气缸体出现裂纹有两个原因,一是北方寒冷地区由于驾驶员的疏忽,出车以后忘记放水发生冻裂,这种裂纹一般出现在边盖附近,横向开裂。二是气缸体遭受意外撞击或材料本身缺陷引起,裂纹出现在缸体受力集中的薄弱部位(见图1)。在气缸体冷焊过程中,工艺要求严格,难度较大,稍有差错,焊后极易出现二次裂纹和气孔。 Crack cylinder there are two reasons, one cold area in the north because of the driver’s negligence, forget the release of water after the release of the fissure, the cracks generally appear in the vicinity of the edge of the cover, horizontal cracking. Second, the cylinder body suffered accidental impact or material defects, cracks appear in the weak parts of the cylinder stress concentration (see Figure 1). In the cylinder body cold welding process, the process is strict, more difficult, a little error, prone to secondary cracks and pores after welding.