The US Customary Fillet Weld Leg Size from Heat Input Calculator uses the amount of heat or thermal energy that is introduced to a material and the typically accurate relationship between heat input and rounded fillet weld size to find the predicted leg size.
INSTRUCTIONS: Choose units and enter the following:
- (H) Heat Input (kJ/in)
Leg Size (ω): The calculator returns the answer in inches. However this can be automatically converted to compatible units via the pull-down menu.
To find the weld leg size with metric units, try: Metric Fillet Weld Leg Size from Heat Input Calculator
The Math / Science
Arc voltage, current, and travel speed directly affect heat input. Heat input is often associated with cooling rates of the heat-affected zone and the weld. Heat input is also directly proportional to the individual weld bead cross-sectional size. For example, the size of a fillet weld increases as the heat input increases.
To find the leg size, use the formula:
ω = √ (H/500)
where:
ω = weld leg size
H = heat input
Welding Calculators and Constants
- Bend Allowance Calculator
- Weight of Aluminum Square Bars
- Steel Wire Deposition Rate Calculator
- Welding Heat Input Calculator
- Groove Weld Potential Root Cracking Calculator
- Weight of Hot Rolled Steel Flats
- Modulus of Elasticity for Martensitic Stainless Steel
- Brinell Hardness of Gray Cast Iron
References
Tools for Reviewing Welding Procedures (https://app.aws.org/mwf/attachments/11/253611/TOOLSFORREVIEWINGWELDINGPROCEDURES.pdf)
Bridge Welding Reference Manual (https://www.fhwa.dot.gov/bridge/steel/pubs/hif19088.pdf)