CRACKING ANALYSIS OF ENCAPSULATED ROLLER

The cracking encapsulated roller in use was analyzed by means of chemical composition,macrostructure and microstructure examination and mechanical property test. The results showed that counterweight had been welded wrongly in inwall of roll cylinder,the microstructure of roll cylinded,mechanical property and stress state had been changed. In frequent bending stress condition,fatigue cracking occurred due to the cracking source had been initiated in welding heat affected zone.