Self protection pile-up welding flux core welding wire for shield cutter edge

Abstract

The present invention belongs to the field of material processing engineering, is especially self-protecting pile-up welding wire with flux core for shield cutter edge, and is applied mainly in the manufacture and repair of cutter edge of shield machine. The self-protecting pile-up welding wire has wrapping steel belt and flux core accounting for 20-35 wt wt%, and features the flux core comprising high carbon ferrochrome 15-35 wt%, metal chrome 15-35 wt%, ferromolybdenum 2-10 wt%, ferrovanadium 1-5 wt%, Si-Mn alloy 5-15 wt%, Al-Mg alloy 1-5 wt%, ferroboron 2-12 wt%, and Fe powder for the rest. The self-protecting pile-up welding wire with flux core for continuous welding job has good welding performance, high pile-up layer hardness and high impact resistance.

Description

technical field [0001] A self-shielded surfacing flux-cored welding wire belongs to the field of welding in material processing engineering. The invention is mainly used in the manufacture and on-site repair of shield machine cutter heads for urban subway tunnel excavation. Background technique [0002] The shield construction method appeared in the early 20th century. It can not only avoid large-scale excavation on the ground, increase the excavation speed, but also reduce noise and cost. It is the best choice for urban tunnel construction. However, when the shield construction is opened for repair and tool replacement, it is not only costly and time-consuming, but also easily causes accidents such as ground subsidence. Therefore, it is necessary to extend the tool life as much as possible and reduce the number of times of opening. [0003] In July 2001, the shield tunneling test section of Beijing Metro Line 5 was excavated. This was the first time that the shield tunnelin...

AI Technical Summary

Problems solved by technology

With the full development of subway construction in the Beijing area, cutting tools, as the main wear parts of shield machines, all rely on imports, which are not only expensive, but also time-consuming and expensive to transport, which has a great impact on the progress of subway construction.

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