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The number following the decimal point indicates whether the alloy is a casting (.0) or an ingot (.1 or .2).A capital letter prefix indicates a modification to a specific alloy.With the growth of aluminum within the welding fabrication industry, and its acceptance as an excellent alternative to steel for many applications, there are increasing requirements for those involved with developing aluminum projects to become more familiar with this group of materials.

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This is followed by quenching, usually in water, to produce a supersaturated solution at room temperature.

Solution heat treatment is usually followed by aging.

WROUGHT ALUMINUM ALLOY DESIGNATION SYSTEM Cast Alloy Designation - The cast alloy designation system is based on a 3 digit-plus decimal designation xxx.x (i.e. The first digit (Xxx.x) indicates the principal alloying element, which has been added to the aluminum alloy (see table 2).

CAST ALUMINUM ALLOY DESIGNATION SYSTEM The second and third digits (x XX.x) are arbitrary numbers given to identify a specific alloy in the series.

Aging is the precipitation of a portion of the elements or compounds from a supersaturated solution in order to yield desirable properties.

Strain Hardened – Applies to products that are strengthened through cold-working.These publications can be extremely useful to the welding engineer when developing welding procedures, and when the consideration of chemistry and its association with crack sensitivity is of importance.Aluminum alloys can be categorized into a number of groups based on the particular material’s characteristics such as its ability to respond to thermal and mechanical treatment and the primary alloying element added to the aluminum alloy.Solution Heat Treatment is the process of heating the alloy to an elevated temperature (around 990 Deg.F) in order to put the alloying elements or compounds into solution.This course centers on the increasing number of women and juvenile girls who are incarcerated in the United States, and the now more than one million women under some form of correctional supervision in America.

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