OPERATION | ||
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MULTIPLE ARC SYSTEM
CONSIDERATIONS
Large scale SAW applications often employ multiple arcs to increase deposition rates. In multiple arc sys- tems, magnetic forces created by like and opposing weld currents of adjacent arcs can result in arc inter- action that can physically push or pull the arc columns together. To counteract this effect, the phase relation- ship between adjacent arcs can be adjusted to alter- nate and equalize the duration of magnetic push and pull forces. This is accomplished by the use of an optional
BASIC MODES OF OPERATION
CONSTANT CURRENT (CC)
•Operator presets Current and desired Voltage.
•The Power Source:
-Goal is to maintain a constant arc length.
-Drives a constant Current.
-Synergically Controls WFS to Maintain Voltage at the desired Set point.
•Arc Length is proportional to Voltage.
•Traditionally used for larger diameter wires and slower travel speeds.
CONSTANT CURRENT (CC)
interacting forces.
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AMPS
WIRE FEED SPEED
CURRENT HELD |
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CONSTANT |
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AND |
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WIRE FEED | Extension |
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SPEED VARIED | Heating= Vir | Total Electrical |
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TO |
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MAINTAIN CONSTANT | Arc Length= Varc |
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ARC LENGTH |
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PUSH |
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FIGURE B.3
CONSTANT VOLTAGE (CV)
• Operator presets Wire Feed Speed and desired |
Voltage |
• The Power Source: |
- Goal is to maintain a constant arc length. |
- Commands constant wire feed speed |
PUSH Positive Negative
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Positive | Negative |
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Positive | Positive |
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PULL |
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PUSH | |||||||||
Lead Arc
Trail Arc
PUSH Positive Negative
- Synergically Controls Current to Maintain |
Voltage at the desired Set point |
• Arc Length is proportional to Voltage |
• Traditionally used for smaller diameter wires and |
faster travel speeds. |
CONSTANT VOLTAGE (CV)
AMPS
CURRENT VARIED |
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AND |
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WIRE FEED SPEED | Extension |
CAUTION
Never simultaneously touch electrically "hot" parts in the electrode circuits of two different welders. The electrode to electrode no load volt- age of multiple arc systems with opposite polari- ties can be double the no load voltage of each arc. Consult the Safety information located at the front of the Instruction Manual for additional informa- tion.
HELD CONSTANT | Heating= Vir | Total Electrical | ||
TO |
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MAINTAIN CONSTANT | Arc Length= Varc |
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ARC LENGTH |
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WIRE FEED SPEED
POWER WAVE® AC/DC 1000
