AISC Weld Guide

Basic Calculations (E70XX)

The strength of a linear fillet weld is based on the effective throat area (0.707 × size). For standard E70 electrodes:

• Unit Strength: A 1/16" leg weld has an allowable strength (ASD) of 0.928 kips per inch.
• Example: A 3/16" weld is 3 × 0.928 = 2.78 kips/in.

Transverse Loading Bonus

Per AISC J2.4, welds loaded perpendicularly (90°) to the weld axis are stronger than welds loaded longitudinally.

• Equation: F_nw = F_EXX × (1.0 + 0.50 × sin^1.5θ)
• 90° Load: Provides a 50% increase in nominal strength compared to parallel loading.