High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes
Published 4 issues per year
ISSN Print: 1093-3611
ISSN Online: 1940-4360
IF:
0.4
Immediacy Index:
0.1
Eigenfactor:
0.00005
JCI:
0.07
SJR:
0.198
SNIP:
0.48
CiteScore™::
1.1
H-Index:
20
Indexed in
PLASMA OSCILLATIONS DURING cw CO2 LASER WELDING
Volume 5,
Issue 4, 2001,
4 pages
DOI: 10.1615/HighTempMatProc.v5.i4.60
ABSTRACT
Fluctuations of cold (~14 kK), dense (~1017 cm-3) plasma which burns above a metallic surface during welding with cw CO2 laser are registered in monochromatic radiation ~450 nm. They are connected with the pressure variations inside a keyhole which generate acoustic waves additionally measured with a microphone at the frequency range of 20-2ґ104 Hz. The power spectra densities (PSD) of the both signals and their coherence is studied in dependence on the welding conditions. In the case of welding of mild steel 1mm thick with laser power of 1.75 kW good conditions are characterized by peaks at the ~1.3 kHz and ~3.1 kHz in the PSD of both signals.
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