초록 ▼

An improved method is provided for producing an aluminum tube of the type used as cooling tubes for heat exchangers, and particularly automotive heat exchangers. The method utilizes a flux-containing composition that can be selectively deposited in a manner that permits the manufacture of aluminum t

An improved method is provided for producing an aluminum tube of the type used as cooling tubes for heat exchangers, and particularly automotive heat exchangers. The method utilizes a flux-containing composition that can be selectively deposited in a manner that permits the manufacture of aluminum tubes having a lockseam construction. As a result, the method made possible by this invention provides for the manufacture of heat exchanger tubes that offer the weight, durability and safety advantages of aluminum alloy construction, but at lower investment, processing and material costs as compared to prior art welded aluminum tubes. Another advantage of the present method is that minimal amounts of braze alloy and flux are required, yet uniform and consistent brazed joints can be produced to yield leak-proof brazed assemblies.

대표청구항 ▼

A method for manufacturing an aluminum alloy heat exchanger tube, the method comprising the steps of: providing an unclad aluminum alloy flat stock having oppositely disposed longitudinal edges; rolling the flat stock so as to form a flat-type tube having a longitudinally-oriented lockseam formed by

A method for manufacturing an aluminum alloy heat exchanger tube, the method comprising the steps of: providing an unclad aluminum alloy flat stock having oppositely disposed longitudinal edges; rolling the flat stock so as to form a flat-type tube having a longitudinally-oriented lockseam formed by the longitudinal edges of the flat stock; depositing a flux-brazing composition on at least the lockseam of the tube, the flux-brazing composition comprising a flux material, an aluminum-silicon powder and a binder; and heating the tube for a duration that is sufficient to melt the flux-brazing composition and thereby braze the lockseam to form a leak-proof seal.