FCAW electrodes such as E70T-3 (3/32) and E70T-10 (0.045) have a deposition efficiency rate of:

• A. 78%
• B. 88%
• C. 92%
• D. 100%

Answer: (B)

Deposition efficiency is the portion of electrode material that actually becomes weld metal, versus being lost to slag, fume, or spatter. For flux-cored FCAW electrodes like E70T-3 and E70T-10, the flux inside helps produce a stable arc and good weld metal, but some of the electrode is consumed to form slag and other losses. That keeps the efficiency in the high 80s rather than at 100%.

88% sits in the commonly cited range for these electrodes, reflecting typical performance across standard welding conditions. The other numbers would require unusually high or low losses: 100% isn’t realistic because slag and vaporized metal remove some material from becoming weld metal; 78% would be unusually low for FCAW; 92% is higher than the typical value for these common E70T electrodes.

So the best answer is 88%, representing the real-world efficiency you’d expect when estimating electrode usage and weld metal deposition.