©
COPYRIGHT 1999 THE ESAB GROUP, INC. LESSON
I, GLOSSARY
Constant Voltage —
(As applied to welding machines.)
A welding power source which will
produce a relatively small change in voltage when the amperage
is changed substantially. Used mostly for welding with
solid or flux cored electrodes.
Direct Current
— An
electrical current which flows in only one direction in a
conductor. Direction of current
is dependent upon the electrical connections
to the battery or other DC power source. Terminals on
all DC devices are usually marked (+)
or (-). Reversing the leads will
reverse the direction of current flow. Electron
— Negatively
charged particles that revolve around the positively charged
nucleus in an atom. Ferrous
— Containing
iron. Example: carbon steel, low alloy steels, stainless
steel. Hertz
— Hertz
(Hz) is the symbol which has replaced the term “cycles per
second.” Today, rather than
saying 60 cycles per second or simply 60
cycles, we say 60 Hertz or 60 Hz. High
Alloy Steels — Steels
containing in excess of 10% alloy content. Stainless steel is
considered a high alloy because it
contains in excess of 10% chromium.
Induced Current or
Induction
— The
phenomena of causing an electrical current to flow through a
conductor when that conductor is subjected
to a varying magnetic field.
Ingot —
Casting of steel (weighing up to 200
tons) formed at mill from melt of
ore, scrap limestone, coke, etc. Insulator
— A
material which has a tight electron bond, that is, relatively few
electrons which will move when voltage
(electrical pressure) is applied.
Wood, glass, ceramics and most plastics are good insulators.
