2% Ceriated Tungsten TIG Electrodes (Grey)
Comprehensive technical specification for 2% Ceriated Tungsten TIG electrodes (grey band) used in Canadian fabrication shops. Covers exact sizing, tolerances, machinability, common defects, and storage guidelines for DC welding applications.
Material Overview & Common Uses
2% Ceriated Tungsten electrodes (EWCe-2, grey band) are a non-radioactive alternative to thoriated tungsten, offering excellent arc stability and ease of starting at low amperages. They are primarily used for DC welding of carbon steel, stainless steel, nickel alloys, and titanium in Canadian fabrication shops. The cerium oxide (CeO2) content improves electron emission and reduces electrode erosion, making them ideal for thin-gauge sheet metal work, orbital welding, and automated TIG applications. Common stock sizes in Canada include 1/16", 3/32", 1/8", and 5/32" diameters, typically supplied in 7" (178 mm) lengths. These electrodes are preferred for their consistent performance in both manual and robotic welding cells.
Core Technical Properties & Sizing
| Property | Specification / Value |
|---|---|
| Composition | 98% Tungsten (W) + 2% Cerium Oxide (CeO₂) |
| Diameter Tolerance (≤ 1/8") | ±0.002" (0.05 mm) |
| Diameter Tolerance (> 1/8") | ±0.003" (0.08 mm) |
| Length Tolerance | 7.00" ±0.125" (178 mm ±3.2 mm) |
| Straightness | ≤0.010" per foot (0.83 mm/m) max bow |
| Surface Finish (Ra) | ≤0.8 µm (ground or polished) |
| Density | 19.2 g/cm³ |
| Electrical Conductivity | ~30% IACS |
| Melting Point | 3422°C (6192°F) |
| Standard Packaging | 10-piece tubes or 50-piece bulk packs (grey band at chuck end) |
Machinability, Tooling & Feeds
2% Ceriated tungsten is machinable only by grinding – it cannot be turned, milled, or drilled with conventional HSS or carbide tooling due to extreme hardness (Rockwell C ~40-45). Grinding must be done on a dedicated tungsten grinder or a fine-grit (120-220) diamond wheel.
| Parameter | Recommended Specification |
|---|---|
| Machining Method | Grinding only (diamond wheel) |
| Wheel Speed | 3000–4000 SFPM |
| Pass Depth | 0.001–0.002" per pass (light passes) |
| Cooling | Water cooling required to prevent micro-cracking |
| Tip Angle (DC Welding) | 30°–60° included angle (pointed tip) |
| Automated Grinder Feed Rate | 0.005–0.010" per second |
The tip should be ground longitudinally (parallel to the electrode axis) to produce a flat, consistent taper. Do not use aluminum oxide wheels – they contaminate the tungsten. After grinding, inspect for burrs or feather edges under 10x magnification.
Common Defects & Quality Control
| Defect | Acceptance / Rejection Criteria |
|---|---|
| Longitudinal cracks or splits | Reject if visible under 5x magnification |
| Surface pitting or porosity | Reject if pits exceed 0.005" depth |
| Diameter out-of-tolerance | Reject if fails go/no-go ring gauge |
| Excessive bow | Reject if >0.010" per foot (causes arc wander) |
| Missing or incorrect colour band | Reject; must clearly match EWCe-2 grey band standard |
| Oxide scale or discoloration | Acceptable if light tarnish only; reject heavy scale |
QC sampling per lot: per ISO 2859-1, AQL 1.0 for critical defects (cracks, wrong composition), AQL 2.5 for minor defects (surface finish, banding). Incoming inspection should include diameter mic check (3 points per electrode), length check, and visual inspection under good lighting.
Storage, Handling & Racking Guidelines
Store in original sealed tubes or moisture-proof containers in a clean, dry environment (RH <40%, temperature 15–25°C). Avoid exposure to welding fumes, oil, or grease. Do not store near grinding dust or metal shavings. For long-term storage, use desiccant packs inside containers. Electrodes should be handled with clean gloves to prevent oil transfer from skin. Racking: use vertical or horizontal racks with individual slots to prevent contact and chipping. Do not stack loose electrodes – they can roll and develop surface scratches. FIFO rotation is recommended; label each container with receipt date. Shelf life is indefinite if stored properly, but re-inspect after 12 months for corrosion or contamination. In Canadian shops with high humidity (coastal or winter condensation), consider using a heated cabinet or silica gel packs.