Fillet weld design – Nature of loading for parallel fillet welds\nEvaluate the statement: “Parallel fillet welds are designed for bending strength.” Select the correct response.

Introduction / Context:
Fillet welds are commonly classified by orientation relative to the applied load: parallel or transverse. Correctly identifying the governing stress (shear vs. normal) is essential for safe welding design.

Given Data / Assumptions:

• Parallel fillet weld: weld axis is parallel to the applied force.
• Design per elementary weld mechanics (throat area concept).

Concept / Approach:
When the load is parallel to the weld axis, the weld primarily resists by shear along its throat area. Conversely, a transverse fillet weld (load perpendicular to weld axis) is governed by normal (tensile/compressive) stress—sometimes loosely termed “bending” in plates.

Step-by-Step Reasoning:
Identify orientation: parallel fillet weld → shear on throat.Design equation: τ_allow ≥ P / (Σ throat areas).Bending checks are associated with eccentricities or transverse fillet welds, not the basic parallel case.

Verification / Alternative check:
Standard weld design references classify stresses by orientation; parallel fillet welds are sized on allowable shear stress of the weld metal and throat area.

Why Other Options Are Wrong:
“Agree” statements misidentify the governing stress; adding conditions (intermittent/dynamic) does not change the fundamental shear nature.

Common Pitfalls:
Confusing fillet weld orientation; neglecting eccentric loads that can introduce additional moments, which is a separate check.

Final Answer:
Disagree