Panasonic YC-300BP2YAF Operating Instructions Manual page 23


Pulse frequency
Applicable to the pulse "present" mode in AC or DC
welding.
It means the number of repeat times per second of the
combined waveforms of pulse current and welding
current (as shown in the following diagram as (1Hz)).

Pulse width
Applicable to the pulse "present" mode in DC TIG
welding or AC TIG welding.
With regard to the pulse frequency waveform, it is
obtainable from the following formula as the ratio
between pulse current width ("tp" in the right figure)
and the total value of pulse current width and welding
current width ("T" in the right figure).
Pulse width (%)=(tp / T)Å~100

AC balance
Applicable to AC TIG welding or MIX TIG welding.
(In the aluminum welding, the oxide film is removed at
the time of electrode plus.)
With regard to the AC frequency waveform, it is
obtainable from the following formula as the ratio
between waveform width at the electrode plus (DCEP)
side ("tep" in the right figure) and waveform width per
Hz ("T" in the right figure).
AC balance (%)=(tep / TÅf)Å~100
About "AC balance adjustment"
• The cleaning activity, which is imperative
for aluminum welding, exerts a consider-
able influence upon the quality of welding
including bead appearance, weld penetra-
tion and so on.
• In the following cases, expanding the AC
balance may make the welding operation
easier.
(a) In case welding have to be done with
the surface of base material contami-
nated,
(b) In case base material is coated with
a thick oxide film,
(c) When welding aluminum alloy,
(d) When welding surface-treated alumi-
num,
OMCTT5639E09
Electrode minus
(DCEN) side
(Waveform of AC standard TIG "without pulse")
<Variation of weld penetration and electrode wear
in relation to the AC balance.
AC balance Narrow
Penetration Deep
Electrode
Minor
wear
Names and Functions
Pulse current
Welding current
tp
Ｔ(1Hz)
Pulse frequency
Electrode plus
(DCEP) side
tep
Ｔ'
AC frequency
Wide
Shallow
Major
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