Innovative high thickness cutting technique with new filtration systems.
G. Pilot, J.P Grandjean, H. Gräber, J. Grimaldi, EURADWASTE'99, 15-18 novembre 1999, Luxembourg.
The LSI (from the german words: Lichtbogen - Sauerstoff - Impulsschneiden) is an
innovative thermal cutting technique. It involves the ignition of an oscillatory voltaic
arc between a continuous-fed consumable electrode and the workpiece. The basic
material is first locally heated to ignition temperature by the voltaic arc, then burnt due
to the simultaneously exiting oxygen jet that is coaxially supplied at high speed and
then blown out of the kerf The total sum of thermal energies allows the cutting of
various metals and their respective alloys.
This tool was tested in a 32 m3 cutting cell equipped with an exhaust system and
numerous measurement devices. With a 1.6 mm diameter wire, the cutting of 100 mm
thickness stainless steel plates and 200 mm thickness mild steel plates was possible.
With a 2.4 mm diameter wire, the cutting of 250 mm thickness mild steel plates was
The cutting speed was faster for mild steel than for stainless steel plates (respectively
10 c d m i n and 3 cdmin for example in the case of 100 mm thickness plates).
This tool produces a lot of fumes and it is necessary to use an adequate filtration system
for managing these fumes.
Two innovative filtration systems have been developed:
B an electrostatic filter with acoustic declogging,
B a pleated stainless steel cartridge with pneumatic declogging.
These systems have been tested in different configurations in order to restore the
filtration efficiency (electrostatic filter) or to restore the pressure drop (stainless steel
cartridge) and have been satisfactory.