Research Of Repairing The Abraded Shafts Of MB40 Filter Using Laser Processing Technology

In this paper we used laser technology in repairing the abraded shafts of MB40 filter on the base of invalidation analysis. Because repaired-layer is deep (6-8mm), we adopted laser overlaying welding technology to resume its dimension and used laser alloying technology to strengthen its surface. This research including study of the repair techniques and the analysis of micro structure, wear-resistant, eroding-proof, provides a new method and academic foundation for deep-layer repairing of abraded shafts.The repairing was conducted using a 7KW crosscurrent and continuous wave CO₂ laser system. We used argon as protecting gas and used automatic powder-feed technology. The major overlaying welding parameters are as follows, laser power is 3 KW, laser scanning speed is 0.2m/min. To improve the performance of shaft, we adopted laser alloying technology after laser overlaying welding. At last, to get a good precision of dimension, we turned the pump shaft to its working dimension.We analyzed the metallography microstructure of repairing layer using metallography microscope, tested its micro hardness using HXD-1000 micro hardness instrument, tested its abrasion-resistant on MPX—2000 abrasion experiment machine, tested its eroding-proof at the same situation.The results of these tests prove that repairing layer has a good performance. The hardness of filter shaft increases by 2 times, abrasion-resistant increases by 1.2 times, eroding-proof increases by 1.5 times. The running of MB40 filter is normal. The...