The purpose of this work is to reveal the surface roughness and topography of AISI 316L stainless steel due to electropolishing processes. In this paper, AISI 316L was electropolished in various times of immersion and various voltage of the processes. The mechanism of electropolishing is eroding the surface of the substrate by controlling the electron excitation process. The electropolishing processes were carried out at 4, 5, and 6 minutes also in three different voltage 4, 6, and 8 volts. The results show that the surface roughness decrease as the treatment time and also as an increase in voltage.

In the car, the body structure is designed in such a way so as to transfer and absorb energy.

This study aims to determine the various effect of heat input due to varied electric current on microstructure of the weld joints and the bending strength of 2 dissimilar metals (aluminum alloy 5052 and galvanized steel) with Al-Si 4043 as filler. This experimental research was worked out by varying the strength of the current which can then be calculated into a heat input. The current inputs applied were 30.8 J / mm (70A), 35.2 J / mm (80A) and 39.6 J / mm (90A) while the protective gas flow rate used is 14 liters / minute. This study showed that the increase in heat input greatly affects the shape of the weld area microstructure, i.e. the microstructure and bending strength. Greater heat input due to higher current can melt larger area, so that the join process occured better. The highest bending strength at 9.05 Mpa was achieved for heat input at 39.6 J / mm or strong current of 90 A. The weakest bending strength at 8.88 Mpa was achieved for heat input at 35.2 J / mm or a strong current of 70 A.

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The paper presents the effect of size and repetition process on silica blasting on the surface character of Medical Grade SS316L. In this study, topography and surface roughness of SS316L will be evaluated both using optical and stylus methods. Medical Grade SS316L was blasted using silica sand with a mesh size of 10-30 (then called K), mesh 40-60 (then called S), and mesh 70-90 (then called H). Silica blasting processes was carried out on the surface of Medical Grade SS316L at room temperature, 90° of nozzle direction, and 7 bar of nozzle pressure. The silica blasting process was carried out by varying the treatments of K, S, H, KH, and SH for 10 minutes each. The results show that roughness increases with the size of silica sand, moreover the repetition of the H process on the K and S (KH and SH process) will refine the surface roughness of the results of S and K processes but when compared to H is relatively coarse.