No casualties were reported.
The blaze erupted yesterday around 4 pm on a corner side of the Hitech City station, an official of the L&T Metro Rail (Hyderabad) Ltd, the concessionaire developing the 72-km elevated project, said.
A purported footage of the flames at the station went viral on social media.
Hyderabad Metro Rail Limited Managing Director N V S Reddy said that while the welding work was being done last evening, some sparks caused a small fire.
The Hitech City station comes under corridor-3 of the Metro project.
Prime Minister Narendra Modi inaugurated the first phase of the 72-km long elevated Metro project at Miyapur station here on November 28 last year.