IN2013KO01222AIN1222KO2013AIN2013KO01222AIN 2013KO01222 AIN2013KO01222 AIN 2013KO01222AIN 1222KO2013 AIN1222KO2013 AIN 1222KO2013AIN 2013KO01222 AIN2013KO01222 AIN 2013KO01222A
Authority
IN
India
Prior art keywords
predetermined
welding
nitrogen gas
increase
supplying nitrogen
Prior art date
Application number
Inventor
Shanmugarajan Balasubramani
Naidu Buvanashekaran Gengusamy
Original Assignee
Bharat Heavy Electricals
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bharat Heavy ElectricalsfiledCriticalBharat Heavy Electricals
Priority to IN1222KO2013priorityCriticalpatent/IN2013KO01222A/en
Publication of IN2013KO01222ApublicationCriticalpatent/IN2013KO01222A/en
The method comprises of arranging the nozzle for supplying nitrogen gas over the workpiece at a predetermined distance in off-axial angular position and then supplying nitrogen gas at a predetermined flow rate to stabilize the austenite phase in the weld and to achieve plasma suppression when welding is carried out at a predetermined welding speed maintaining the focal plane at a predetermined height above surface with 300 mm focal length mirror to achieve a spot size of 410µm to increase the interaction time to reduce cooling rates and to increase the formation of austenite when laser beam is defocused to improve the smoothness of the weld bead by reducing the chances of undercut at low welding speeds.