1. The document discusses the design of various welded joints, including butt joints, transverse and parallel fillet joints, and circular fillet joints subjected to torsion. It provides the equations to calculate the permissible load or torque based on the weld material properties and joint geometry. 2. Examples of design calculations are provided for parallel fillet joints subjected to load and transverse fillet joints. Design stresses for welds using bare and covered electrodes are also tabulated. 3. Review questions at the end test the understanding of welded joint design, and examples are worked out for fillet joints subjected to load and a circular fillet joint subjected to torque.