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All Journal Jurnal Teknoin Rotasi AJIE (Asian Journal of Innovation and Entrepreneurship) Turbo : Jurnal Program Studi Teknik Mesin
Yustiasih Purwaningrum
Jurusan Teknik Mesin Fakultas Teknologi Industri, Universitas Islam Indonesia
Economics, Econometrics & Finance Engineering Mechanical Engineering

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PENGARUH ARUS LISTRIK TERHADAP KARAKTERISTIK FISIK-MEKANIK SAMBUNGAN LAS TITIK LOGAM DISSIMILAR AL-STEEL Purwaningrum, Yustiasih; Fatchan, M.
ROTASI Vol 15, No 1 (2013): VOLUME 15, NOMOR 1, JANUARI 2013
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1280.84 KB) | DOI: 10.14710/rotasi.15.1.16-22

Abstract

The resistance spot weld of dissimilar materials is generally more complex than that of similar materials due differences in the mechanical, physical and chemical properties of the base metals. This research aimed is to investigate the mechanical and physical properties of spot weld of dissimilar materials with various welding current. A Series of bead plate welds were made on 4 mm thick Al 5083 and 1,2 thick SS 400. The welding current that used were 65, 70 and 75 Amperes. The physical properties were examined based on the microstructure using Optical Microscope. The mechanical properties were measured with respect to the strength and hardness using Universal Testing Machine and Vickers Microhardness respectively. The microstructures of all resistance spot welded for carbon steel SS 400 with various welding current were bainit for weld metal and ferrite and pearlite for base metal and HAZ. Weld metal with current welding 75 A have the highest tensile-shear strength.
KARAKTERISASI SIFAT FISIS DAN MEKANIS SAMBUNGAN LAS SMAW BAJA A-287 SEBELUM DAN SESUDAH PWHT Yustiasih Purwaningrum
Teknoin Vol. 11 No. 3 (2006)
Publisher : Faculty of Industrial Technology Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/.v11i3.91

Abstract

The aimed of this research are to compare physical dan mechanical properties between raw materials  and  Shielded Metal Arc Steel Weld Metals and to find optimum temperature of annealing. A series of Shielded Metal Arc Steel Weld Metals were made on 3 mm of Thick A 287 carbon steels. The electrode used was E 6013, Ø 3.2 mm. Annealing was performed with three different  temperature were 300°C,  600°C, dan 850°C. The results show that the tensile strength of raw material had the same value with weld metals and weld metals with annealing 300°C and 600°C, but weld metals with annealing 850°C had lower tensile strength. The hardness experiments was used Vickers Micro Hardness.The Hardness number of weld metals was higher than HAZ and raw materials. Weld Metals with annealing 300°C had the highest value. The elongation of weld metals and weld metals with annealing 300°C and 600°C had lower number than raw materials, but weld metals with annealing 850°C had almost the same value of elongation with raw materials. The optimum annealing temperature was 850°C because weld metals with annealing 850°C had high elongation and low tensile strength.Keywords SMAW, Annealing, Vickers Micro Hardness, Tensile Strength, Elongation.
PENGEMBANGAN METODE STRESSED SHEETING WELD PADA PENGELASAN PLAT BERPENGUAT DENGAN VARIASI TEMPERATUR PREHEAT Yustiasih Purwaningrum; Triyono Triyono; Kelvin Koharto; Adit Suhartanto
Teknoin Vol. 20 No. 1 (2014)
Publisher : Faculty of Industrial Technology Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/.v20i1.6696

Abstract

This research investigates  stressed sheeting welded (SSW) effects of stiffened thin plate structure with preheat temperature  variations. Stiffened thin plate structure is a structure that  consists of frame and sheet that used on  vehicle structure because of requirement low volume materials. The principle of  SSW is installation of sheeting on the frame is done by pulling the sheeting in hot conditions so the sheeting after joined with the frame has the flat surface. Lap joints of  SS 400 with thickness of  1 mm dan 3 mm were made using Gas Metal Arc Welding. The preheat temperature that used were 50°C, 60°C and 70°C. The mechanical properties were measured with respect to strength and hardness while physical properties were examined based on the distortion, micro and macrostructure. Results show that the distortion of weld metal with preheat temperatures 50°C, 60°C and 70°C are 1.02; 2.06; and 2.22 mm respectively. This values is better than weld metal without  SSW that has distortion 3.02 mm. The tensile  strength of weld metals with SSW method  is 20% higher than the weld metal  without SSW. Ferrite and pearlite structure appeared in based metal and HAZ region while weld metal had acicular ferrite and grain boundary ferrite structure.
PERANCANGAN DAN PEMBUATAN MESIN LAS ELEKTRODA GANDA UNTUK MENINGKATKAN KUALITAS HASIL LAS Yustiasih Purwaningrum; Medilla Kusriyanto; Rudi Kurniawan
Teknoin Vol. 24 No. 1 (2018)
Publisher : Faculty of Industrial Technology Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/teknoin.vol24.iss1.art9

Abstract

Double Metal Arc Welding Gas Electrodes (DE-GMAW) is a new welding process that separates the melting current into a base metal current and a controlled current by adding a TIG torch to a conventional GMAW system to form an alternative path that will flow through the current. This makes it possible to reduce the current passing through the base metal, so that the heat input in the base metal can be controlled at the desired level. Research has been done to know the parameters for the welding process run stable between welding wire and torch TIG as current cutter. Parameters that affect the stability of the control system are Bypass Electrodes, Tungsten Distance to Welding Electrodes, Tungsten Distance to Workpieces, Torch GMAW Tube Distance to Workpieces, Angles between Tungsten and Welding Wires. To control the base metal current at the desired level, a group of power resistors is added in the control system. In this study, the welding is done using 18 V voltage by using several variations of the number of resistors. From the research shows that the control system developed can adjust the current cut in a large range to maintain the base metal current at the desired level. The welding results using the DE-GMAW control system show the physical properties of the weld result better when compared with welding without using current control system.
Analisis Sifat Mekanik dan Tribologi pada Cakram Baru dan Bekas Khafidh, Muhammad; Dhewanto, Santo Ajie; Kasim, Muhammad Alfaarisi Maulana; Purwaningrum, Yustiasih
ROTASI Vol 25, No 4 (2023): VOLUME 25, NOMOR 4, OKTOBER 2023
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.25.4.14-22

Abstract

Proses pengereman pada kendaraan mempunyai dua komponen penting, yaitu piringan cakram dan kampas rem. Kontak antara cakram dan kampas rem diharapkan mempunyai gesekan yang cukup untuk mengurangi kecepatan kendaraan. Selain itu, keausan dari cakram dan kampas rem harus diminimalkan untuk memperpanjang umur komponen. Di Indonesia, banyak pemilik kendaraan yang memutuskan untuk mendaur ulang material cakram ketika cakram sudah aus. Dari sudut pandang lingkungan, hal ini akan mengurangi limbah dan jejak karbon dioksida. Namun, kinerja keselamatan dari cakram daur ulang tersebut belum banyak diteliti. Dalam penelitian ini akan dianalisis kinerja mekanik dan tribologi berbagai jenis bahan cakram, baik cakram baru maupun yang daur ulang. Bahannya ada empat, yaitu cakram baru (Ba), cakram bekas (Be), cakram bekas + sekrap (BeS), dan cakram bekas + sekrap + ampplas (BeS Amplas). Analisis yang dilakukan meliputi kekerasan, kekasaran, massa aus, koefisien gesek, dan temperatur. Hasil penelitian menunjukkan bahwa kekasaran permukaan material Be lebih rendah dibandingkan material Ba, sedangkan material BeS memiliki kekasaran kurang lebih 5 kali lebih tinggi dibandingkan material Ba. Kekasaran permukaan material BeS yang tinggi menghasilkan gesekan yang rendah dan keausan yang tinggi. Situasi ini tidak diinginkan untuk aplikasi rem karena mengurangi keselamatan dan masa pakai produk. Pemberian perlakuan amplas pada material BeS dapat meningkatkan kinerja tribologi dan menurunkan suhu kontak.
Pengaruh Degree of Availability (DOA) Urea (CO(NH2)2) Sebagai Sumber Nitrogen pada Proses Pack Nitriding terhadap Sifat Fisik dan Mekanik Sprocket Non Pabrikan Resmi Purwaningrum, Yustiasih; Yudhawan, M. Riza; Rahman, A.
TURBO [Tulisan Riset Berbasis Online] Vol 14, No 1 (2025): TURBO : Jurnal Program Studi Teknik Mesin
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v13i2.3807

Abstract

The aimed of this experimen is to determine the effect of degree of availability (DOA) variation of urea as a source of nitrogen in the pack nitriding process on the physical and mechanical properties of sprockets that manufactured from non-official motorcycle manufacturer.  The DOA variation used is 0.1 gr/mm2; 0.15 gr/mm2; and 0.2 gr/mm2. The pack nitriding process is carried out using a temperature of 550°C, a holding time of 2.5 hours and a cooling process with water medium. The testing process carried out is chemical composition, wear, hardness, observation of microstructure and corrosion rate. The results of the chemical composition test showed that the nitrogen content of all DOA variations of the nitriding pack increased compared to before the pack nitriding process. The amount of nitrogen from pack nitriding with DOA variation were 0.1336 %  for 0.1 gr/mm2;  0.1938 % to 0.15 gr/mm2; and 0.1996 % for 0.2 gr/mm2. While non-official manufacturer sprockets have a nitrogen content of 0.0004%. The wear value of the nitriding pack is smaller than before the nitriding pack. The lowest wear value was found in the nitriding pack result with a DOA of 0.2 gr/mm2, which was 0.00011 mm3/kg.m. This value shows that the nitriding pack has more wear resistance compared to the initial material which has a value of 0.00059 mm3/kg.m. The pack nitriding process can also increase the hardness value. The hardness value of the sprocket before the nitriding process is 266.67 VHN. The results of pack nitriding showed that the highest hardness value was found in the DOA variation of 0.2 gr/mm2 with a value of 356.18 VHN, followed by DOA 0.15 gr/mm2 with a value of 315.11 VHN and the lowest value was found in DOA 0.1 gr/mm2 with a value of 267.67 VHN. The results of corrosion testing show that all specimens before and after the nitriding process can be categorized as having excellent corrosion resistance.
Optimasi Sifat Fisik dan Mekanik Sambungan Las TIG (Tungsten Inert Gas) pada Baja SS400 dengan Variasi Nilai Arus Listrik: indonesia Purwaningrum, Yustiasih; Alvianto, Isal; Sidiq, Reza Arief
Asian Journal of Innovation and Entrepreneurship Volume 09, Issue 02, May 2025
Publisher : UII

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/ajie.vol9.iss2.art6

Abstract

The study focused on optimizing the physical and mechanical properties of TIG (Tungsten Inert Gas) welded joints on SS400 steel, which is essential to fulfill quality standards in the industry. The aim of this study is to analyze the influence of welding current with variations in values of 85 Amperes, 90 Amperes and 95 Amperes on the physical and mechanical properties of welded joints.The material used was SS400 steel with a thickness of 3 mm. The welding parameters used are AWS A5 12-80 tungsten electrode with a diameter of 2.4 mm, filler ER70S-6 with a diameter of 1.6 mm, argon shielding gas, flow rate 6 liters/minute, voltage 230 V, and welding speed 1.46 mm/s. From the results of the tests carried out, the welding steel that used a current of 95 Ampere has the best performance. The results of the tensile test showed that the tensile strength of this specimen was 390.3 MPa. This value is higher when compared to other current variations which have a value of 224.1 MPa for 85 Ampere and 235.2 MPa for 90 Ampere. In the toughness test, the specimen with a current of 95 Ampere showed the best impact value that reached 1.27 J/mm. Microstructure observation of the specimen showed a phase change where in the HAZ and raw metal regions there were a pearlite and ferrite, then due to the high heat in the welding area and the addition of fillers, the ferrite changed its phase to grain boundary ferrite, Acicular ferrite and Widmanstatten ferrite
Co-Authors A. Rahman Adit Suhartanto Alvianto, Isal Dhewanto, Santo Ajie Kasim, Muhammad Alfaarisi Maulana Kelvin Koharto M. Fatchan Medilla Kusriyanto, Medilla Muhammad Khafidh Rudi Kurniawan Sidiq, Reza Arief Triyono Triyono Yudhawan, M. Riza