大型球罐的球壳板,一般都采用钢板压制成型后运抵现场拼装组焊,然后进行消除应力的整体热处理。由于现场的客观条件限制,往往焊接接头的焊接残余应力和拼装应力得不到完全的消除,致使焊接接头区域还存在较高的残余应力。残余应力对结构强度、断裂韧度、疲劳及抗应力腐蚀性能都将产生很大的不良影响。特别是球罐储存液化石油气 Large spherical tank shell plate, are generally used steel plate pressed to the site assembly welding assembled, and then the overall stress relief heat treatment. Due to the objective conditions of the scene, welding residual stress and assembly stress of welded joints are often not completely eliminated, resulting in higher residual stress in the welded joint area. Residual stress on the structural strength, fracture toughness, fatigue and stress corrosion resistance will have a great adverse impact. In particular, spherical tanks store liquefied petroleum gas