Failure Mode Effect Analysis and Parameter Op...

Failure Mode Effect Analysis and Parameter Optimization of Projection Welded Joints

Author Name : Naveen Ghanghas, Sanjeev

ABSTRACT:  Projection welding using capacitor discharge projection welding machine is gaining popularity in production of sheet metal works in industry. It is one of the most economical methods of projection welding ever known. Projection welding is widely used in fabrication of pump impellers for bottling plants, milk plants and fabrication of automobiles bodies in auto industry. The quality of projection welded joint plays a vital role in the durability and performance of pump impeller. Therefore, it becomes important to study the process parameters involved in the production of projection welded pump impellers, so that the quality of impellers improved and rejection rate due various reasons may reduced. M/s Flowguard, Gurgaon is engaged in production of multistage mineral water pumps with an increasing turnover, 8.7 crores last year. Main factors causing rejection of impeller were power, wear & tear welding electrode, improper cleaning of impeller plates and weak strength of the welded joint. Failure mode effect analysis (FMEA) was done to determine the risk priority number (RPN) against each cause and factor with higher RPN was selected for improvement.