WL20 lanthanated tungsten electrodes (WL20 electrodes) are tungsten electrodes doped with 1.8%–2.2% lanthanum oxide (La₂O₃) and are color-coded sky blue. Among the lanthanated tungsten electrode series, WL20 offers the highest overall performance, widest current compatibility, and broadest application range. It features exceptional electron emission, thermal stability, and arc erosion resistance, making it the ideal non-radioactive alternative to thoriated tungsten (WT20).
WL20 performs exceptionally well in both high-frequency ignition for automated welding and low-current manual operations. It is widely used in aerospace, nuclear engineering, and precision manufacturing, where welding quality and reliability are critical.
1.Key Performance Characteristics
| Feature | Description |
| Arc Starting | Very low arc-starting voltage; excellent electron emission; quick and stable arc initiation |
| Arc Focus | Stable and concentrated arc column; easy control over the weld pool |
| High-Temperature Resistance | Exceptional thermal load capacity; resists tip deformation under >300A |
| Erosion Resistance | Outstanding resistance to arc erosion; maintains tip shape for longer durations |
| Shape Retention | Maintains sharpened or balled tip during extended high-heat welding |
| Current Range | Suitable for ultra-low (below 5A) to very high (>300A) welding currents |
| Environmental Safety | 100% radiation-free; safe for all operating environments |
2.Recommended Applications
Due to its high versatility and robust performance under demanding conditions, WL20 is ideal for:
Precision TIG Welding (AC/DC)
Suitable for carbon steel, stainless steel, nickel alloys, titanium alloys, copper alloys, and more
Preferred for high-precision components like sensors, medical devices, and electronic enclosures
High-Current and Thick-Section Welding
Maintains tip stability at high currents (>200A)
Used for heavy-duty structures, pipe welding, and heat exchanger fabrication
Robotic and Automated Welding
Excellent arc stability under high-frequency start conditions
Widely applied in aerospace engine manufacturing, pressure vessel production, and rail systems
Plasma Arc Welding (PAW) and Cutting (PAC)
Functions as a reliable cathode in plasma systems
Performs well in thin-section, high-precision, and sealed welding applications
3.Usage Tips and Best Practices
Recommended Grinding Angle: 15°–30° cone for better arc focus and penetration control
Applicable Current: Stable operation from <5A to over 300A
Compatible Welding Sources: Performs best with high-frequency ignition TIG/PAW equipment
Reusability: Regularly inspect the electrode tip for balling or erosion and regrind as necessary
Contamination Handling: If tip contamination or oxidation occurs, regrind with a fine abrasive wheel
Storage & Handling: Store in a sealed, dry container to prevent moisture absorption or oil contamination
