Product Quality Analysis for UGL Train Type 50 FT Using Six Sigma Method &Failure Mode and Effect Analysis at PT. INKA Multi Solusi

Abstract

PT. INKA Multi Solusi is a subsidiary of PT. Industri Kereta Api is engaged in
manufacturing services, manufacture, and trade of spare parts and products for
land transportation and the manufacture of railway components according to
customer specifications. The product currently being worked on is the type 50 FT
flat carriage (UGL) product ordered by the KiwiRail company, Australia, with total
production from November 2022 to April 2023 of 791 carriages with a total of
1582 headstock arrangements and a total of 408 units of defects. This study aims
to determine product quality and provide suggestions for improving the quality of
welding joints for UGL type 50 FT train products. This study uses the Six Sigma
method and Failure Mode and Effect Analysis (FMEA). The study result shows
that the average Sigma value based on total defects from November 2022 to April
2023 is 3.16, which means that the six sigma target is still unmet.
Recommendations for improvements that need to be given are conducting
briefings and training for welders so that they are more adept at using the welding
machine, cleaning (blasting) the workpiece to remove residual welding impurities,
and providing a memo regarding the results of the welding to be given to the next
welder.