MasterWeld 200 AC/DC Manual De Instrucciones página 12

• L3: Welding current.
• L4: Second welding current in Bi-level TIG mode.
When the torch key is quickly pressed and released (less
than 0.5 seconds) while welding, the welding current
value is brought from the one set in the "welding current"
parameter (L3) to the one set through this parameter.
• L5: Base current in slow or fast pulsed TIG mode.It
is the minimum current of the pulsed wave; when it is
increased, the welding bath is created more quickly but
also the heat input to the material and the heat altered
zone increase.
• L6: Peak time. It is the time in which the pulsed wave
is at the welding current compared with the total time of
the pulsation cycle (t2+t3).
• L7: Base time. In the slow pulsed TIG mode, LED's L6
and L7 have the above function (base time), while in the
fast pulsed TIG mode, they are lit together and the
display shows the pulsed frequency.
• L8: Slope-down time. This makes it possible to set a
time in which the current is taken from the welding current
to the final current.
• L9: Final current. (The CRATER FILLER CURRENT
function has been provided in the four-stroke process
only).This is the current the welder is taken to at the end of
the welding process. In the four-stage applications there is
a CRATER FILLER CURRENT function (in the third stage)
that permits an optimal crater closure time.
• L10: Post-gas time. This determines the gas emission
time once the welding arc is off.
• L11:
Inversion frequency in TIG AC. (Only
AC TIG).To reduce the noise from the electric arc,
harmonic frequencies have been selected.
This determines the frequency with which the weld
current passes from DC+ to DC- and vice versa.
The picture below shows the example where the wave on
the second graph has a double frequency compared with
the first. High inversion frequency values favour a greater
concentration of the arc with a smaller heat altered zone.
MASTERWELD 200 AC/DC
• L12:
TIG).Displaying of a positive or negative value referring
to the positive wave in the TIG AC mode.
A negative value indicates greater penetration and fusion
of the electric arc in the weld bath with less cleaning of
the piece, while a positive value indicates greater
cleaning of the electric arc over the weld bath but with
lower penetration.
The following figure shows two graphs with different
balance value: the first graph represents the curve of the
current with a negative value balance (more penetration)
in which it can be seen that there is a low percentage of
positive wave compared with the negative.
In the second graph the current curve is shown with a
positive value balance (more cleaning); in this case the
percentage of the positive wave is greater than the
negative one.
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Balance value in TIG AC. (Only AC
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