Pengaruh Penambahan Unsur Titanium-Boron (Ti-B) 0,1% dan 0,5% Terhadap Nilai Kekerasan Paduan Alumunium

This study discusses the composition of the material contained in the used piston material and compares the strength value of each variation of Ti-B percentage by violence testing. The method used in metal casting is Gravity Casting which uses only gravity of the earth. In the manufacture of this recycled piston includes several stages of the process of working method with Sand Casting mold and its test. Among them are pattern planning, raw material preparation, pattern making, pasri printing, mold making with CO2 gas, aluminium metal smelting, Ti-B input into melt kitchen, casting of liquid metal, casting specimen and final process. The result of composition testing of main alloy material is 84,19 % Al and 10,8306 % Si. The result of hardness testing with gravity casting method on the percentage of Ti-B 0,1% and 0,5% using sand casting mold have hardness number 52,62 VHN and 71,76 VHN. The percentage of addition of Ti-B element greatly affect the mechanical properties of the material, so that more Ti-B element, then the material will have hard mechanical propertie

Vertical Blade Fiberglass Composite for Wind Turbine Power Plant Application

Wind is a renewable energy that is used for electrical energy in several countries. Indonesia is one of the countries that utilizes wind energy for electrical energy. The potential for wind in Indonesia is located in coastal areas. To apply the potential for wind in urban areas is very difficult because the wind speed is very low. From this problem, this paper presents a windmill using fiberglass. Fiberglass is an alloy or mixture as a composite material which has the characteristics of light weight, easy shape, and low cost. The aim is to analyze the mechanical properties of fiberglass composite materials in the application of blades or vanes in savionus windmills. This study uses the hand lay-up method and the mechanical testing method for tensile strength and impact which aims to determine the material properties of the blade of the savonius windmill. Based on the tensile test, the average tensile strength of random fiberglass composite and 200gr 2-layer woven roving was 49.52 MPa with an average modulus of elasticity of 21.88 Gpa. For the Charphy impact test, the average impact strength is 0.035 joules / mm2 with the energy absorbed is 0.7046 joules

Analisis pengaruh variasi elektroda las e6013 dan e7018 terhadap kekuatan tarik dan kekerasan pada bahan baja ss 400

Development of technology in the field of construction is increasingly advanced today, will not be separated from technology or welding techniques because it has a very important role in engineering and metal repairs.This study aims to determine the effect of electrode to tensile strength and hardness of SMAW welding on SS 400 steel. The material is given welding treatment with electrode variation E6013 and E7018 diameter of 3.2 mm by using SMAW DC reverse polarity ie the electrode holder is connected to positive pole and the parent metal is connected With a negative pole. The type of camp used is V. The highest tensile strength occurred in the specimens of raw materials that amounted to 432.49 MPa which increased by 10.41 MPa from group E7018. The highest yield strength occurred in the raw materials specimens of 308.53 MPa which had an increase of 9.31 MPa from the E7018 electrode variation group. The highest hardness level occurs in the weld metal part of E7018 electrode variation group that is equal to 189.6 kg /mm2

PELATIHAN PEMBUATAN FILLER METAL ALUMINIUM UNTUK PENGELASAN ASETILIN PADA KELOMPOK BENGKEL LAS

Pengabdian masyarakat ini dilakukan pada kelompok usaha “Anugerah Las” yang bertujuan untuk pengembangan unit usaha bengkel las yang terletak di Desa Palur, Mojolaban, Sukoharjo. Permasalahan yang saat ini dihadapi oleh kelompok usaha jasa pengelasan aluminium yaitu dalam suatu proses pengelasan menggunakan las asetilin membutuhkan bahan tambah pengelasan (filler metal). Bahan yang sering digunakan untuk membuat filler metal yaitu dari sepatu rem bekas, blok mesin atau piston bekas, sehingga filler metal yang digunakan tidak bisa sama kualitasnya karena bahan yang digunakan tidak selalu sama. Masalah yang muncul ini sebenarnya terdapat solusinya tetapi belum dapat teratasi karena minimnya pengetahuan juru las. Solusi yang diberikan yaitu memberikan pelatihan teknik pembuatan filler metal yang berkualitas dan sudah teruji melalui penelitian yang telah dilakukan. Berdasarkan hasil penelitian yang sudah dilakukan, bahan filler metal yang berkualitas untuk dijadikan sebagai bahan tambah las yaitu menggunakan limbah piston bus. Limbah piston bus memiliki komposisi kimia yang lebih baik dibandingkan bahan limbah aluminium yang lainnya, serta limbah piston bus tersedia melimpah di pasaran. Pelatihan pengelasan las asetilin memberikan dampak yang signifikan dengan adanya peningkatan kualitas hasil las yang dihasilkan. Hasil akhir dari program pengabdian ini dapat meningkatkan penghasilan bagi pengusaha las dan usaha menjadi lebih kompetitif dalam bersaing dengan jenis usaha serupa yang lainnya