A method of performing overlay welding on a member including a steel material and an overlay welded portion made of a cobalt-based alloy and formed on the steel material, the method including generating an arc between a welding torch and the overlay welded portion, forming a melt pool by melting a surface of the overlay welded portion with the arc, and simultaneously inserting a similar-composition welding material having a composition similar to the steel material and a cobalt-based alloy welding material made of a cobalt-based alloy into the melt pool.

Systems and methods for low-manganese welding alloys are disclosed. An example arc welding consumable may comprise: between 0.4 and 1.0 wt % manganese; strengthening agents selected from the group consisting of nickel, cobalt, copper, carbon, molybdenum, chromium, vanadium, silicon, and boron; and grain control agents selected from the group consisting of niobium, tantalum, titanium, zirconium, and boron. The grain control agents may comprise greater than 0.06 wt % and less than 0.6 wt % of the welding consumable. The resulting weld deposit may comprise a tensile strength greater than or equal to 70 ksi, a yield strength greater than or equal to 58 ksi, a ductility (as measured by percent elongation) of at least 22%, and a Charpy V-notch toughness greater than or equal to 20 ft-lbs at ?20? F. The welding consumable may provide a manganese fume generation rate less than 0.01 grams per minute during the arc welding operation.

Systems and methods for low-manganese welding alloys are disclosed. An example arc welding consumable may comprise: between 0.4 and 1.0 wt % manganese; strengthening agents selected from the group consisting of nickel, cobalt, copper, carbon, molybdenum, chromium, vanadium, silicon, and boron; and grain control agents selected from the group consisting of niobium, tantalum, titanium, zirconium, and boron. The grain control agents may comprise greater than 0.06 wt % and less than 0.6 wt % of the welding consumable. The resulting weld deposit may comprise a tensile strength greater than or equal to 70 ksi, a yield strength greater than or equal to 58 ksi, a ductility (as measured by percent elongation) of at least 22%, and a Charpy V-notch toughness greater than or equal to 20 ft-lbs at ?20? F. The welding consumable may provide a manganese fume generation rate less than 0.01 grams per minute during the arc welding operation.

Disclosed herein are embodiments of wear resistant alloys, such as ferrous alloys, that can have reduced carbide contents. In some embodiments, the alloys may have no carbides. In some, the alloy may have boride phases, such as phases having high Mo+W content and/or high Fe+Cr content. There can be reduced hardphases levels out of the specifically disclosed boride phases in some embodiments. In some embodiments, hypereutectic chromium borides can have limited incorporation into the disclosed alloys.

A method of cleaning a workpiece after a welding process is provided, wherein the cleaning is conducted by removing oxide from the surface of the workpiece which is formed on the weld and the heat-affected zone of the workpiece during the previous welding process, wherein an electric arc is generated between the workpiece and a non-consumable electrode to remove the oxide on the workpiece, wherein a power source is provided to electrically communicate the workpiece and the non-consumable electrode and wherein the non-consumable electrode is anodic connected and the workpiece is cathodic connected.

Welding material for welding of superalloys comprising boron with the range of 0.3-0.8 wt. % B, 0.2-0.8 wt. % C, 17-23 wt. % Cr, 0.35-10 wt. % Mo, 0.1-4.15 wt. % Nb with nickel or iron and impurities to balance for weld repair of engine components manufactured of precipitation hardening superalloys with high content of gamma prime phase at an ambient temperature.

Embodiments of an alloy that can be resistant to cracking. In some embodiments, the alloy can be advantageous for use as a hardfacing alloys, in both a diluted and undiluted state. Certain microstructural, thermodynamic, and performance criteria can be met by embodiments of the alloys that may make them advantageous for hardfacing.

A method for assembling at least one rolling support and guide element with a complementary part by direct flash welding includes the step of a first step carried out by a first flashing phase intended to increase the temperature of the surfaces to be welded in a homogeneous manner, the duration of this first step being between 15 s and 40 s. A second step is carried out by a phase of preheating by Joule effect of the parts to be welded, the duration of this second step being between 45 s and 55 s with a heating current of between 55 kA and 70 kA. A third step is carried out by a second flashing phase to deoxidize the faces to be welded while avoiding their re-oxidation, the duration of this third step being between 12 s and 22 s and with a flashing current of between 16 kA and 19 kA. A step is included bringing the surfaces to be welded into contact.

It is an object to provide a stainless steel flux-cored wire in which the amount of hexavalent chromium in fume can be reduced while maintaining the weldability excellent. The stainless steel flux-cored wire contains, as percentage to the total mass of the wire: Cr: 11-30 mass %; metal Si, Si oxide and Si compound: 0.5-4.0 mass % in total in terms of Si [Si]; fluorine compound: 0.01-1.0 mass % in terms of F [F]; TiO.sub.2: 1.5 mass % or above; ZrO.sub.2+Al.sub.2O.sub.3: 3.2 mass % or below; Na compound, K compound and Li compound: 0.50 mass % or below in total of each of an amount in terms of Na [Na], an amount in terms of K [K] and an amount in terms of Li [Li]; and satisfies {([Na]+[K]+[Li])[Cr].sup.2}/([Si]+4.7[F])10, where [Cr] represents Cr content.

An injection-molded solder (IMS) tool assembly apparatus, the apparatus including an IMS tool for dispensing a molten material via a round extrusion part to coat an inside or an outside wall of a pipe (and a chiller for providing cooling water to flow through an inside of the pipe.)