双相不锈钢换热器管板焊缝泄漏原因OA

The holes appeared in the weld area of a fixed tube plate heat exchanger,leading to a leakage accident.The causes of weld leakage were analyzed by macroscopic observation,metallographic examination,scanning electron microscopy and energy spectrum analysis.The results show that welding defects such as porosity,looseness,and inclusions were introduced during the welding process,which became corrosion activation sites and promoted the occurrence of corrosion.The cooling rate during the welding process was too fast,resulting in a high content of ferrite in the weld area,selective corrosion of ferrite in the material,ultimately caused local corrosion of the weld and leakage.