Spot Weld Strength Calculator

Calculate spot weld shear strength based on nugget diameter and material

Base metal affects the ultimate shear strength of the spot weld nugget.
Diameter of the weld nugget. Rule of thumb: nugget dia = 5 x sqrt(thinnest sheet thickness in mm).
Thickness of the thinnest sheet in the joint. Strength is limited by the thinner sheet.
spots

Results

Shear Strength per Spot-lbs
Shear Strength per Spot-N
Total Joint Strength-lbs
Nugget Area-in²
Min Nugget Dia (rule of thumb)-mm
References: AWS C1.1 Resistance Welding; shear strength approx 60% of UTS. Nugget rule of thumb: d = 5*sqrt(t) per AWS/ISO standards.