文档介绍：ESAB Glossary
of
Technical Terms
Last updated 07SEP05
Acceptable Weld - A weld that meets the applicable requirements.
Active Fluxes - Active fluxes produce changes in weld metal chemistry when welding is changed. Ac-
tive fluxes are restricted to single or minimal multi-pass welding.
Actual Throat - The shortest distance between the weld root and the face of a fillet weld.
Aging - Process of holding metals or alloys at room temperature after subjecting them to shaping or
heat treatment, for the purpose of increasing dimensional stability or to improve their hardness and
strength through structural changes, as by precipitation.
Air Carbon Arc Cutting - A carbon arc cutting process variation that removes molten metal with a jet
of air.
Air Hardening - Characteristic of a steel that it es partially or fully hardened (martensitic) when
cooled in air from above its critical point. Not necessarily applicable when the object to be hardened
has considerable thickness.
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.
Allotropic Change - Change from one crystal structure of a metal to another that has different physi-
cal properties.
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 ., the current direction reverses 120
times every second.
Ampere - Unit of electrical rate of flow. Amperage monly referred to as the current“” in an electri-
cal circuit.
Anneal - The process of heating a metal to a temperature below the critical range, followed by a rela-
tively slow cooling cycle to induce softness and remove stresses.
Annealing - Subjected to heat treatment. This usually involves heating, followed by relatively slow
cooling of metals or alloys for the purpose of decreasing hardness and inc