Lincoln Electric SAM400 - Manual (Page 15)

B-4 OPERATION B-4
Set the welding current and voltage as described under
“Constant Voltage Welding” above.
Variable Voltage Welding
The SAM400 “Current Control” provides the major
adjustment of current. It has two calibrated scales; the
one gives maximum and the other minimum current
available at any given setting.
DO NOT ADJUST THE “CURRENT CONTROL”
WHEN WELDING.
The SAM650 “Tap” lead inside the machine and the
series of five “Sub Arc & Stick” studs provide the major
adjustment of welding current. Generally connect the
“Tap” lead to the stud with the lowest current range that
still provides the desired current.
The “Variable Voltage Control” to the left of the name-
plate on all models is both the open circuit voltage con-
trol and a fine adjustment. The wire feeder current con-
trol and the “Portable Field Control” provide the same
function as the “Variable Voltage Control.”
To Set The Controls -- Stick Welding
a. Make the coarse setting of welding heat with the
SAM400 “Current Control” or the SAM650
“Tap’”lead.
b. Adjust for the desired arc characteristics with the
“Variable Voltage Control”. For a soft arc desired
for most welding keep this control between 7 and
High. For a more digging arc, set it lower.
c. If remote control is NOT desired leave the
“Portable Field Control” on “High”. For remote con-
trol, leave the “Variable Voltage Control” near
“High” and make the adjustments described in
paragraph “b” above with the “Portable Field
Control”.
Remember, increasing either the
“Variable Voltage Control” or “Portable Field
Control” setting also increases the current.
To Set The Controls -- Submerged Arc
a. The open circuit voltage (OCV) is generally not
critical in submerged arc welding. Therefore, the
“Variable Voltage Control” can usually be left
between 7 and “High” -- no future adjustments are
needed.
b. Set SAM400 “Current Control” so the calibration
on the higher scale is a little above the current
desired. Set the SAM650 “Tap” lead to the stud
with the lowest current range that still provides the
desired current.
c. Make the final current adjustment with either the
wire feeder current control or the “Portable Field
Control”. Set the arc voltage with the wire feeder
control.
Consult the following illustrations for examples of how
to set the machine.
SAM400 & 650
CAUTION