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OPERATION | ||
PULSE WELDING |
| FIGURE B.3 |
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 1.50, with 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.
All pulse welding programs are synergic. As the wire feed speed is adjusted, the Power Wave will automati- cally recalculate the waveform parameters to maintain similar arc properties.
The Power Wave utilizes "adaptive control" to compen- sate for changes in electrical stick out while welding. (Contact to Work Distance is the distance from the contact tip to the work piece.) The Power Wave wave forms are optimized for a 0.75" (19mm)
Arc Control, often referred to as wave control, in pulse programs usually adjusts the focus or shape of the arc. Wave control values greater than 0.0 increase the pulse frequency while decreasing the background cur- rent, resulting in a tight, stiff arc best for high speed sheet metal welding. Wave control values less than 0.0 decrease the pulse frequency while increasing the background current, for a soft arc good for
CURRENT WAVE FORM (PULSE)
Current
Time
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POWER WAVE 355M/405M
