31
Figure 4.2.2 - Connecting Spool-On-Gun to Services
4.2.3.1 ANTI-STICK WELDING OPERATION
Anti-Stick feature provides a time delay at the end of a weld
from the time the torch trigger is released until the main
contactor is deenergized. This delay allows the welding
wire to burn back, away from the work, so it won’t “stick”
in the weld puddle.
This delay time, controlled by the “anti-stick” potentiometer,
is variable from approximately 0.05 seconds to 0.5 seconds.
The required delay time generally depends on the WIRE
SPEED Adjustment setting on the front panel - the higher
the setting, the faster wire will feed into the weld, and the
more delay time will be required.
If, when using the Anti-Stick feature, the welding wire tends
to stick in the puddle at the end of a weld, the Anti-Stick
time should be increased; if, on the other hand, the wire
burns back into the torch tip, the anti-stick time should be
decreased. Setting the anti-stick time to “Min” eectively
cancels the anti-stick feature.
This Anti-Stick feature is available for all three welding
modes - Continuous, Spot, and Stitch.
4.2.3.2 CONTINUOUS WELDING MODE
OPERATION
A. Place the three-position toggle switch in “Continu-
ous” weld mode (center position) for mig seam
welding.
B. Set the “Anti-Stick Time” as required (see 4.2.3.1).
MT-250SG Requires
Adapter 36833
IMPORTANT -- Always make sure that the plastic plug is
screwed back into the adaptor when the ST-23A gas/
power cable is disconnected, because shielding gas
will escape from the adaptor unless the gas cylinder
is shut o.
D. Connect the 250’s WORK cable to the workpiece.
E. Set Migmaster 250 voltage tap switches to RANGE
and FINE ADJUSTMENT VOLTAGE settings desir- ed.
F. Turn on the Migmaster 250’s power switch and
begin seam mig welding.
If the optional Spot/Stitch/Anti-Stick control module is in-
stalled, the MT-250SG and the ST-23A gun may be operated
using these optional features, see Section 4.2.3.
4.2.3 OPTIONAL SPOT/STITCH/ANTI-STICK
CONTROL MODULE
This optional control module allows the operator to use the
250 for Spot or Stitch or Continuous welding operations.
It also includes an adjustable Anti-Stick feature to select
various burnback times to prevent wire from sticking in the
puddle after a weld.
The module consists of three pots (one for Spot-Stitch Weld
Time "ON", one for Stitch Weld Time "OFF", and one for Anti-
Stick Time modes) and one three-position toggle switch to
select the welding operation desired (Spot, Continuous or
Stitch). For installation, see Section 3.9; for operation, see
following:
SECTION 4 OPERATION
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