Welding Residual Stress Distributions in the Thickness Direction under Constraints Using Neutron Diffraction and Contour Methods

Using high-strength steel for offshore structures with a yield stress of 500 MPa, this study evaluated the distribution characteristics welding residual in thickness direction under influence constrained conditions during using cutting, neutron diffraction, and contour methods. Welding inevitably occurs impacts fracture stability structures. As better reflects effects phase transformation, behavior is known to differ from that general steel. This fabricated fully unconstrained specimens them identical evaluate according constraints on welds. The results indicated maximum tensile specimen occurred first layer weld joint, while last joint. Additionally, was larger. Although some errors values depending measurement method, both methods applied exhibited nearly distributions. Meanwhile, angular deformation about 6° specimen, we considered decreased owing occurrence deformation. generally degree stress. When greater than occurs, it changes plastic range appears form angular, longitudinal, lateral Under condition, reduced appear around 42% compared at time, approximately occurred. Therefore, estimated an distortion 2.4° as 100 MPa decreases.