Bedienungsanleitung Kemppi A7 TIG Orbital System 150 (Seite 15 von 48) (Englisch)

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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.

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