{
  "title": "Wind Factor: Shielding Gas Displacement Model",
  "author": "Bernardo Zubko",
  "version": "1.0.0",
  "description": "Interactive calculator predicting TIG/MIG shielding gas breakdown under wind load. Grounded in AWS D1.1 environmental limits and ASME Section IX gas coverage requirements.",
  "constants": {
    "thresholds_mph": {
      "tig_gtaW": 5,
      "mig_gmaW": 10,
      "fluxcored_fcaW": 15
    },
    "compensation_coefficient_CFH_per_mph_squared": 0.15,
    "minimum_shield_effectiveness": 0.65,
    "argon_properties": {
      "density_kg_m3": 1.784,
      "viscosity_Pa_s": 2.25e-5,
      "thermal_conductivity_W_m_K": 0.0177
    },
    "air_properties_at_20C": {
      "viscosity_Pa_s": 1.8e-5,
      "density_kg_m3": 1.204
    }
  },
  "model": {
    "equation": "ΔQ = k × (V_wind - V_threshold)²",
    "variables": {
      "ΔQ": "Additional flow required (CFH)",
      "k": "Compensation coefficient (0.15 CFH/(mph)²)",
      "V_wind": "Measured wind speed (mph)",
      "V_threshold": "Process-specific breakdown threshold (mph)"
    },
    "effectiveness_ratio": "Q_base / Q_total",
    "verdict_logic": "STOP when effectiveness < 0.65 OR wind > threshold"
  },
  "sources": [
    {
      "standard": "AWS D1.1/D1.1M:2020",
      "section": "Section 6.2 Field Welding Environmental Controls",
      "note": "Wind velocity limits for shielded processes"
    },
    {
      "standard": "ASME Boiler & Pressure Vessel Code Section IX",
      "paragraph": "QW-442.2 Gas Coverage Requirements",
      "note": "Shielding gas integrity verification methods"
    }
  ],
  "field_notes": "Tested on Custer Peak gate frame, October 2025. Plywood baffle at 30° reduced local wind from 12 to 6 mph. Argon 20 CFH maintained bead clarity after compensation.",
  "homepage": "https://bernardo-zubko.4ort.net/wind-factor.html"
}