Plasma machining electrode and plasma machining device
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United States of America Patent
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-
Jun 24, 2003
Grant Date -
N/A
app pub date -
Nov 22, 2000
filing date -
Nov 26, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention prolongs the electrode lifetime of plasma machining electrodes having a hafnium or zirconium insert. A hafnium or zirconium insert 21 inserted into the tip of a copper holder 22 protrudes from the tip of the copper holder 22. The protrusion length L is not larger than the diameter D of the insert, preferably not larger than 0.5 mm. The protruding portion 21a of the insert has a rounded section without sharp angles. The rear surface 21 of the insert is exposed to the flow of the cooling water inside the electrode. At least during the generation of the pilot arc, a plasma gas containing at least 5 mol % nitrogen is used.
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