Lincoln Electric WAVE DESIGNER IM649 Operator's Manual page 47

Appendix A
A.5.2 FREQUENCY
Frequency, Figure A-7, is the number of pulses per second or, in theory, the number of weld
droplets per second. Since increasing the frequency generates more pulses in a given time
period, higher frequencies generate higher average current levels.
BACKGROUND
CURRENT
BACKGROUND
CURRENT
A.5.3 BACKGROUND CURRENT
The background current, Figure A-7, is set to maintain a desired plasma arc between weld
droplet transfers and to control the heat input to the weld system.
PULSE WAVE SHAPING PRINCIPLES
FIGURE A-7. FREQUENCY.
AVERAGE
CURRENT
T
1
LARGER
DROPLETS
SHORTER
ARC
AVERAGE
CURRENT
T
1
SMALLER
DROPLETS
LONGER
ARC
WAVE DESIGNER
T
2
T
2
A-15
T
3
T
3
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