Welded Joint Strength Calculator mechanism

Model scope

The direct fillet-weld shear equation is conditionally standard, but the instrument specification is incomplete and ambiguous for its advertised scope. It needs explicit definitions for h, L, groove-weld throat, eccentric-load and weld-group formulas, combined-stress treatment, unit conversion, and the source and applicability of allowable weld stresses before it can be verified as a complete calculator.

• The formula τ=F/(0.707h·L) is valid only for nominal direct shear in a uniform fillet weld when h is the fillet leg size, the two legs are approximately equal, and L is the effective weld length. If h already means effective throat, multiplying by 0.707 is incorrect.
• The specification claims fillet and groove weld calculations, but the supplied throat formula is only applicable to an equal-leg fillet weld. Groove-weld effective throat requires joint geometry and weld preparation details.
• No actual formulas are supplied for eccentric loading, bending, or torsion. Unit properties Iu and Ju alone are insufficient without equations such as stress from moment divided by weld-group distance and unit-property-based torsional stress.
• Combined direct shear, bending, and torsional stresses are not defined, including whether components are vectorially combined, algebraically combined, or checked separately.
• The required allowable-stress input is omitted from the listed inputs even though safety factor output requires SF=allowable weld stress/actual stress.
• The term 'AWS allowable weld stress' is ambiguous without specifying the AWS code edition, electrode classification, base-metal strength, weld type, loading mode, and whether the allowable is nominal, resistance-based, or factored.

Units and conventions

• For the metric vectors, F is in newtons and h and L are in millimetres, producing τ in N/mm², numerically equal to MPa.
• For the inch-pound vector, F is in lbf and h and L are in inches, producing τ in lbf/in², numerically equal to psi.
• h is assumed to be the equal-leg fillet weld leg size, not the already-computed effective throat.
• L is assumed to be the effective load-carrying weld length, excluding ineffective end returns or discontinuities.
• Allowable stress must use the same stress units as the calculated τ.
• The direct-load formula assumes uniform load distribution, a static load, a straight weld, and no stress-concentration, residual-stress, fatigue, buckling, or deformation checks.

Inspectable vector

One of 4 source-bound review vectors:

{
  "inputs": {
    "load_type": "direct shear",
    "F": 10000,
    "F_units": "N",
    "h": 6,
    "h_units": "mm",
    "L": 100,
    "L_units": "mm",
    "allowable_weld_stress": 180,
    "allowable_units": "MPa"
  },
  "expected_outputs": {
    "tau": 23.5738,
    "tau_units": "MPa",
    "SF": 7.6356
  },
  "working": "Effective throat = 0.707×h = 0.707×6 = 4.242 mm. Effective throat area = 4.242×100 = 424.2 mm². τ = F/area = 10000/424.2 = 23.5738 N/mm² = 23.5738 MPa. SF = allowable/τ = 180/23.5738 = 7.6356."
}

Failure boundary

BREAK_CLAIMED · SELF_FLAGGED

The zero weld-size input produces a division-by-zero undefined result and must be rejected. The zero-load case also exposes an infinite, non-finite safety-factor representation. In addition, signed-load handling is convention-dependent unless the interface explicitly distinguishes direction from stress magnitude.

Other records

Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

• VERIFIED_LEDGER.json
• evidence-tranche5/tranche5-results.json
• BOUNDARY_HAZARD_CATALOG.json