Century OM-117071002 Operator's Manual page 20

VERY thin or excessive filler metal
build-up and minimal penetration is
acceptable•
Always select the HIGH heat setting with
the burn-through method prior to making
a spot weld.
2• The PUNCH AND FILL METHOD
produces a weld with the most
finished appearance of the three
spot weld methods. In this method,
a hole is punched or drilled into the
top piece of metal and the arc is
directed through this hole to
penetrate into the bottom piece.
The puddle is allowed to fill up the
hole leaving a spot weld that is
smooth and flush with the surface of
the top piece.
Select the, heat setting, as if you were
welding the same thickness material
with a continuous bead.
3. The LAP SPOT METHOD directs
the welding arc to penetrate the
bottom and top pieces, at the same
time, right along each side of the
lap joint seam.
Select the heat setting as if you were
welding the same thickness material
with a continuous bead.
SPOT WELDING INSTRUCTIONS
•
Select the heat setting
recommended above for the
method of spot welding you intend
to use.
.
.
Hold the nozzle piece completely
perpendicular to and about 1/4 inch
off the work piece•
Pull the trigger on the gun and
release it when it appears that the
desired penetration has been
achieved.
.
.
Make practice spot welds on scrap
metal, varying the length of time
you hold the trigger, until a desired
spot weld is made.
Make spot welds on the actual work
piece at desired locations.
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