DEFINITIONS AND TERMS (cont) - TM-750-245-40092

TM 750-245-4

COMPOSITE ELECTRODE: A filler metal electrode

DEPOSITION EFFICIENCY: The ratio of the weight of

used in arc welding, consisting of more than one metal

deposited metal to the net weight of electrodes

component combined mechanically. It may or may not

consumed exclusive of stubs.

include materials that improve the properties of the

weld, or stabilize the arc.

DEPTH OF FUSION: The distance from the original

surface of the base metal to that point at which the

COMPOSITE JOINT: A joint in which a thermal and

fusion ceases in a welding operation.

mechanical process is used to unite the base metal

parts.

DEWETTING. Separation of printed or plated circuits

from the circuit board. This is usually the result of

CONCAVITY: The maximum distance from the face of a

excessive heat being applied during soldering

concave fillet weld perpendicular to a line joining the

operations.

Also, failure of solder to flow when

toes.

reworking a solder joint due to contamination.

CONCURRENT HEATING: Supplemental heat applied

DIE: a. Resistance Welding. A member, usually

to a structure during the course of welding.

shaped to the work contour, used to clamp the parts

being welded and conduct the welding current.

CONE: The conical part of a gas flame next to the

b. Forge Welding. A device used in forge welding

orifice of the tip.

primarily to form the work while hot and apply the

necessary pressure.

CONVEXITY: The maximum distance from the face of a

convex fillet weld perpendicular to a line joining the

DIE WELDING: A forge welding process in which fusion

toes.

is produced by heating in a furnace and by applying

pressure by means of dies.

CORNER JOINT: A joint between two members located

approximately at right angles to each other in the form

DIP BRAZING: A brazing process in which fusion is

of an L.

produced by heating in a molten chemical or metal bath

and by using a nonferrous filler metal having a melting

CORROSIVE WEAR: Wear due to atmospheric or

point above 800 F, but below that of the base metals.

chemical corrosion.

The filler metal is distributed in the joint by capillary

attraction.

COVER GLASS: A clear glass used in goggles, hand

When a metal bath is used the bath provides the filler

shields, and helmets to protect the filter glass from

metal.

splattering material.

DRAG: The horizontal distance between the entrance

COVERED ELECTRODE : A metal electrode with a

and the point of exit of a cutting oxygen stream.

covering material which stabilizes the arc and improves

the properties of the welding metal. The material may

DROPPING POINT: The temperature at which a grease

be an external wrapping of paper, asbestos and other

will pass from a semisolid to a fluid state.

materials or flux covering.

CRATER: A depression at the termination of an arc

weld.

EDGE JOINT: A joint between the edges of two or more

parallel or nearly parallel members.

CURRENT DENSITY: Amperes per square inch of the

electrode sectional area.

EDGE PREPARATION: The contour prepared on the

edge of a member for welding.

CUTTING TIP: A gas torch tip especially adapted for

cutting.

EFFECTIVE LENGTH OF WELD: The length of a weld

throughout which the correctly proportioned cross

CUTTING TORCH: A device used in gas cutting for

section exists.

controlling the gases used for preheating and the

oxygen used for cutting the metal.

ELECTRODE: a. Metal Arc - Filler metal in the form of

a wire or rod, whether bare or covered, through which

CYLINDER: A portable cylindrical container used for

current is conducted between the electrode holder and

transportation and storage of a compressed gas.

the arc.

b. Carbon Arc - A carbon or graphite rod through

which current is conducted between the electrode holder

and the arc.

DENT: A slight hollow in a surface, generally circular in

c. Atomic Hydrogen - One of the two tungsten rods

shape and having a low point near the center of the

between the points of which the arc is maintained.

circular area. The surface is not cut.

DEPOSITED METAL: Filler metal that has been added

during a welding operation.

B-6