Glossary “base material” Definition:
Material to be welded, usually metal or plastic.

Glossary “base metal” Definition:
1). The largest proportion of metal present in an alloy. 2). A metal that readily oxidizes, or that dissolves to form ions. 3). The metal or alloy that is welded, brazed, soldered, or cut. 4). After welding, that part of the metal that was not melted.

Glossary “base timing” Definition:
Base ignition timing setting, before or without PCM control.

Glossary “base voltage” Definition:
1). Beginning or starting voltage level of a circuit. 2). Voltage applied at the base of a transistor.

Glossary “base gauges” Definition:
First two body gauges hung near the center of the vehicle, usually at torque box areas when measuring for major damage.

Glossary “base idle” Definition:
1). Manufacturers recommenended idle speed. 2). The RPM that the IAC solenoid attemps to maintain. 3). Idle RPM determined by the throttle lever hardset on the throttle body.

Glossary “base ignition timing” Definition:
The number of degrees BTDC the ignition is fired without advance of any kind.

Glossary “base coat” Definition:
The initial layer of paint.

Glossary “base coat patch” Definition:
Small area on the vehicle’s surface without clearcoat that enables the painter to check for color match with tri-coat colors.

Glossary “base current” Definition:
The amount of current that flows through the base-emitter section of a transistor.

Glossary “base engine timing” Definition:
Spark advance in degrees BTDC that provides the best combustion and power at very low RPM for starting.

Glossary “base 10” Definition:
A base unit in the metric system. All metric units are increased or decreased in units of 10. One meter, for example, has 10 decimeters, 100 centimeters, or 1,000 millimeters.

Glossary “base circle” Definition:
The low portion of each cam on the camshaft, concentric with the journal, which is not part of the lobe.