Determination of Weld Loads and Throat Requirements Using Finite Element Analysis with Shell Element Models — A Comparison with Classical Analysis

Finite element analysis (FEA) has become a practical method of predicting stresses and deflection for loaded structures. FEA accurately identifies the load path, which can be difficult using classical analysis with complex structures. FEA shell element models are effective for predicting loads in weldments fabricated from plate, sheet, structural shapes and tube. The formulation used for a finite element shell model is that of full penetration welds at every joint. Although the loads carried through joints are calculated by FEA, they are not readily presentable. This article presents a method to derive the loads at weld joints from the stress results of FEA shell element models. Additionally, using the calculated weld loads, weld throat stresses or size requirements are calculated using classical methods.