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PART TWO - INSTRUCTIONS
T-964C
nuts
with
a
slight
pressure,
to
insure
a
good
electrical
contact,
CAUTION!
DO
NOT
twist cables or use a hammer to tighten or loosen connections.
b.
Attach the ground cable to the work metal making certain that the connection
is
clean
and
secure.
Insert
an
electrode
in
the
electrode
holder.
If
an
electrode
requiring'
straight
polarity
has
been
inserted,
the
standard
'Pipeliner
is
now
con
nected
for
welding.
On
the
standard
'Mainliner'
the
polarity
switch
must
be
placed
in
the
'UP'
or
'STR'
position. If
an
electrode requiring
reverse polarity is to be
used,
the
terminal
connections
on
the
'Pipeliner'
must
be
reversed,
while
on
the
'Mainliner* it is necessary only to place the polarity switch in the 'REV' or 'DOWN'
position.
c. Set the multi-range switch on position 1 and adjust the field rheostat to its
maximum position. (Turning the field rheostat clockwise increases the welding cur
rent and open circuit voltage, while turning it counter-clockwise decreases the
welding current and open circuit voltage). When the rheostat is in this position,
the voltmeter should indicate an open circuit voltage of between 75 and 95 (see par.
13 b) volts while the welder is running under no load,
d. Start the engine and check for its proper operation.
23, GENERAL OPERATION
a. Check that the open circuit voltage is between 75 and 95 volts (see par. 13b)
when the rheostat is in the max. position.
b. Strike an arc to begin welding. If the setting of the multi-range switch in
position 1 is too low, select the lowest range possible and then make fine adjust
ments with the field rheostat until the desired current is obtained. In setting the
multi-range switch, be certain that the arrow on the switch coincides with the arrow
on the control panel. A detent stop indicates when the switch is in the correct
position.
c. Approximate ampere ratings of each range are given in the following chart.
Multi-Range
Switch Setting
Field
Rheostat
Min.
Set At
Max.
1
25
65
2
65
115
3
90
215
4
165
320
5
290
360
Current values shown above are related to 25 volts across the arc, corresponding
to that used with a medium coated electrode. When using heavily coated or carbon
electrodes, or when using extra long cables, the values in the table are proportion
ately reduced, due to the higher voltage drop involved.
d. Before stopping the engine, the welding cables should be disconnected from
the load, along with any auxiliary load on the outlet receptacles.
15
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