12
Select your required current by turning the
Welding Parameter Adjustment Knob.
Ensure the electrode/electrode holder is not
near the work-piece or can earth out, turn the
machine on using the mains power switch.
The front displays will light up and the cooling
fan will start.
5
6
Please see table on page 13 as a guide to
Welding Parameters.
7
Amperage Selection Guide
Rod Size/ Gauge
Welding Current
1.6mm
40-50 Amps
2.0mm
50-75 Amps
2.5mm
75-105 Amps
3.2mm
105-140 Amps
4.0mm
140-160 Amps
Average Metal Thickness
Electrode Size
1.0 - 2.0mm
2.0mm
2.0 - 5.0mm
2.6mm
5.0 - 8mm
3.2mm
8.0mm +
4.0mm
Note:
Pictures may vary from your machine model
STARTING THE ARC (SCRATCH)
The welding arc is obtained when the welding current is
forced across a gap between the electrode tip and the
workpiece. A welder must be able to strike and establish
the correct arc easily and quickly.
The scratching method is easier for beginners. The elec-
trode is moved across the plate inclined at an angle, as
you would strike a match. As the electrode scratches the
plate an arc is struck. When the arc has formed,
withdraw the electrode momentarily to form an
excessively long arc, then return to optimal arc length.
The optimal arc length, or distance between electrode
and puddle, is the same as the diameter of the
electrode (the actual metal part within the flux covering).
Holding the electrode too closely to the joint
decreases welding voltage, which creates an erratic arc
that may extinguish itself.
Summary of Contents for ST 141X
Page 1: ...DC INVERTER MANUAL ...
