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聚氯乙烯单体计量槽使用半年多以后,发现有渗漏现象.经着色和X射线探伤确定,焊接接头存在着纹.经分析,该容器的焊接接头在晶间裂腐蚀和应力腐蚀的综合作用下产生了微裂纹.容器材质为1Cr18Ni9Ti奥氏体不锈钢,焊接时采用φ3.2mm.的A102焊条,焊前烘焙1.5h,采用80~100A的直流电源施焊,坡口为V形,坡口左右100mm范围内用钢刷清理干净.工艺评定试板的力学性能和金相组织试验均合格.容器制作过程中,由于生产上急待使用,所
After more than six months of using PVC monomer metering tank, it was found that there was a leakage phenomenon.According to the color and X-ray inspection, there was a pattern of welded joints.Through analysis, the welded joints of the container were intergranular cracking and stress corrosion The micro-cracks produced under the action of the container material 1Cr18Ni9Ti austenitic stainless steel, welding φ3.2mm. A102 electrode baking 1.5h before welding, using 80 ~ 100A DC power supply welding, bevel V-shaped slope 100mm within the scope of the mouth with a steel brush to clean up the mechanical evaluation of the test board and the microstructure and texture tests are qualified container manufacturing process, due to the urgent use of production,