Satellite hardfacing of mild steel using robotic mig welding

Hardfacing is carried out to enhance the hardness of the surface of a substrate by depositing a hard and wear resistance filler metal. It is a more cost-effective to construct it out of regular steel and then coat the important layer of welded metal that can ensure the required hardness at the surface. A hardfacing system was developed by employing Robotic Gas Metal Arc Welding for the hardfacing of Stellite 21 on the Mild steel substate. The various components of the hardfacing system and the detailed procedure of hardfacing including the programming the robot, setting the process parameters, conducting the experiments as per Taguchi L9 array and the measurement of hardness were explained. Hardfacing trial 5 gave the maximum hardfacing deposit hardness of 499 Hv.