ALUMINUM GLOSSARY - I, J, K

Impact

A part formed in a confining die from a metal slug, usually cold, by rapid single stroke application of force through a punch, causing the metal to flow around the punch and/or through an opening in the punch or die.

Impact Strength

The ability of a material to withstand shock loading.

Inclusion

Foreign material in the metal or impressed into the surface.

Inclusion, Stringer

An impurity, metallic or non-metallic, which is trapped in the ingot and elongated subsequently in the direction of working. It may be revealed during working or finishing as a narrow streak parallel to the direction of working.

Inflation

The term associated with hollow profiles that extrude convex rather than flat.

Ingot

A cast form suitable for remelting or fabricating. See Fabricating Ingot , Extrusion Ingot , Forging Ingot .

Insulator

A material that resists the flow of heat, sound, electricity or another form of energy.

Interference Fit

The class of fit in which a mating part is deliberately made slightly oversize for the part into which it will be inserted.

Interleaving

The insertion of paper or application of suitable strippable coatings between layers of metal to protect from damage.

Interlocking Joint

A joint in which a curved projection on one part is inserted by a rotating motion into a similarly curved receiving groove on the other part. The parts cannot then be separated by straight-line motion.

Joint Efficiency

The strength of a welded joint expressed as a percentage of the strength of the unwelded base metal.

Kerf

The notch or slit made by a saw or torch when cutting.

Key-locked Joint

A joint with two or more primary elements which are locked together only when an additional specialized part, the key is inserted to prevent them from separating.

Keyway

A slot in the shaft of a mechanical drive system that provides a means of locking a gear or other part onto the shaft.

Kink

An abrupt deviation from straightness. A kink can be caused by handling.