Manual Kemppi A7 TIG Orbital System 300 (page 16 of 61) (English)

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A7 TIG Orbital System 300© Kemppi Oy 2016 1615

OPERATING MANUAL

2.7 Electrode

Almost all welding can be done with the tungsten electrode

ground to a 30° included angle. The tungsten electrode

should have a 0.15 mm at to avoid tungsten "spitting".

The greater the included angle of the tungsten, the greater

the penetration capability. Changing the included angle

also aects weld bead width. Oscillation width needs to

be changed accordingly. See recommended tungsten

electrode geometry.

If tungsten electrode is sharpened at both ends, you

can change direction after one end has worn o.

0.1 mm

0.15 mm

30° inc. both ends

38 mm

To select a suitable electrode for the welding application

and a suitable collet for the electrode:

1. Insert the electrode through the collet and collet

body.

2. Screw the body into the torch with the large end of

collet upwards.

3. Ensure that the electrode extends to correct length

without ceramic gas nozzle touching the pipe

surface.

4. Tighten collet body with torch back-cap (minimal

torque).

5. Use the adjustment screws to set the correct torch

angle and position.

For most applications, the torch centreline should pass

through the centre line of the pipe.

Replace the torch back cap with a back cap plug for

minimal radial clearance:

1. When you use the back cap plug, use collet wrench

(supplied in the tool kit) to clamp the tungsten

electrode in the torch.

2. Engage the "ats" of the collet around the "ats"

of the collet body and rotate. Do not use excessive

force.

3. Install the gas cup.

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Kemppi A7 TIG Orbital System 300 Manual

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