Kobe Steel, Ltd.

Denso Corporation

Kabushiki Kaisha Kobe Seiko Sho

Takahiro Izumi

Shimpei Kimura

Toshiki Ueda

Hayaki Teramoto

Yuji Shibuya

Michiyasu Yamamoto

Katsushi Matsumoto

Shoei Teshima

Akihiro Tsuruno

Osamu Hakamata

Nobuhiro Kobayashi

Koichi Sakamoto

Masao Kinefuchi

Shogo Yamada

Takahiro Shinoda

Haruyuki Konishi

Shingo Oono

Manabu Hasegawa

Motohiro Horiguchi

Kenichiro Yoshida

The present invention provides a brazing filler material in which the formation of coarse Si particles is suppressed, and a brazing sheet using the same. The brazing filler material includes Si: 3.5% by mass or more and 13.0% by mass or less, Ti: 0.001% by mass or more and 0.05% by mass or less, V: more than 0.0005% by mass and 0.05% by mass or less, and B: 0.001% by mass or less (excluding 0% by mass), with the balance being Al and inevitable impurities, and the value of V/Ti, which is a value obtained by dividing the V content (% by mass) by the Ti content (% by mass) is 0.05 or more and 5 or less.

Brazing filler material and brazing sheet

This brazed structure includes a brazing sheet that has been brazed and that comprises: a core material comprising an aluminum alloy which contains 0.3-1.0 mass %, excluding 0.3 mass %, Si, 0.6-2.0 mass %, excluding 0.6 mass %, Mn, 0.3-1.0 mass %, excluding 0.3 mass %, Cu, and 0.15-0.5 mass %, excluding 0.15 mass %, Mg, with the remainder comprising Al and unavoidable impurities, and has an average crystal grain diameter of 50 &#x3bc;m or larger and in which an Mg&#x2014;Si intermetallic compound and an Al&#x2014;Mg&#x2014;Si&#x2014;Cu intermetallic compound account for 40% or less of the grain boundaries; and, clad to the core material, a brazing material comprising an Al&#x2014;Si alloy.

Brazed structure

Provided is an aluminum alloy laminated plate having a sacrificial material cladded to at least one side surface of a core material, wherein the core material contains specified amounts of Mn, Si, Cu, Mg, Fe, and Ti, the balance is Al and inevitable impurities, the number density of dispersed particles having a particle size of 0.01-0.5 &#x3bc;m is 10-100/&#x3bc;m, and [(the total solid solution amount of Mg, Mn, Si, and Cu)/(the total added amount of Mg, Mn, Si, and Cu)] is 0.10 or more.

Aluminium alloy laminated plate

The present invention provides an aluminum alloy brazing sheet for electric resistance welding, which has high strength while being thinned and can reduce the occurrence of welding defects in the electric resistance welding. Disclosed is an aluminum alloy brazing sheet for electric resistance welding, including a core layer and a brazing filler layer cladded on at least one surface of the core layer, wherein the brazing filler layer is made of an aluminum alloy comprising Si: 5.5 to 12.0% by mass, and at least one of Na: 0.0003 to 0.0030% by mass and Sr: 0.0020 to 0.1000% by mass, with the balance being Al and inevitable impurities, wherein the brazing filler layer in a molten state at 650&#xb0; C. exhibits a viscosity of 0.01 Pa&#xb7;s or less.

Aluminum alloy brazing sheet for electric resistance welding

A brazing sheet formed of an aluminum alloy and exhibiting excellent post-brazing strength, corrosion resistance and brazability with a thickness of less than 200 &#x3bc;m is provided. The brazing sheet includes a core layer, a filler layer of an Al&#x2014;Si based alloy on one side of the core layer, and a sacrificial layer on the other side of the core layer. The core layer includes more than 1.5 mass % and 2.5 mass % or less of Cu, 0.5 mass % to 2.0 mass % of Mn, Al, and inevitable impurities. The sacrificial layer includes 2.0 mass % to 7.0 mass % of Zn, more than 0.10 mass % and 3.0 mass % or less of Mg, Al, and inevitable impurities. The filler layer and the sacrificial layer each have a thickness of 15 &#x3bc;m to 50 &#x3bc;m. A total clad rate of the filler layer and the sacrificial layer is equal to or less than 50%.

Brazing sheet formed of aluminum alloy

A brazing sheet includes a core material containing an aluminum alloy including magnesium, a bonding material laminated on at least one side of the core material, and a flux layer. The flux layer is laminated on one side of the bonding material and includes a flux composition. The flux composition includes [A] a flux component containing KAlF, and [B] AlF. A substance mass S1 (mol) of magnesium in the bonding material when heated at 585&#xb0; C., a substance mass S2 (mol) of [A] the flux component containing KAlFin the flux layer and a substance mass S3 (mol) of [B] AlFsatisfy the specific expression.

Brazing sheet and flux composition

Disclosed is a flux composition for use in brazing of an aluminum alloy material and includes a flux component [A] containing KAlF; and a fluoride [B] containing an element other than Group 1 elements and Group 2 elements and containing no potassium (K). Also disclosed is a brazing sheet which includes an aluminum alloy core; a filler material lying on or over at least one side of the core; and a flux layer lying on or over one side of the filler material and including the flux composition.

Flux composition and brazing sheet

An aluminum alloy brazing sheet for heat exchangers has a core, a sacrificial material formed on one side of the core, and a brazing filler metal formed on the other side of the core. The core is made of an aluminum alloy containing Si, Cu, Mn, and Al. The sacrificial material is made of an aluminum alloy containing Si, Zn, Mg, and Al. The brazing filler metal is made of an aluminum alloy. The aluminum alloy brazing sheet for heat exchangers has a work hardening exponent n of not less than 0.05. The core has an average crystal grain size of not more than 10 &#x3bc;m in a cross-section. The aluminum alloy brazing sheet for heat exchangers has excellent strength and corrosion resistance even when it is formed into a thin material and also has excellent high frequency weldability and weld cracking resistance during electric resistance welding.

Aluminum alloy brazing sheet for heat exchanger

There are provided an aluminum-alloy clad sheet and a clad sheet subjected to heating equivalent to brazing, which each have a high strength and an excellent erosion resistance and thus allow a reduction in thickness of a clad sheet subjected to heating equivalent to brazing such as an aluminum alloy radiator tube, and/or of a clad sheet such as an aluminum-alloy brazing sheet. An aluminum-alloy clad sheet or a clad sheet subjected to heating equivalent to brazing includes at least a core aluminum alloy sheet and an aluminum-alloy sacrificial anti-corrosive material cladded with each other, and is to be formed into a heat exchanger by brazing. The core aluminum alloy sheet includes a specified 3000 series composition. Furthermore, the strength and the erosion resistance of the core aluminum alloy sheet are improved through control of grain size distribution of precipitates having a size in a specified level in the core aluminum alloy sheet, or control of the average number density and the composition of dispersed particles therein.

Aluminum-alloy clad sheet

To provide an aluminum alloy brazing sheet which can improve erosion resistance while maintaining post-braze strength, brazability, formability, corrosion resistance and other properties even when Mg is added to the core material. The aluminum alloy brazing sheet comprises an Al&#x2014;Si-based or Al&#x2014;Si&#x2014;Zn-based filler material cladded on at least one side of a core material. The core material comprises Si: 0.3 to 1.0% by mass, Mn: 0.6 to 2.0% by mass, Cu: 0.3 to 1.0% by mass, Mg: 0.15 to 0.5% by mass, Ti: 0.05 to 0.25% by mass, with the remainder being Al and inevitable impurities, and has the density of an Mg&#x2014;Si-based, Al&#x2014;Mg&#x2014;Cu-based, Al&#x2014;Cu&#x2014;Mg&#x2014;Si-based intermetallic compound with a particle size smaller than 0.5 &#x3bc;m of 10000/mm2 or higher, or has the density of the Mg&#x2014;Si-based, Al&#x2014;Mg&#x2014;Cu-based and Al&#x2014;Cu&#x2014;Mg&#x2014;Si-based intermetallic compounds with a particle size of 1.0 &#x3bc;m or larger lower than 5000/mm2.

Aluminium alloy brazing sheet

There is provided an aluminum alloy brazing sheet having an improved brazability than in the related art while keeping the post-braze strength, workability, corrosion resistance, and the like at respective prescribed or higher levels. An aluminum alloy brazing sheet has a two-layered structure in which on one side of a core material, a brazing material is provided. The core material contains Si: 0.6 to 1.0 mass %, Cu: 0.6 to 1.0 mass %, Mn: 0.7 to 1.8 mass %, Mg: 0.1 to 0.7 mass %, and Ti: 0.06 to 0.20 mass %, and the balance including Al and inevitable impurities. The brazing material includes an aluminum alloy containing Si: 3.0 to 12.0 mass %, the gage of the aluminum alloy brazing sheet is 0.6 to 1.4 mm, and the area ratio of a {001} plane in the core material surface is 0.3 or more.

Aluminum alloy brazing sheet

An aluminum alloy brazing sheet includes a core material containing Si, Cu and Mn by a predetermined amount, the balance being Al and inevitable impurities, a sacrificial anode material disposed on one face side of the core material and containing Si, Zn and Mg by a predetermined amount, the balance being Al and inevitable impurities, and a brazing filler material disposed on the other face side of the core material and formed of an aluminum alloy, and the area fraction of Zn&#x2014;Mg-based intermetallic compounds with 2.0 &#x3bc;m or above particle size on the surface of the sacrificial anode material may be 1.0% or below. Or otherwise, in the aluminum alloy brazing sheet, the number density of Al&#x2014;Cu-based intermetallic compounds with 0.5 &#x3bc;m or above particle size inside the core material may be 1.0 piece/&#x3bc;mor below.

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Moka, Japan

Takahiro Izumi