A process for applying weld overlay material to a tube with a single pass of a weld head. A gas tungsten arc welding process with high frequency wave pulse current is preferably used to apply the overlay material. The overlay material is preferably in the form of weld wire and is pre-heated and mechanically...http://www.google.com/patents/US6781083?utm_source=gb-gplus-sharePatent US6781083 - Weld overlay system
