Lincoln Electric 11226, 11124 manual Multiple ARC System Considerations, Basic Modes of Operation

B-8 OPERATION B-8

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 K2282-1 Power Wave System Interface, which not only synchronizes the arcs, but also enables adjustment of the phase relationship between them. Ideally, the net result is a cancellation of the

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.

	FIGURE B.2
+	-	+	+
-	+	-	-

AMPS

WIRE FEED SPEED

CURRENT HELD
CONSTANT
AND
WIRE FEED	Extension
SPEED VARIED	Heating= Vir	Total Electrical
TO		Stick out
		V= Vir+Varc
MAINTAIN CONSTANT	Arc Length= Varc
ARC LENGTH

PUSH PULL

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

Positive	Negative		Negative
Positive	Positive		Negative
PULL		PULL
	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
AND
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		Stick out
		V= Vir+Varc
MAINTAIN CONSTANT	Arc Length= Varc
ARC LENGTH

WIRE FEED SPEED

POWER WAVE® AC/DC 1000