WeldStudio

Welding Design Analysis & Production Process
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Features & Overview

About WeldStudio

WeldStudio is a free welding engineering toolkit that runs entirely in your browser — no installation, no account, no server.

Compute arc heat input and estimate preheat temperature from steel composition.

Steel composition (wt%)

mL/100g
JIS glycerol / GB 3965 method, 1–5 mL/100g

Metallurgy & integrity screening

MPa
Parametric screening only — residual stress / phase fields require FEA (Simufact / Sysweld).

Heat Input & Preheat

V
A
kJ/mm

Interpass & multi-pass

—
kJ/mm
Interpass & multi-pass screening — AWS D1.1 / EN 1011-2 guidance.
Thermal / interpass results
Yurioka / Ito-Bessyo
–
EN 1011-2 Method B
–
CE-based guideline
–
Cooling time t₈/₅ (800→500°C)
– s
3D (thick plate)
– s
2D (thin sheet)
– s
Dominant regime
–
Thermal cycle (heat field)
Peak temperature T_peak
–
Screening analogue of FEA temperature field — Rosenthal quasi-steady 3D, valid for r>0.
Heat input (Q)
– kJ/mm
Arc energy (no η)
– kJ/mm
Max heat-input limit (WPS)
–
Carbon equivalent — IIW (CEV)
–
Carbon equivalent — AWS D1.1
–
Cracking susceptibility — Pcm (Ito-Bessyo)
–
Carbon equivalent — CET (EN 1011-2)
–
Weldability (by CEV)
–
Max hardness (HV10)
– HV
Cracking risk
–
AWS D1.1 preheat (Table 5.11)
–
Steel category
–
Cracking parameter Pc
–
Cold-cracking susceptibility (Pc)
–
Implied min preheat (Yurioka)
–
Interpass max (AWS)
–
Interpass min (preheat)
–
Est. passes
–
Cumulative heat input
– kJ/mm
Microstructure (HAZ)
– % –
Martensite-start Ms
–
Bainite (%)
– %
Ferrite + pearlite (%)
– %
Cooling rate at 540°C
– K/s –
Longitudinal residual stress σ_L
– MPa –
Restraint R (joint×level)
–
HIC risk
–
Hydrogen bake-out
–
PWHT recommended
–
Tempering temperature
–
Holding time
– min
Hydrogen diffusion & baking-out
Bake temperature
Bake hold time
min
Diffusion distance d (half-thickness)
Diffusivity at ambient D_H (amb)
– m²/s
Diffusivity at bake D_H (bake)
– m²/s
Escape time at bake (t≈d²/4D)
– min
Escape time at ambient
– min
Residual H after bake
– %
Time to ~90% escape (bake)
– min
Recommended bake
–
Diffusible-H escape time via Arrhenius D_H(T). Screening only — bake 200–350°C × 0.5–2 h per EN 1011-2 / AWS D1.5.
Weld defect risk (screening)
Atmosphere / humidity
Porosity risk
–
Lack-of-fusion risk
–
Incomplete-penetration risk
–
Qualitative heuristics only — confirm by WPS trial weld + NDT (RT/UT/MT/PT).
Screening estimates only — verify against mill certificate and applicable code (EN 1011-2 / AWS D1.1) before production.
Q = η · U · I · 60 / (v · 1000) [kJ/mm, v in mm/min]
CEV = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15
Pcm = C + Si/30 + Mn/20 + Cu/20 + Ni/60 + Cr/20 + Mo/15 + V/10 + 5B
Pc = Pcm + [H]/60 + δ/600 ; T₀ = 1440·Pc − 392 (°C, min 0)
Screening band only — follow code/WPS for qualified value.

Joining method classification

Estimate deposited metal, consumable usage, welding cost and time.

Weld Metal · Cost · Time

mm²

Weld Metal · Cost · Time

g/min
$/kg
L/min
$/m³
kW
$/kWh
$/h
min
Deposited metal weight
– kg
Consumable required
– kg
Arc time
– min
Total time (arc + handling)
– min
Gas consumed
– L
Gas cost
–
Power cost
–
Labor cost
–
Total cost
–
Cost per meter
–

Compute cross-section area, throat and weight-per-length for common joints.

Joint Geometry

°

Cross-section

Cross-section area (A)
– mm²
Throat (a)
–
Effective leg (z)
–
Volume per meter
– mm³/m
Weight per meter
– kg/m

Screening estimate of welding distortion. Not for structural validation — use FEA / test coupons for production.

Distortion Estimator

kJ/mm
mm²
Schematic — angular θ and shrinkage Δw (transverse), ΔL (longitudinal). Screening only.
Longitudinal shrinkage (ΔL)
–
Transverse shrinkage (Δw)
–
Angular distortion (θ)
– °
Severity index
–
Distortion — standard formulas
Angular distortion β
– °
Transverse shrinkage Δb
–
Longitudinal shrinkage ΔL
–
Counter-bend angle (reverse)
– °
End pre-set gap
–
Simplified screening model. For production parts, validate with FEA or test coupons and apply distortion-control measures (sequencing, fixtures, pre-bending).

Import 2D DXF or 3D mesh geometry to extract dimensions and feed the calculations.

DXF (2D)

mm
mm

3D mesh (STL / OBJ / STEP)

Drag to rotate · scroll to zoom
Format
–
Volume
– mm³
Mass
– kg
Bounding box (L×W×H)
– mm

Commercial report import (Sysweld / Simufact)

Paste a Sysweld / Simufact summary report. The tool extracts grade, thickness, heat input, preheat, interpass and process, then back-fills Module 1 / 2.

Joint performance & integrity (screening)

Parametric screening only — fatigue / fracture / distortion decisions need validated tests + FEA; verify against applicable code.

Heat input Q
– kJ/mm
Applied σ
– MPa
CEV
–
Examination
– mL/100g
Preheat T0
– °C
Thickness t
– mm

A · Strength & fatigue

kN
mm
mm
MPa
Shear τ
– MPa
Allowable τ
– MPa
Required leg
– mm
Factor of safety
– –
Efficiency η
–
Allowable σ
– MPa
Applied σ
– MPa
Factor of safety
– –
MPa
Cycles N
–
Target life
–
Allowable Δσ
– MPa –

B · Fracture toughness & transition

mm
MPa
°C
°C
Collapse Sr
–
Required δ
– mm
Material δ_mat
– mm
Risk
–
°C
FATT
– °C
NDT
– °C
Risk
–
°C
°C
Hardness drop
– %
Status
–

C · Thermal–mechanical (HAZ / buckling / sequence)

HAZ width
– mm
mm
MPa
Critical σ_cr
– MPa
Risk
–
Distortion reduction
– %

D · Process decision & sensitivity

°C
MPa
Rupture life
– h
Life (years)
– y
ProcessηH classDepositionRel. costRel. time

Summarise Module 1–6 into an AWS D1.1 / EN 1011-2 style WPS draft and screen prequalification. Draft only — a qualified person must review and sign.

WPS draft & prequalification

kJ/mm
Screening note

Invert measured weld-pool dimensions into Goldak double-ellipsoid source parameters. Forward view shows the fitted molten-pool shape.

Heat-source calibration

mm
mm
mm
V
A
%
mm/min

Generate a screening CCT diagram from composition, then overlay the real t8/5 cooling path from Module 1.

Parametric CCT diagram

Auto-filled from Module 1 (composition, preheat, t8/5)
Pearlite nose time
–
Ms (martensite start)
–

NDT recommendation

Filler-metal match

Groove comparison

↳ M2
°↳ M2
↳ M2
↳ M2
↳ M2
Settings & persistence