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12.6 AC Pulsed Argon Arc Welding
Current Change Waveform of AC Pulsed Argon Arc Welding
Note: tc- Current clearing time.
tp - AC cycle
Tp - Pulse peak time
T - Pulse cycle
tu - Upslope time
td - Downslope time
Ip - Peak current
Ib - Base current
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AC frequency (1/tp): Adjusted according to process requirements.
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Pulse frequency (1/T): Adjusted according to process requirements.
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Duty cycle (100%*Tp/T): Adjusted according to process requirements.
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Clearing width (100%*tc/tp): Adjusted according to process requirements.
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AC pulsed argon arc welding has square waves, triangle waves and sine waves. They are only different in output
waveform. The AC pulsed argon arc welding is basically the same as the AC square wave argon arc welding. The
difference is that the welding current is controlled by a low frequency pulse, so that the welding current changes
with the pulses to form the peak and base current, and the set peak and base currents are also the peak (average)
and base (average) of the low frequency pulse.
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In AC pulse mode, the range of pulse frequency is affected by AC frequency and frequency division factor. The
minimum frequency division factor is 10, and the maximum is 2 times the AC frequency. The pulse frequency
range is 0.5 Hz to AC frequency/10 Hz. You can choose any frequency in the range. When the AC frequency
changes, the AC frequency/actual frequency of current pulse is equal to the frequency division factor and
updated. When the frequency division factor is determined, the current AC frequency/frequency division factor is
equal to the actual frequency of the current pulse and stored so as to maintain the pulse frequency unchanged.
Once the AC frequency and the pulse frequency are set, the frequency division factor is determined, that is, the
AC frequency divided by the pulse frequency. For example: When the AC frequency is set to 100Hz, the pulse
frequency range is 0.5~10Hz. When the AC frequency is set to 100Hz and the pulse frequency is 5Hz, the current
Summary of Contents for TIG315PACDC(E202)
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Page 62: ...61 19 3 List of parts available for repair ...
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