Abstract: In response to the crack problem of the 110t converter shell trunnion seat in a certain steel plant, the characteristics of the cracks, the reasons for the cracks and the welding performance of the trunnion seat are compared and analyzed in this article, and a cold welding repair scheme using the Austenitic stainless steel material is then made. After the welding repair verification, the welding repair problem of the converter shell trunnion seat has been solved, which has reference significance for welding repair of the similar base material.