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Overzicht DC TIG mode
7.7.2 Wisselstroom (AC) TIG lassen
Met wisselstroom worden aluminium, magnesium en legeringen hiervan gelast.
De thermische belasting van de wolfram elektrode is met wisselstroom TIG lassen aanzienlijk groter. Gedurende de
min cyclus vind er warmte overdracht naar het werkstuk plaats, elektrode wordt nauwelijks verwarmt. Tijdens de plus
periode van het signaal (Elektrode op pluspool) word het werkstuk, wat zich binnen de lichtboog gebied bevindt,
gereinigd van de oxidehuid. Bij een goede verhouding tussen de lasstroom en de diameter van de elektrode zal zich
aan de punt van de elektrode een kalotje vormen.
Overzicht AC TIG lassen
TIG standaard mode
Proces type instellen m.b.v.
tiptoets F1:
1
1
2 Takt (zie ook hoofdstuk 4.7.2)
Zolang de toortsschakelaar (TS) ingedrukt is, blijft het proces actief.
Bij loslaten TS wordt het lasproces gestopt. Down slope start.
Lasstroom loopt terug tot eind stroom gevolgd door nagas.
4 Takt (zie ook hoofdstuk 4.7.2)
Door indrukken van TS word de lasstroom actief.
Opnieuw indrukken en ingedrukt houden, Down slope start.
Lasstroom loopt terug tot eind stroom.
Loslaten TS boog dooft, gevolgd door nagas.
4 Takt met tweede lasstroom I2 (zie ook hoofdstuk 4.7.2)
Handmatig pulsen tussen stroom I
1
en I
2
.
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