Aluminum alloy sheet having good weldability, filiform corrosion

Details Aluminum alloy sheet having good weldability, filiform corrosion Aluminum alloy sheet having good weldability, filiform corrosion

1988-09-02

1990-03-20

Dean, R.

Metal treatment

Compositions

Heat treating

148 115A, 148415, 148417, 148439, 148440, C22F 104

Patent

active

049098616

ABSTRACT:
An aluminum alloy sheet according to the present invention essentially consists of an aluminum alloy containing 0.5 to 1.4% magnesium, 0.6 to 1.5% silicon, and 0.005 to 0.1% titanium, all by weight, and aluminum and inevitable impurities for the remainder, and is adjusted so that the ratio of the silicon content to the magnesium content is 0.65 or more. The average crystal grain size and the electric conductivity of the aluminum alloy sheet are 70 .mu.m or less and 43 to 51% IACS, respectively.
The composition of the aluminum alloy is adjusted in this manner, and the crystal grain size and the electric conductivity are restricted within the specific ranges by controlling the manufacturing conditions. Thus, there may be provided an aluminum alloy sheet which is improved in arc-weldability and resistance to filiform corrosion, as well as in formability and bake-hardenability at low temperature.

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