Credits and licences

Last updated 2026-10-11

Our own code

The tools and page layouts are written for this site. The pages make no requests to other servers.

The calculators use published data and textbook formulas, typed into our own code (no third-party tables or libraries are copied):

Lens shade numbers: minimum shades from OSHA 29 CFR 1910.133(a)(5); suggested shades are the ANSI/AWS recommendations printed in OSHA fact sheet FS-3499 (US government works, public domain).
Copper resistance: the AWG diameter definition and the IACS resistivity of annealed copper.
Electrode classifications: the AWS A5.1 / A5.5 designation system.
Welding symbols: drawn by us following the layout of AWS A2.4.
Heat input efficiency factors: ISO/TR 18491 values as published by TWI and Weld Australia; carbon equivalents: IIW, Ito–Bessyo (Pcm) and EN 1011-2 (CET) formulas.
Fillet weld allowable stresses: the 0.30 × FEXX (ASD) and 0.75 × 0.60 × FEXX (LRFD) rules of AWS D1.1 / AISC.
Melting points of pure metals: standard reference values.

None at present. If we add any library, font or data set, it will be listed here with its licence and a link (data/credits.json, rendered below).