Kemppi Minarc 150 VRD - Manual (Page 7)

© KEMPPI OY
MINARC 150 VRD / 0538 – 7
3.4. WELDING
Welding fumes may be dangerous to your health, see that there is ample
ventilation during welding!
Never look at the arc without face shield made for arc welding! Protect yourself
and your surroundings from the arc and hot spatter!
3.4.1. EARTHING
If possible, always fix earth cable clamp directly on the welding piece.
1. Clean connection surface of earth clamp from paint and rust.
2. Connect the clamp carefully so that contact surface is as large as possible.
3. Finally check that the clamp sits tight.
3.4.2. Welding
See also 3.1. Welding processes and 3.3 Welding selections. Note! It is recommended that
you try welding and rate of welding current first on something else than the actual work
piece.
You can start welding after having made the necessary selections. Arc is lit by scratching
the welding piece with electrode. Length of arc is regulated by holding electrode tip at a
suitable distance from welding piece. Suitable arc length is usually about half the diameter
of the electrode core wire. When arc is lit move the electrode slowly forwards tilting it to
appr. 10-15° pulling angle. If necessary, adjust current value.
Shielding gas is used in DC TIG welding. Your dealer will give you advice on choosing
gas and equipment. Open the gas valve on the TTM 15V TIG torch. When gas starts to
flow, arc is lit by lightly scratching work piece with the tip of the tungsten electrode. When
arc is lit, its length is regulated by holding the tip of the tungsten electrode at a suitable
distance from the work piece. Move the torch forwards from the starting point, usually in
appr. 10-15° pushing angle forwards. If necessary, regulate current rate. Stop welding by
lifting the torch off the welding piece and by closing the gas valve on the torch.
Note! Always fix the gas cylinder so that it stays steadily in upright position either in
specially made wall rack or cylinder trolley. Always close the cylinder valve after having
finished welding.
3.5. STORING
Store the unit in a clean and dry place. Shield it from rain, and in temperatures exceeding
+25 °C from direct exposure to sun.
4. MAINTENANCE
Be careful when handling electrical cables!
In maintaining the unit, take into consideration the rate of use and the environment it is
used in. When the unit is used properly and serviced regularly, you will avoid unnecessary
disturbances in use and production.