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Kosjoko Kosjoko
Jurusan Teknik Mesin Fakultas Teknik Universitas Brawijaya
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Journal : Journal of Engineering Science and Technology

 1 
Pengaruh Variasi Bentuk Kampuh Las TIG (Tungsten Inert Gas) Terhadap Uji Tarik dan Struktur Mikro Pada Material Plat Stainless Steel 201 Pratama, Mokhammad Yoga; Mufarida, Nely Ana; Kosjoko, Kosjoko
Journal of Engineering Science and Technology Vol. 1 No. 3 (2023): September
Publisher : Indonesian Journal Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47134/jesty.v1i3.19

Abstract

Welding technology has an integral role in the manufacturing technology domain. To create high-quality structures requires technology that allows joining metals. It is in this phase that welding technology comes into play. TIG (Tungsten Inert Gas) welding is a form of tungsten gas arc welding, where the electrode acts as an arc supplier that does not melt during the welding process. The Gas Tungsten Acr Welding technique is generally used more on light metals such as magnesium, aluminum, and stainless steel, and other types of metal. This type 201 carbon steel has several mechanical characteristics, including a tensile strength of 580 Mpa, an elastic limit (yield strength) of 198 Mpa, an elongation rate of 50%, and a hardness of 87 HRBI. The aim of this research is to determine the tensile strength and microstructure of TIG (Tungsten Inert Gas) welding results with 45 degrees of V, U and J seams. This research was carried out with several flat 2D test models of 45 degrees of V, U and J seams with current. 110 - 120. This research was conducted at the Banyuwangi Job Training Center, in the Materials Laboratory for Mechanical Engineering at Sebelas Maret University, Surakarta and at the Mechanical Engineering Laboratory at Jember State University. In this research, the results of changes in tensile strength were quite significant. The lowest tensile strength value is found in the J weld seam with an average value of 394.4 MPA. Meanwhile, the highest tensile strength value is found in the V weld seam with an average value of 531.1 MPA. The results of the microstructure for J seam have the largest phase grains and V seam forms the smallest phase grains compared to the others. Kampuh V has quite a large number of grains because they are relatively small and dense.
Pengaruh Variasi Arus Las SMAW Terhadap Uji Tarik dan Uji Kekerasan Serta Struktur Mikro Pada Bahan ST 37 Surahman, Andika; Mufarida, Nely Ana; Kosjoko, Kosjoko
Journal of Engineering Science and Technology Vol. 1 No. 3 (2023): September
Publisher : Indonesian Journal Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47134/jesty.v1i3.21

Abstract

This research aims to determine the effect of variations in welding currents of 90A, 100A, and 110A on SMAW bases on the material in the tensile, hardness, and microstructure tests. This research uses ST37 low carbon steel and uses E6013 electrodes with a diameter of 3.2 mm, followed by making specimens for testing. After that, the welding process is carried out and then testing continues. In the test, the following results were obtained: The strength value of the welded material with tensile testing was obtained with the highest results at a current variation of 110A with Yp 27.33 Mpa, Max 36.47 Mpa, Break 31.08 Mpa. Because the highest pearlite microstructure value is obtained in the 110A variation. And the lowest value occurred in the welded material of variation 90A with Yp 25.48 Mpa, Max 26.86 Mpa, Break 12.33 Mpa. Because the lowest pearlite microstructure value is obtained in the 90A variation. while the comparison of the level of hardness in ST 37 carbon steel with varying welding currents ranging from 90A, 100A, and 110A has an average hardness value of 168 VHN for welding with a current of 90A for welding with a current of 100A the average hardness value is 177 VHN and finally in welding current 110A the average hardness value is 191 VHN. The hardness level of the ST 37 carbon steel specimen was the highest at a welding current of 110A, with a tensile strength test result of 36.47 MPa. And from the results of observing photos of the microstructure using the point count method, the highest percentage of pearlite was in the welding material variation 110A so the tensile strength value was higher.
Pengaruh Variasi Arus Pada Pengelasan SMAW Terhadap Uji Kekuatan Bending dan Struktur Micro Baja ST 42 Mabrullah, Riki Alan; Kosjoko, Kosjoko; Shofiyah, Rohimatush
Journal of Engineering Science and Technology Vol. 2 No. 2 (2024): May
Publisher : Indonesian Journal Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47134/jesty.v2i2.24

Abstract

This research aims to analyze the effect of variations in welding current on the mechanical strength of ST 42 steel using the SMAW welding method and E6013 electrodes with a diameter of 3.2 mm. The variations in welding current used are 90A, 100A and 110A. The tensile test results show that a welding current of 110A produces the highest tensile test value with a yield point (YP) of 8,368 MPa, maximum stress (MAX) of 9,890 MPa, and break point (BREAK) of 5,283 MPa. Bending tests indicate that a welding current of 110A produces the highest bending strength of 10.118 MPa. Microstructural observations revealed that the highest percentage of pearlite was present in welding with a current of 110A, which contributed to an increase in the tensile strength of the material. From the results of this research, it can be concluded that the increase in welding current is directly proportional to the increase in the mechanical strength of ST 42 steel
Co-Authors Abadi Sanosra Abdul Rohman Agus Surya S, M Amelia novinda sari Amri Gunasti Ana Mufarida, Nely Andre, Irham Andrean Asroful Abidin Bagus Dwi Kurniawan, Bagus Dwi Din’go Ega Prayitno, Rachmad Djoko Sutikno Fajar Santosa, Muhammad Felani, Fran Nur Fidhausi Alviyndin , Arta Abtian Finali, Asmar Gilang, Aditya Gunawan, Arik Hairul Bahri, Mokh. Hawaij, Dedi Maulana Hifni, Mada Naufal Irawan, Moh Iskandar Umarie Mabrullah, Riki Alan Mufarida, Nely Ana Muhammad Zainur Ridlo Muliyaddi, Muliyaddi Nely Ana , Mufarida Nurhalim Nurhalim, Nurhalim Nurlina, Ika Tyas Octa, Hakim Pratama, Mokhammad Yoga Prawitasari, Saptya Purnawan, Gilang Putra, Dhian Wahana Rachman, Rafly Aulia Ridho, Atok Ainur Romadhon, Muhammad Firly Shofiyah, Rohimatush Sonief, Achmad As'ad Surahman, Andika Syah, Moch. Thoriqur Rahman Toha, Kamil Totok Dwi Kuryanto Ulumudin, M Ikhya Wibowo, Bintang Yudhistira Adi