Hastelloy X is a high temperature Nickel bearing alloy frequently used in the aerospace industry. It is readily weldable by Gas Tungsten Arc Welding (GTAW), Gas Metal Arc Welding (GMAW), Shielded Metal Arc Welding ( SMAW), and Resistance Welding (RW).
HASTELLOY X - AIRCRAFT APPLICATION
The recommended material preparation for welding HASTELLOY x is the same as for all resistance welding. The weld area and adjacent areas should be cleaned of all oil, grease, cutting oils, debris, scale, paint, markers and all foreign matter. Any appropriate solvent may be employed. There is no published standard for cleaning this material.
Reference: Haynes International – Hastelloy X
RWMA – Resistance Welding Manual 4th Edition