Electroslag welding nozzle and process

Claim 2

A consumable metallic nozzle for generally vertical electroslag welding having a single longitudinally extending metallic guide tube, metal wing bars extending out from the guide tube at two sides thereof and welded to the guide tube at one edge of each wing bar, and an adhering coating of electroslag flux extending completely around the nozzle cross section over the exposed sides of the guide tube and the exposed sides and edges of the wing bars throughout the length of the nozzle to one end thereof.

Claim 3

A nozzle of claim 1, in which the guide tube extends at the one end thereof beyond the wing bars and is free from coating of flux at that location.

Claim 4

A nozzle of claim 1, in which the flux includes sodium silicate binder and based on the weight of other ingredients has the following composition by weight: Calcium flouride 2- 10 percent Silica 34- 42 percent Manganous oxide 2- 10 percent Alumina 10- 28 percent Lime 20- 32 percent Magnesia 6- 20 percent

Claim 5

A nozzle of claim 1, which the wing bars in cross section are disposed at an angle to one another which on one side is less than 180*.

Claim 6

A nozzle of claim 1, in which the horizontal cross section is triangular.

Claim 7

A nozzle of claim 1, which varies in cross section along its length.

Claim 8

A nozzle of claim 1, which has an axis, the axis curving from end to end of the nozzle.

Claim 9

A consumable nozzle for generally vertical electroslag welding, comprising opposed bars extending longitudinally of the nozzle in face-to-face engagement, at least one of said bars having near the middle a groove adjoining the other bar, fastening means holding the bars together, and an adhering coating of electroslag flux extending completely around the nozzle cross section over the exposed sides and edges of the bars throughout the length of the nozzle to one end thereof.

Claim 10

A consumable nozzle for generally vertical electroslag welding, comprising opposed bars extending longitudinally of the nozzle in face-to-face engagement, at least one of said bars having near the middle a groove adjoining the other bar, fastening means holding the bars together, and an adhering coating of electroslag flux extending completely around the nozzle cross section over the exposed sides and edges of the bars throughout the length of the nozzle to one end thereof.

Claim 11

A process of making electroslag vertical welds between metallic plates having a plate thickness in excess of 40 mm. and controlling flux additions to the slag, which comprises forming a weld space to be welded between spaced vertical plates each having a thickness in excess of 40 mm., closing the edges of the weld space against leakage, establishing in the weld space a layer of molten metal and on top of it a layer of molten slag, inserting into the weld space a downwardly depending consumable metallic nozzle having a downwardly extending metallic guide tube and metallic wing bars supported thereon in electrical contact with the sides of the guide tube, and having an adhering coating of finely divided electroslag flux and a bond surrounding the outer surface of the guide tube and the wing bars, the bottom of the consumable nozzle engaging the molten slag near the top, and the nozzle being vertically and horizontally stationary in the weld space, inserting a consumable metallic electrode through the guide tube into the molten slag, maintaining a welding voltage between the consumable nozzle, and through the consumable nozzle to the electrode, on the one hand, and the metal plates to be welded on the other hand, so as to distribute electric current to the molten slag through the electrode and also through the consumable nozzle, including the wing bars, progressively melting off the nozzle as the top level of the molten slag rises and progressively melting off flux from the nozzle to add to the molten slag as the top level of the molten slag rises.

Claim 12

A process of making electroslag vertical welds between metallic plates having a plate thickness in excess of 40 mm. and controlling flux additions to the slag, which comprises forming a weld space to be welded between spaced vertical plates each having a thickness in excess of 40 mm., closing the edges of the weld space against leakage, establishing in the weld space a layer of molten metal and on top of it a layer of molten slag, inserting into the weld space a downwardly depending consumable metallic nozzle having a downwardly extending metallic guide tube and metallic wing bars supported thereon in electrical contact with the sides of the guide tube, and having an adhering coating of finely divided electroslag flux and a bond surrounding the outer surface of the guide tube and the wing bars, the bottom of the consumable nozzle engaging the molten slag near the top, and the nozzle being vertically and horizontally stationary in the weld space, inserting a consumable metallic electrode through the guide tube into the molten slag, maintaining a welding voltage between the consumable nozzle, and through the consumable nozzle to the electrode, on the one hand, and the metal plates to be welded on the other hand, so as to distribute electric current to the molten slag through the electrode and also through the consumable nozzle, including the wing bars, progressively melting off the nozzle as the top level of the molten slag rises and progressively melting off flux from the nozzle to add to the molten slag as the top level of the molten slag rises.

Claim 13

A process of making electroslag vertical welds between metallic plates having a plate thickness in excess of 40 mm. and controlling flux additions to the slag, which comprises forming a weld space to be welded between spaced vertical plates each having a thickness in excess of 40 mm., closing the edges of the weld space against leakage, establishing in the weld space a layer of molten metal and on top of it a layer of molten slag, inserting into the weld space a downwardly depending consumable metal nozzle having metallic bars in face-to-face engagement secured to one another and provided with a guiding passageway at the middle of at least one bar, and having an adhering coating of finely divided electroslag flux and a bond surrounding the outer surface of the metallic parts of the nozzle, the bottom of the consumable nozzle engaging the molten slag near the top, and the nozzle being vertically and horizontally stationary in the weld space, inserting a consumable metallic electrode through the guide tube into the molten slag, maintaining a welding voltage between the consumable nozzle, and through the consumable nozzle to the electrode, on the one hand, and the metal plates to be welded on the other hand, so as to distribute electric current to to the molten slag through the electrode and also through the consumable nozzle, progressively melting off the nozzle as the top level of the molten slag rises and progressively melting off flux from the nozzle to add to the molten slag as the top level of the molten slag rises.

Claim 14

A process of making electroslag vertical welds between metallic plates having a plate thickness in excess of 40 mm. and controlling flux additions to the slag, which comprises forming a weld space to be welded between spaced vertical plates each having a thickness in excess of 40 mm., closing the edges of the weld space against leakage, establishing in the weld space a layer of molten metal and on top of it a layer of molten slag, inserting into the weld space a downwardly depending consumable metal nozzle having metallic bars in face-to-face engagement secured to one another and provided with a guiding passageway at the middle of at least one bar, and having an adhering coating of finely divided electroslag flux and a bond surrounding the outer surface of the metallic parts of the nozzle, the bottom of the consumable nozzle engaging the molten slag near the top, and the nozzle being vertically and horizontally stationary in the weld space, inserting a consumable metallic electrode through the guide tube into the molten slag, maintaining a welding voltage between the consumable nozzle, and through the consumable nozzle to the electrode, on the one hand, and the metal plates to be welded on the other hand, so as to distribute electric current to to the molten slag through the electrode and also through the consumable nozzle, progressively melting off the nozzle as the top level of the molten slag rises and progressively melting off flux from the nozzle to add to the molten slag as the top level of the molten slag rises.