt of the welded drill rod are improved, the hardness of the wearproof belt reaches HRC 59-61.
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Description

technical field

[0001] The invention relates to a flux-cored welding wire for surfacing welding and its application, in particular to a flux-cored welding wire used for surfacing welding of drill pipes in oil fields. Background technique

[0002] During the drilling process, the wear of the drill string and casing has always been a problem that affects the production and development of the oilfield. The wear of the drill string can reduce the service life of the drill string, and seriously cause the failure of the drill string, resulting in serious economic losses and waste of resources; Pipe wear will reduce the anti-collapse and internal pressure strength of the casing string in the slightest, affecting the quality and safety of subsequent drilling, completion, and production operations; scrapped. Therefore, the existing technology uses oilfield drill pipe hardbanding technology to protect the drill string and casing string, but the drill pipe hardbanding used in the mark...

Claims

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