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1. (WO2015047620) METHODS OF TUNGSTEN SUBMERGED ARC WELDING USING POWDERED FLUX AND A SUPERALLOY FEED MATERIAL

Pub. No.:    WO/2015/047620    International Application No.:    PCT/US2014/052478
Publication Date: Fri Apr 03 01:59:59 CEST 2015 International Filing Date: Tue Aug 26 01:59:59 CEST 2014
IPC: B23K 9/167
B23K 9/18
B23K 9/23
B23K 9/235
Applicants: SIEMENS ENERGY, INC.
Inventors: BRUCK, Gerald J.
Title: METHODS OF TUNGSTEN SUBMERGED ARC WELDING USING POWDERED FLUX AND A SUPERALLOY FEED MATERIAL
Abstract:
A tungsten submerged arc welding process wherein a non- consumable electrode (18) provides an arc (16) under a protective bed of flux powder (26), thereby eliminating the need for an inert cover gas supply. The arc (16) melts a feed material in the form of alloy powder (22) or filler wire (40) along with a surface of a substrate (12) to form a layer of cladding material (10) covered by a layer of slag (20). The flux (26) and slag (20) function to shape the deposit, to control cooling, to scavenge contaminants and to shield the deposit from reaction with air, thereby facilitating the deposit of previously unweldable superalloy materials.