A vertical watertube steam boiler explosion accident occurred in an enterprise,a series of tests were carried out on the failed boiler samples,such as wall thickness measurement,metallographic analysis,hardness test,tensile test,chemical composition analysis and fracture analysis.The analysis results showed that no abnormality was found in the mechanical properties,metallurgical analysis and thickness of the boiler wreckage samples,and serious defects such as incomplete welding and slag inclusion were found in the patch welding plate.The thickness of the weld between the patch plate and shell was far less than the nominal thickness of the shell.The tear fracture morphology of the patch welding boiler body was toughness fracture,the boiler exploded and failed due to insufficient strength of the replaced patched plate.
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