Weld Dilution Ratio
Weld dilution = melted base-metal area / total deposit area, the base-metal fraction of the deposit. A structural single-pass weld runs 30-40% (A_base 0.03, A_filler 0.05 -> 37.5%); a hardfacing overlay is kept low (16.7%) so the alloy stays near the filler. The WPS and filler data govern.
Formula and source
dilution = A_base / (A_base + A_filler) x 100; filler_share = 100 - dilution.
The standard welding-metallurgy weld-dilution definition, by name.
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