The macro and micro structure,fracture morphology and chemical composition of the cracked deck fillet weld were analyzed by means of non-destructive testing,optical microscope,scanning electron microscope and EDS energy spectrometer.Results showed that the crack section of deck fillet weld has no metal lust-er,accompanied by high temperature oxidation color,and there are more slag inclusions inside;a large num-ber of muddy liquid films are found on the crack section,and low melting point sulfides are enriched in it.Therefore,it is a typical hot crack.Improper implementation of the welding process is the main reason for the cracks in the fillet weld.
关键词
角焊缝/热裂纹/失效原因/焊接工艺
Key words
fillet weld/hot cracking/cause of failure/welding process
维普
万方数据