PROCESS FAILURE MODE AND EFFECT ANALYSIS ON TIG WELDING PROCESS- A CRITICALITY STUDY

Failure Modes and Effects Analysis (FMEA) is methodology for analyzing potential reliability problems early in the development cycle where it is easier to take actions to overcome these issues, thereby enhancing reliability through design. FMEA is precisely an analytical methodology used to ensure that potential problems have been considered and addressed throughout the product and process development cycle. A process or a design should be analyzed first before it is implemented and also before operating a machine the failure modes and effect must be analyzed critically. In this work, process failure mode and effect analysis is done on general TIG welding process. A series of welding with different sample pieces are done and the potential failures and defects of the work piece are categorized based on FMEA, risk priority numbers are assigned to each one and by multiplying the ratings of occurrence, severity and detection. Finally the most risky failure according to the RPM numbers is found and the cause and effects along with the preventive measures are tabulated. This work serves as a failure prevention guide for those who perform the welding operation towards an effective weld