Lincoln Electric Power Wave AC/DC 1000 Brochure page 3

W A V E F O R M C O N T R O L
AC/DC Submerged Arc Welding
Using AC/DC
The AC/DC SAW process is the ideal choice for
high-deposition, high-speed welds that can be made in
the 1G position. Whether your applications demands a
single arc or up to five synchronized arcs, AC/DC SAW
with the Power Wave will increase weld speeds and
yield higher quality welds.
In multiple arc welding, as many as 5 arcs operate in a
single weld puddle. The positive and negative polarity
phases of the AC waveform can be independently
adjusted, as well as the cycle balance. Changes to the
combination of any of these values will change the
deposition rate, penetration, and travel speed, without
changing the voltage or current settings.
Typical DC-AC two-arc combinations can be replaced
with AC/DC Power Waves for either AC/DC or AC/AC
welding applications.
How
AC/DC Submerged Arc Works in a Multi-Arc Environment
When more than one arc is present, arc interaction plays an important role in the behavior of the weld. Two
positive electrodes pull together because their magnetic fields attract each other. Two negative electrodes also
pull together. One negative and one positive electrode repel or push against each other. By phase shifting the AC
waveforms the amount of "push" and "pull" of the arc interaction can be balanced. This is the reason multi-arc
processes use alternating current to minimize arc blow.
500
0
-500
In this example, both electrodes are either always
positive, or always negative, causing a constant
"pull". Constant "pulling" will lead to arc blow,
penetration, and bead appearance problems.
T h e f u
T E C H N O L O G Y
t u r e o f
®
500
0
-500
Similar to the way a single arc process allows operator
flexibility through manipulation of the waveform, the dual arc
process is controlled by shifting the phase of the waveform.
In the above waveform, the amount of time that both
electrodes are positive is balanced with the amount of time
that one is positive and one is negative.
w e l d i n g i s h
PROCESS
3/6
®
e r e .