渣孔，由于型腔内杂质或液体内的低熔点物质进入型腔引起的孔洞，形状不规则，深度较浅，孔内表面光滑并有光泽、色彩，近似于釉质的物质。它是铸件上出现最频繁的表面缺陷。只有当孔眼较大，凭眼睛观察孔眼中夹杂物的色泽才有可能分辨出来是砂子还是渣子。虽然能够用扫描电子显微镜和能谱分析装置进行判断，绝大多数工厂无此检验条件。
三角口裂纹、直线裂纹和渣孔是连铸坯表面夹渣的主要表现形式。
Triangle crack, linearity crack and slag eye are main form of surface wrapped slag in continuously cast billet.
用此工艺焊补铸件，焊补区域与基体间没有明显的熔合线，无渣孔、气孔等缺陷。
By using this process to repair castings, there is no obvious separating line, no slag inclusion and gas hole between the welding zone and base metal.
前言： 湿砂型铸铁件产生砂孔和渣孔缺陷的主要原因是：（1）芯头或砂台的间隙偏小；
The reasons causing sand inclusion and slag inclusion are: ( 1 ) gaps between mould and core prints or cods too small;
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