VARIABLE POLARITY PLASMA ARC WELDING PROCESS FOR THICK ALUMINUM ALLOY

2006 ◽  
Vol 42 (09) ◽  
pp. 144 ◽  
Author(s):  
Yongquan HAN
Keyword(s):  
Aluminum Alloy ◽  
Arc Welding ◽  
Welding Process ◽  
Plasma Arc Welding ◽  
Plasma Arc ◽  
Variable Polarity ◽  
Arc Welding Process ◽  
Variable Polarity Plasma Arc

Feasibility study of acoustic sensing for the welding pool mode in variable-polarity plasma arc welding

2002 ◽  
Vol 216 (10) ◽  
pp. 1355-1366 ◽  
Author(s):  
H Wang ◽  
R Kovacevic
Keyword(s):  
Acoustic Signal ◽  
Arc Welding ◽  
Welding Process ◽  
Plasma Arc Welding ◽  
Plasma Arc ◽  
Welding Pool ◽  
Power Spectral ◽  
Variable Polarity ◽  
Short Time ◽  
Variable Polarity Plasma Arc

The relationships between the acoustic signal and the modes of the welding pool, such as no-keyhole (melt-in), keyhole and cutting, in variable-polarity plasma arc welding are investigated. The Welch power spectral density (PSD) estimate and short-time Fourier transformation are implemented to analyse and identify the different modes of the welding pool. The results show that the no-keyhole mode (melt-in welding process) can be clearly distinguished from the keyhole and the cutting modes. The keyhole size is inversely proportional to the Welch PSD estimate of the acoustic signal.

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