PATON
VDI-SERIES PRO
DC MMA/TIG/MIG/MAG
-20-
WARNING!
Use a gated welding torch with a 9 mm (VDI-160P) or 13
mm (VDI-200P and VDI-250P) bayonet connector. Select the maximum
current of the welding torch according to the specifications.
WARNING!
Do not sharpen the electrode tip to a needle-like
shape, as such a shape can cause deviation of a welding arc from
side to side. The properly sharpened electrode tip should have a
slightly blunted end with a diameter corresponding to the specified
welding current. In welding with a large welding current, the high-
sharpened electrode easily melts due to insufficient heat dissipation.
The sharpening marks should be arranged along the electrode
centerline.
4.2. OPERATIONAL CYCLE OF THE ARGON ARC WELDING
PROCESS WITH TIG – LIFT FUNCTION
The procedure for changing the values of the operational parameters of the welding unit is
described in Section 6.1
.
4.3. TIG-LIFT CONTACT ARC-STARTING FUNCTION
This function is set by default and is designed for welding torches with contact arc
starting, without using oscillators and other like devices. In contrast to conventional
methods of arc starting, the contact arc starting prevents the formation of current surge at
the instant of time of arc starting. As a result, disintegration of the nonconsumable
tungsten electrode and ingress of the electrode particles into the weld can be prevented.
When this function has been activated, contact the electrode with the workpiece. It is
allowed to hold the electrode in this position for an unlimited length of time. When the
operator is ready to welding (for example, when the operator has lowered the protective
shield and purged the weld area with gas), it is necessary to lift the electrode tip slowly
from the workpiece. The welding unit will sense this action as a signal to start welding,
and the welding current will be linearly increased to the set value. To prevent surface
melting of the electrode tip, the rate of lifting the electrode should correspond to the set
welding current value. The period
[t.uP]
of linear current rise is discussed in Section 4.4.
I (A)
t, s
