Kobe Steel, Ltd.

Denso Corporation

Kabushiki Kaisha Kobe Seiko Sho

Shimpei Kimura

Toshiki Ueda

Takahiro Izumi

Fumihiro Koshigoe

Hayaki Teramoto

Yuji Shibuya

Michiyasu Yamamoto

Katsushi Matsumoto

Shoei Teshima

Masao Kinefuchi

Osamu Hakamata

Nobuhiro Kobayashi

Koichi Sakamoto

Akihiro Tsuruno

Shogo Yamada

Takahiro Shinoda

Eiichi Tamura

Shinji Sakashita

Haruyuki Konishi

Akihiko Tatsumi

Shingo Oono

Manabu Hasegawa

Motohiro Horiguchi

Satoshi Yoshida

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

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

Disclosed is an aluminum alloy brazing sheet for heat exchanger which excels in resistance to corrosion from its inside and simultaneously attains satisfactory erosion resistance and high strength. This includes a core material of an Al alloy containing predetermined amounts of Si, Mn, Cu, Mg, and Ti; a clad material of an Al alloy containing predetermined amounts of Si, Mn, and Zn, having a predetermined thickness, and lying on one side of the core material so as to constitute an inner side of a tube member of the heat exchanger; and a filler material of an Al alloy containing a predetermined amount of Si, having a predetermined thickness, and lying on the other side of the core material so as to constitute an outer side of the tube member. The crystal grain size of the core material after brazing under specific conditions is 50 &#x3bc;m or more but less than 300 &#x3bc;m in a rolling direction.

Aluminum alloy brazing sheet and method for producing the same

Disclosed is an aluminum alloy clad material which includes a core material; a sacrificial anode material on one surface of the core material; and a filler material on the other surface of the core material and composed of an Al&#x2014;Si alloy, in which the core material contains 0.3 to 2.0 percent by mass of Mn, 0.15 to 1.6 percent by mass of Si, 0.1 to 1.0 percent by mass of Cu, and 0.1 to 1.0 percent by mass of Mg, with the remainder including Al and inevitable impurities, the sacrificial anode material contains 7.0 to 12.0 percent by mass of Zn, 0.3 to 1.8 percent by mass of Mn, and 0.3 to 1.2 percent by mass of Si, with the remainder including Al and inevitable impurities, and has a thickness of 10 to 30 &#x3bc;m. The sacrificial anode material shows resistance to both local corrosion and general corrosion.

Aluminum alloy clad material

Provided is a multi-layered sheet which has undergone heating corresponding to brazing, such as an aluminum-alloy radiator tube, or a multi-layered sheet such as an aluminum-alloy brazing sheet. The multi-layered sheet can have a reduced thickness and has excellent fatigue properties. The multi-layered sheet of aluminum alloys comprises a core layer () which has been clad at least with a sacrificial layer (). This multi-layered sheet is a multi-layered sheet to be subjected to brazing or welding to produce a heat exchanger or is a multi-layered sheet which has undergone heating corresponding to brazing. The core layer () comprises a specific 3000-series composition. In this core layer (), the average density in number of dispersed particles having a specific size has been regulated. As a result, fatigue properties, which govern cracking, can be highly improved.

Multi-layered sheet of aluminum alloys

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.

Disclosed herein is an aluminum alloy clad sheet for a heat exchanger including a core layer, a sacrificial layer formed on one surface of the core layer, and a filler layer including an Al&#x2014;Si based alloy formed on the other surface of the core layer. The core layer includes a predetermined amount of Si, Cu, Mn, Ti, and Mg, the remainder including Al and inevitable impurities, and the sacrificial layer includes a predetermined amount of Si, Mn, and Zn, the remainder including Al and inevitable impurities. The core layer has a crystal grain size after the brazing heat treatment at 595&#xb0; C. for 3 minutes of at least 50 &#x3bc;m and less than 300 &#x3bc;m. The filler layer and the sacrificial layer are defined for their thickness, and the number of intermetallic compounds in the core layer is also defined to a predetermined range. By such constitution, the aluminum alloy clad sheet has improved fatigue life and post-braze strength, high corrosion resistance, and excellent erosion resistance and brazeability.

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Moka, Japan

Shimpei Kimura