According to the causes,the surface defects can be divided into blister containing non-metallic inclusion,blister without non-metallic inclusion and “raindrop”,“gills”，“mountained”.
不
有
金属夹杂的气囊表面
陷；由气泡产生的“雨点”状表面陷；“鱼鳞”状表面陷；“山水画”状表面陷。
According to the causes,the surface defects can be divided into blister containing non-metallic inclusion,blister without non-metallic inclusion and “raindrop”,“gills”，“mountained”.
不有金属夹杂的气囊表面陷；由气泡产生的“雨点”状表面陷；“鱼鳞”状表面陷；“山水画”状表面陷。
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