![](/mwf/attachments//avatars/4269-2369.jpg)
http://www.millerwelds.com/education/tech_articles/articles11.php
Above is a link that explains some of the advantages and relationships the freq. balance plays in controlling the puddle on variuos thicknesses.
Hope this helps, there isn't alot on the web for free when looking for GTAW-P articles.
John Wright