1.目的大型机件一般都是由许多块钢板组合而成,并大部分都必须焊接在一起,这样就会出现各种类型的焊缝。大体上可分平焊、横焊、竖焊和仰焊,而横、竖、仰的位置的焊接比平焊复杂,进行这类焊接必须有高超的焊接技术,否则不易掌握,使焊缝产生不同的缺陷,如:绞边、焊缝下偏、焊瘤 1. Purpose Large parts are usually made of many pieces of steel plate and most of them must be welded together so that various types of welds will appear. Generally can be divided into flat welding, cross welding, vertical welding and Yang welding, and horizontal, vertical, Yang welding position than flat welding complex, such welding must have superb welding technology, or not easy to grasp, so that the weld Different defects, such as: edge twist, weld under the partial, welding tumor