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139
INERT GAS
A gas which does not normally combine chemically with the base
metal or filler metal.
INTERPASS TEMPERATURE
In a multipass weld, the lowest temperature of the deposited weld meal
before the next pass is started.
JOINT
The portion of a structure in which separate base metal parts are
joined.
JOINT PENETRATION
The maximum depth a groove weld extends from its face into a joint,
exclusive of reinforcement.
KERF
The space from which metal has been removed by a cutting process.
LAP JOINT
A joint between two overlapping members.
LAYER
A stratum of weld metal, consisting of one or more weld beads.
LEG OF A FILLET WELD
The distance from the root of the joint to the toe of the fillet weld.
LIQUIDUS
The lowest temperature at which a metal or an alloy is completely
liquid.
LOCAL PREHEATING
Preheating a specific portion of a structure.
LOCAL STRESS RELIEVING
Stress relieving heat treatment of a specific portion of a structure.
MANIFOLD
A multiple header for connecting several cylinders to one or more
torch supply lines.
MARTENSITE
Martensite is a microconstituent or structure in quenched steel
characterized by an acicular or needle-like pattern on the surface of
polish. It has the maximum hardness of any of the structures resulting
from the decomposition products of austenite.
MASH SEAM WELDING
A seam weld made in a lap joint in which the thickness at the lap is
reduced to approximately the thickness of one of the lapped joints by
applying pressure while the metal is in a plastic state.
MELTING POINT
The temperature at which a metal begins to liquefy.
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