In this study, the influence of heat input and post-seam annealing (PSA) temperature on microstructure impact toughness electric resistance welded (ERWed) API X70 steel pipe was investigated. The ERW seam welds pipes were fabricated with low, moderate, high inputs, followed by PSA process at 950 ℃. Regardless input, exhibited good weldability, resulting in similar factors, i.e., metal flow angl...
