Diluted Weld Deposit Composition
The as-deposited content of one alloy element after dilution.
Example
You enter
- Dilution D (%, from the weld-dilution tile) 30
- Element content in filler (%) 23
You get
- Deposit content (as-welded) 16.1%
- Filler contribution (%) 16.1
- Shift from the filler nominal -6.9
No published worked example is on file for this calculation. It is checked against a hand-worked derivation of its method.
Details, formula, and sources
ScopeDeposit% = D x base% + (1 - D) x filler% (D the dilution fraction). A 309L filler at 23% Cr onto carbon steel (0% Cr) at 30% dilution deposits only 16.1% Cr -- below the ~18% a 304-equivalent surface needs, which is why overlays run a low-dilution first layer or a second pass. Run it per critical element (C, Cr, Ni). One element, one pass; microstructure and ferrite come from a Schaeffler/WRC diagram. The WPS, filler certs, and base-metal MTR govern.
Formula or tabledeposit% = D x base% + (1 - D) x filler%; base_contribution = D x base%; filler_contribution = (1 - D) x filler%; shift = deposit% - filler% (D = dilution/100).
Source and editionThe standard welding-metallurgy dilution mixing rule for the as-deposited alloy composition, by name.
Free accessThe dilution mixing rule is a standard welding-metallurgy relation in AWS references and filler-metal literature; the base and filler chemistries are the user's own MTR/cert values. The WPS and the filler-metal data govern.
What governsEstimate. AHJ and licensed professional govern.
API field namesdilution_pct, filler_pct, deposit_pct, filler_contribution_pct, shift_from_filler_pct
- Mixing rule deposit% = D x base% + (1 - D) x filler%welding metallurgy / AWS
- Dilution source D is the dilution fraction from the weld-dilution tilewelding metallurgy
- Overlay lesson dilution pulls the deposit toward the base; overlays use over-alloyed filler (e.g. 309)welding practice
- Scope one element, one pass; not microstructure/ferrite (Schaeffler/WRC)scope of this tile