OPERATION | ||
|
|
|
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.
CAUTION
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”
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.
