化工压力容器制造监检常见质量问题及改进措施

Common Quality Problems and Improvement Measures of Chemical Pressure Vessel Manufacture Supervisory Inspection

为提高化工压力容器产品制造质量,梳理了日常监检工作中常见质量问题,在质量保证体系方面有资料审查问题、原材料控制问题,改进措施为加强质量保证体系运行状态监督并建立内部审核制度;制造过程常见质量问题有接管焊接接头热裂纹缺陷、环向焊接接头咬边缺陷及焊接气孔缺陷等,改进措施分别为细化晶粒、控制铁素体含量小于5%;控制适宜的焊接电流、焊接电压及焊接速度;采用碱性焊条、焊前清除坡口表面油污等杂质。

In order to improve the manufacturing quality of chemical pressure vessel products,we have sorted out the common quality problems in the daily supervision and inspection work.There are data review problems and raw material control problems in the quality assurance system.The improvement measures are to strengthen the supervision of the operation status of the quality assurance system and establish an internal audit system.Common quality problems in the manufacturing process include hot crack defects in the welded joints of the takeover,undercut defects in the circumferential welded joints and welding porosity defects,etc.The improvement measures are to refine the grains,control the ferrite content to be less than 5%,control the appropriate welding current,Welding voltage and welding speed;when use alkaline electrodes,to remove impurities such as oil stains on the groove surface before welding.