Shot peening is a cold-working process that involves bombarding the surface of a material with small spherical media, known as shots. 
 
https://sfecindia.net/shot-peening-machine.html 
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 Shot peening is a cold-working process that involves bombarding the surface of a material with small spherical media, known as shots. 
 
https://sfecindia.net/shot-peening-machine.html 
https://sfecindia.net/robotic-....shot-peening-machine