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132
DIRECT CURRENT ELECTRODE NEGATIVE (DCEN)
The arrangement of direct current arc welding leads in which the work
is the positive pole and the electrode is the negative pole of the
welding arc.
DIRECT CURRENT ELECTRODE POSITIVE (DCEP)
The arrangement of direct current arc welding leads in which the work
is the negative pole and the electrode is the positive pole of the
welding arc.
DISCONTINUITY
An interruption of the typical structure of a weldment, such as lack of
homogeneity in the mechanical, metallurgical, or physical
characteristics of the material or weldment. A discontinuity is not
necessarily a defect.
DRAG
The horizontal distance between the point of entrance and the point of
exit of a cutting oxygen stream.
DUCTILITY
The property of a metal which allows it to be permanently deformed,
in tension, before final rupture. Ductility is commonly evaluated by
tensile testing in which the amount of elongation and the reduction of
area of the broken specimen, as compared to the original test specimen,
are measured and calculated.
DUTY CYCLE
The percentage of time during an arbitrary test period, usually 10
minutes, during which a power supply can be operated at its rated
output without overloading.
EDGE JOINT
A joint between the edges of two or more parallel or nearly parallel
members.
EDGE PREPARATION
The contour prepared on the edge of a joint member for welding.
EFFECTIVE LENGTH OF WELD
The length of weld throughout which the correctly proportioned cross
section exits.
ELECTRODE
a. Metal-Arc
. Filler metal in the form of a wire or rod, whether bare or
covered, through which current is conducted between the electrode
holder and the arc.
b. Carbon-Arc
. A carbon or graphite rod through which current is
conducted between the electrode holder and the arc.
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