Cobalt Filler Wire
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Cobalt filler wire (commonly known as Stellite Filler Wire) is a TIG and oxy-fuel welding consumable (also used in GTAW, oxy-acetylene welding, laser cladding, PTA, and GMAW hardfacing) built from cobalt-chromium-tungsten alloys. These wires deposit hard, wear-resistant overlay layers on parts that face extreme service conditions.
The weld deposit keeps its hardness at red-heat temperatures. It resists galling, abrasion, erosion, and corrosive attack from hot gases. The alloy matrix stays stable without softening during repeated thermal cycles.
Engineers pick cobalt / stellite welding wire hen steel or nickel overlays lose hardness in high-heat zones. Valve seats, pump sleeves, and turbine blade tips all benefit from a cobalt-based deposit.
Common uses include power plant valve hardfacing, petrochemical reactor internals, glass mould plating, and gas turbine blade tip repair.
Nicorex Alloys stocks and supplies cobalt filler wire grades from our Mumbai facility. As a supplier and stockist, we serve refineries, power plants, and fabrication shops across India.
Complete Range of Cobalt Filler Wire
Quick Selection Matrix
| Base Metal Being Welded | Recommended Filler Wire | AWS Class | Why This Choice |
|---|---|---|---|
| AISI 316 Stainless Steel Valve Seats | ERCOCR-A Filler Wire (CO6) | ERCoCr-A | Best all-round hardness and corrosion resistance for valve hardfacing |
| Carbon Steel Pump Sleeves | ERCOCR-B Filler Wire (CO12) | ERCoCr-B | Higher tungsten gives strong abrasion resistance on softer base metals |
| AISI 304 Stainless Steel Glass Moulds | ERCOCR-C Filler Wire (CO1) | ERCoCr-C | Maximum hardness needed for severe wear on mould contact surfaces |
| Inconel 625 or Dissimilar Joints | ERCOCR-E Filler Wire (CO21) | ERCoCr-E | Low carbon content and good ductility suit joining dissimilar alloys |
| Nickel Alloy Turbine Components Above 800°C | CO25 Filler Wire | Proprietary | Retains strength and oxidation resistance at very high service temperatures |
| Stellite-Faced Exhaust Valve Repair | ERCOCR-A Filler Wire (CO6) | ERCoCr-A | Matches original Stellite 6 deposit chemistry for like-for-like repair |
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