Abstract: An aluminum alloy heat exchanger is produced by applying a coating material that is prepared by adding a binder to a mixture of an Si powder and a Zn-containing compound flux powder to a surface of an aluminum alloy refrigerant tube, assembling a bare fin that is formed of an Al—Mn—Zn alloy with the refrigerant tube, and brazing the refrigerant tube and the bare fin by heating in an atmosphere-controlled furnace, the refrigerant tube being an extruded product of an aluminum alloy that comprises 0.5 to 1.7% (mass %, hereinafter the same) of Mn, less than 0.10% of Cu, and less than 0.10% of Si, with the balance being Al and unavoidable impurities.

Abstract: An aluminum alloy sheet that exhibits excellent surface quality after anodizing, includes a peritectic element that undergoes a peritectic reaction with at least aluminum, and requires an anodic oxide coating is characterized in that the concentration of the peritectic element in a solid-solution state that is present in the outermost surface area of the aluminum alloy sheet varies in the widthwise direction of the aluminum alloy sheet in the form of a band having a width of 0.05 mm or less, and the difference in the concentration of the peritectic element between adjacent bands is 0.008 mass % or less.

Abstract: A method of joining heat-treatable aluminum alloy members by friction stir welding, including the steps of: a T4-treatment-performing step of performing a T4 treatment on heat-treatable aluminum alloy members so as to impart T4 temper to the heat-treatable aluminum alloy members; a joining step of joining the heat-treatable aluminum alloy members with T4 temper by friction stir welding to provide a joined product; and a reversion-treatment-performing step of performing a reversion treatment, the reversion-treatment-performing step being carried out prior to or after the joining step.

Abstract: An aluminum alloy heat exchanger is produced by applying a coating material that is prepared by adding a binder to a mixture of an Si powder and a Zn-containing compound flux powder to a surface of an aluminum alloy refrigerant tube, assembling a bare fin that is formed of an Al—Mn—Zn alloy with the refrigerant tube, and brazing the refrigerant tube and the bare fin by heating in an atmosphere-controlled furnace, the refrigerant tube being an extruded product of an aluminum alloy that comprises 0.5 to 1.7% (mass %, hereinafter the same) of Mn, less than 0.10% of Cu, and less than 0.

Abstract: A method for producing an aluminum alloy heat exchanger includes applying a coating material prepared by mixing an Si powder, a flux powder, and a binder to a surface of a multiport flat refrigerant tube, assembling an aluminum alloy bare fin with the multiport flat refrigerant tube, and brazing the multiport flat refrigerant tube and the aluminum alloy bare fin to obtain an aluminum alloy heat exchanger, the multiport flat refrigerant tube being formed of an aluminum alloy extruded material that includes 0.5 to 1.7 mass % of Mn, less than 0.10 mass % of Si, and less than 0.

Abstract: Within an area of substantially regular hexagons arranged at regular intervals on an imaginary reference plane, a sheet material includes a concave-convex section (20) having a basic pattern in which one first region (A1) is surrounded by six second regions (A2). This basic pattern repeats in regular intervals in lateral and longitudinal directions of the sheet material. The concave-convex section includes first protruding portions (21) and second protruding portion (22), which protrude in opposite directions from each other in the thickness direction in the first regions and the second regions, respectively. The first and second protruding portions may have a hexagonal pyramidal shape or a truncated hexagonal pyramidal shape.

Abstract: A sheet material (1) includes a stiffness-increasing concave-convex part (20). A first reference plane (K1), an intermediate reference plane (K3), and a second reference plane (K2) serve as a reference system. The intermediate reference plane is partitioned by first lattice straight lines (L1), second lattice straight lines (L2), and third lattice straight lines (L3) so as to define hexagonal unit areas (24) and triangular unit areas (25) in the intermediate reference plane. Areas that include a plurality of the hexagonal unit areas and the triangular unit areas are designated as first, second and third reference areas (214, 224, 234), respectively. Combinations thereof constitute new first, second and third reference areas (213, 223, 233), respectively. The concave-convex part includes first areas (21) and second areas (22), which respectively include the new first reference areas and the new second reference areas, and third areas (23), which include the new third reference areas.

Abstract: An aluminum alloy material is welded by performing friction stir welding to form a welded section in an aluminum alloy welded component. The aluminum alloy material contains Mg: 0.3-6.0% (mass %, hereinafter the same), Cu: 0.2% or less, Si: 0.1% or less, Fe: 0.1% or less, the balance being Al and inevitable impurities. Second phase particles dispersed in the aluminum alloy material have a grain size of 5 ?m or less as observed with an optical microscopic. Because the second phase particles are homogeneously dispersed in a welded section equivalent portion of the aluminum alloy welded component as compared to other portions, variations in pit formation caused by etching during anodizing are reduced, thereby eliminating color tone variations in the anodized coating formed on the aluminum alloy welded component.

Abstract: An aluminum alloy clad sheet for heat exchangers includes a core material, a cladding material 1, and a cladding material 2, one side and the other side of the core material being respectively clad with the cladding material 1 and the cladding material 2, the core material containing 0.5 to 1.2% of Si, 0.2 to 1.0% of Cu, 1.0 to 1.8% of Mn, and 0.05 to 0.3% of Ti, with the balance being Al and unavoidable impurities, the cladding material 1 containing 3 to 6% of Si, 2 to 8% of Zn, and at least one of 0.3 to 1.8% of Mn and 0.05 to 0.3% of Ti, with the balance being Al and unavoidable impurities, and the cladding material 2 containing 6 to 13% of Si, with the balance being Al and unavoidable impurities, the cladding material 1 serving as the outer side of the aluminum alloy clad sheet during use.

Abstract: An aluminum sheet material for lithographic printing plates wherein the number of aluminum carbide particles having a circle equivalent diameter, measured by the PoDFA method, of 3 ?m or more is four or less, the number of aluminum carbide particles having a circle equivalent diameter, measured by the PoDFA method, of 3 ?m or more.

Abstract: A MIG welded joint between aluminum and steel members is obtained by overlapping the aluminum member and the steel member each other and performing MIG welding using a filler wire made of a 4000 or 5000 series aluminum alloy on an end face of the overlapped aluminum member, wherein the aluminum member has a thickness P ranging from 0.5 to 2.0 mm, and the steel member has a thickness Q satisfying the following formula: 0.6?Q/P?0.8.

Abstract: A raised and recessed sheet material having extremely high stiffness, and useful vehicle panel and laminated structure using the same. The surface of the sheet is formed by a plurality of squares arranged in two mutually perpendicular directions, and has a raised and recessed pattern. A basic configuration A, where first regions M and a Z-shaped second region N are formed in the square, and basic configurations B to D derived from the basic configuration A are butted together at their peripheral edges such that first regions M having those peripheral edges are butted together and the second regions N having those peripheral edges are butted together. The raised and recessed pattern is formed by upwardly raising the first regions M and downwardly recessing the second regions N, or upwardly raising or downwardly recessing either one or both of the first and second regions M and N.

Abstract: A high-strength aluminum alloy extruded material contains Si: 0.70 to 1.3 mass %; Mg: 0.45 to 1.2 mass %; Cu: 0.15 to less than 0.40 mass %; Mn: 0.10 to 0.40 mass %; Cr: more than 0 to 0.06 mass %; Zr: 0.05 to 0.20 mass %; Ti: 0.005 to 0.15 mass %, Fe: 0.30 mass % or less; V: 0.01 mass % or less; the balance being Al and unavoidable impurities Crystallized products in the alloy have a particle diameter of a is 5 ?m or less. Furthermore, an area ratio of a fibrous structure in a cross section parallel to an extruding direction during hot extrusion is 95% or more.

Abstract: First and second aluminum alloy materials (2, 3), each comprised of a 5000-series aluminum alloy containing second phase particles having a diameter less than 5 ?m in a distribution density of less than or equal to 10,000 second phase particles/mm2, are welded together by abutting portions of the first and second aluminum alloy materials, and friction stir welding along the abutted portions (5) to form an integrally-welded aluminum alloy panel (1). The friction stir welding is performed using a tool (8) having a shoulder (10) under the following conditions: (i) the shoulder of the tool has a diameter (d) in the range of 3 mm?d?8 mm and (ii) the revolution number (r) of the tool is 6<r?20, wherein r is tool revolutions/length of the weld (4) in millimeters.

Abstract: A sheet material (1) includes a stiffness-increasing concave-convex part (20). A first reference plane (K1), an intermediate reference plane (K3), and a second reference plane (K2) serve as a reference system. First unit areas (241) and second unit areas (242) are defined in the intermediate reference plane (K3). Each of the first unit areas (241) and the second unit areas (242) contains first virtual squares (243) and second virtual squares (244). Icosagonal areas that contain only adjacent first virtual squares (243) are designated as first reference areas (213), and icosagonal areas that contain only adjacent second virtual squares (244) are designated as second reference areas (223). The concave-convex part (20) contains first areas (21), which are formed based on the first reference areas (213), as well as second areas (22) and/or plane areas (23), which are formed based on the second reference areas (223).

Abstract: A sheet material (1) includes a stiffness-increasing concave-convex part (20). A first reference plane (K1) and a second reference plane (K2) serve as a reference system. Numerous at least substantially (H) shaped first reference areas (213), each including two parallel longitudinal bar parts (214) and a latitudinal bar part (215) that connects center portions the two parallel longitudinal bar parts together, are arrayed with the same orientation in the second reference plane (K2). First areas (21) respectively protrude from the first reference areas (213) in the second reference plane (K2) toward the first reference plane (K1). Each first area (21) includes a first top surface (211), which is a reduced projection of its first reference area (213) into the first reference plane (K1), and first side surfaces (212) that connect the outer periphery of the first top surface (211) with the outer periphery of the corresponding first reference area (213).

Abstract: A sheet material (1) includes a stiffness-increasing concave-convex part (20). A first reference plane (K1), an intermediate reference plane (K3), and a second reference plane (K2) serve as a reference system. First reference areas (213), which have a specific shape, and second reference areas (223), which are all areas other than the first reference areas (213), are disposed in the intermediate reference plane (K3). The concave-convex part (20) is formed of first areas (21) as well as second areas (22) and/or plane areas (23).

Abstract: A double pipe for a heat exchanger includes an inner pipe having a plurality of spiral projections extending radially outward from an outer peripheral surface of the inner pipe. An outer pipe is disposed around the inner pipe. At least an inner peripheral surface of the outer pipe is at least substantially smooth and has an at least substantially circular cross section. The inner peripheral surface of the outer pipe contacts all of the projections of the inner pipe so as to define a plurality of peripherally-separated, outer flow paths between the inner pipe and the outer pipe. Fluid flowing within an inner flow path defined by the inner pipe exchanges heat with fluid flowing through the outer flow paths. Furthermore, an inscribed circle of the inner pipe has a first diameter (d1), an inscribed circle of the outer pipe has a second diameter (d2), and 0.6<d1/d2.

Abstract: A sheet material (1) includes a stiffness-increasing concave-convex part (20). A first reference plane (K1), an intermediate reference plane (K3), and a second reference plane (K2) serve as a reference system. The intermediate reference plane is partitioned by first lattice straight lines (L1), second lattice straight lines (L2), and third lattice straight lines (L3) so as to define hexagonal unit areas (24) and triangular unit areas (25) in the intermediate reference plane. Areas that include a plurality of the hexagonal unit areas and the triangular unit areas are designated as first, second and third reference areas (214, 224, 234), respectively. Combinations thereof constitute new first, second and third reference areas (213, 223, 233), respectively. The concave-convex part includes first areas (21) and second areas (22), which respectively include the new first reference areas and the new second reference areas, and third areas (23), which include the new third reference areas.

Abstract: A plate-like conductor for a busbar, which is a clad member consisting of two copper layers derived from respective two copper plates clad on respective opposite major surfaces of an aluminum plate, an aluminum layer derived from the aluminum plate and formed integrally with the copper layers, and two alloy layers consisting of aluminum and copper and formed between the aluminum layer and the two copper layers.