Dc Tig Welding; Earth Return Cable And Clamp; Tungsten Inert Gas Welding (Tig) - Kemppi Evo 150 Operating Manual

weld joint. Filler wire is fed into the weld pool from the outside of the arc and gas shield. The
filler wire and the welding current level are decided according to the base material type and
thickness, joint form and welding position.
Ensure you protect your eyes and face with suitable equipment.
NOTE!
The tungsten electrode tip should be sharpened as described.
NOTE!
EN

3.3.1 DC TIG welding

Select your required welding parameters according to the joint to be welded.
1. Connect TIG torch to the negative (–) pole of the power source, and earth cable to
positive (+) pole.
2. Select TIG welding mode by pressing the process selection button on the control panel.
3. Select a suitable welding current by adjusting the current adjustment knob.
4. Ensure your argon shielding gas supply is switched on and the flow rate is approximately
8 to 10 litres per minute.
5. Make a small test weld to check the selections made.

3.3.2 Earth return cable and clamp

If possible, always fix the earth return cable and clamp directly to the work piece.
1. Clean the connection surface of earth clamp from paint, dirt and rust.
2. Connect the clamp carefully so that contact surface is as large as possible.
3. Finally check that the clamp remains fastened.

3.3.3 Tungsten inert gas welding (TIG)

Argon shielding gas is used in DC TIG welding. Your dealer will give you advice on choosing
the correct gas, supplier, and supporting equipment. Open the gas valve on the Kemppi
TTM 15V TIG torch. When the gas starts to flow, ignite the arc. The arc is activated by lightly
touching the work piece with the tungsten electrode and lifting away. A reliable technique to
practice is, lightly and briefly touch the tungsten electrode to the work piece surface and then
rock backwards onto the ceramic nozzle of the TIG welding torch, so the tungsten is no longer
in contact with the work piece surface. This action makes and breaks a momentary contact of
the tungsten electrode in a controlled manner, first making the electrical circuit and secondly
establishing the TIG welding arc the moment the tungsten leaves contact to the work piece
surface.
10
0.5 s
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