近年来,下向焊工艺已在我国的造船、锅炉制造、管道施工等部门广泛应用,使材料、电能消耗有所降低而生产速度、产品质量得到较大幅度的提高。本文从工艺过程,经济效果等方面把下向焊工艺和传统的上向焊工艺作了对比,介绍了该工艺的特点和有待克服的问题。 In recent years, down welding technology has been widely used in shipbuilding, boiler manufacturing, pipeline construction and other departments in our country, so that materials, electricity consumption decreased and production speed, product quality has been greatly improved. This article from the process, economic effects and other aspects of the next to the welding process and the traditional upward welding technology made a comparison, introduced the characteristics of the process and the problems to be overcome.