A torch for performing TIG welding is disclosed. In accordance with at least one embodiment of the present invention, the torch includes a torch body having a cavity configured to receive and support an electrode assembly, a first shield gas channel, and a second shield gas channel. The first shield gas channel extends from an external surface of the torch body to a first plenum that is fluidly coupled to the cavity so that the first shield gas channel is configured to direct a first shield gas into the cavity. The first plenum is defined, at least in part, by the cavity and is disposed radially exterior of a portion of the electrode assembly. The second shield gas channel is configured to direct a second shield gas to exit the torch body along a path that that is radially exterior of the cavity.

The present application relates to a gas control system and method for a reflow soldering furnace, comprising: an oxygen detecting device, capable of coming into contact with a gas in a furnace chamber, for detecting an oxygen concentration in the furnace chamber; an intake valve device, for controllably establishing fluid communication between a working gas source and the furnace chamber, thereby inputting the working gas into the furnace chamber; and a controller, for controlling the opening extent of at least one intake valve device based on an oxygen concentration signal, thereby regulating a flow rate of the working gas inputted into the furnace chamber. With a gas control system and method according to the present application, an oxygen concentration in a furnace chamber is detected in real time, and a gas control valve is automatically regulated on the basis of a predetermined set value or target value to control input of a working gas, achieving precise control and fast regulation; in addition, when work is stopped or during work intermissions, a gas control valve can be closed in a timely manner, thereby preventing waste and reducing costs.

A solid wire according to an aspect of the present invention contains, as a chemical composition: C: 0.003% to 0.080%; Si: 0.0010% to 0.50%; Mn: 0.050% to 1.80%; Al: 0.030% to 0.500%; Ni: 8.0% to 16.0%; P: 0.0200% or less; S: 0.0100% or less; O: 0.050% or less; Ta: 0% to 0.1000%; Cu: 0% to 0.5%; Cr: 0% to 0.5%; Mo: 0% to 0.5%; V: 0% to 0.20%; Ti: 0% to 0.10%; Nb: 0% to 0.10%; B: 0% to 0.010%; Mg: 0% to 0.80%; REM: 0% to 0.050%; and a remainder: Fe and impurities, a is 1.35% to 5.50%, and Ceq is 0.250% to 0.520%.

The invention relates generally to welding and, more specifically, to welding wires for arc welding, such as Gas Metal Arc Welding (GMAW) or Flux Core Arc Welding (FACW). In one embodiment, a tubular welding wire includes a sheath and a core, and the core comprises a rare earth silicide component (cerium, lanthanum, or a combination thereof). The core may also comprise an organic stabilizer component, a carbon component, and an agglomerate. The organic stabilizer component may comprise an organic molecule or organic polymer bound to one or more Group I or Group II metals. The carbon component may comprise graphite, graphene, carbon black, lamp black, carbon nanotubes, diamond, or a combination thereof. The agglomerate may comprise oxides of one or more Group I or Group II metals, titanium, and manganese.

The invention relates generally to welding and, more specifically, to welding wires for arc welding, such as Gas Metal Arc Welding (GMAW) or Flux Core Arc Welding (FACW). In one embodiment, a tubular welding wire includes a sheath and a core, and the core comprises a rare earth silicide component (cerium, lanthanum, or a combination thereof). The core may also comprise an organic stabilizer component, a carbon component, and an agglomerate. The organic stabilizer component may comprise an organic molecule or organic polymer bound to one or more Group I or Group II metals. The carbon component may comprise graphite, graphene, carbon black, lamp black, carbon nanotubes, diamond, or a combination thereof. The agglomerate may comprise oxides of one or more Group I or Group II metals, titanium, and manganese.

A method of manufacturing a welded structure includes a preparation operation of arranging a first member to overlap a second member; a first welding operation of forming a first welding line on a first surface of the first member by welding a portion at which the first member overlaps the second member, the first surface of the first member being a surface of the first member facing the second member; a second welding operation of forming a second welding line on a second surface of the first member by welding the portion at which the first member overlaps the second member, the second surface of the first member being a surface opposite to the first surface; and connecting the first welding line to the second welding line.

A method of manufacturing a welded structure includes a preparation operation of arranging a first member to overlap a second member; a first welding operation of forming a first welding line on a first surface of the first member by welding a portion at which the first member overlaps the second member, the first surface of the first member being a surface of the first member facing the second member; a second welding operation of forming a second welding line on a second surface of the first member by welding the portion at which the first member overlaps the second member, the second surface of the first member being a surface opposite to the first surface; and connecting the first welding line to the second welding line.

A portable jobsite skid system, including a skid-mounted enclosure made of formed sheet and structural metal, comprising a roof, side panels, and two doors, a first microbulk vessel containing a first pressurized gas, and a second microbulk vessel containing a second pressurized gas, a gas mixer configured to mix the first pressurized gas and the second pressurized gas, and quick disconnect ports configured to connect a gas mixture to the end user. The system may include between two and four doors. The system may include at least one self-contained welding machine, and a means for providing the pressurized gas to the self-contained welding machine.

An aluminum alloy brazing sheet is formed of a four-layer material formed of a brazing material, an intermediate material, a core material, and a brazing material. The intermediate material comprises Mg of 0.40 to 6.00 mass %, and has a total of contents of Mn, Cr, and Zr being 0.10 mass % or more. The core material comprises Mg of 0.20 to 2.00 mass % and comprises one or two or more of Mn of 1.80 mass % or less, Si of 1.05 mass % or less, Fe of 1.00 mass % or less, Cu of 1.20 mass % or less, Ti of 0.30 mass % or less, Zr of 0.30 mass % or less, and Cr of 0.30 mass % or less. Each of the core material and the intermediate material has a grain size of 20 to 300 μm.

Properties and performance of weld material between metals in a weldment is controlled by modifying one or more of the nitrogen content and the carbon content to produce carbide (e.g. MC-type), nitride and/or complex carbide/nitride (e.g. MX-type) type precipitates. Fusion welding includes (i) adjusting shield gas composition to increase nitrogen/carbon gas and nitride/carbide species, (ii) adjusting composition of nitrogen/carbon in materials that participate in molten welding processes, (iii) direct addition of nitrides/carbides (e.g. powder form), controlled addition of nitride/carbide forming elements (e.g. Ti, Al), or addition of elements that increase/impede solubility of nitrogen/carbon or nitride/carbide promoting elements (e.g. Mn), and (iv) other processes, such as use of fluxes and additive materials. Weld materials have improved resistance to different cracking mechanisms (e.g., hot cracking mechanisms and solid state cracking mechanisms) and improved tensile related mechanical properties.