#inconel625overlay #inconelcladding

When valves such as ball valves and check valves are to be used in highly corrosive environments, in addition to choosing expensive corrosion-resistant alloy materials, we can also consider using carbon steel as the base material and surfacing inconel 625 to be overlay or cladding on the contact surface with the medium to save costs.

Inconel 625 overlay cladding is usually performed using the submerged arc welding process (SAW). However, flux-cored (either self-shielded or gas-shielded), plasma arc, and electroslag welding methods can also produce weld cladding. Filler metals are available as covered electrodes, coiled electrode wire, and strip electrodes. All welding shall be performed with a procedure and welders or welding operators that are qualified in accordance with Section IX of the ASME Boiler and Pressure Vessel Code. After weld overlay, the alloy 625 cladding and base metal are brought together to form a metallurgical bond at essentially the entire interface of the two metals. The weld cladding shall be then ground or machined to the specified thickness. Generally, the filler metal of covered electrodes shall be AWS A5.11 ENiCrMo-3 for SMAW; while the filler metal of bare rods or electrodes shall be AWS A5.14 ERNiCrMo-3.