Flux cored electrode

a flux cored electrode and cored electrode technology, which is applied in the direction of metal-working equipment, soldering equipment, manufacturing tools, etc., can solve the problems of high surface reactivity, large surface ratio, and high surface reactivity of thin coating of otherwise high mass reactive magnesium particles, and achieve the effect of preventing oxidation and hydrogen reaction and reducing surface reactivity

Inactive Publication Date: 2006-09-21
LINCOLN GLOBAL INC
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Problems solved by technology

Furthermore, thin coating of the small magnesium particles was a delicate and expensive process.
Consequently, the thin coating of the otherwise high mass reactive magnesium particles with the extreme high surface reactivity, engendered by the large surface ratio, was only theoretical and not practical.
Thus, a suggestion to reduce the surface reactivity of magnesium particles for use in flux cored electrodes was not commercially viable or physically effective.
The spherical particles having small size minimizes the surface area ratio to thereby reduce the effective exposure reactivity of the magnesium particles.
The relative size of the surface area reduces the surface reactivity of the individual particles.
This coating procedure further reduces the surface reactivity of the otherwise smooth surface formed by the gas atomizing process.

Method used

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Embodiment Construction

[0026] To minimize the oxidation of small magnesium particles and the ability of magnesium particles to attract hydrogen, the present invention involves the use of a specially produced magnesium particle, which particles are graded for a selected range of particle sizes. This concept is schematically illustrated in FIGS. 1-3 wherein an air atomizing system 10 includes a molten metal nozzle 20 receiving molten magnesium from supply 22 maintained in a molten condition by heat source 24. Nozzle 20 causes droplets of magnesium to fall by gravity past one or more gas jets 30 having a high velocity spray of gas G directed toward the downwardly traveling individual droplets. These droplets are particles which translate from molten particles P1 to partially solidified particles P2 into fully solid particles P3 as the particles P pass downwardly through gas G from one or more high pressure jet 30. This process is used for producing atomizing magnesium powder for military use and is produced ...

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Abstract

A flux cored electrode including a metal sheath surrounding a core of particles containing a flux system with dispersed magnesium particles in generally spherical shape and having a graded size to pass through a number 30 U.S. Standard sieve.

Description

[0001] The present invention relates to a flux cored electrode used in electric arc welding and more particularly to the use of a specific form of magnesium particles in the core of the electrode or wire. BACKGROUND OF INVENTION [0002] Flux cored electrodes have been used for many years and include an outer metal sheath sized around an inner core of particles forming a flux system. To control the composition of the weld metal formed by using the electrode in an electric arc welding process, the core generally includes a number of metal particles to be melted and alloyed into the weld metal resulting from the welding process. It is common practice to use magnesium particles in the core of the electrode so these particles are evenly dispersed with the other core particles to produce a flux cored electrode. The use of small magnesium particles in flux cored electrodes is common. [0003] The flux in a cored electrode that produces high impact welds while welding vertically up or overhead...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B23K35/02
CPCB23K35/0266B23K35/3608B23K35/368B23K35/406
Inventor KAROGAL, NIKHIL
Owner LINCOLN GLOBAL INC
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