1 前言 随着大型石油、化工装备国产化工作的进展,我国自行设计制造的大直径(φ>240mm)、大壁厚(δ>70mm)压力容器越来越多。由于条件的限制,一些球型、椭圆型封头往往不能整体压制成形,需采取分瓣冲压拼焊的方法。对于这类封头的瓣片拼焊,从生产效率、节能、焊接质量及辅助焊接工装的配置等方面综合考虑,电渣焊当为首选工艺。例如熔嘴、管状熔 1 Introduction With the progress of localization of large-scale oil and chemical equipment, more and more pressure vessels of large diameter (φ> 240mm) and large wall thickness (δ> 70mm) are designed and manufactured by our country. Due to the limitations of the conditions, some spherical, oval-shaped head often can not suppress the overall shape, the need to take part stamping welding method. For such a head flap welding, from the production efficiency, energy saving, welding quality and the configuration of the auxiliary welding tool and so comprehensive consideration, as the preferred process of electroslag welding. For example, melting nozzle, tubular melting