No abstract

The purpose of this research is to improve productivity in Lotus High Tech Company (LHTC). This research used time and motion study techniques to improve the production process at LHTC. The research objectives towards accomplishing this study is to identify problems in the current method and improve it in terms of production time, number of process and production layout by proposing a new method to the manufacturing product. The current method in the manufacturing of garment in the production line involved some unnecessary steps, where the materials and components take a very long and roundabout path on their journey to the workstation, which adversely affect productivity. The proposed method eliminates these steps, which reduces production time, number of processes, and the overall increase in productivity is about 72.6%.

The effects of semi-spherical pin on mechanical properties and microstructure of 7 mm thick friction stir welded dissimilar aluminum alloys AA7075 and AA5083 were investigated. Threee different pin profiles were used to weld three joints of dissimilar AA7075 and AA5083 Al alloys. Semi-spherical pin, cylindrical pin, and pin with round groove. The friction stir welding was performed at 700 rpm rotational speed and 25 mm/min welding speed. Defect-free FSW joint was obtained by using a simple tool with semi-spherical pin. Meanwhile, the crack-like defect is formed in the joints produced by the tools with cylindrical pin, and pin with round groove. The usage of FSW tool with semi-spherical pin (large frictional area of pin) produces a friction stir weld joint with higher tensile strength. When the tool with semi-spherical pin is applied, the grains size was smaller than that when using the other tools.