The fast pulse keeps the arc from wandering on low frequency's. The lower frequency's give a softer arc and the pulse just keeps it focused without making it harsh like the higher frequency's will, also average temperature of the arc will be reduced, so heat saturation will be less with pulse. The round aluminum parts I weld start with 130 amps and by the time I get all the way around them I am at 50 amps to keep the same bead width where they meet. That's without pulse and with pulse I start at 130 and end at 90 amps to have the same bead width.Originally Posted by sportbike
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