A strong
leak-proof joint can easily and economically achieved using modern
brazing techniques. This includes the brazing of assemblies with joints that are
inaccessible. Different thickness and shapes are not a problem with aluminum dip brazing.
Parts with thick and thin cross sections can be joined to for a single assembly even if
some of the components are wrought or cast alloys. All this can be achieved during one
simultaneous brazing process. A wide variety of aluminum
alloys can be brazed, though not all.Strength of an
Aluminum Dip Braze Joint
The nature of the inter-metallic bond is such that even a simple
joint will have equal or greater strength than of the base metal. Temper can be restored
with a twenty-four hour aging process to T4 or with an extra heat treatment operation to
achieve a T6 temper.
Corrosion Resistance of Aluminum Dip Braze Assemblies
The corrosion of aluminum dip braze assemblies is the same as that
of the base metal, assuming the flux residual has been removed after brazing and the
joints do not have cracks or fissures that entrap salt that may leech out later. It is
possible to insure complete removal of flux and confirm no entrapped salts will leech
through the use of a silver nitrate test or a dye penetrate
test.
Fatigue And Thermal Properties Of Aluminum Dip Braze Assemblies
The natural shape of the meniscus formed by the filler metal is
ideally shaped to resist fatigue. Any stress of the assembly is evenly distributed around
the fillet and disperses the stress uniformly over a larger stress area. For this reason
aluminum dip brazing is superior to welding.
Distortion Of Aluminum Dip Braze Assemblies
Large and extremely complex shapes can be brazed with minimal
distortion at relatively lower-than-welding temperatures. Brazing utilized uniform
application of heat and works in conjunction with the high thermal conductivity properties
associated with aluminum. This uniform application of heat reduces the incidence of
distortion that is particularly problematic when attempting to manufacture an assembly by
welding.
Final Appearance of Aluminum Dip Brazing Assemblies
The aluminum dip braze process does not create unsightly slag at the
braze joints. In comparison, braze joints form a uniform fillet that requires little or no
metal finishing after the aluminum dip brazing process. At Coleman Microwave Co. all dip
brazed assemblies receive a chemical cleaning subsequent to brazing that leave the
assembly looking very clean and shiny. If features used to fixture the aluminum dip braze
assembly are to be removed after brazing, the chemical cleaning will occur after grinding
them off.
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