Residual stresses, distortions and their mitigation for fusion welding

The objective of the book is to study the thermo-mechanical behavior of the fusion welding procedure in the shipbuilding industry. Here, a new way of generalized heat source model using the regression equations was developed for the Submerged Arc Welding (SAW) which can be replicated for other welding procedures as well. The effect of welding interruptions on the residual stress was carried out in this book and thereafter, it was co-related with preheat phenomenon. An elastic method was developed based on various welding forces.This was further extended to an elastic transient welding force method. Four large orthogonal stiffened panels were welded by using GMAW to study the effect of welding sequences.Finally, to reduce the welding induced buckling distortion, an in process distortion control method called Thermo Mechanical Tensioning (TMT) was introduced, which was extensively experimented both in laboratory and in full scale in Shipyard. This TMT procedure was also numerically investigated to understand the residual stress development during the process.