Effects of Shot Blasting on Corrosion Properties after Electrodeposition and Fatigue Properties of Arc Welds in Automotive Steel Sheets

Abstract

In this study, we investigated the effect of shot blasting on the corrosion properties after electrodeposition and the fatigue properties of the arc welds in automotive steel sheets. The corrosion properties of arc welds after electrodeposition were signi cantly improved by shot blasting due to the removal of slag and fume, which can cause painting defects. Also, the fatigue strength of welded joints was enhanced by shot blasting, because the mean stress effect due to compressive residual stress improved the fatigue properties. These results suggest that shot blasting has the potential to reduce the thickness of arc welded steel parts in automobile chassis.

Fatigue strength improvement method for thin sheet GMA welding joints by weaving

“…Fatigue strength is significant for GMA-welded parts of chassis members. Ultrasonic impact treatment (UIT) [1] and shot blast treatment [2] are effective in improving fatigue strength. However, it is difficult to apply because of the increase in processes and the cost of introducing equipment.…”