Operation Manual

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A5 TIG Orbital System 75© Kemppi Oy 2016 1615
OPERATING MANUAL
3.5.11 Preparing welding – test weld
1. Power On: Turn on the power of the power supply
and the controller.
2. Weld Head: Clamp the weld head on the workpiece
3. Purging the Head: Purge the gas hose and chamber
of the weld head by pressing the icon on the power
supply. The icon changes from black to green when
gas is owing.
Purge the weld head and gas line for approximately ten
(10) minutes prior to the start of welding per shift.
4. Purge the tube ID in preparation for welding.
Welding stainless steel requires purging.
Isolating the weld root
Isolate the weld root by means of dams or other suitable
containment devices. Purging requires openings through
which the purging gas can enter and exit the weld joint
area at controlled rates. The gas inlet should be located
lower than the exit opening to prevent entrapment of air.
Preventing excessive pressure
Provisions for an adequate vent or exhaust are important
to prevent excessive pressure buildup during welding. The
size of the exit port should be equal to or greater than the
size of the entry to prevent an increase in the gas pressure.
If the weld joints are pre-tacked in larger assemblies,
you may need to tape each unwelded joint to prevent
excessive loss of purge gas.
Purge ow rate
The purge ow rate is based on volume to be purged. A
general rule of thumb is to purge at ow rates and times
that will produce ve to ten system volume changes prior
to welding. The recommended maximum ow rate is a
function of the volume and shape to be purged. Typically,
the purge rate should not exceed 40 l/minute.
5. Load a Program: Select appropriate weld program
as described in section Program storage. The red
LED on the handle next to the Home position
ignites. If not, press Home. The rotor rotates until
Start position is reached, and the LED ignites. See
weld head operation panel above in this manual.
Do not start the weld head if it is out of its Home
position. Once the rotary gear is out of its Home position, it
is exposed to the walls of the chamber and collets that are
at work return potential. In rare cases this can create an arc
over so that welding current occurs between rotating gear
and housing.
6. Completion of the Weld: Autorewind function
rotates the rotor into “open throat” position to
allow the weld head to be removed. If the weld is
not completed, press Home to rotate the rotor to
the correct position to allow the weld head to be
removed from the workpiece.
7. Remove the weld head: Open both sides of the
hinged collet frame and remove the weld head
from the workpiece.
8. Inspect the Test Weld : Visually inspect the test
weld. If the weld is incompletely penetrated or
lacks adequate bead width, adjust the weld current
(amperage) upward.
a. Press the Amperage +/- button.
b. Increase the amperage by a small percentage.
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