Characterisation of the plasma shape of the TIG welding arc Online publication date: Thu, 31-Jan-2008
by Janos Dobranszky, Andrea Bernath, Hilda Marton
International Journal of Microstructure and Materials Properties (IJMMP), Vol. 3, No. 1, 2008
Abstract: Tungsten electrodes were prepared to analyse the plasma geometry at TIG welding. The investigated electrodes were LaO2 and ThO2 alloyed. Pointed and flat-tipped electrodes were ground as well. The shape of the plasma was analysed at 36 different electrodes. The plasma geometry was measured by image analysis of a lot of digital pictures. The complete and the inner part (brightest) of the plasma were checked as well. Measured values were represented as a function of taper angles. The maximal values of taper angle, at which the plasma geometry characteristics were obtained for sharpened electrodes, were 20° and 30°. The plasma-shape characteristics of red and black electrodes are running collaterally. Despite this, the characteristics of the gold electrode shift to higher taper angles caused by the higher LaO2 content of the electrode. There was no clear correlation between the electrode taper angle and the plasma-shape characteristics for the blunt electrodes.
Online publication date: Thu, 31-Jan-2008
If you are not a subscriber and you just want to read the full contents of this article, buy online access here.Complimentary Subscribers, Editors or Members of the Editorial Board of the International Journal of Microstructure and Materials Properties (IJMMP):
Login with your Inderscience username and password:
Want to subscribe?
A subscription gives you complete access to all articles in the current issue, as well as to all articles in the previous three years (where applicable). See our Orders page to subscribe.
If you still need assistance, please email firstname.lastname@example.org