The traditional method for accessing bogies was to lift the car body off the bogies by use of an overhead crane or cranes as shown in the left hand photo below.
Cracks occurred in the main weld joining the web and upper wing panel of an overhead crane girder of I-section, some of which have expanded to the structure material and even led to girder fracture.
It is proved by practice that the new process is a effective heat treatment method for producing the travelling wheel of heavy overhead crane.
QZ type general overhead crane, grab crane for coal cinder handing, garbage handing.
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