Flux-cored wire for visible arc overlaying of high-chromium cast iron

A technology of high-chromium cast iron and high-carbon ferrochrome, which is applied in the direction of arc welding equipment, welding equipment, welding equipment, etc., can solve the problems of waste of surfacing welding materials, rising construction costs, and large weld penetration, so as to reduce construction costs , arc stability, ultra-high hardness and the effect of corrosion resistance

Inactive Publication Date: 2012-06-27
天津大桥金属焊丝有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it has the following disadvantages: the penetration depth of the weld is relatively large, and the dilution of the base metal to the material is relatively serious. It often requires multiple layers of surfacing welding to achieve the required hardness value of HRC60, so the waste of surfacing welding materials is...

Method used

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  • Flux-cored wire for visible arc overlaying of high-chromium cast iron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4

[0015] Embodiment 1-4 Preparation of high chromium cast iron open arc surfacing welding flux-cored wire of the present invention

[0016] The outer steel strip of the welding wire is a low-carbon cold-rolled steel strip with a width of 16mm and a thickness of 0.30mm; its chemical composition is shown in Table 1.

[0017] Table 1. Chemical composition of low-carbon cold-rolled steel strip (mass fraction)

[0018] C mn Si S P ≤0.05 0.18-0.26 ≤0.10 ≤0.03 ≤0.03

[0019] Take each raw material powder according to Table 2, mix it evenly, put it into the powder adding device of the flux-cored welding wire forming machine, and add the powder evenly to the flux-cored welding wire that is gradually rolled and formed. Then the wire is drawn into a flux-cored wire with a diameter of 2.4 to 3.2 mm through a wire drawing machine.

[0020]

[0021] Table 2 Formula of powder mass fraction of flux-cored wire for open-arc surfacing welding of high-chromium cast ir...

experiment example 1～4

[0024] Using the flux-cored welding wire prepared in Examples 1-4 of the present invention, a welding machine with a flat characteristic power supply is used to directly carry out surfacing welding, and the surfacing welding current is selected as 400A. It is observed that there are transverse microcracks on the surface of the weld, and the appearance of cracks can reduce the stress generated during the surfacing process and prevent spalling.

experiment example 5～8

[0026] The flux-cored welding wires prepared in Examples 1-4 of the present invention were tested, and the test results are shown in Table 3.

[0027]

[0028] Table 3 Chemical composition (mass fraction) of deposited metal of high chromium cast iron open arc surfacing welding in Examples 1-4

[0029] Average hardness (HRC) C mn Si S P Cr other Implementation 1 60.2 4.88 1.80 1.50 0.014 0.015 25.8 3.0 Implementation 2 60.5 4.90 1.82 1.52 0.012 0.016 26.0 3.0 Implementation 3 60.8 4.92 1.78 1.55 0.015 0.018 26.2 3.0 Implementation 4 61.0 5.00 1.85 1.50 0.013 0.016 26.4 3.0

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Abstract

The invention relates to a flux-cored wire for the visible arc overlaying of high-chromium cast iron. According to the flux-cored wire, a flux core comprises the following components in percentage by mass: 40 to 60 percent of high-carbon ferrochromium, 1 to 6 percent of graphite, 4 to 8 percent of electrolytic manganese, 2 to 6 percent of low ferrosilicon, 10 to 30 percent of metal chromium, 8 to 15 percent of aluminum magnesium alloy and 10 to 20 percent of other alloys. When the flux-cored wire is used for welding, a dilution rate is low, an electric arc is stable, a weld joint does not have slag and has ultrahigh hardness and corrosion resistance, and the overlaying can be performed directly without addition of soldering fluxes and protective gas, so that the construction cost is reduced, and the inconvenience of the operation is reduced.

Description

technical field [0001] The invention relates to the technical field of welding materials, in particular to a high-chromium cast iron open-arc surfacing flux-cored welding wire and a preparation method thereof. Background technique [0002] High-chromium cast iron material has relatively good wear resistance and certain corrosion resistance. Domestic enterprises usually use this material when surfacing coal grinding rollers and grinding discs. At the same time, they will use submerged arc welding wire and flux for surfacing. However, it has the following disadvantages: the penetration depth of the weld is relatively large, and the dilution of the base metal to the material is relatively serious. It often requires multiple layers of surfacing welding to achieve the required hardness value of HRC60, so the waste of surfacing welding materials is inevitable; in addition, Since submerged arc welding must comply with many and strict operating specifications, including some devices...

Claims

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Application Information

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IPC IPC(8): B23K35/368B23K9/18
Inventor 郑子行杨敬雷郑子新杨新禄杨钢杨天文
Owner 天津大桥金属焊丝有限公司
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