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

A flux-cored wire, self-protection technology, applied in welding media, welding equipment, welding/cutting media/materials, etc., can solve the problems of subway construction impact, time-consuming transportation, and high cost, and achieve impact mitigation and welding space. Small, low cost effect

Inactive Publication Date: 2008-10-22
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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

Examples

Experimental program
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Effect test

Embodiment Construction

[0027] All embodiment welding wires all are multifunctional powder core wire material drawing machine to go out:

[0028] 1. Select H08A cold-rolled steel strip of 10×0.3mm (10mm in width and 0.3mm in thickness). Roll it into a U shape first. Take 1.5 kg of high-carbon ferrochrome powder, 3.5 kg of metal chromium powder, 0.2 kg of ferromolybdenum powder, 0.5 kg of ferro-vanadium powder, 1.5 kg of silicon-manganese alloy powder, 0.1 kg of aluminum-magnesium alloy powder, 0.2 kg of ferro-boron, and 2.5 kg of iron powder . (The particle size of the powder taken is that it can pass through a 60-mesh sieve). The various powders taken are put into a powder mixer and mixed for 10 minutes, and then the mixed powders are added into a U-shaped H08A cold-rolled steel strip groove, and the filling rate is 35%. Close the U-shaped groove so that the medicine powder is wrapped in it, and then gradually reduce the diameter through the wire drawing die to make the diameter reach 1.6mm. Thr...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/24
Inventor 蒋建敏贺定勇赵学彬蒋旻赵有恒邹积波韩文政李京林
Owner BEIJING UNIV OF TECH
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