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 TM 750-245-4
angle less than 45 degrees to the horizontal, and the
the work while an inert gas flows around the weld area
parts welded being vertically or approximately vertically
to prevent oxidation. No flux is used.
disposed.
INTERPASS TEMPERATURE: In a multipass weld, the
HORN: The electrode holding arm of a resistance spot
lowest temperature of the deposited weld metal before
welding machine.
the next pass is started.
HORN SPACING: In a resistance welding machine, the
J
unobstructed work clearance between horns or platens
at right angles to the throat depth. This distance is
JOINT: That portion of a structure in which separate
measured with the horns parallel and horizontal at the
base metal parts are joined.
end of the downstroke.
JOINT PENETRATION: The maximum depth a groove
HOT SHORT: A condition which occurs when a metal is
weld extends from its face into a joint, exclusive of
heated to that point, prior to melting, where all strength
reinforcement.
is lost but the shape is still maintained.
K
HYDROGEN BRAZING: A method of furnace brazing in
a hydrogen atmosphere.
KERF: The space from which metal has been removed
by a cutting process.
HYDROMATIC WELDING: See pressure controlled
welding.
L
I
LAP JOINT: A joint between two overlapping members.
IMPREGNATED-TAPE METAL-ARC WELDING: An arc
LAYER: A stratum of weld metal, consisting of one or
welding process in which fusion is produced by heating
more weld beads.
with an electric arc between a metal electrode and the
work. Shielding is obtained from decomposition of an
LEG OF A FILLET WELD: The distance from the root of
impregnated tape wrapped around the electrode as it is
the joint to the toe of the fillet weld.
fed to the arc. Pressure is not used, and filler metal is
obtained from the electrode.
LOCAL PREHEATING: Preheating a specific portion of
a structure.
INDUCTION BRAZING: A process in which fusion is
produced by the heat obtained from resistance of the
LOCAL STRESS RELIEF HEAT TREATMENT: Stress
work to the flow of induced electric current and by using
relief heat treatment of a specific portion of a structure.
a nonferrous filler metal, having a melting point above
800 degrees F, but below that of the base metals. The
LUBRICANT BASE: The type of soap (sodium, lime,
filler metal is distributed in the joint by capillary
lithium, lead, aluminum, etc.) used in the manufacture
attraction.
of greases.
INDUCTION WELDING: A process in which fusion is
M
produced by heat obtained from resistance of the work
to the flow of induced electric current, with or without the
MAGNETIC INDUCTION: Flux per unit cross-sectional
application of pressure.
area, flux density.
INERT-GAS CARBON-ARC WELDING: An arc welding
MASH SEAM WELDING: A seam weld made In a lap
process in which fusion is produced by heating with an
joint in which the thickness at the lap is reduced
electric arc between a carbon electrode and the work.
plastically to approximately the thickness of one of the
Shielding is obtained from an inert gas such as helium
lapped joints.
or argon. Pressure and / or filler metal may or may not
be used.
MELTING POINT: The temperature at which a metal
begins to liquify.
INERT-GAS METAL-ARC WELDING (MIG): An arc
welding process in which fusion is produced by heating
MELTING RATE: The weight or length of electrode
with an electric arc between a metal electrode and the
melted in a unit of time.
work. Shielding is obtained from an inert gas such as
helium or argon. Pressure and/ or filler metal may or
METAL ARC CUTTING: The process of severing metals
may not be used.
by melting with the heat of the metal are.
INERT-GAS SHIELDED-ARC WELDING (TIG): An arc
METAL ARC WELDING: An arc welding process in
welding process in which fusion is produced by heating
which a metal electrode is held so that the heat of the
with an electric arc between a tungsten electrode and
arc fuses both the electrode and the work to form a
weld.
B-9
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