Low-hydrogen, low-nitrogen, low-oxygen welding flux

A welding flux suitable for submerged arc welding, which comprises CaO, MgO, Al.sub.2 O.sub.3 and SiO.sub.2, wherein the proportions of the above four components to the total amount thereof taken as 100% all in the following respective ranges:

• CaO:
• 10 to 60%
• MgO:
• Not more than 30%
• Al.sub.2 O.sub.3 :
• 20 to 70%
• SiO.sub.2 :
• 5 to 40%
• and wherein the total amount of said four components accounts for not less than 35% of the total weight of said flux less any CO.sub.2 component thereof, said flux further contains CaF.sub.2 in an amount of from 25 to 65% of the total weight of said flux less the CO.sub.2 component thereof, the basicity (B) of said flux is not less than 1.0 calculated in accordance with the formula (I) ##EQU5## wherein N denotes the mol percentage of the respective components, said flux contains both a fused substance and a non-fused substance, said fused substance has undergone an air-cooling treatment, and the basicity (B) of said fused substance calculated in accordance with the formula (I) is not more than 3.0.

A welding flux suitable for submerged arc welding, which comprises CaO, MgO, Al.sub.2 O.sub.3 and SiO.sub.2, wherein the proportions of the above four components to the total amount thereof taken as 100% fall in the following respective ranges:

• CaO:
• 10 to 60%
• MgO:
• Not more than 30%
• Al.sub.2 O.sub.3 :
• 20 to 70%
• SiO.sub.2 :
• 5 to 40%
• and wherein the total amount of said four components accounts for not less than 35% of the total weight of said flux less any CO.sub.2 component thereof, said flux further contains CaF.sub.2 in an amount of from 15 to 60% of the total weight of said flux less the CO.sub.2 component thereof, the basicity (B) of said flux is not less than 1.0 calculated in accordance with the formula (I) ##EQU6## wherein N denotes the mol percentage of the respective components, said flux contains both a fused substance and a non-fused substance, said fused substance has undergone a water-cooling treatment, the basicity (B) of said fused substance calculated in accordance with the formula (I) is not more than 2.7, and said non-fused substance contains a carbonate mineral or carbonate minerals in an amount such that the CO.sub.2 constituting said carbonate mineral or minerals, as reduced to CO.sub.2 gas, accounts for a proportion of from 0.2 to 5.0% of the total weight of said flux less the CO.sub.2 component thereof.

A welding flux suitable for submerged arc welding, which comprises CaO, MgO, Al.sub.2 O.sub.3 and SiO.sub.2, wherein the proportions of the above four components to the total amount thereof taken as 100% fall in the following respective ranges:

• CaO:
• 10 to 60%
• MgO:
• Not more than 30%
• Al.sub.2 O.sub.3 :
• 20 to 70%
• SiO.sub.2 :
• 5 to 40%
• and wherein the total amount of said four components accounts for not less than 35% of the total weight of said flux less any CO.sub.2 component thereof, said flux further contains CaF.sub.2 in an amount of from 15 to 65% of the total weight of said flux less the CO.sub.2 component thereof, the basicity (B) of said flux is not less than 1.0 calculated in accordance with the formula (I) ##EQU7## wherein N denotes the mol percentage of the respective components, said flux contains both a fused substance and a non-fused substance, said fused substance has undergone an air-cooling treatment, the basicity (B) of said fused substance calculated in accordance with the formula (I) is not more than 3.0, and said non-fused substance contains a carbonate mineral or carbonate minerals in an amount such that the CO.sub.2 constituting said carbonate mineral or minerals, as reduced to CO.sub.2 gas, accounts for a proportion of from 0.2 to 5.0% of the total weight of said flux less the CO.sub.2 component thereof.

A welding flux suitable for submerged arc welding, which comprises CaO, MgO, Al.sub.2 O.sub.3 and SiO.sub.2, wherein the proportions of the above four components to the total amount thereof taken as 100% fall in the following respective ranges:

• CaO:
• 10 to 60%
• MgO:
• Not more than 30%
• Al.sub.2 O.sub.3 :
• 20 to 70%
• SiO.sub.2 :
• 5 to 40%
• and wherein the total amount of said four components accounts for not less than 35% of the total weight of said flux less any CO.sub.2 component thereof, said flux further contains CaF.sub.2 in an amount of from 15 to 65% of the total weight of said flux less the CO.sub.2 component thereof, the basicity (B) of said flux is not less than 1.0 calculated in accordance with the formula (I) ##EQU8## wherein N denotes the mol percentage of the respective components, said flux contains both a fused substance and a non-fused substance, said fused substance has undergone a quick air-cooling treatment, and said non-fused substance contains a carbonate mineral or carbonate minerals in an amount such that the CO.sub.2 constituting said carbonate mineral or minerals, as reduced to CO.sub.2 gas, accounts for a proportion of from 0.2 to 5.0% of the total weight of said flux less the CO.sub.2 component thereof.

A welding flux suitable for submerged arc welding, which comprises CaO, MgO, Al.sub.2 O.sub.3 and SiO.sub.2, wherein the proportions of the above four components to the total amount thereof taken as 100% fall in the following respective ranges:

• CaO:
• 10 to 60%
• MgO:
• Not more than 30%
• Al.sub.2 O.sub.3 :
• 20 to 70%
• SiO.sub.2 :
• 5 to 40%
• and wherein the total amount of said four components accounts for not less than 35% of the total weight of said flux less any CO.sub.2 component thereof, said flux further contains CaF.sub.2 in an amount of from 25 to 65% of the total weight of said flux less the CO.sub.2 component thereof, the basicity (B) of said flux is not less than 1.0 calculated in accordance with the formula (I) ##EQU9## wherein N denotes the mol percentage of the respective components, said flux contains both a fused substance and a non-fused substance, said fused substance has undergone an air-cooling treatment, said fused substance contains CaF.sub.2 in an amount of not less than 25% and said non-fused substance contains a carbonate mineral or carbonate minerals in an amount such that the CO.sub.2 constituting said carbonate mineral or minerals, as reduced to CO.sub.2 gas, accounts for a proportion of from 0.2 to 5.0% of the total weight of said flux less the CO.sub.2 component thereof.

A welding flux suitable for submerged arc welding, which comprises CaO, MgO, Al.sub.2 O.sub.3 and SiO.sub.2, wherein the proportions of the above four components to the total amount thereof taken as 100% fall in the following respective ranges:

• CaO:
• 10 to 60%
• MgO:
• Not more than 30%
• Al.sub.2 O.sub.3 :
• 20 to 70%
• SiO.sub.2 :
• 5 to 40% and wherein the total amount of said four components accounts for not less than 35% of the toal weight of said flux less any CO.sub.2 components thereof, said flux further contains CaF.sub.2 in an amount of from 25 to 65% of the total weight of said flux less the CO.sub.2 component thereof, the basicity (B) of said flux is not less than 1.0 calculated in accordance with formula (I) ##EQU10## wherein N denotes the mol percentage of the respective components, said flux contains both a fused substance and a non-fused substance, said fused substance has undergone a quick air-cooling treatment, and said non-fused substance contains a carbonate mineral or carbonate minerals in an amount such that the CO.sub.2 constituting said carbonate mineral or minerals, as reduced to CO.sub.2 gas, accounts for a proportion of from 0.2 to 5.0% of the total weight of said flux less the CO.sub.2 thereof.

A welding flux suitable for submerged arc welding, which comprises CaO, MgO, Al.sub.2 O.sub.3 and SiO.sub.2, wherein the proportions of the above four components to the total amount thereof taken as 100% fall in the following respective ranges:

• CaO:
• 10 to 60%
• MgO:
• Not more than 30%
• Al.sub.2 O.sub.3 :
• 20 to 70%
• SiO.sub.2 :
• 5 to 40%
• and wherein the total amount of the above four components accounts for not less than 35% of the total weight of said flux less any CO.sub.2 component thereof, said flux further contains CaF.sub.2 in an amount of from 25 to 65% of the total weight of said flux less the CO.sub.2 component thereof, the basicity (B) of said flux is not less than 1.0 calculated in accordance with the formula (I) ##EQU11## wherein N denotes the mol percentage of the respective components, said flux contains both a fused substance and a non-fused substance, said fused substance has undergone a quick air-cooling treatment, said fused substance contains CaF.sub.2 in an amount of not less than 25%, and said non-fused substance contains a carbonate mineral of carbonate minerals in an amount such that the CO.sub.2 constituting said carbonate mineral or minerals, as reduced to CO.sub.2 gas, accounts for a proportion of from 0.2 to 5.0% of the total weight of said flux less the CO.sub.2 component thereof.