Heat Input β€” Q = (V Γ— I Γ— 60) / (S Γ— 1000) [kJ/mm]
Arc Energy
β€”
kJ/mm
Heat Input (corrected)
β€”
kJ/mm
Heat Input
β€”
kJ/in
CSA W59 / AWS D1.1: Arc Energy = (VΓ—IΓ—60)/(SΓ—1000). Heat Input = Arc Energy Γ— Ξ·. Typical limits: 35–70 kJ/in for structural. Low-hydrogen SMAW: max 50 kJ/in.
Interpass Temperature Check
Delta to Limit
β€”
Β°C remaining
Interpass Status
β€”
check
Fillet Weld Capacity (CSA W59 / AWS D1.1)
Throat a
β€”
mm
Weld Area
β€”
mmΒ²
Shear Stress Ο„
β€”
MPa
Capacity Vr
β€”
kN
Effective throat = 0.707 Γ— leg. CSA W59: Vr = 0.67 Γ— 0.707w Γ— Lw Γ— 0.67Fu. AWS D1.1: Vr = 0.3 Γ— Fu Γ— 0.707w Γ— Lw. Direction factor per AWS: (1.0 + 0.50 sin¹·⁡θ).
Minimum Fillet Weld Size (AWS D1.1 Table 5.8)
Base Metal Thickness (t)Min. Fillet Size
t ≀ 6 mm (1/4")3 mm (1/8")
6 < t ≀ 12 mm (1/2")5 mm (3/16")
12 < t ≀ 19 mm (3/4")6 mm (1/4")
t > 19 mm (3/4")8 mm (5/16")
Max fillet weld size: along edge < 6mm β†’ max = t; along edge β‰₯ 6mm β†’ max = t βˆ’ 2mm. Do not exceed base metal thickness.
Preheat Temperature β€” Carbon Equivalent (CET)
IIW CE
β€”
%
CET (Thyssen)
β€”
%
Min. Preheat Tp
β€”
Β°C
HAZ Risk
β€”
cracking
IIW CE = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15
CET = C + (Mn+Mo)/10 + (Cr+Cu)/20 + Ni/40
Tp (Β°C) = 697Γ—CET + 160Γ—tanh(t/35) + 62Γ—HI^0.5 βˆ’ 328 (Thyssen method, CSA W59 Annex B)