Tweco 300 ACDC Arcmaster - Manual (Page 38)

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6.05 Pulse Controls
The Pulse controls are used primarily to control heat input. Pulse offers a number of advantages
as follows:
1) Control puddle – size and fluidity (especially out of position).
2) Increase penetration
3) Travel speed control
4) Better consistent quality
5) Decreased distortion on lighter or thinner materials.
Pulse-current provides a system in which the welding current continuously changes between two levels. During the
periods of Peak current, heating and fusion takes place, and during the background (base) current periods, cooling
and solidification take place. Pulse Width is the time in one cycle the current remains at the peak current setting.
Pulse Frequency, measured in Hertz, is the number of cycles per second the current travels between peak and
background current settings. It is as if the foot rheostat were moved up and down to increase and decrease the
welding current on a regular basis. The faster you moved the foot rheostat up and down the faster the frequency.
(Peak Current)
(Base)
Background
Current
(Pulse Width) (Pulse Frequency)