Thermal Arc PRO-WAVE 300 TSW, Service Manual, Page: 43 / 110

PRO-WAVE 300TSW
August 10, 2005
4-13
F. Pulse Controls
(Pulse Width)
(Pulse Frequency)
(Peak Current)
(Base)
Background
Current
Art # A-05534
Figure 4-7: 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) 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 stays 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.