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Series flux cord welding rod used for pile-up welding reparing and remanufacturing large type medium high carbon steel parts

A flux-cored welding wire, medium-high carbon technology, applied in the field of material science and engineering, can solve the problem of not being able to guarantee that the weldment will not crack

Inactive Publication Date: 2007-07-18
QINHUANGDAO WEIERDE SPECIAL WELDING IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In recent years, many enterprises at home and abroad have tried to repair waste hot rolls, hot molds and other medium and high carbon steel parts or remanufacture these parts by surfacing welding. However, due to their high carbon equivalent, traditional surfacing For welding materials, the weldment must be preheated to about 400°C before welding, and heat treatment must be carried out after welding. Even this cannot guarantee that the weldment will not crack after welding

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0012] Surfacing and remanufacturing hot mold flux cored wire, its chemical composition is (wt%): 10% fluorite, 25% high carbon ferrochrome, 2% high carbon ferromanganese, 5% ferrosilicon, 15% ferromolybdenum, rare earth Oxide 14%, metal nickel 15%, vanadium iron 5%, graphite 0.5%, nitride 6%, aluminum-magnesium alloy 2.5%. The outer skin is made of low carbon steel strip. For ferrosilicon, ferrochromium and ferromanganese, passivation treatment should be carried out according to the aforementioned process before use. The relevant powders in the above formula are mixed with a mixer, and a flux-cored wire is produced with a special flux-cored wire extruder, and dried at 250-300°C. Use the surfacing flux-cored welding wire manufactured above to carry out surfacing welding repair on the scrapped 45Cr2NiMoVSi hot mold, and use a DC welding machine to perform open arc surfacing welding. The welding current is 150-200A and the welding voltage is 70-80V. Without preheating before w...

Embodiment 2

[0014] Surfacing and remanufacturing hot roll flux cored wire, its chemical composition is (wt%): 10% fluorite, 35% high carbon ferrochrome, 15% high carbon ferromanganese, 10% ferrosilicon, 10% ferromolybdenum, rare earth Oxide 8%, metal nickel 10%, vanadium iron 2%, graphite 2%, nitride 2%, aluminum-magnesium alloy 1%. The outer skin is made of low carbon steel strip. Other processes are the same as before. The scrapped 60CrMnMo hot roll is repaired by surfacing welding. After low-temperature preheating before welding and low-temperature tempering after welding, the surface hardness of the remanufactured hot roll through surfacing welding is HRC40-50. After cutting, it can replace the overall produced one. hot rolls.

[0015] The series of surfacing flux-cored welding wires of the present invention are used for surfacing repair and green remanufacturing of medium and high carbon steel parts, which simplifies the manufacturing method, reduces energy consumption, and avoids ...

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Abstract

The present invention discloses a series flux-cored wire for reparation and refabrication of large-size medium-high carbon steel components and parts. Its chemical composition includes (wt%) 5-10 of fluorite, 25-45% of high-carbon ferrochrome, 2-10% of high-carbon manganese iron, 5-8% of tantiron, 10-15% of ferro-molybdenum, 8-14% of rare earth oxide, 5-15% of metal nickel, 2-5% of ferrovanadium, 0.5-2% of graphite, 2-4% of chloride and 1-2.5% of aluminium-magnesium alloy. Its external covering adopts low-carbon steel tape.

Description

technical field [0001] The invention relates to the field of material science and engineering. In particular, it relates to a series of flux-cored welding wires used for overlay welding repair and remanufacturing of large medium and high carbon steel parts. Background technique: [0002] Medium and high carbon steel parts such as hot rolls and hot molds are key components in industrial production. Not only are they large in consumption and expensive, but the quality of their materials directly affects the quantity, quality and production efficiency of products. [0003] The working conditions of these medium and high carbon steel parts are more complicated. Working under mechanical load, thermal load and friction load. Taking hot rolled steel as an example, during the initial rolling process, the surface of the hot rolled roll can directly contact with the red hot steel with a temperature as high as 900-1200°C, and then it is forced to cool by cooling water, continuously e...

Claims

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Application Information

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IPC IPC(8): B23K35/24B23K35/30B23K35/02B23K9/04
Inventor 杨庆祥
Owner QINHUANGDAO WEIERDE SPECIAL WELDING IND
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