Flux cored electrode

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.

1 . 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.  
   
   
       2 . A flux cored electrode as defined in  claim 1  wherein said magnesium particles are formed by gas atomization of molten magnesium.  
   
   
       3 . A flux cored electrode as defined in  claim 2  wherein said magnesium particles are coated with a layer of organic compound with a thickness of less than 10 microns.  
   
   
       4 . A flux cored electrode as defined in  claim 1  wherein said magnesium particles are coated with a layer of organic compound with a thickness of less than 10 microns.  
   
   
       5 . A flux cored electrode as defined in  claim 4  wherein said fluxing system is based upon titanum dioxide.  
   
   
       6 . A flux cored electrode as defined in  claim 3  wherein said fluxing system is based upon titanum dioxide.  
   
   
       7 . A flux cored electrode as defined in  claim 2  wherein said fluxing system is based upon titanum dioxide.  
   
   
       8 . A flux cored electrode as defined in  claim 1  wherein said fluxing system is based upon titanum dioxide.  
   
   
       9 . A flux cored electrode as defined in  claim 8  wherein said core includes particles of alloying agents.  
   
   
       10 . A flux cored electrode as defined in  claim 7  wherein said core includes particles of alloying agents.  
   
   
       11 . A flux cored electrode as defined in  claim 6  wherein said core includes particles of alloying agents.  
   
   
       12 . A flux cored electrode as defined in  claim 5  wherein said core includes particles of alloying agents.  
   
   
       13 . A flux cored electrode as defined in  claim 4  wherein said core includes particles of alloying agents.  
   
   
       14 . A flux cored electrode as defined in  claim 3  wherein said core includes particles of alloying agents.  
   
   
       15 . A flux cored electrode as defined in  claim 2  wherein said core includes particles of alloying agents.  
   
   
       16 . A flux cored electrode as defined in  claim 1  wherein said core includes particles of alloying agents.  
   
   
       17 . A flux cored electrode as defined in  claim 16  wherein said electrode is self shielding and said core includes aluminum particles with the weight of said aluminum particles being greater than the weight of said magnesium particles.  
   
   
       18 . A flux cored electrode as defined in  claim 8  wherein said electrode is self shielding and said core includes aluminum particles with the weight of said aluminum particles being greater than the weight of said magnesium particles.  
   
   
       19 . A flux cored electrode as defined in  claim 4  wherein said electrode is self shielding and said core includes aluminum particles with the weight of said aluminum particles being greater than the weight of said magnesium particles.  
   
   
       20 . A flux cored electrode as defined in  claim 2  wherein said electrode is self shielding and said core includes aluminum particles with the weight of said aluminum particles being less than the weight of said magnesium particles.  
   
   
       21 . A flux cored electrode as defined in  claim 1  wherein said electrode is self shielding and said core includes aluminum particles with the weight of said aluminum particles being less than the weight of said magnesium particles.  
   
   
       22 . A flux cored electrode as defined in  claim 21  wherein said magnesium particles are coated with a layer of a silicon compound with a thickness of less than 10 microns.  
   
   
       23 . A flux cored electrode as defined in  claim 16  wherein said magnesium particles are coated with a layer of a silicon compound with a thickness of less than 10 microns.  
   
   
       24 . A flux cored electrode as defined in  claim 8  wherein said magnesium particles are coated with a layer of a silicon compound with a thickness of less than 10 microns.  
   
   
       25 . A flux cored electrode as defined in  claim 2  wherein said magnesium particles are coated with a layer of a silicon compound with a thickness of less than 10 microns.  
   
   
       26 . A flux cored electrode as defined in  claim 1  wherein said magnesium particles are coated with a layer of a silicon compound with a thickness of less than 10 microns.  
   
   
       27 . A method of electric arc welding on a workpiece, said method comprising: 
 (a) providing a flux cored electrode with spherical particles of elemental magnesium having a graded particle size of less than about 0.025 inches in diameter;    (b) passing a current through said electrode and between said electrode and workpiece to melt said electrode into molten metal whereby said magnesium particles are melted and reduce free oxygen in said molten metal; and,    (c) forcing a shielding gas around said molten metal.    
   
   
       28 . A gas shielded flux cored electrode with a core comprising: 
 titanium dioxide    ferro alloys    magnesium    wherein the magnesium is in the form of particles with a generally spherical shape and a graded size less than about 0.025 inches in diameter.    
   
   
       29 . A self shielded flux cored electrode with a core comprising: 
 titanium dioxide    ferro alloys    aluminum    magnesium    wherein the magnesium is in the form of particles with a generally spherical shape and a graded size less than about 0.025 inches in diameter.    
   
   
       30 . A flux cored electrode as defined in  claim 29  wherein said aluminum in particle form is greater in weight than said magnesium.  
   
   
       31 . A flux cored electrode as defined in  claim 30  wherein said core includes MgO.  
   
   
       32 . A flux cored electrode as defined in  claim 29  wherein said core includes MgO.  
   
   
       33 . A flux cored electrode as defined in  claim 28  wherein said core includes MgO.  
   
   
       34 . A flux cored electrode as defined in  claim 33  wherein said core includes less than 0.01 percent hydrated magnesium.  
   
   
       35 . A flux cored electrode as defined in  claim 32  wherein said core includes less than 0.01 percent hydrated magnesium.  
   
   
       36 . A flux cored electrode as defined in  claim 31  wherein said core includes less than 0.01 percent hydrated magnesium.  
   
   
       37 . A flux cored electrode as defined in  claim 30  wherein said core includes less than 0.01 percent hydrated magnesium.  
   
   
       38 . A flux cored electrode as defined in  claim 29  wherein said core includes less than 0.01 percent hydrated magnesium.  
   
   
       39 . A flux cored electrode as defined in  claim 28  wherein said core includes less than 0.01 percent hydrated magnesium.  
   
   
       40 . A magnesium powder particle for use in a flux cored electrode, said powder particle having a surface tension created smooth outer surface and a graded size less than about 0.025 inches in diameter.  
   
   
       41 . A magnesium powder particle as defined in  claim 40  wherein said particle as a graded size greater than about 0.002 inches in diameter.  
   
   
       42 . A magnesium powder particle as defined in  claim 41  wherein said particle has a coating of less than about 10 microns.  
   
   
       43 . A magnesium powder particle as defined in  claim 40  wherein said particle has a coating of less than about 10 microns.