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User Manual
250
i
Ω
MEGA
• Select Short from the Pre-Weld Delay row.
• Press the Pedal Button, and toggle the Weld On.
• Attach the negative alligator clip to one workpiece
and the positive alligator clip to the other work-
piece. See Figure 42.2.
• Lightly touch the two workpieces together where
you want to tack them. See Figure 42.2. Too much
pressure will result in a cooler weld, which can
weaken the tack strength or result in an unsuc-
cessful tack weld. Too little pressure can result in a
hotter weld, and can cause arcing between the two
surfaces and lead to sparks or poor tack quality.
• Step on the foot pedal to initiate the weld process.
After the short weld delay, energy will discharge
and the weld will occur. Try to maintain even pres-
sure throughout the weld process.
• If the workpieces stay together, proceed to the
Arc screen to perform a permanent weld using the
Pulse Arc Welding Stylus. If the pieces do not stay
together adjust the Energy Slider up and repeat.
Finding the Right Settings
Several different factors can influence the way the welder
will behave for any given combination of settings (i.e. types
of metal being used, thickness of metal, geometry of the
workpieces, gaps between mating surfaces, electrode size
and shape, gauge of ground wire, argon coverage, etc.). For
these reasons, it can be important to experiment and get to
know the proper settings for your specific applications.
To fine tune the results and maximize weld quality, it can be
extremely helpful to make use of the many configurations
the Sunstone PA250i has to offer. Although it can be intim
-
idating to experiment with new technology, “playing” with
weld parameters on the Sunstone PA250i can be a fun, edu-
cational experience, and can lead to a better understanding
of welding varied applications.
Figure 42.2. To utilize the welder’s Tack mode
feature, touch the Tack Button. Make sure alligator
clips or other cables are attached to the Tack
Terminal on the rear of the Power Supply. Select
the desired power and delay settings. Adjust the
energy level as needed. If you are using a pedal
to initiate the weld, touch the Pedal Button; Make
sure the Weld On Button is on.
Figure 42.2. In Tack mode, simply touch the two
workpieces together to initiate the weld, as shown
in the example above.
