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maintenance is routine work depend in known period.
repair is restoring the original case of the element design which damage by unexpected force.
strength is adding new material to the element to increase the force resistance which is not calculated at design
this answer is based on maintenance management point of view
Maintenance can be corrective, preventive, predictive or RCM which is combination of the three.
corrective maintenance is the repair maintenance
so repair maintenance (corrective maintenance) is one of the methodologies used in maintenance management
Maintenance is to maintain the running condition of a machine (technical) by keeping it clean or re tune them, calibrate them etc, Repairing is to carry out the fault of the machine once the damaged or broken and strength of the Machine is to output and working capability of the machine.
