Numerical simulation on discontinuous welding of a hot tap structure

The temperature field and residual stress distribution of discontinuous welding on an orthogonal nozzle were simulated and comparied with the results of continuous welding.It can be concluded that the local high temperature can be reduced effectively using the technique of discontinuous welding and smaller residual stresses are obtained.The metallographic analysis shows that the metallurgical structure is proper.The results of internal pressure test indicate that the hot tap structure can work safely.