TWI Industrial Membership Report Summary 782/2003
There is demand from industry for reducing the size of the heat treated zone, either to protect existing connections and heat sensitive attachments or to reduce the energy consumption. However, the temperature gradients can be harmful and this project was undertaken to investigate the effect of patch heat treatment on residual stresses using finite element analysis.
- To determine the magnitude of residual stresses resulting from local patch PWHT
- To compare these stresses with those obtained using circumferential band PWHT
- To determine suitable procedures for local patch PWHT at branch connections
- To compare the results between elastic analysis and elastic-plastic and relaxation analysis