In the Pareto Analysis for scrap reasons in Fig. 9, projection welding errors stroke/scratch and transfer compression are the first three reasons. The first two scrap reason forms 51% of the total. Stroke/scratch as the scrap reason is discussed because it is a project conducted for scraps of the projection welding errors. Scraps are analyzed in Fig. 10 according to the formation process.
Stroke and scratches occurred in the bodies of 45cm are classified in Fig. 10 depending on the steps they have occurred after three weeks data collection process. 76.3% of the scrap occurs in Akana workplace, as seen from Fig. 10. Irregularities in the production flow of the bodies of 45cm increases the formation of scratches. 68.2% of this case results from the inventory building process.
As an example, according to a critical point, the process sigma level is calculated;