Fillet-weld throat & stress API

Computes the 0.707·leg throat, weld stress on the throat plane, factor of safety and the required leg size for an allowable stress. Answers 'What stress is in my fillet weld?', 'What leg size do I need for this load?'.

Price$0.04per request

MethodPOST

Route/v1/engineering/weld-fillet-stress

StatusLive

MIME typeapplication/json

Rate limit120/minute

Cache0s public

fastenerweldfillet-weldthroatweld-sizeshearconnectionmachine-design

API URLhttps://x402.hexl.dev/v1/engineering/weld-fillet-stress

Integration docs

Example request

{
  "legSizeMm": 6,
  "weldLengthMm": 100,
  "loadN": 30000,
  "allowableStressMpa": 100
}

Example response

{
  "throatMm": 4.242,
  "throatAreaMm2": 424.2,
  "weldStressMpa": 70.7214,
  "formula": "t = 0.707·w, τ = F/(t·L)",
  "interpretation": "Fillet welds fail on the 0.707·leg throat plane; check against allowable shear, not tensile.",
  "factorOfSafety": 1.414,
  "requiredLegSizeMm": 4.2433,
  "adequate": true
}

Input schema

{
  "type": "object",
  "required": [
    "legSizeMm",
    "weldLengthMm",
    "loadN"
  ],
  "properties": {
    "legSizeMm": {
      "type": "number",
      "examples": [
        6
      ]
    },
    "weldLengthMm": {
      "type": "number",
      "examples": [
        100
      ]
    },
    "loadN": {
      "type": "number",
      "examples": [
        30000
      ]
    },
    "allowableStressMpa": {
      "type": "number",
      "examples": [
        100
      ]
    }
  }
}

Output schema

{
  "type": "object",
  "additionalProperties": true
}