Patent Number: 6,781,083

Title: Weld overlay system

Abstract: 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 fed into the resultant weld pool on the tube. The wire is preferably resistance-heated to a temperature lower than its melting point prior to contact of the wire with the molten weld pool, and the weld pool is preferably oscillated during the overlay process. Use of the gas tungsten arc welding process provides sufficient weld fusion to allow the overlaid tube to be subsequently bent and formed, and use of the high frequency wave pulse current provides for reduced dilution of the overlay.

Inventors: Keller; Howard Derrick (Greenville, SC), Prince; Joseph Riley (Roebuck, SC)


International Classification: B23K 9/04 (20060101); B23K 009/04 ()

Expiration Date: 08/24/2021