80
Tucker GmbH,
Mail / Post:
Max-Eyth-Str.1, 35394 Gießen, Germany
Stud welding unit N1500i
As of: Aug 12.2021
Manual part number: BE 1221
6.11
Pulse Cleaning (during the beginning of main arc stage)
The welder normally outputs a constant low current in pilot arc to draw an arc
before turning on the main arc for welding. In some applications, it is desirable to have
very high and narrow pulses in the beginning of main arc stage before engaging full
main arc. The potential benefits are the ability to pre-clean the workpiece from
surface oxide, stamping oil contamination in sheet metal, or thick or varying
galvanized surface, or mill-scaled plate in fabrication, or shipyard plates coated
with weld-able primer.
Pulse cleaning is enabled by enabling F37. For the peak pulse, it attempts to go the
maximum rated current for 4ms, with a 10ms pause (or low pilot current) in between.
Due to the inductance of the weld circuit, it is often below the set values. After each
pulse, the arc voltage is measured and compared with F38 - pulse cleaning
threshold voltage. When actual voltage is below F38, it proceeds to main current,
otherwise another cleaning pulse will be sent. The maximum cleaning pulse count is
set in F39. Since the cleaning pulse is adaptive and thus the number of pulses can
vary, it has a small effect in increased total heat input. To make total energy
consistent, F40 can be used to subtract a time in the main arc time.
The example below shows 4 cleaning pulses of 1200A prior to the main arc current of
570A. It is recommended to use Nelware PC software to configure the pulse cleaning
feature properly.
By default pulse cleaning in main arc is disabled.
