Tweco 185TSW DC CC - Manual (Page 36)

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6.02.03 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.
6.02.03 Pulse controls continued
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)