Name: 0870-424 Cerium Tungsten Electrode (2.4mm) | OTC TIG Torch Part
Brand: OTC DAIHEN
SKU: 0870-424

OTC Daihen Genuine TIG Cerium Tungsten Electrode 0870-424 (2.4mm / Grey Tip)

0870-424 (Official replacement for legacy model 0870-024) is a genuine high-performance cerium-doped tungsten electrode (WC20, color code: Grey) custom-engineered by OTC Daihen for industrial TIG welding applications, measuring Φ2.4mm × 150mm. Serving as the core emitter sustaining the welding arc, this electrode is uniformly doped with high-purity cerium oxide (CeO2). It provides a low work function for instantaneous, millisecond arc ignition even at ultra-low amperage, while maintaining superior arc stiffness and concentration under heavy welding loads. Replacing inferior tungsten needles with original 0870-424 electrodes eliminates hard arc starting, arc deflection, rapid burn-off, and tungsten inclusion defects, delivering mirror-like weld finishes without radioactive hazards.

OTC Daihen Genuine Cerium Tungsten Electrode 0870-424 Front View — Figure 1: Front View of Genuine OTC 2.4mm TIG Cerium Tungsten Electrode 0870-424

⚙️ Technical Specifications

Specification Attribute	Detailed Parameter
OEM Part Number	0870-424 (Direct replacement for legacy 0870-024)
Product Type	TIG Welding Cerium Tungsten Electrode (WC20)
Physical Dimensions	Diameter Φ2.4mm × Length 150mm
Color Code & Material	Grey Tip / WC20 Cerium Tungsten (Non-radioactive, eco-friendly)
Packaging Standard	10 Pcs / Box (OEM moisture-proof plastic case)
Quality Guarantee	100% genuine OEM consumable; stable arc & zero inclusion

OTC Cerium Tungsten Electrode 0870-424 Packaging — Figure 2: Genuine OEM Shock-Proof and Moisture-Resistant Packaging for 0870-424 (10 Pcs/Box)

🔧 Tungsten Grinding & TIG Arc Stability Guide (Essential Reading)

Critical Rule: Never Grind Tungsten Horizontally! Grinding tungsten needles across the wheel edge leaves circumferential scratches. During arc strike, electrons emit erratically across horizontal ridges, causing severe arc wandering and deflection. Always grind longitudinally (lengthwise) along the axis so grinding marks run parallel to the needle, ensuring a laser-sharp, stable arc.
Preventing Blue/Black Oxidation: If the tungsten tip turns black or deep blue after extinguishing the arc, it has oxidized from premature atmospheric exposure. Increase post-flow shielding gas time on the welding machine (recommend 3 to 5 seconds) so argon continues protecting the hot electrode until it cools to a bright silver finish.
Contamination Protocol: If filler wire touches the tungsten or the tip dips into the weld pool, stop welding immediately! Continuing to weld with a contaminated electrode causes severe tungsten inclusion defects. Break off the contaminated tip and regrind a clean taper.
2.4mm Amperage Matching: Φ2.4mm cerium tungsten electrodes perform optimally between 150A and 250A DC. Excessive current (>280A) melts the tip into a sphere, while insufficient current (<50A) degrades arc stability. Use 1.6mm electrodes for low-amperage thin sheet welding.