Aluminum brazing method and furnace therefor
AssigneeNippondenso Co., Ltd.
InventorsToshiaki Maeda, Shinji Kurano
Life of this patent
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Abstract
An aluminum brazing method includes the steps of preheating aluminum members in the form of workpieces coated with flux and brazing material in antioxidizing atmosphere gas up to a temperature around the flux activating temperature, and then heating the aluminum members from the temperature around the flux activating temperature to the brazing temperature mainly by forced convection of the anti-oxidizing atmosphere gas. An aluminum brazing furnace includes radiation intercepting members which are provided in the brazing chamber and which intercept the heat radiation to the work-pieces.
Claims6
An aluminum brazing method comprising:
- a preheating step in which aluminum or aluminum alloy members in the form of work-pieces coated, at least in sections to be brazed, with flux of potassium aluminum fluoride and brazing material of Al-Si-alloy system are preheated in an anti-oxidizing atmosphere up to a starting temperature of activating said flux;
- a brazing step in which the preheated work-pieces are further heated within a surrounding means inhibiting radiation heat to the work-pieces mainly by forced convection in said anti-oxidizing atmosphere from said starting temperature up to a determined temperature at a rate of 5.degree. C. to 25.degree. C. per minute to gradually activate the flux and melt the brazing material;
- and
- a gradual cooling step in which the brazed work-pieces are gradually cooled in said anti-oxidizing atmosphere.
Dependencies are inferred from the claim text.