Q.Why steel is preferred in making Robots?

Robot bodies are most commonly built from aluminium and steel: aluminium is a softer metal and therefore easier to machine and work with, while steel is several times stronger, and because of the inherent strength of metal generally, robot bodies are typically built up from sheet, bar, rod, channel and other structural shapes -- steel in particular is preferred wherever a robot's frame needs to resist heavy loads or repeated stress without deforming. Robotics carries clear advantages: robots are much cheaper than humans over time, never get tired and can work 24x7 (reducing workplace absenteeism), are more precise and error-free, are stronger and faster than humans, can operate in extreme environments (extreme heat/cold, space, underwater) and in outright dangerous situations (bomb detection and deactivation), can save human lives in warfare by taking on the most hazardous roles, and are heavily relied on to handle materials in chemical industries -- especially nuclear plants -- where direct human handling would create serious health hazards. Set against these are real disadvantages: robots have no sense of emotion or conscience and lack empathy, which can create an emotionless workplace; if robots did all the work while humans only monitored them, health hazards from an increasingly sedentary, disengaged workforce would ris …