So the control of the welding parameter such as welding pressure, gas flux, upsetting length is realized, and the system has a high dynamic response rapid and a high control precision.

This article introduce the application of mobile rail gas pressure welding technology in the track maintenance of Shanghai Metro, and bring forward this technology is applicable and worthy to spread.

The flame normalizing treatments were put forward on steel rail with flash welding, gas pressure welding and aluminium heat welding.