Dear Readers,
Following Terms are commonly used in
Welding works
Camber – Deviation from edge
straightness, usually the greatest deviation of side edge from a straight line.
Cap Pass – The final pass of a
weld joint, it can be made with a weave motion back and forth, or with stringer
beads tied into each other.
Carrier Gas – In thermal
spraying, the gas used to carry powdered materials from the powder feeder or
hopper to the gun.
Capillary Action – The action by
which the liquid surface is elevated or depressed where it contacts a solid
because the liquid molecules are attracted to one another and to the solid
molecules.
Cladding – A thin (>
0.04" or 1mm) layer of material applied to the base material to improve corrosion
or wear resistance of the part.
Clad Metal
– A composite metal containing two or three layers that have been welded
together. The welding may have been accomplished by roll welding, arc welding,
casting, heavy chemical deposition, or heavy electroplating.
Coalescence – The uniting of many
materials into one body.
Coated Electrode
- That is the
flux on the filler metal of a welding rod.
Coherent – Moving in unison.
Cold Lap – Incomplete fusion or
overlap.
Collimate – To render parallels
to a certain line or direction.
Complete Fusion – Fusion that has
occurred over the entire base material surfaces intended for welding, and
between all layer and passes.
Complete Joint Penetration –
Joint penetration in which the weld metal completely fills the groove and is
fused to the base metal throughout its total thickness.
Concavity - It is when a Fillet
Weld bead sags inward from the root Face to the Root.
Constant Current Power Source –
An arc welding power source with a volt-ampere output characteristic that
produces a small welding current change from a large arc voltage change.
Contact Tube – A system component
/ A device that transfers current from the torch gun to a continuous electrode.
Contact Resistance – The
resistance in ohms between the contacts of a relay, switch, or other device
when the contacts are touching each other.
Convexity - This is when a Fillet
Weld bead protrudes outwards from the Root to the Face.
Corner Joint - One of the five
basic weld Joints. It is when the edges of two plates butt up to each other at
a 90-degree angle. It usually provides a groove to fill providing good
Penetration.
Covered Electrode – A filler
metal electrode used in shielded metal-arc welding, consisting of a metal-wire
core with a flux covering.
Crater – In arc welding, a
depression on the surface of a weld bead.
Crater Crack – A crack in the
crater of a weld bead.
Critical Temperature - This is
when the base metal transitions from solidus to liquidus as you heat it during
the welding process.
Cryogenic – Refers to low
temperatures, usually -200°C (-130°F) or below.
Current - In the electric circuit
the current is the flow of electricity. What you're welding on resists the flow
and that forms heat. AMPS are the measurement of your current.
Cutting Attachment – A device for
converting an oxy-fuel gas-welding torch into an oxy-fuel cutting torch.
Cylinder – A portable container
used for transportation and storage of a compressed gas.
Defect – A discontinuity or
discontinuities that by nature or accumulated effect (for example, total crack
length) renders a part or product unable to meet minimum applicable acceptance
standards or specifications.
Density – The ratio of the weight
of a substance per unit volume, e.g. mass of a solid, liquid, or gas per unit
volume at a specific temperature.
Deposited Metal
– Filler metal
that has been added during welding, brazing, or soldering.
Deposition Efficiency – In arc
welding, the ratio of the weight of deposited metal to the net weight of filler
metal consumed, exclusive of stubs.
Deposition Rate – The weight of
material deposited in a unit of time. It is usually expressed as pounds hour
(lb/h) or kilograms per hour (kg/h).
Depth of Fusion – The distance
that fusion extends into the base metal or previous pass from the surface
melted during welding.
Dew Point – The temperature and
pressure at which the liquefaction of a vapor begins. Usually applied to
condensation of moisture from the water vapor in the atmosphere.
Dilution – The change in chemical
composition of a welding filler material caused by the admixture of the base
material or previously deposited weld material in the deposited weld bead.
Direct Current – Electric current
that flows in one direction.
Direct Current Electrode Negative (DCEN) – The arrangement of direct current arc welding leads in where the
electrode is the negative pole and workpiece is the positive pole of the
welding arc.
Direct Current Electrode Positive (DCEP) – The arrangement of direct current arc welding leads in where the
electrode is the positive pole and workpiece is the negative pole of the
welding arc.
Ductility - Is the metal bending
and staying bent without breaking.
Duty Cycle – The percentage of
time during a period that a power source can be operated at rated output
without overheating.
Dynamic Load – A force exerted by
a moving body on a resistance member, usually in a relatively short time
interval.
