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Arc Force

The axial force developed by an arc plasma during a welding procedure.

Arc Gouging

A thermal gouging that uses an arc-cutting process to form a bevel or groove.

Arc Length

The distance from the tip of the welding electrode to the adjacent surface of the weld pool.

Arc Spraying

A thermal spraying process using an arc between two consumable electrodes of surfacing materials as a heat source, and a compressed gas to atomize and propel the surfacing material to the substrate.

Arc Welding

A weld process that produces fusion of work pieces by heating them with an arc with or without the application of pressure and with or without filler metal.

Architecture

The physical structure of a computer's internal operations, including its registers, memory, instruction set, input/output structure, and so on.

Arcing

1. The process of grinding or forming drum brake linings to conform to the drum diameter and provide clearance where needed. 2.A term that applies to the spark that occurs in an electrical circuit in an air gap, such as a spark plug.

Arcing Time

The time elapsing from the severance of the circuit to the final interruption of current flow.

Arid

Dry.

Arithmetic-logic Unit

A basic element of the central processing unit (CPU) in a computer. That portion of the CPU where arithmetic and logical operations are performed.

Arm

1. To turn on a theft-deterrent system. 2. Crankshaft throw. Also see long arm and short arm.

Armature

1. A part moved by magnetism. 2. A part moved through a magnetic field to produce current. 3. The rotating unit inside a dc generator or starter.

Armco

The trade name of a particular type of guard rail or barrier used on public roadways and race courses.

Arming

In an automobile anti-theft system, arming means placing the alarm system in readiness, enabling it to detect an illegal entry. Arming is accomplished when the ignition switch is turned off and the doors are locked.

Arming Sensor

A device that places an alarm system into the "Redy Mode" to detect an illegal entry.

Armored Ring Groove

A metal ring groove cast into a piston during manufacturing to increase resistance to wear.

Arnoid Gauge

An instrument used to align the center of a crankshaft journal with the centers of a crankshaft grinder.

Arnoid Hydrocarbons

Compounds having carbons linked in a closed ring by alternating single and double bonds.

Aromatic

A type of solvent based on benzene ring molecules. Aromatics are often used as diluents in acrylic lacquers. In gasoline aromatics are commonly used for the BTX group (benzene, toluene, xylene) and are hydrocarbons.

Arsenic

One of the chemical elements. Atomic number 33. Atomic weight 74.9216. Symbol As.