However, since annual examinations are going on, he could not take classes.
Students clapped and his colleagues shook hands as the lecturer, who is recovering from the shock of his wife Salomi's suicide few days ago, rejoined service.
Joseph, head of the Malayalam department, was suspended from service following the controversy over framing of a question paper in 2010.
The hand was later sutured back and he slowly recovered from the brutal attack.
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The family was going through tough times with the sole bread winner having no job. Salomi (48), who stood by Joseph during his trying times, last week ended her life as the family was facing severe financial problems.
Within days of her death, the college decided to take him back before his retirement on March 31.