(1) self-protection

Cored combination of microcrystalline graphite, high carbon alloy, aluminum-magnesium alloy, ferrosilicon, ferromanganese, titanium, boron, iron and rare earth and other substances through the direct consumption of oxygen, nitrogen, and reduce ambient oxygen, nitrogen sub- pressure in two ways, oxidation of the surrounding gas to weaken successful in achieving a flux cored wire making gas - alloy elements of self-protection.

There is a strong oxidizing carbon at high temperatures generated after reduction of the CO oxidation can reduce the gas phase N2, O2 sub-pressure, can be used as the mothe Flux Cored Welding Wireself-protection mechanism and wear resistance analysis and discussion
 

  (1) self-protection

Cored combination of microcrystalline graphite, high carbon alloy, aluminum-magnesium alloy, ferrosilicon, ferromanganese, titanium, boron, iron and rare earth and other substances through the direct consumption of oxygen, nitrogen, and reduce ambient oxygen, nitrogen sub- pressure in two ways, oxidation of the surrounding gas to weaken successful in achieving a flux cored wire making gas - alloy elements of self-protection.

There is a strong oxidizing carbon at high temperatures generated after reduction of the CO oxidation can reduce the gas phase N2, O2 sub-pressure, can be used as the molten pool under the arc shielding gas; carbon oxidation caused by the molten pool boiling is also conducive to N2 escape.

Aluminum at high temperatures with high activity and very strong deoxygenation, denitrification, and can effectively reduce the sensitivity of the weld pores can often play a dual role of deoxidation and nitrogen fixation. Magnesium boiling point of 1100 ° C can be formed in the arc of live steam, and combined with N, O, can be to protect the role of the droplet.

Silicon, manganese joint  Welding Wire metallurgy most commonly used deoxidation in the segment, could be better deoxidation effect.

Boron and titanium in the high temperature and the oxygen affinity is strong, but also react with nitrogen to generate a high melting point, BN, TiN, which not only reduce the harmful effects of nitrogen, but also to refine the crystalline core of the solidification of the molten pool of metal The role of the grain.

RE is the general term of the 14 elements of the 4f Department, is highly reactive and can react with nitrogen at 750 ℃, 180 ~ 200 ℃ can be oxidized in the air Re2O3 generated rare-earth nitrides ReN can play the role of denitrification of deoxy . RE can effectively reduce the sensitivity of the pore in the weld deposited metal oxygen content decreased, the total nitrogen content was controlled within a certain range, reducing the harmful effects of nitrogen. The amount of rare earth elements can improve the shape of the weld metal structure, grain refinement.

(2) high wear resistance

Further analysis of the wear and abrasion mechanism of the development of flux cored wire surfacing layer, but also on the wet sand specimen wear scar scanning electron microscopy analysis of the surfacing layer of the worn surface of both scratches, furrows, another carbide brittle crack, and the wear mechanism of the actual working conditions the same.

Surfacing layer by wear and tear, does not appear the phenomenon of carbide prominence of the matrix, carbide and the matrix strength and toughness to match, mutual support and protection hinder the abrasive cutting, a good two-way protection, fully play the role of carbide wear improved overall abrasion resistance of the surfacing layer.

The size distribution and morphology of the carbides in the hardfacing layer of micro-cracks and extended play an important role.

Good abrasive wear resistance of the surfacing layer of 58-O ,60-O It is thanks to the optimization of microstructure: number of carbides evenly distributed, with martensite and a small amount of residual austenite matrix excellent strength and toughness match. The primary carbides was perpendicular to the wear surface of the thin rod-shaped, granular eutectic carbides.

Of course, the multi-alloy reinforced high chromium cast iron alloy system, flux cored wire and welding equipment and process parameters, a good match, good welding performance is a key element of the flux cored wire surfacing storey wear resistance.lten pool under the arc shielding gas; carbon oxidation caused by the molten pool boiling is also conducive to N2 escape.

Aluminum at high temperatures with high activity and very strong deoxygenation, denitrification, and can effectively reduce the sensitivity of the weld pores can often play a dual role of deoxidation and nitrogen fixation. Magnesium boiling point of 1100 ° C can be formed in the arc of live steam, and combined with N, O, can be to protect the role of the droplet.

Silicon, manganese joint deoxy welding metallurgy most commonly used deoxidation in the segment, could be better deoxidation effect.

Boron and titanium in the high temperature and the oxygen affinity is strong, but also react with nitrogen to generate a high melting point, BN, TiN, which not only reduce the harmful effects of nitrogen, but also to refine the crystalline core of the solidification of the molten pool of metal The role of the grain.

RE is the general term of the 14 elements of the 4f Department, is highly reactive and can react with nitrogen at 750 ℃, 180 ~ 200 ℃ can be oxidized in the air Re2O3 generated rare-earth nitrides ReN can play the role of denitrification of deoxy . RE can effectively reduce the sensitivity of the pore in the weld deposited metal oxygen content decreased, the total nitrogen content was controlled within a certain range, reducing the harmful effects of nitrogen. The amount of rare earth elements can improve the shape of the weld metal structure, grain refinement.

  Weihai shield welding material-cum-wear Engineering Co., Ltd production of Welding Fluxseries products 9 series 22 varieties, the company fully utilized its own core technology R & D production. Its scope of application covers the room temperature to high temperature conditions of abrasive wear, impact wear, erosion and intermetallic wear different working conditions, with high technical content, working conditions corresponding to strong, long service life, high cost performance characteristics.

According to the Weihai shield Miss Li, the company's production of "Types Of Welding Wire  products to the market, until now, customers reflect the good, she said:" flux-cored wire welding materials, as the fourth generation of its high production efficiency good welding quality, integrated welding and low cost unmatched technical and economic advantages at home and abroad in recent years rapid development. We will use its own core technologies to complete product development production and sales of the product will drive the further development of the three shield