Which tungsten would work best on mild steel?

Which tungsten would work best on mild steel?

• A. EWTh-1
• B. EWTh-2
• C. EWLa-1
• D. EWLa-2

Answer: (B)

For TIG welding mild steel, you want an electrode that delivers a stable arc, easy arc starting, and good current-carrying capacity. Thoriated tungsten electrodes provide these characteristics because thorium lowers the work function and helps emit electrons readily. The 2% thorium variant offers the best balance of arc stability and electrode life at typical welding currents, giving a narrow, well-controlled arc and durable tip that resists burn-off during DC welding of steel. The 1% thorium type is capable but not as robust at higher currents. Lanthanated tungstens are versatile for both AC and DC, but for steady high-current DC welding of mild steel, the 2% thorium thoriated option generally performs best.

For TIG welding mild steel, you want an electrode that delivers a stable arc, easy arc starting, and good current-carrying capacity. Thoriated tungsten electrodes provide these characteristics because thorium lowers the work function and helps emit electrons readily. The 2% thorium variant offers the best balance of arc stability and electrode life at typical welding currents, giving a narrow, well-controlled arc and durable tip that resists burn-off during DC welding of steel. The 1% thorium type is capable but not as robust at higher currents. Lanthanated tungstens are versatile for both AC and DC, but for steady high-current DC welding of mild steel, the 2% thorium thoriated option generally performs best.