An aluminum alloy brazing sheet used for brazing in an inert gas atmosphere without using flux includes a core material of aluminum or aluminum alloy, and a brazing material of aluminum alloy including Si of 4.0 mass % to 13.0 mass % and cladding one side surface or both side surfaces of the core material. One or both of the core material and the brazing material includes any one or two or more types of X atoms (X is Mg, Li, Be, Ca, Ce, La, Y, and Zr). The aluminum alloy brazing sheet is a brazing sheet in which oxide particles including the X atoms and having a volume change ratio of 0.99 or lower with respect to an oxide film before brazing heating are formed on a surface thereof, by brazing heating.

An electrode wire for use in an electrical discharge machining apparatus includes a metallic core and a layer of gamma phase brass disposed over the metallic core. Particles of beta phase brass are interspersed within the gamma phase brass layer. An oxide layer including zinc is disposed over the gamma phase brass layer.

Aluminum-zinc-magnesium-zirconium base alloys and aluminum-zinc-magnesium-copper-zirconium base alloys that exhibit ultra-high strength and superior weldability, and methods of fabricating them.

A filler wire may include a rod including an aluminum-silicon (Al—Si) alloy powder and a fluoride flux powder, and a sheath including zinc (Zn) alloy and surrounding the rod.

A device for imparting a torsional force onto a wire has a base and a support mounted so as to be rotatable with respect to the base around an axis of rotation. The axis of rotation coincides with a wire path extending through the base and the support. Further, a wire clutching device is mounted on the support and adapted to engage at a wire guided along the wire path, and a rotation mechanism is provided which is adapted for rotating the support with respect to the base.

An aluminum alloy brazing sheet, a manufacturing method therefor, and a manufacturing method for an automotive heat exchanger. The aluminum alloy brazing sheet includes an aluminum alloy core material, a first brazing material that is clad to one surface of the core material, and a second brazing material that is clad to the other surface of the core material. The core material, the first brazing material, and the second brazing material each include a respective prescribed aluminum alloy. A count of an Al—Si—Fe intermetallic compound having an equivalent circle diameter of 0.5 to 80.0 μm in the second brazing material is less than or equal to 2,000 particles per mm.sup.2.

The present invention relates to a process for the production of an aluminium multilayer brazing sheet which comprises a core layer made of a 3xxx alloy comprising 0.1 to 0.25 wt. % Mg, a brazing layer made of a 4xxx alloy on one or both sides of the core layer, and optionally an interlayer between the core layer and the brazing layer on one or both sides of the core layer, the process comprising the successive steps of: providing the layers to be assembled or simultaneous casting of the layers to obtain a sandwich; rolling of the resulting sandwich to obtain a sheet; and treating the surface of the sheet with an alkaline or acidic etchant.

The present invention relates to a process for the production of an aluminium multilayer brazing sheet which comprises a core layer made of a 3xxx alloy comprising 0.1 to 0.25 wt. % Mg, a brazing layer made of a 4xxx alloy on one or both sides of the core layer, and optionally an interlayer between the core layer and the brazing layer on one or both sides of the core layer, the process comprising the successive steps of: providing the layers to be assembled or simultaneous casting of the layers to obtain a sandwich; rolling of the resulting sandwich to obtain a sheet; and treating the surface of the sheet with an alkaline or acidic etchant.

The disclosed apparatus, systems and methods relate to the design principles for forming a welded joint between two sections of tubing or pipe. The material at the end portion of a first section of tubing to is folded inwardly to create a support surface. This support surface improves the ability to weld light gage material with traditional arc welding and it creates conditions to allow brazing to be as strong as traditional arc welding by using A shaped piece of filler material which is located at the intersection between the support surface of the first section of tubing and a side wall section of the second section of tubing. While holding together the first and second sections of tubing with the filler material, heat is applied at the intersection at a temperature and for a duration sufficient to melt the filler material and form the 3t joint.

A brazing material for brazing aluminum or an aluminum alloy includes fluoride-based flux, a solidifying agent, and an organic viscosity reducing agent and is solid at 25° C.