©
COPYRIGHT 1999 THE ESAB GROUP, INC. LESSON
I, GLOSSARY
APPENDIX
A LESSON
I -
GLOSSARY OF
TERMS AISI
— American
Iron and Steel Institute Allotropic
— A
material in which the atoms are capable of transforming into two
or more crystalline structures at different
temperatures. Alternating
— An
electrical current which alternately travels in either direction in a
Current
conductor. In 60 cycles per second
(60 Hz) AC, the frequency used
in the U.S.A., the current direction reverses 120 times every
second. Ampere
— Unit
of electrical rate of flow. Amperage is commonly referred to as
the “current”
in an electrical circuit. ASME
— American
Society of Mechanical Engineers ASTM
— American
Society for Testing and Materials Atom
— The
smallest particle of an element that posses all of the characteristics
of that element. It consists of protons, neutrons,
and electrons.
Carbon Steel
— (Sometimes
referred to as mild steel.) An alloy of iron and carbon.
Carbon content is usually below 0.3%.
Conductor
— A
material which has a relatively large number of loosely bonded
electrons which may move freely when
voltage (electrical pressure) is
applied. Metals are good conductors. Constant
Current — (As
applied to welding machines.) A welding power source which
will produce a relatively small change
in amperage despite changes
in voltage caused by a varying arc length. Used mostly
for welding with coated electrodes.
