Advertisement
Appendix A
DROPLET
TRANSFER
•
From time T1 to T2:
•
From time T2 to T3:
•
From time T3 to T4:
•
From time T4 to T5:
•
After time T5:
PULSE WAVE SHAPING PRINCIPLES
FIGURE A-2. WELD DROPLET TRANSFER.
BACKGROUND AMPS
T
1
WELD
Background current maintains an arc, and a weld bead starts to
form.
Ramp-up current forms the weld droplet at the tip of the electrode.
Peak current and peak time separate the droplet and propel it
toward the weld surface. The arc width and transfer force are
controlled by peak current and peak time.
Tailout current controls the heat input to and agitation of the weld
puddle. Shorter tailout contributes less heat to the weld. (The level of
background current also affects the weld heat.)
The waveform repeats to start the weld droplet transfer process over
again.
EACH PULSE DELIVERS ONE DROPLET OF WELD MATERIAL
WAVE DESIGNER
PEAK AMPS
TAILOUT
T
T
T
2
3
4
A-3
SPRAY TRANSITION
CURRENT
T
5
27850028
27850029
Advertisement
