TIG Welding Electrode Selection: A Practical Guide

Quick Answer

For most TIG welding jobs, choose a 2% ceriated tungsten for thin materials and a 2% lanthanated for general-purpose work. Match the electrode size to your amperage range and use a filler metal that matches your base material.

Why Tungsten Type Matters

The tungsten electrode is the heart of the TIG torch. Different alloys change how the arc starts, how stable it is, and how long the electrode lasts. Pure tungsten works for AC welding but has lower current capacity and can be prone to contamination. Thoriated tungsten offers good arc starts but is being phased out due to radioactivity concerns. Ceriated and lanthanated electrodes are versatile and work well on both AC and DC.

For most hobbyists and professionals, a 2% ceriated or 2% lanthanated electrode covers the majority of mild steel, stainless steel, and aluminum work. If you need a dedicated electrode for DC welding of steel, 1.5% lanthanated is a good choice. Avoid pure tungsten for DC welding—it won't handle the heat and will ball up quickly.

Electrode Size and Amperage

Electrode diameter directly affects the amperage range you can use. A 1/16-inch electrode handles up to about 150 amps on DC, while a 3/32-inch electrode can go up to 200 amps. Using an electrode too small for your amperage causes overheating and rapid wear; using one too large makes arc starting difficult and can cause arc wandering.

As a general rule, start with a 1/16-inch electrode for most work under 150 amps. For heavier plate or higher amperage, step up to 3/32-inch. Always check the manufacturer's amperage chart for the specific tungsten alloy you're using, as ratings vary.

Filler Metal: Matching the Base Material

The filler metal you choose must match the base material to ensure a strong, corrosion-resistant weld. For mild steel, ER70S-6 is common. For stainless steel, ER308L is the go-to for 304 and 316 stainless. Aluminum requires ER4043 or ER5356 depending on the alloy and desired properties.

When in doubt, consult the base material's specification or a welding filler metal selection chart. Using the wrong filler can lead to cracking, poor corrosion resistance, or weak joints.

Decision Rules for Choosing a TIG Electrode

• Base material: Aluminum and magnesium: use AC with pure or ceriated tungsten. Steel and stainless: use DC with lanthanated or thoriated tungsten. Copper and brass: use DC with a pointed electrode and no filler if possible. Match the tungsten to the current type (AC or DC) required by the material.
• Amperage range: Under 100 amps: use 1/16-inch tungsten. 100–200 amps: use 3/32-inch. Over 200 amps: use 1/8-inch. Check the specific amperage chart for your tungsten alloy. Always verify the amperage rating for the exact tungsten you buy.
• Filler metal: For mild steel, use ER70S-6. For stainless steel, use ER308L. For aluminum, use ER4043 for general work and ER5356 for higher strength. Match the filler to the base metal alloy. If unsure, consult a filler metal selection chart or the base material spec.

Electrode Options

• Electrode: This electrode is available in standard and extended lengths and fits Cebora Plasma Prof 35HF, Cebora Plasma Prof 50, Chicago Electric Plasma 40 41952, Eastwood Versa Cut 40, and Daytona Mig Plasma Prof 35HF machines. If you own one of these plasma cutters, this electrode is a direct replacement, so you can keep cutting without worrying about compatibility.

  

Who Should Use This Guide

Best for

• Hobbyists and DIY welders who need a simple, reliable electrode for occasional TIG welding
• Professionals who want a quick reference for common materials and amperages

Not for

• Welders working on exotic alloys or specialized applications that require custom electrode selection
• Anyone needing a plasma cutter electrode—that's a different consumable category