Behaviour of semi-elliptical cracks in welds with yield strength mismatch; An analysis of fracture under biaxial loading using the finite element method; Assessment of the significance of LBZs in steel using a probabilistic model; A review of HAZ toughness evaluation; An introduction to K, CTOD and J fracture mechanics analyses and toughness, and the application of these to metal structures; Update on fracture toughness test methods for welded joints.