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Lichtbogenlänge
Die Lichtbogenlänge a, das heißt der Abstand zwischen Stabelektrode und Werkstück, soll betragen:
bei Stabelektroden vom Umhüllungstyp R, RR, A, C = 1,0 · d,
bei Stabelektroden vom Umhüllungstyp B = 0,5 · d,
Ein zu langer Lichtbogen verringert die Einbrandtiefe, vergrößert die Blaswirkung und kann, insbesondere bei
basischumhüllten Stabelektroden, zu Poren in der Schweißnaht führen.
3.1.6Schweißpositionen nach DIN 1921
3.1.5Zünden und Brennen des Lichtbogens
Zündstelle
Das Zünden des Lichtbogens hat stets in der Schweißfuge zu erfolgen.
Die Zündstelle muß anschließend überschweißt und damit aufgeschmolzen werden, weil sonst Rißgefahr besteht.
d
a
falsch
richtig
Zündstelle
Zündstelle
Leerlaufspannung
Kurzschlußspan-
nung 3 bis 5 V
Arbeitsspannung
20 bis 30 V
Zündablauf
q
q = quer
f
s
s = steigend
f = fallend
ü = überkopf
ü
w = waagerecht
ww
h
h = horizontal
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