Disclosed herein are a copper-alloy stainless pipe, an air conditioner including the same and a method of manufacturing the same. A copper-alloy stainless pipe includes a recrystallization layer forming an interface between a pipe base material and a copper plating layer, thereby increasing bonding force between the pipe base material and the copper plating layer. Accordingly, it is possible to prevent the copper plating layer from being peeled off and to increase corrosion resistance of the pipe. The recrystallization layer may be composed of intermetallic compound.

The method includes a step of preparing a first member made of a first metal and a second member made of a second metal having a smaller deformation resistance than the first metal, and a step of joining the first member and the second member. The step of joining includes a step of heating the first member and the second member by relatively rotating the first member and the second member, while pressing the first member and the second member against each other, without changing a relative positional relationship therebetween, and a step of cooling the first member and the second member heated, while being pressed against each other. In a first contact surface which is a surface of the first member coming into contact with the second member, a recess is formed so as to include a region intersecting the axis of rotation.

A method for joining materials using additive friction stir techniques is provided. The method joins a material to a substrate, especially where the material to be joined and the substrate are dissimilar metals. One such method comprises (a) providing a substrate with one or more grooves; (b) rotating and translating an additive friction-stir tool relative to the substrate; (c) feeding a filler material through the additive friction-stir tool; and (d) depositing the filler material into the one or more grooves of the substrate. Translation and rotation of the tool causes heating and plastic deformation of the filler material, which flows into the grooves of the substrate resulting in an interlocking bond between the substrate and filler material. In embodiments, the depositing of the filler material causes deformation of the grooves in the substrate and an interlocking configuration between the grooves of the substrate and the filler material results.

The method for producing a metal member includes a step of preparing a first member made of a first metal, a second member made of a second metal, and a third member made of a third metal, and a step of joining the first member and the second member via the third member. The step of joining includes a step of heating the first member, the second member, and the third member by stacking the first member, the third member, and the second member in this order and relatively rotating the first member about an axis of rotation, while pressing the first member against the third member, without changing a positional relationship, and a step of cooling the first member, the second member, and the third member heated, with the members being in the stacked state.

A method of attaching a first metal object to a second metal object is presented. The first metal object and the second metal object are dissimilar materials. The first metal object comprises an upper surface and a lower surface. The method comprises: positioning the first metal object in intimate contact with the second metal object such that the second metal object is in contact with the lower surface of the first metal object; identifying at least one attachment location on the upper surface of the first metal object where the first metal object is in intimate contact with the second metal object; adding a powdered metal on the upper surface of the first metal object at the at least one attachment location; and firing a heat source at the powdered metal to melt the powdered metal and drive the melted powdered metal through the first metal object and into the second metal object.

This invention provides a metal laminate that maintains functionality such as radiation performance and is excellent in dimensional accuracy after press work. Such metal laminate is a roll-bonded laminate composed of 2 or more metal layers, which exhibits a ratio /T of the standard deviation of thickness T.sub.1 of the outermost layer to thickness T of the roll-bonded laminate of 0% of 4.0%, the thickness T of 2 mm or less, and the deviation of the thickness T of 4.0% or less.

A workpiece is described, and includes a substrate, a cable, and a cover piece. A portion of the cable is joined to the substrate employing a vibration welding tool, and the cover piece is interposed between the portion of the cable and the vibration welding tool during the joining.

Solid-state joining of preformed features, such as bosses, flanges, gaskets, centralizers and other features to substrates or cast parts by a solid-state additive manufacturing process is disclosed. Joining can be between same or different materials using same, similar or dissimilar filler material than the materials of the feature and the part that need to be joined.

A method for manufacturing an electrical conductor, such as a current rod, comprising the following successive steps: providing a core made of a first metallic material, providing a sheath made of a second metallic material, the sheath being intended to cover a first part of the core, providing a connection terminal made of a third metallic material, assembling the core and the connection terminal, by crimping, or by crimping and brazing, or by braze welding, or by brazing, assembling the core and the connection terminal with the sheath.

A solder alloy for joining a Cu pipe and/or a Fe pipe has an alloy composition comprising in mass %: Sb: 5.0% to 15.0%; Cu: 0.5% to 8.0%; Ni: 0.025% to 0.7%; and Co: 0.025% to 0.3%, with a balance being Sn. The alloy composition satisfies the relationship of 0.07Co/Ni6, where Co and Ni represent contents of Co and Ni in mass %, respectively.