Systems and methods for low-manganese welding alloys are disclosed. An example arc welding consumable that forms a weld deposit on a steel workpiece during an arc welding operation, wherein the welding consumable comprises: less than 0.4 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, wherein the grain control agents comprise greater than 0.06 wt % and less than 0.6 wt % of the welding consumable, wherein the weld deposit comprises 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, that is at least 22%, and a Charpy V-notch toughness greater than or equal to 20 ft-lbs at ?20? F., and wherein the welding consumable provides a manganese fume generation rate less than 0.01 grams per minute during the arc welding operation.

The present invention is a weld metal formed by gas shielded arc welding using a flux cored wire, the welded metal having a predetermined chemical composition, residual austenite particles being present in an amount of at least 2500 particles/mm.sup.2, and the volume fraction of residual austenite particles being at least 4.0%.

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.

An iron-based braze filler alloy consists of from 9 wt % to 30 wt % Cr; from 5 wt % to 25 wt % Ni; from 0.5 wt % to 9 wt % Mo; from 1 wt % to 5 wt % Mn; from 0 wt % to 1 wt % N; from 6 wt % to 20 wt % Si; from 0.1 wt % to 15 wt % P; and is balanced with Fe.

The present disclosure relates generally to welding alloys and, more specifically, to welding consumables (e.g., welding wires and rods) for welding, such as Gas Metal Arc Welding (GMAW), Gas Tungsten Arc Welding (GTAW), Shielded Metal Arc Welding (SMAW), and Flux Core Arc Welding (FCAW). In an embodiment, a welding alloy includes less than approximately 1 wt % manganese as well as one or more strengthening agents selected from the group: nickel, cobalt, copper, carbon, molybdenum, chromium, vanadium, silicon, and boron. Additionally, the welding alloy has a carbon equivalence (CE) value that is less than approximately 0.23, according to the Ito and Bessyo carbon equivalence equation. The welding alloy also includes one or more grain control agents selected from the group: niobium, tantalum, titanium, zirconium, and boron, wherein the welding alloy includes less than approximately 0.6 wt % grain control agents.

A method for laser welding one or more workpieces made of press-hardenable steel in a butt joint, wherein the workpiece or workpieces have a thickness of between 0.5 and 1.8 mm, and/or a jump in thickness of between 0.2 and 0.4 mm occurs at the butt joint, and wherein laser welding is carried out with the feed of filler wire into the molten bath, which is generated only by at least one laser beam. The filler wire contains at least one alloy element from the group comprising manganese, chromium, molybdenum, silicon and/or nickel, which alloy element promotes the formation of austenite in the molten bath generated by the laser beam, wherein said at least one alloy element is present in the filler wire in a mass percentage greater by at least 0.1 wt. % than in the steel of the workpiece or workpieces and the workpiece or workpieces used are non-coated or the coating thereof is partially removed.

An automobile undercarriage part of the present invention has a welded joint formed by base steel plate, wherein the chemical composition of a weld metal contains, with respect to a total mass of the weld metal, by mass %, C: 0.02% to 0.30%, Si: 0.10% to less than 1.0%, Mn: 1.2% to 3.0%, Al: 0.002% to 0.30%, Ti: 0.005% to 0.30%, P: more than 0% to 0.015%, and S: more than 0% to 0.030%, the following formula (1A), formula (1B), formula (2), and formula (3) are satisfied, and slag in a toe portion of the fillet weld satisfies a formula (4).
[Al]+[Ti]>0.05Formula (1A)
[Ti]/[Al]>0.9Formula(1B)
7[Si]+7[Mn]112[Ti]30[Al]12Formula (2)
2.0<[Si]+[Mn]Formula (3)
[Ti content on slag surface]>[Si content on slag surface]Formula (4).

The present invention relates to an impeller manufacturing method in which a thermal cycle is performed on an assembly body with a brazing material formed of a Ni-containing Au alloy being placed at a bond portion of at least two impeller constituent members. The thermal cycle includes a temperature increasing process with a temperature increasing rate of 20 C./hr. to 100 C./hr., the process including a first intermediate retention and a second intermediate retention each keeping the temperature, the first intermediate retention performed in a temperature range of 500 C. to 850 C. and the second intermediate retention performed in a temperature range of 850 C. to 950 C. (but not including 850 C.). In the thermal cycle, the temperature is increased in a temperature range exceeding 950 C. after the second intermediate retention at a rate lower than that before the second intermediate retention.

Methods for welding a particle-matrix composite body to another body and repairing particle-matrix composite bodies are disclosed. Additionally, earth-boring tools having a joint that includes an overlapping root portion and a weld groove having a face portion with a first bevel portion and a second bevel portion are disclosed. In some embodiments, a particle-matrix bit body of an earth-boring tool may be repaired by removing a damaged portion, heating the particle-matrix composite bit body, and forming a built-up metallic structure thereon. In other embodiments, a particle-matrix composite body may be welded to a metallic body by forming a joint, heating the particle-matrix composite body, melting a metallic filler material forming a weld bead and cooling the welded particle-matrix composite body, metallic filler material and metallic body at a controlled rate.

An iron-based braze filler alloy consists of from 9 wt % to 30 wt % Cr; from 5 wt % to 25 wt % Ni; from 0.5 wt % to 9 wt % Mo; from 1 wt % to 5 wt % Mn; from 0 wt % to 1 wt % N; from 6 wt % to 20 wt % Si; from 0.1 wt % to 15 wt % P; and is balanced with Fe.