前言窄间隙(以下称狭坡口)GMA焊接方法不仅是一种生产效率高、成本低、焊接接头性能优良的焊接方法,同时又是一种节省材料和能量的好方法。因此,它早已在许多领域里得到广泛使用。在研究各种狭坡口焊接方法期间,根据不同的特点而采用不同的方法,但从适用对象来看,纵焊缝、环焊缝接头可以说是属于比较简单的一种焊缝形状。换言之,这两种 Introduction Narrow Gap (Gap) The GMA welding method is not only a welding method with high production efficiency, low cost and excellent welding joint performance, but also a good method to save material and energy. Therefore, it has long been widely used in many fields. In the study of a variety of narrow bevel welding method, according to different characteristics and the use of different methods, but from the point of view of applicable objects, vertical weld, girth weld joints can be said to belong to a relatively simple weld shape. In other words, both