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Plasmabrænderen
En plasmabrænder ligner en TIG-svejse-
brænder, hvor der er tilføjet en dyse for at
lave en mekanisk indsnøring af lysbuen.
Elektroden (pos. 1) består af kobber, hvori
der er indpresset en hafniumstift. Dysen
(pos. 2) er udført i kobber. Dysekappen
(pos. 3) har til formål at fastholde dysen og
er udformet så dyse og dysekappe får en
god luftkøling.
Der er kun en tryklufttilledning til pistolen,
hvor gassen deles til plasmagas og køle-
gas. For at lysbuen kan tændes, findes der i
PDX en HF-højspændingsgenerator, der får
gnister til at springe mellem elektrode og
dyse. Derved ioniseres plasmagassen, og
pilotlysbuen tændes.
Af sikkerhedshensyn, samt for at undgå op-
varmning og slitage, er pilotlysbuetiden
begrænset til max. 3 sek.
Pilotlysbuetændingen er meget betjenings-
venlig og let at anvende. Se også afsnittet
"Vejledning i plasmaskæring".
The plasma cutting torch
A plasma cutting torch resembles a TIG
torch, but one to which a nozzle has been
fitted in order to mechanically constrict the
arc.
The electrode (pos. 1) is made of copper
having a pin of hafnium pressed-in at the
point. The nozzle (pos. 2) is made of cop-
per. The purpose of the nozzle cap (pos. 3)
is to retain the nozzle, and it has been
designed so that both nozzle and nozzle
cap receive proper aircooling.
There is only one compressed-air entry to
the torch where the gas is divided into
plasma gas and cooling gas. In order to
ignite the pilot arc the PDX is fitted with an
HF high voltage generator which makes
sparks jump between the electrode and the
nozzle. Thus the plasma gas is ionized and
the pilot arc is ignited.
As a precaution and in order to avoid heat-
ing and wear and tear, the pilot arc time is
limited to 3 secs.
The pilot arc ignition is easy to operate. See
also the section "Guide to plasma cutting".
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