Rehabilitation of the Case of A Reducer of the Automobile Battery Factory through Welding Processes

Osmundo Héctor Rodríguez Pérez

Faculty of Engineering, University Eduardo Mondlane, Mozambique

Abstract: The reducer is the heart of an accumulator (batteries) factory and has the essential objective of moving the mixing shafts of the mixer used for manufacturing the material used to fabricate the batteries boxes and covers. The reducer body consists of two castings: upper and lower casing, both cast, and also has a system of shafts and inner gears to perform the function for which it was designed. Due to the rupture of one of the teeth of one of the gear trains an internal pressure is produced in the equipment and a series of ruptures in the lower casing of equipment is produced, which are: No. 1 support of the bearing 4, No. 2 support of the bearing 3, No. 3 and 4 on outer body and No. 5 on inner body. The research objectives for the reducer recovery project are: study and determine the technology for reducer recovery and execution of the technology created.

In the metallographic analysis carried out under the microscope, a grey cast iron with laminar graphite of sheet size between 150-180 microns and in an amount of approximately 10% is observed, additionally it presents 2-5% of cementite which is prone to cracking. On the other hand has inclusions of oxides and large pores that are product of the technology used for manufacturing the part and were observed cracks resulting from the joints of the graphite sheets. The metal base is composed of ferrite and perlite in a 80-90%. In the project was created the rehabilitation technology for all the ruptures, this work only mentions the three namely the 1, 4 and 5.

Key words: welding, cast iron, reconditioning, technology