PATON
VDI-SERIES PRO
DC MMA/TIG/MIG/MAG
-17-
3.5. PROTECTION AGAINST ELECTRODE STICKING
At the stage of arc starting, the electrode can stick to the workpiece and, as a result, the
electrode can be damaged due to overheating.
If the electrode has stuck to the workpiece, the welding current decreases within 0.6 …
0.8 s after the sticking. In this case, the operator can detach the electrode from the
workpiece without risk to damage eyes because of random arc starting. After detachment
of the electrode, the welding can be continued.
3.6. SETTING THE SLOPE OF THE VOLT –AMPERE
CHARACTERISTICK OF THE WELDING UNIT
This function is designed to facilitate welding with electrodes with diverse coatings. By
default, the slope of the volt-ampere characteristic
[BAH]
of the welding unit is 1.4 V/A.
This value is optimal for the most common electrodes
AHO-23
and
MP-3
with rutile
coating. In order to facilitate welding with electrodes with standard coating (
UONI-
13/45
,
LK3-70
), it is recommended to set the slope of the volt-ampere characteristic
[BAH]
equal to 1.0 V/A. If electrodes with cellulose coating (TSTS-1, VSTS-4A) are
used, the slope of the volt-ampere characteristic should be 0.2 … 0.6 V/A. In this case,
it is sometimes required to increase the threshold
[u.AF]
value for the reduced-voltage
welding function to 18 V.
The procedure for changing the values of the operational parameters of the welding unit for the
current welding process is described in Section 6.1.
3.7. SHORT ARC WELDING MODE
This short arc welding mode should be used in overhead position welding, when it is
required to prevent arc stretching. For this purpose, activate
(ON)
the short arc welding
function
[Sh.A]
of the welding unit. By default, the function is deactivated
(OFF).
The procedure for changing the values of the operational parameters of the welding unit for the
current welding process is described in Section 6.1
.
3.8. REDUCTION OF OPEN – CIRCUIT VOLTAGE
When welding works with the manual arc welding process are being performed on
vessels, tanks, or other objects with higher requirements for electrical safety, it is
reasonable to use the reduction of open-circuit voltage function
[BSn].
When this function is enabled, the output voltage of the welding unit is reduced to the
safe value of
12 V
within
0.1 s
after the detachment of the electrode from the workpiece.
By default, this function is deactivated
(OFF),
as the reduction of open-circuit voltage
impairs arc starting.
The procedure for changing the values of the operational parameters of the welding unit for
the current welding process is described in Section 6.1.
