Provided is a covered electrode for high-Cr ferritic heat-resistant steels with which it is possible to obtain weld metal that has the toughness required for weld parts and has excellent high temperature strength. The covered electrode for high-Cr ferritic heat-resistant steels includes a steel core and a coating agent that coats the core. The covered electrode comprises C, Si, Mn, Ni, Cr, Mo, V, Co, B, Nb, W, N, and Fe each in a predetermined range in the total mass of the covered electrode, contains a slag forming agent, and has a total of the W content and the Co content of 2.8 mass % or more.

A weld metal having the following composition: C: 0.040-0.100 wt.-% Mn: 0.450-0.900 wt.-% Si: 0.600-1.000 wt.-% S: 0.005-0.025 wt.-% B: 0.003-0.010 wt.-% Ti: 0.030-0.100 wt.-% and optionally: Ni: 0.000-0.500 wt.-% P: 0.000-0.020 wt.-% Cu, Cr, Nb, N, Mo, Al, W and V: 0.000-0.020 wt.-% each, the balance being iron and unavoidable impurities.

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.

A welding wire is disclosed including a ferrous metal welding material and a flux material including flux ingredients. The flux ingredients include, in weight percent based on the total weight of the welding wire: no greater than 1.91 aluminum, no greater than 1.02 manganese, less than 1.50 magnesium, and no greater than 0.02 rare earth metal oxide, where the rare earth metal oxide comprises at least 99 wt % cerium oxide based upon total weight of rare earth metal oxide. Resulting welds have a maximum diffusible hydrogen content of 5 mL/100 g or less. Resulting welds also have a Charpy V-notch toughness at 40 F. of at least 100 ft-lbs (135.6 Joules).

A tailored welded blank produced from at least two blank parts, where at least one is a press-hardenable manganese-boron steel and at least one has a coating of aluminum or an aluminum-based alloy. The parts are welded by laser-beam welding or hybrid laser/gas-metal-arc welding, while retaining the coating, using shielding gas and a filler wire having in % by weight: C: 0.41 to 0.9; Si: 0.4 to 4; Mn: 0.4 to 3; optionally Cr: 0 to 10; and with optional alloying of one or more of: Mo: 0.01 to 1.0; B: 0.0008 to 0.0040; Ti: 2.5B<=Ti<=5B; V: 0.01 to 0.4; Nb: 0.01 to 0.2; W: 0.01 to 0.2; the remainder Fe and unavoidable impurities. The high proportion of C and Cr or additionally or alternatively of Mo, V, Nb and/or W enables hardening by carbide formation in a weld-seam region after welding.

A welded joint 10 is a welded joint 10 in which a first steel sheet 1 and a second steel sheet 2 having a plating layer 4 at least on a part thereof are welded, Expression (1) is satisfied, where La is a length of a grain boundary at which an FeAl phase is present in grain boundaries and Lz is a length of a grain boundary at which an FeZn phase is present in the grain boundaries, and an area ratio of an MgZn phase in the plating layer 4 of a region from a starting point S to a position 1,000 m away from the starting point S is 5% or more.

[00001]$\begin{array}{cc}\mathrm{La}/\left(\mathrm{La}+\mathrm{Lz}\right)10020& \left(1\right)\end{array}$

An iron-based alloy composition including: boron (B): 1.6-2.4 wt. %; carbon (C): 1.7-3.0 wt. %; molybdenum (Mo): 16.0-19.5 wt. %; nickel (Ni): 3.5-6.5 wt. %; manganese (Mn): below 0.8 wt. %; silicon (Si): 0.2-3.0 wt. %; vanadium (V): 10.8-13.2 wt. %; and balanced with iron (Fe). Also, an item including a substrate portion and a hardfacing coating bonded to the substrate portion, wherein the hardfacing coating is made by an overlay welding process using the iron-based alloy composition.

An iron-based alloy composition including: boron (B): 1.6-2.4 wt. %; carbon (C): 2.2-3.0 wt. %; chromium (Cr): 3.5-5.0 wt. %; manganese (Mn): below 0.8 wt. %; molybdenum (Mo): 16.0-19.5 wt. %; nickel (Ni): 1.0-2.0 wt. %; silicon (Si): 0.2-2.0 wt. %; vanadium (V): 10.8-13.2 wt. %; and balanced with iron (Fe). Further, an item including a substrate portion and a hardfacing coating bonded to the substrate portion, wherein the hardfacing coating is made by an overlay welding process using the iron-based alloy composition.

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.