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task library
built templatesteel-specificationwith-tool

Carbon Equivalent Calc

Calculates the International Institute of Welding carbon equivalent from steel chemistry using CE = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15. The template reports numeric margins to weldability thresholds and a deterministic preheat indicator for first-pass steel specification checks.

inputs

9 fields

context

3 archetypes

engine

with-tool

outputs

5 scored fields

contract fields

Parameter Map

9 inputs to 5 scored outputs

  • carbon_pct

    float

    Carbon content C

    0.02 to 0.35%

  • manganese_pct

    float

    Manganese content Mn

    0.2 to 1.8%

  • chromium_pct

    float

    Chromium content Cr

    0 to 1.5%

  • molybdenum_pct

    float

    Molybdenum content Mo

    0 to 0.6%

  • vanadium_pct

    float

    Vanadium content V

    0 to 0.25%

  • nickel_pct

    float

    Nickel content Ni

    0 to 2%

  • copper_pct

    float

    Copper content Cu

    0 to 0.8%

  • caution_threshold_pct

    float

    Carbon equivalent threshold where preheat review is indicated

    0.3 to 0.5%

  • high_risk_threshold_pct

    float

    Carbon equivalent threshold for high weldability risk

    0.45 to 0.7%
carbon_equivalent_pcttol 0.03

IIW carbon equivalent CE

caution_margin_pcttol 0.03

Margin above the caution threshold

high_risk_margin_pcttol 0.03

Margin above the high-risk threshold

weldability_risk_indextol 0.01

Numeric weldability risk class: 0 low, 1 caution, 2 high

preheat_indicatedtol 0.01

Numeric preheat indication: 0 no, 1 yes

visibility contract

Difficulty Ladder

all_giveneasy

All chemistry and thresholds given for low-carbon steel

all fields visible
all_givenmedium

All chemistry and thresholds given across common structural steels

all fields visible
all_givenhard

All chemistry and thresholds given for higher-risk repair welding cases

all fields visible

scenario bands

Archetype Atlas

low_carbon_plate

2 contexts

Low-carbon structural plate with low alloy content

carbon_pct0.08 to 0.16
manganese_pct0.6 to 1.2
chromium_pct0 to 0.2
molybdenum_pct0 to 0.08

building-frame-steel / bridge-secondary-steel

hsla_plate

2 contexts

High-strength low-alloy plate with moderate alloy content

carbon_pct0.12 to 0.22
manganese_pct1 to 1.7
chromium_pct0.1 to 0.6
molybdenum_pct0.02 to 0.25

crane-runway-girder / heavy-industrial-platform

repair_welding_unknown_origin

2 contexts

Repair welding material with elevated alloy content

carbon_pct0.18 to 0.3
manganese_pct1.2 to 1.8
chromium_pct0.3 to 1.2
molybdenum_pct0.05 to 0.4

brownfield-plant-repair / marine-structure-repair

rendered task

Generation Preview

crane-runway-girder-hsla-plate-preview

difficulty
hard
visibility
all_given
archetype
hsla_plate
site context
crane-runway-girder
instruction excerptcarbon-equivalent-calc_calc.py

visible fields

  • carbon_pct0.12 to 0.22 %
  • manganese_pct1 to 1.7 %
  • chromium_pct0.1 to 0.6 %
  • molybdenum_pct0.02 to 0.25 %
  • vanadium_pct0.02 to 0.12 %
  • nickel_pct0.1 to 0.8 %
  • copper_pct0.05 to 0.35 %
  • caution_threshold_pct0.38 to 0.45 %
  • high_risk_threshold_pct0.55 to 0.65 %

withheld schema

carbon_equivalent_pctcaution_margin_pcthigh_risk_margin_pctweldability_risk_indexpreheat_indicated
High-strength low-alloy plate with moderate alloy content. crane-runway-girder. Required outputs: carbon_equivalent_pct, caution_margin_pct, high_risk_margin_pct, weldability_risk_index, preheat_indicated