The present disclosure is directed to a tubular welding electrode with a sheath encapsulating a flux core, where the sheath comprises a number of added pores. The added pores may provide escape paths for the outgassing of moisture and hydrocarbons from the flux core when the tubular welding electrode is baked. In addition, the added pores may be used to hold a liquid, such as a lubricant. The added pores may be introduced using a process such as laser drilling or chemical etching, and may be added to a strip of sheath material prior to forming the strip into a tubular welding electrode.

The invention relates to a method for producing a welding wire that includes the steps of providing a hollow wire, through at least part of which at least one cavity extends; producing the welding wire by introducing a welding material containing titanium aluminide or at least one nickel-based superalloy into the at least one cavity, the at least one cavity being evacuated or being filled with a protective gas before, during and/or after the introduction of the welding material, and the hollow wire being formed from nickel if the welding material contains the at least one nickel-based superalloy. Further aspects of the invention relate to a welding wire and to a component having at least one component region obtained by hardfacing using at least one such welding wire.

The present disclosure relates to a method for producing a tubular welding electrode comprising the steps of providing a strip of metal material having a length and first and second surfaces, wherein at least the first surface of the strip is at least substantially coated with nickel or a nickel alloy and then copper or a copper alloy, forming the strip into a “U” shape along the length, filling the “U” shape of the strip with a granular powder flux, and mechanically closing the “U” shape to form a sheath of nickel- and copper-coated metal material that substantially encases the granular powder flux, thus forming a tubular welding electrode. In certain embodiments, the metal material may be steel. In certain other embodiments, the metal material may be nickel or a nickel alloy, which may be at least substantially coated with copper or a copper alloy.

A wire for welding different types of materials and a method of manufacturing the same that enable suppressing the occurrence of non-uniform filling with flux while reducing the flux filling rate are provided. A conductive core wire material and a metal outer skin material are made of aluminum or aluminum alloy. A flux paste is applied to the surface of the conductive core wire material to form a coated conductive core wire material including a coating layer, or a flux paste is applied to the inner surface of the metal outer skin material to form a coated metal outer skin material including a coating layer. A tubular metal outer skin material is formed. The conductive core wire is disposed inside to form a wire for drawing. The flux is disposed as distributed over the longitudinal and circumferential directions of the wire after a solvent in the coating layer is removed.

The present disclosure relates to a method for producing a tubular welding electrode comprising the steps of providing a strip of metal material having a length and first and second surfaces, wherein at least the first surface of the strip is at least substantially coated with nickel or a nickel alloy and then copper or a copper alloy, forming the strip into a U shape along the length, filling the U shape of the strip with a granular powder flux, and mechanically closing the U shape to form a sheath of nickel- and copper-coated metal material that substantially encases the granular powder flux, thus forming a tubular welding electrode. In certain embodiments, the metal material may be steel. In certain other embodiments, the metal material may be nickel or a nickel alloy, which may be at least substantially coated with copper or a copper alloy.

A microporous tubular welding electrode having a length and a circumference may comprise a granular flux fill core extending substantially along the length of the electrode and a sheath extending substantially along the length of the electrode and substantially surrounding and substantially encasing the granular flux fill core. The sheath may comprise a plurality of pores distributed around the circumference and along the length of the microporous tubular welding electrode. The microporous tubular welding electrode may be formed by first creating a plurality of pores in a strip of material (such as a steel or aluminum alloy) using a process such as laser drilling or chemical etching. Second, the strip may be formed into a tubular welding wire electrode containing a core of a granular powder flux material.

The present disclosure relates to a method for producing a tubular welding electrode comprising the steps of providing a strip of copper-coated steel material having a length and first and second surfaces, wherein at least the first surface of the strip is at least substantially coated with a copper alloy, forming the strip into a U shape along the length, filling the U shape of the strip with a granular powder flux, and mechanically closing the U shape to form a sheath of copper-coated steel material that substantially encases the granular powder flux, thus forming a tubular welding electrode.

The present invention relates to a flux cored wire and the method and apparatus for manufacturing the same. The flux cored wire in accordance with the present invention can prevent the flux filled inside strip from leaking out and the moisture in the atmosphere from penetrating into the flux. The method of the present invention also does not require longer processing time. For this, the flux cored wire in accordance with the present invention is comprised of: an inner tubular body formed with flat strip by curling up the side edges of the strip into a tubular body having a seam and filed with flux inside; and an outer tubular body formed with flat strip by curling up the side edges of the strip into a tubular body having a seam and wrapping around the inner tubular body in tight contact.

A metal-cored wire for submerged arc welding having a composition including, in mass %: C: 0.20 to 0.80%, Si: 0.15 to 0.90%, Mn: 17.0 to 28.0%, P: 0.030% or less, S: 0.030% or less, Ni: 0.01 to 10.00%, Cr: 0.4 to 4.0%, Mo: 3.50 to 10.00%, B: 0.0010% or less, N: 0.200% or less, and the balance being Fe and incidental impurities.

An assembly comprising: two ceramic bodies, which are joined by means of a joint of an active hard solder, or braze, wherein the active hard solder, or braze, has a continuous core volume, which is spaced, in each case, from the ceramic bodies by at least 1 m, and an average composition C.sub.K with a liquidus temperature T.sub.l(C.sub.K), wherein the composition C.sub.K has a coefficient of thermal expansion (C.sub.K), wherein (C.sub.K)=m.Math.(K), wherein m1.5, especially m1.3 and preferably m1.2, wherein (K) is the average coefficient of thermal expansion of the ceramic material of the ceramic bodies, wherein the joint has boundary layers, which border on the ceramic body, wherein at least one of the boundary layers, which lies outside of the core volume, has an average composition C.sub.B with a liquidus temperature T.sub.l(C.sub.B), which lies not less than 50 K, preferably not less than 100 K, and especially preferably not less than 200 K, under the liquidus temperature T.sub.l(C.sub.K) of the average composition C.sub.K of the core volume.