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Kemppi A7 TIG Orbital System 150 Manual

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A7 TIG Orbital System 150© Kemppi Oy 2016 1615
OPERATING MANUAL
3.5 Preparing for welding
1. Turn the power supply ON.
2. Clamp the weld head on the workpiece.
3. Purge the gas hose and chamber of the weld head
using the purge button on the power supply. Purge
the weld head and gas line for approximately ten
(10) minutes prior to the start of welding each shift.
4. Purge the tube ID in preparation for welding with
backing gas.
5. Load the appropriate weld program number as
described in the power supply manual. The red LED
on the handle next to the Home position ignites.
If this does not occur, press the Home button. The
rotor rotates until Start position is reached, and LED
ignites. Press the Start Weld button.
Do not start the head if it is out of its Home position
because it is then exposed to the walls of the chamber and
collets that are at work return potential. While welding, the
arc voltages are so low as to have no consequences, but
during the start sequence having the gear partially exposed
may cause misre. In rare cases this can create an arch-over,
allowing the follow on welding current to establish between
the rotating gear and the housing. This will only happen
if at the same time the tungsten-to-workpiece-to-collet
conductivity is poor due to oxidation or contaminated from
machining operations, primarily lubricants.
6. At the completion of the weld the auto rewind
function rotates the rotor into "open throat"
position to allow the weld head to be removed.
If you do not use this function, press the Home
button once again. The rotor rotates into correct
position to allow the weld head to be removed
from the workpiece.
7. Open both sides of the hinged collet frame and
remove the weld head from the workpiece.
3.5.1 Preparing the workpiece
For successful fusion welding, do the following:
1. Ensure that the tube ends (or ttings) are machined
square relative to their axis.
2. Place the two ends butt-tight together.
3. Leave no gap between the tube ends resulting
from lack of squareness or burrs left from the
machining process.
4. Once the tube end is faced o, check for burrs. Any
burrs must be carefully removed with a hand-held
deburring tool.
5. If the tube wall thickness variation exceeds 10%,
use chamfer cut of 5° on the inside of the tube
ends.
After the tube has been machined, it must be properly
cleaned using the following procedure:
1. Wipe the tube end with a lint-free towel dipped in a
solvent, such as acetone or denatured alcohol, and
immediately wipe with a second clean cloth before
the solvent dries. Use an abrasive cloth to remove
any surface oxides or contaminants. Clean the tube
end back to approximately 12 mm.
2. Repeat the cleaning operation. Ensure that tube’s
inner diameter is similarly cleaned.
… 15 …


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