Constant Voltage Welding, Synergic CV

B-6

OPERATION

B-6

SMAW (STICK) WELDING

The welding current and Arc Force settings can be set through a Power Feed 10M or Power Feed 25M wire feeder. Alternatively an optional Stick / TIG UI can be installed into the power source to control these set- tings locally.

In a SMAW (STICK mode), Arc Force can be adjust- ed. It can be set to the lower range for a soft and less penetrating arc characteristic (negative numeric val- ues) or to the higher range (positive numeric values) for a crisp and more penetrating arc. Normally, when welding with cellulosic types of electrodes (E6010, E7010, E6011), a higher energy arc is required to maintain arc stability. This is usually indicated when the electrode sticks to the work-piece or when the arc becomes unstable during manipulative technique. For low hydrogen types of electrodes (E7018, E8018, E9018, etc.) a softer arc is usually desirable and the lower end of the Arc Control suits these types of elec- trodes. In either case the arc control is available to increase or decrease the energy level delivered to the arc.

GTAW (TIG) WELDING

The welding current can be set through a Power Feed 10M or Power Feed 25M wire feeder. Alternatively an optional Stick / TIG UI can be installed into the power source to control these settings locally.

The TIG mode features continuous control from 5 to 350 amps with the use of an optional foot amptrol. The Power Wave® S350 can be run in either a Touch Start TIG mode or Scratch start TIG mode.

CONSTANT VOLTAGE WELDING

Synergic CV

For each wire feed speed, a corresponding voltage is preprogrammed into the machine through special soft- ware at the factory.

The nominal preprogrammed voltage is the best aver- age voltage for a given wire feed speed, but may be adjusted to preference. When the wire feed speed changes, the Power Wave® S350 automatically adjusts the voltage level correspondingly to maintain similar arc characteristics throughout the WFS range.

Non Synergic CV

In non-synergic modes, the WFS control behaves more like a conventional CV power source where WFS and voltage are independent adjustments. Therefore to maintain the arc characteristics, the oper- ator must adjust the voltage to compensate for any changes made to the WFS.

All CV Modes

Pinch adjusts the apparent inductance of the wave shape. The “pinch” function is inversely proportional to inductance. Therefore, increasing Pinch Control greater than 0.0 results in a crisper arc (more spatter) while decreasing the Pinch Control to less than 0.0 provides a softer arc (less spatter).

PULSE WELDING

Pulse welding procedures are set by controlling an overall “arc length” variable. When pulse welding, the arc voltage is highly dependent upon the waveform. The peak current, back ground current, rise time, fall time and pulse frequency all affect the voltage. The exact voltage for a given wire feed speed can only be predicted when all the pulsing waveform parameters are known. Using a preset voltage becomes impracti- cal and instead the arc length is set by adjusting “trim”.

Trim adjusts the arc length and ranges from 0.50 to

1.50with a nominal value of 1.00. Trim values greater than 1.00 increase the arc length, while values less than 1.00 decrease the arc length. (See figure B.3)

FIGURE B.3

Trim .50	Trim 1.00	Trim 1.50
Arc Length Short	Arc Length Medium	Arc Length Long

POWER WAVE® S350