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147
SLOT WELD
A weld made in an elongated hole in one member of a lap or tee joint
joining that member to that portion of the surface of the other member
which is exposed through the hole. The hole may be open at one end
and may be partially or completely filled with weld metal. (A fillet
welded slot should not be construed as conforming to this definition.)
SLUGGING
Adding a separate piece or pieces of material in a joint before or during
welding with a resultant welded joint that does not comply with design
drawing or specification requirements.
SOLDERING
A group of welding processes which produce coalescence of materials
by heating them to suitable temperature and by using a filler metal
having a liquidus not exceeding 450 °C (842 °F) and below the solidus
of the base materials. The filler metal is distributed between the closely
fitted surfaces of the joint by capillary action.
SOLIDUS
The highest temperature at which a metal or alloy is completely solid.
SPACER STRIP
A metal strip or bar inserted in the root of a joint prepared for a groove
weld to serve as a backing and to maintain the root opening during
welding.
SPALL
Small chips or fragments which are sometimes given off by electrodes
during the welding operation. This problem is especially common with
heavy coated electrodes.
SPATTER
The metal particles expelled during arc and gas welding which do not
form a part of the weld.
SPOT WELDING
A resistance welding process in which fusion is produced by the heat
obtained from the resistance to the flow of electric current through the
workpieces held together under pressure by electrodes. The size and
shape of the individually formed welds are limited by the size and
contour of the electrodes.
SPRAY TRANSFER
A type of metal transfer in which molten filler metal is propelled
axially across the arc in small droplets.
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