Electroslag boss and process

In the process wherein a metallic boss is joined to the convex surface of a metal pipe wall having a topside and an underside by building up on said wall a weld metal deposit formed from electroslag welding, the improvement comprising forming said metallic boss by providing a pipe wall having therein a downwardly tapered hole which is circular in cross-section and completely peripherally enclosed by metal of the pipe wall defining said hole, and said hole extending throughout the thickness of said wall, wherein prior to building up said weld metal deposit, said hole is filled with metal by forming molten metal in said hole, and supporting said molten metal in said hole from the underside of said wall, said molten metal being formed in said hole from electroslag deposited metal and from the melting of portions of the wall contiguous said hole with heat generated by said electroslag welding, and cooling said molten metal thereby metallurgically integrating said electroslag metal with metal of the wall in the region of said hole, thereby forming said metallic boss which protrudes from said wall.

In the process wherein a metallic boss having a fillet is joined to a metal base by building up on the base a weld metal deposit formed from electroslag welding, the improvement comprising forming said boss by providing a metal base having therein a hole completely peripherally enclosed by metal of the base defining said hole and having a surface opening smaller than the portion of the boss at the place where it is joined to the metal base, wherein prior to building up said weld metal deposit, said hole is filled with metal by forming molten metal in said hole with heat generated by said electroslag welding, said molten metal being formed in said hole from electroslag deposited metal and from the melting of portions of the base contiguous said hole, and including melting portions of the base extending outwardly from said surface opening with heat generated by said electroslag welding by forming said boss so that at the place where it is joined to said base, it is larger than said surface opening, and cooling said molten metal thereby metallurgically integrating said electroslag metal with metal of the base in the region of said hole and including the region of the base extending outwardly from said surface opening, thereby forming said metallic boss which protrudes from said base.