Part No. 729-110-040 Rev. 1.41 | June 2016
© 2016 Nelson Stud Welding, Inc. All Rights Reserved.
36
Since [20 ms
– 30 ms] < 0, the, the gun coil is released prior to starting the main current.
The resulting Actual Weld Time is 20 ms.
The stud would still take 30 ms to drop, but the main current and main arc would only be 20 ms.
5.6
Drop Time Variables
Several different conditions affect drop time. The drop time duration will vary under the conditions outlined
below.
Power Source Gun Control and Trigger Switch Circuit
The rate in which the gun coil energy is removed plays a large part in how fast the stud will drop. If the coil
only
has an anti-parallel diode (in either the gun itself or inside the power source), it will drop much later than a
configuration with a diode/resistor since the energy is dissipated in the resistor after the coil is de-energized.
PLUNGE DAMPENER
Tranquil arc dampeners will slow the rate of stud travel speed (in the downward direction). Dampeners can
adjust this rate for up to a few hundred milliseconds of travel time. Plunge dampeners should not be used with
the Short-Cycle process.
TEMPERATURE
As temperatures rise, dampeners have less of an impact. They allow the stud to fall nearly 65% faster at 90°F
(32°C) than at 0°F (-18°C).
MOLTEN STUD SHAPE
As the stud melts during the weld, it has the potential to change shape. It may elongate or even drip. The
molten shape of the stud will vary as the weld heat varies. These factors can change the timing of the weld
short circuit.
Summary of Contents for ArcCharger N550C DOMESTIC
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