Removing Seams; Bolt And Rivet Cutting; Hole Piercing; Heating - Craftsman 113.201892 Owner's Manual

BOLT AND RIVET CUTTING
MOVe e OoUr ANO:--_ ....
OOWN VERTICALLY : _: .._o '>- ""
-_ f,_._ Removing rusty bolts Or rivets isan easy iob with an electric
_:: : ,_ arc welder. The arc is struck on the head or nut of the bolt
i: ":" _ and worked around in a slight circular movement until the
_ ___,, __:I,_°_- .... _ head is completely melted off. (fig. 4). A punch is then
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"_ _L- t START
CUT
HERE
Used to drive out the remaining part. The bolt or rivet can
be removed by heating the head almost to the melting point,
then quickly shearing it off with a cold chisel. Care must be
taken not to cause the bolt to become welded to the metal.
HOLE PIERCING
Figure 2
TO make a trial cut, place a bar of steel approximately
1/4-inch thick on the table so that one end projects over
the edge. Use a 3/32-inch rod and a current setting of
around 140 amperes. Hold the rod as shown in figure 1 and
strike an arc on the top corner at the edge of the bar where
the cutis to be made. Feed the rod into the molten puddle
and keep the crater burning through as the rod is moved
across the bar. To catch the molten metal, place a meta_
container on the floor directly under the cut.
when cutting metal heavier than 1/4-inch, the arc is started
atthe bottom €orner and worked Up and down vertically
aslshown in figure 2, advancing: the bottom of the cut
slightly ahead of the top Of the cut to permit molten metal
to run out more easily_ Ira smooth edge is desired, the
pieces carl be ground on an abrasive wheel Electrodes
designed especially for cuttir_g mc_y also be used.
REMOVING:SEAMS
In addition to cutting; the electric weldlng arc can be used
for beveling the edges of material to be welded, gouging
out cracked welds for rewelding or removing tack_welds.
The surface of the metal being worked Upon should be ap-
proximately in the vertical position; or tipped slightiy toward
t_e arc (fig. 3). Start atthe bottom Ofthe:seam to b_ gouged
out and Work upward; The rate of speed Will depend Upon
the depth of the groove and the am0untof metal removed.
Another useful application of the welding arc is piercing
holes in metal. Coated metallic electrodes are best for
this purpose because of their small size and insulation
afforded by the coating. The process is extremely fast and
a surprisingly clean circular hole can be made. For practice,
place a piece of scrap iron 1/4-inch thick (or less) on the
table and altow it to proiect over the edge as for arc
cutting. Use a 3/32-inch rod and the same current as for
cutting. At the place where the hole is to be pierced, strike
an arc and hold it until a molten puddle is formed. Then
push the electrode down against the molten puddle and
force it through the plate. ]t is possibleto hold the electrode
against the melted plate because the metal core meffs off
faster than the coating. The coating (not the rod) touches
the molten metal (fig. 5), The gap maintained by the pro-
truding coating prevents the metal core of the electrode
from sticking or freezing to the plate.
If a larger diameter hole is desired, first pierce a hole as
described. Then, holding a fairly long arc, melt the edges
of the hole away by moving the rod around it (fig. 6). Holes
of almost any diameter can be mode. To pierce a hole
through material thicker than 1/4-inch, work from the
Onderside.
HEATING
The carbon arc provides a convenient method for localized
heating of all metals. Simply strike an arc on the part to be
heated and "play'" it across the surface until the required
temperatbre is reached.
Figure 3
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Figure 5
Figure 6
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