Penggunaan baja karbon untuk memenuhi kebutuhan manusia semakin meningkat tiap tahunnya. Baja bukan termasuk material yang tahan karat, sehingga dapat mengalami korosi seiring berjalannya waktu, terlebih Indonesia merupakan negara tropis yang memiliki curah hujan dan kelembaban yang tinggi. Hampir semua sektor industri mempunyai permasalahan dengan korosi. Permasalahan yang timbul dapat berupa kerusakan, umur pakai barang yang tidak memenuhi harapan sampai pada faktor keamanan yang tidak memadai. Penelitian ini bertujuan mempelajari pengaruh komposisi pelapisan baja karbon rendah menggunakan material komposit PAni-TiO2.  Pelapisan komposit PAni-TiO2 pada baja karbon rendah dilakukan dengan metode elektrodeposisi pada medium asam dan garam LiCl.  TiO2 disintesis dengan metode solgel, sedangkan PAni disintesis dengan polimerisasi elektrokimia bersamaan dengan elektrodeposisi. Berdasarkan hasil penelitian laju korosi tertinggi dihasilkan Plat tanpa inhibitor dengan nilai 0,007359 mpy, sedangkan laju korosi terrendah dihasilkan oleh Plat 2 dengan nilai 0,003666 mpy.  Komposisi terbaik untuk melindungi Plat dari korosi adalah 10-3 M PAni dan  10-2 M TiO2.

The process of tempe production in small industry are considering not optimal yet. The process does not consider the ergonomic aspects and is not environment friendly. It causing complaint at some body parts and pollution. For the solution, this research aims to design a multifunctional tool that considering ergonomic and eco-friendly aspect. The design will be based on Ergonomic and the Quality Function Deployment (QFD) methods. Based on evaluation using the Nordic Body Map, it shows that body parts with the most complaints are the waist, back, neck, right and left shoulder, wrist and leg. Complaints on these body parts are caused by wrong postural when doing work which is not ergonomic. And by using Quality Function Deployment (QFD) the tool designed by considering user expectation and desire. it was found that the user expect for the tool to be made based on worker anthropometry, moved with a semi-manual machine and the tool model is suitable for work. Overall the design shows that the Ergonomic Tempe Maker Tool is a multifunctional tool that easy, flexible, safe and comfortable to be operated which focused on anthropometric size, uses a semi-manual machine and can be arranged up or down.

In the industrial world, carbon steel has been widely used. Corrosion of carbon steel cannot be avoided, so many studies have been carried out to overcome Corrosion. One of the efforts to overcome Corrosion is by coating. Low-carbon steel coating was done by combining TiO2 and polyaniline (PAni), which was carried out by electrodeposition. A carbon steel specimen that has been coated is corroded by immersing it in an acid and salt medium. After Corrosion, the specimen is tested for hardness. The specimen without inhibitor has a hardness value of 131 kg/mm2, while the specimen with the highest hardness value is a specimen coated with PAni 10-1 M and TiO2 10-4 M at 336 kg/mm2. Based on visual observation, the Corrosion that occurs is uniform.

Austenitic stainless steel or commonly known as AISI 304 stainless steel has advantages, including good ductility at relatively low temperatures and high resistance to corrosion. These properties make Austenitic Stainless Steel a candidate material for use in pipe fabrication systems, automotive exhaust gas systems and some equipment related to the chemical and nuclear industry. Therefore, it is necessary to analyze the variation of welding currents on the strength of the welds in the application of Shielded Metal Arc Welding (SMAW) on stainless steel. The electrodes used are E308-16 types with current variations of 90 amperes, 100 amperes and 110 amperes. The results showed that the electric current factor in the SMAW welding process greatly influenced the welding results in terms of its strength. The highest mechanical strength was obtained at welding current of 110 Ampere, with a heat input of 976.067 J / mm, an average mechanical strength of 68.438 kg / mm2 for tensile stress and strain of 47.451% in the tensile test, and an average value of hardness of 225.008 HV for hardness test in weld.

The growth of the automotive industry has made the market demand for motor vehicle spare parts soar, especially motorcycles, including the demand for cylinder blocks. Procedure of this research was carried out to analyze the product of 4 stroke motor cylinder block castings, which include; manufacture of casting product designs, manufacture of gating systems and riser systems. Results and Discussion based on the results of the shrinkage simulation test that has been carried out through the type of sand casting casting with the casting material, namely FCD-600-3 cast iron (1290oC) and the impression material used is silica sand (20oC) with a gravity casting type of casting, it can be concluded  that the results of design testing 1 (one) obtained a filling velocity of 1.111 m/s, with a filling time of 3.8 seconds and a required solidification time of 6 minutes.  In design 1 (one) there is a shrinkage defect due to shrinkage located on the sprue and riser of 0.336%.  While the test results from design 2 (two) obtained a filling velocity of 1.09 m/s, with a filling time of 3.9 seconds and a required solidification time of 5 minutes.  In design 2 (two) there is a shrinkage defect due to shrinkage located on the riser and in the cast product of 0.404%.  The conclusion of the test results on both designs, it was found that design 1 (one) is the most optimal design for cylinder block casting planning.