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144
PULSATION WELDING
A spot, projection, or seam welding process in which the welding
current is interrupted one or more times without the release of pressure
or change of location of electrodes.
PUSH WELDING
The making of a spot or projection weld in which the force is aping
current is interrupted one or more times without the release of pressure
or change of location of electrodes.
PUSH WELDING
The making of a spot or projection weld in which the force is applied
manually to one electrode and the work or a backing bar takes the
place of the other electrode.
QUENCHING
The sudden cooling of heated metal with oil, water, or compressed air.
REACTION STRESS
The residual stress which could not otherwise exist if the members or
parts being welded were isolated as free bodies without connection to
other parts of the structure.
REDUCING FLAME
See CARBONIZING FLAME.
REGULATOR
A device used to reduce cylinder pressure to a suitable torch working
pressure.
REINFORCED WELD
The weld metal built up above the surface of the two abutting sheets or
plates in excess of that required for the size of the weld specified.
RESIDUAL STRESS
Stress remaining in a structure or member as a result of thermal and/or
mechanical treatment.
RESISTANCE BRAZING
A brazing process in which bonding is produced by the heat obtained
from resistance to the flow of electric current in a circuit of which the
workpiece is a part, and by using a nonferrous filler metal having a
melting point above 800 °F (427 °C), but below that of the base metals.
The filler metal is distributed in the joint by capillary attraction.
RESISTANCE BUTT WELDING
A group of resistance welding processes in which the weld occurs
simultaneously over the entire contact area of the parts being joined.
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