|
Water Stain |
If oxygen is excluded from the wraps
of coiled product, from the inner surfaces of stacked flat products,
or from the faying surfaces of extruded products, and should
moisture be permitted to enter those areas through condensation or
water exposure, the moisture will have the tendency to steal the
oxygen from the skin of aluminum. When this happens, the surface of
the metal will become roughened and eventually pitted unless the
water is removed and those surfaces are kept exposed to the air or
kept free from further moisture. Although water stain is usually
only an aesthetic complaint, it can become severe enough to become a
structural problem by reducing metal thickness. Aluminum users
should learn and practice the basic rules for the handling and
storing of aluminum. |
|
Wavy |
Not flat. A slight wave following the
direction of rolling and beyond the standard limitation for
flatness. |
|
Wavy Edge |
A rippling departure of an edge from
flat. |
|
Weave |
"Oscillation" – Uneven
wrap in coiling and lateral travel during winding. Improper
alignment of rolls over which the metal passes before rewinding and
insufficient rewind tension are typical causes. |
|
Web |
- A single thickness of foil as it
leaves the rolling mill.
- A connecting element between ribs,
flanges, or bosses on shapes and forgings.
|
|
Wedge |
A hardwood stick used as a forming
tool in spinning. |
|
Weld |
A union made by welding. |
|
Weld Bead |
A deposit of filler metal from a
single welding pass. |
|
Weldability |
Suitability of a metal for welding
under specific conditions. |
|
Welding |
- A process used to join metals by
the application of heat. Fusion welding, which includes gas,
arc, and resistance welding, requires that the parent metals be
melted. This distinguishes fusion welding from brazing. In
pressure welding joining is accomplished by the use of heat and
pressure without melting. The parts that are being welded are
pressed together and heated simultaneously, so that
recrystallization occurs across the interface.
- Joining two or more pieces of
material by applying heat or pressure, or both, with or without
filler metal, to produce a loxalized union through fusion or
recrystallization across the interface.
|
|
Welding Rod |
A rolled, extruded, or cast round
filler metal for use in joining by welding. |
|
Welding Wire |
Wire for use as a filler metal in
joining by welding. |
|
Whip Marks |
Markings on a sheet generally running
normal to the direction of rolling, resulting from a whipping of the
sheet as it enters the rolling mill. |
|
Whisker |
"Hair, Slitter" – Minute
hair-like sliver along edge(s) due to shearing or slitting
operation. |
|
Wide Tolerance |
A tolerance wider than
"Standard". |
|
Work Hardening |
- Increase in resistance to
deformation (i.e. in hardness) produced by cold working.
- Same as strain hardening.
|
|
Workability |
The characteristic or group of
characteristics that determines the ease of forming a metal into
desired shapes. |
|
Wrap, Loose |
A condition in a coil due to
insufficient tension which creates a small void between adjacent
wraps. |
|
Wrinkle |
"Crease" – A sharp
deviation from flat in the sheet which is transferred from
processing equipment subsequent to the roll bite. |
|
Wrought Product |
Products which began as raw material
castings and are mechanically worked by processes such as rolling,
extruding, forging, etc. |
