Iron-based flux-cored wire and preparation method thereof

A technology of iron-based flux-cored and flux-cored wire, applied in welding equipment, welding media, manufacturing tools, etc., can solve the problems of unfavorable continuous welding, low welding efficiency, poor welding processability, etc., and achieve reduction of welding heat input, The effect of high welding current density and improved strength

Inactive Publication Date: 2015-10-28
XIAN AEROSPACEMOTOR MACHINE FACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the shortcomings of poor welding processability, low welding efficiency and unfavorable continuous welding in the prior art, the present invention proposes an iron-based flux-cored welding wire

Method used

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  • Iron-based flux-cored wire and preparation method thereof
  • Iron-based flux-cored wire and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] This embodiment is an iron-based flux-cored welding wire and a preparation method thereof.

[0031] The iron-based flux-cored wire consists of 2.5% to 5% of ferrosilicon, 5% to 7% of manganese powder, 0.8% to 2% of chromium powder, 5% to 15% of nickel powder, 0.5% to 1.2% of Composed of molybdenum powder and 69.8% to 86.2% iron powder. In the present embodiment, the content of ferrosilicon is 5%, the content of manganese powder is 7%, the content of chromium powder is 2%, the content of nickel powder is 15%, the content of molybdenum powder is 1.2%, the content of iron powder is 69.8%. The stated percentages are all mass percentages.

[0032] The specific process for preparing the iron-based flux-cored wire proposed in this embodiment is:

[0033] Step 1, weigh the material. Weigh 5% of ferrosilicon, 7% of manganese powder, 2% of chromium powder, 15% of nickel powder, 1.2% of molybdenum powder and 69.8% of iron powder in proportion, and the percentages are mass perc...

Embodiment 2

[0039] The iron-based flux-cored welding wire proposed in this embodiment is composed of 3% ferrosilicon, 6% manganese powder, 1.5% chromium powder, 10% nickel powder, 1% molybdenum powder and 78.5% iron powder. The percentages are mass percentages.

[0040]The specific process for preparing the iron-based flux-cored wire proposed in this embodiment is:

[0041] Step 1, weigh the material. Weigh 3% of ferrosilicon, 6% of manganese powder, 1.5% of chromium powder, 10% of nickel powder, 1% of molybdenum powder and 78.5% of iron powder, and the percentages are mass percentages.

[0042] Step 2, preparing drug core powder. After mixing the weighed powder evenly, place it in a drying oven for drying at a temperature of 250°C and a drying time of 2.5 hours to ensure that all the free water and bound water in the powder are volatilized to obtain a drug core powder.

[0043] Step 3, preparing flux-cored welding wire. The low-carbon steel strip is placed on the unloading machine o...

Embodiment 3

[0047] The iron-based flux-cored welding wire proposed in this embodiment is composed of 5% ferrosilicon, 7% manganese powder, 2% chromium powder, 11% nickel powder, 1.2% molybdenum powder and 73.5% iron powder. The percentages are mass percentages.

[0048] The specific process for preparing the iron-based flux-cored wire proposed in this embodiment is:

[0049] Step 1, weigh the material. Weigh 5% of ferrosilicon, 7% of manganese powder, 2% of chromium powder, 11% of nickel powder, 1.2% of molybdenum powder and 73.5% of iron powder, and the percentages are mass percentages.

[0050] Step 2, preparing drug core powder. After mixing the weighed powder evenly, place it in a drying oven for drying at a temperature of 300°C and a drying time of 2.2 hours to ensure that all the free water and bound water in the powder are volatilized to obtain a drug core powder.

[0051] Step 3, preparing flux-cored welding wire. The low-carbon steel strip is placed on the unloading machine ...

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Abstract

The invention discloses an iron-based flux-cored wire and a preparation method thereof. The flux core comprises the following components in percentage by mass: 2.5%-5% of silicon iron, 5%-7% of manganese powder, 0.8%-2% of chromium powder, 5%-15% of nickel powder, 0.5%-1.2% of molybdenum powder and the balance of iron powder. The iron-based flux-cored wire can reduce brittleness and martensite structure specific gravity of a heat-affected zone of a steel welding joint, can increase welding seam toughness storage, is used for 31Si2MnCrMoVE steel welding, and avoids welding cold cracks. The iron-based flux-cored wire has good welding processing property, and is free of a slag inclusion problem in a welding process; and a welding seam surface is smooth and flat, is not required to clear after being welded, and is high in deposition rate; and in comparison with a solid-cored welding wire, the production efficiency is improved by 1.2-1.5 times. The preparation method for the iron-based flux-cored wire is simple, convenient to operate, and suitable for batched production.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and in particular relates to an iron-based flux-cored welding wire for welding 31Si2MnCrMoVE steel and a preparation method thereof. Background technique [0002] 31Si2MnCrMoVE steel is an ultra-high-strength steel with excellent properties such as high tensile strength, high toughness, high yield ratio (s / b), high specific strength (ratio of strength to density) and formability. It is used in the defense industry and aerospace equipment. The application in is becoming more and more extensive. In particular, the ultra-high-strength steel specially used for solid rocket motor shells has an alloy element content of less than 5%, which is a low-alloy ultra-high-strength steel. [0003] 31Si2MnCrMoVE steel is a medium-carbon quenched and tempered steel independently developed by my country. This steel has high carbon content, many types of alloy elements, a large hardening tendency, poor w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K35/40
CPCB23K35/3066B23K35/0266B23K35/406
Inventor 王常建胡春海王卫玲秦占领张黎旭杨军王秉祥何星黄南南任长洁熊然马国栋
Owner XIAN AEROSPACEMOTOR MACHINE FACTORY
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