Denso Corporation

Canon Machinery Inc.

Uacj Corporation

Chiba Institute of Technology

Haruhiko Matsushita

Tomoki Yamayoshi

Yasunaga Itoh

Takashi Ando

Shogo Yamada

Satoshi Nohira

Shin Takewaka

Hiroshi Nishimura

Toru Nagasawa

Ryusuke Iwasaki

Shumpei Ozawa

Shinya Nishihata

Tohru Nagasawa

In a method for brazing a sheet material without use of flux, an inert gas is firstly introduced into an oxygen pump to reduce an oxygen partial pressure in the inert gas to 1&#xd7;10Pa or less, and the sheet material is heated in a brazing furnace in an atmosphere of the inert gas discharged from the oxygen pump. A core alloy of the sheet material or a brazing filler alloy cladded to a surface of the core alloy contains Mg. Both the core alloy and the brazing filler alloy may contain Mg. Accordingly, brazability of the sheet material is sufficiently improved.

Method for brazing sheet material and heat exchanger

The oxygen partial pressure control unit includes a gas purification section for purifying the gas having the oxygen partial pressure controlled within a range of from 0.2 to 10atm, and a tank for storing the purified gas produced by the gas purification section. The purified gas stored within the tank is supplied to the another unit. The oxygen partial pressure control unit includes a circulation circuit including the tank and the gas purification section. The gas filled in the tankis caused to circulate along the circulation circuit, and the purified gas produced by the gas purification section is stored in the tank.

Oxygen partial-pressure control unit and method of gas supply

Work W to which oil has adhered is heated in the heating furnace 28 and adhering oil is evaporated. Gas containing the evaporated oil component is burned in the combustor 35. A portion of the generated combustion gas is circulated into the heating furnace 28 through the circulating duct 38, and an amount of the circulating combustion gas is controlled in accordance with a temperature in the heating furnace 28. Processing of aluminum materials is carried out using a base oil of hydrocarbon, the maximum molecular weight M of which is not less than 282 and not more than 378, and an additive of not less than 3% by weight of alcohol or carboxylic acid, the maximum molecular weight M of which is not more than 378.

Processing oil suitable for aluminum materials and removable via heating

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Kyoto, Japan

Haruhiko Matsushita