Method and apparatus for applying brazing material to a metal ho

Details Method and apparatus for applying brazing material to a metal ho Method and apparatus for applying brazing material to a metal ho

1994-09-28

1995-07-11

Heinrich, Samuel M.

Metal fusion bonding

Process

Plural joints

2282481, 228 41, B23K 3704

Patent

active

054313309

ABSTRACT:
A method for applying brazing material to an approximately metallic honeycomb body being wound, stratified or intertwined from at least partly structured sheet-metal layers, for brazing at least in partial regions, includes applying a thin film of a rolling oil to at least the structured sheet-metal layer, if such a film is not already present from production process; heat-treating the oil film to remove volatile components; placing regions of the sheet-metal layers to be provided with brazing material into contact with an aqueous solution of a surfactant; and putting the honeycomb bodies produced from the sheet-metal layers into contact with powdered brazing material adhering to locations where residues of the oil and the surfactant have come together. An apparatus for applying the brazing material to the honeycomb includes a heating station for passing a flow of hot air through a honeycomb body and heat-treating an oil film at a temperature of approximately 150.degree. to 250.degree. C. and preferably 200.degree. to 230.degree. C.; an application station for applying an aqueous solution of a surfactant onto at least one end surface of the honeycomb body with an absorbent material; a drying station for drying the honeycomb body in an airflow at approximately 100.degree. to 160.degree. C. and preferably 130.degree. to 150.degree. C.; and a brazing material application station for passing a flow of a gas through an accumulation of powdered brazing material from below to form a fluidized bed.

REFERENCES:
patent: 3722071 (1973-03-01), Van Orsdel
patent: 4522859 (1985-06-01), Blair
patent: 5082167 (1992-01-01), Sadano et al.

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