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Pengaruh Variasi Karbon Aktif dan Waktu Tahan Terhadap Kekerasan Material JIS G-3123 Menggunakan Metode Pack Carburizing Rahma Rei Sakura; Suheni Suheni; Dani Darojat Iskandar
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 2 No 1 (2017): June
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v2i1.805

Improvement of mechanical feature in metals are necessary for industrial development. In industries, it requires the mechanical features, such as frictional strength and good wear resistance. Carburizing is a heat treatment process that produces toughness surface in the presence of carbon-bearing material. The carburizing process of JIS G-3123 steel was performed by Pack Carburizing method with divergent variation of activated carbon weigh(s) 125 grams, 250 grams, and 400 grams and selected holding time in range of 30 minutes, 45 minutes, and 60 minutes. In the result, it was obtained 463.550 kg / mm2 for the highest value of toughness with the weight of 400 gr activated carbon and holding time of 30 minutes. Therefore, it indicated that the higher weight of activated carbon in the carburizing process, the material hardness value will be higher as well, with the lowest holding time.

Analysis of Current, Filler Metal, and Groove on Tensile Strength and Hardness of Dissimilar Welding Using Gas Tungsten Arc Welding (GTAW) Eriek Wahyu Restu Widodo; Vuri Ayu Setyowati; Suheni Suheni; Amang Kuswanto; M. Wiji Santoso
Jurnal Teknik Mesin (JTM) Vol 8, No 2 (2018)
Publisher : LP2M - Institut Teknologi Padang

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Dissimilar welding commonly used on many industries, for example power plan field. This paper presents the investigations carried out to study the influence of current, filler metal, and groove on 304 Stainless Steel to AISI 1040 Carbon Steel dissimilar joints. Gas Tungsten Arch Welding (GTAW) was conducted to join the both of base metals. 100 and 120 Ampere of current were conducted on this research, V and double-V groove with 70o of the angle as well. The maximum hardness was obtained 623.2 HVN of ER 70S-6 filler metal with 120 A of current and V groove. While the maximum tensile strength was obtained from the joint using ER 308L with 100 A of current and V-groove of 673.74 MPa. The HAZ region was obtained from the joint using double-V groove was wider than HAZ region of joint using V-groove according the macrostructure image of the joints.

VARIASI ARUS DAN SUDUT PENGELASAN PADA MATERIAL AUSTENITIC STAINLESS STEEL 304 TERHADAP KEKUATAN TARIK DAN STRUKTURMAKRO Vuri Ayu Setyowati; Suheni Suheni
Jurnal IPTEK Vol 20, No 2 (2016)
Publisher : LPPM Institut Teknologi Adhi Tama Surabaya (ITATS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.iptek.2016.v20i2.40

ABSTRACTÂ Â Â Â Â Â Â Â Â Â Â Welding is the common method for joining material used in construction and industrial applications. Variable of welding process is the most important factor affected into the mechanical properties of welded materials.Â This study used Shielded Metal Arc Welding (SMAW) as welding method. SMAW method use flux to protect the metals. Sample preparations were done to make the V groove using 45áµ’ and 60áµ’ as angle of welding. Variations of heat input also were used as 75A, 85A, and 95A. Characterization of mechanical properties was analyzed by tensile test and macroscopic analysis showed the different area after welding. Based on the following experimental result, the highest ultimate tensile strength was obtained by sampleÂ prepared 45áµ’ of V groove angle and 85A of current which is 518 N/mmÂ² and got 449 N/mmÂ² ofÂ yield strength. Increasing current caused the wider weld pool in the sample surface and showed clear grove shape of welded sample.Â ABSTRAKPengelasan merupakan metode penyambungan material yang secara umum digunakan dalamÂ bidang konstruksi maupun aplikasi di industri. Parameter pengelasan perlu diketahui karena berpengaruh terhadap sifat mekanik yang dihasilkan material setelah proses penyambungan Pada penelitian ini, proses pengelasan yang digunakan adalah Shielded Metal Arc Welding (SMAW). Pengelasan SMAW menggunakan fluks sebagai pelindung logam. Preparasi sampel dilakukan dengan pembuatan sudut pengelasan/sudut kampuh 45áµ’ dan 60áµ’. Â Arus pengelasan bervariasi sebesar 75A, 85A, dan 95A. Karakterisasi sifat mekanik diperoleh dari pengujian tarik dan pengamatan makro untuk mengetahui perubahan daerah yang berbeda setelah dilakukan pengelasan. Berdasarkan hasil pengujian, spesimen benda uji dengan sudut pengelasan 45áµ’ besar beban maksimal (Ïƒu) terjadi pada arus 85 A yaitu sebesar 518 N/mmÂ² dan memiliki tegangan luluh paling tinggi yaituÂ 449 N/mmÂ². Kenaikan arus pengelasan menyebabkan weld pool yang lebih besar dan permukaan penampang samping terlihat jelas bentuk kampuh sampel pengelasan.

Simulasi numerik kombinasi perpindahan panas konveksi alami dan radiasi pada square cavity Syamsuri Syamsuri; Suheni Suheni; HS Maulana; Muhammad Syafii
TURBO [Tulisan Riset Berbasis Online] Vol 8, No 2 (2019): Jurnal Turbo Desember 2019
Publisher : Universitas Muhammadiyah Metro

Natural convection is very important in some cases such as glass windows, solar collectors, electronic measuring devices (cooling devices for electronic instruments) and building materials that use insulation. In this research, will be seen the phenomenon of natural convection that occurs in square cavity. The method used for simulation is computational fluid dynamics or CFD. The model used is the 2D cavity model. In this simulation the value of Rayleigh Number (Ra) was varied i.e. 103,104,105 and 106. From this research, it is found that the higher the value of Ra in cavity, the higher the value of the average Nusselt Number (????̅???? ) on the wall which has a high temperature. Ra = 103 so that ????̅???? = 1.17. Ra =104, so that ????̅???? = 2.2. Ra = 105, so that ????̅???? = 4.47. Ra = 106, and then so that ????̅???? = 8.95. Based on the value and contour of the flow the smaller the Ra value in the square cavity, the isothermal line phenomenon that appears will be more vertical. The greater the Ra value in the cavity, the contour of the stream function will change to an ellipse and finally two vortices will appear.Keywords: Numerical simulation, konveksi, radiasi, square cavity.

VARIASI JENIS KAMPUH LAS DAN KUAT ARUS PADA PENGELASAN LOGAM TIDAK SEJENIS MATERIAL STAINLESS STEEL 304L DAN BAJA AISI 1040 DENGAN GAS TUNGSTEN ARC WELDING Eriek Wahyu Restu Widodo; Vuri Ayu Setyowati; Suheni Suheni; Ilham Qiromi
Prosiding Seminar Nasional Sains dan Teknologi Terapan Pendekatan Multidisiplin Menuju Teknologi dan Industri yang Berkelanjutan
Publisher : Institut Teknologi Adhi Tama Surabaya

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Sambungan logam atau pengelasan yang tidak sejenis atau dissimilar welding merupakan salah satu kebutuhan yang penting bagi industri. Sambungan hasil pengelasan ini digunakan pada beberapa aplikasi yang memerlukan sifat sambungan khusus yang baik untuk menghemat biaya material. Penelitian ini dilakukan untuk mendapatkan sambungan yang mempunyai kekuatan yang baik dengan variasi jenis kampuh las dan kuat arus yang digunakan. Pengelasan logam yang tak sejenis, Stainless Steel 304L dengan Baja Karbon AISI 1040, dilakukan dengan Gas Tungsten Arc Welding (GTAW) dengan posisi datar 1G dan elektroda ER 308L, sambungan diuji dengan pengujian tarik dan diamati dengan foto strukturmakro. Pengujian tarik sambungan logam tak sejenis diperoleh kekuatan tarik paling tinggi 468 MPa pada sambungan dengan kampuh V sudut 30o dan kuat arus 120 A, sedangkan paling rendah adalah sambungan dengan kampuh V sudut 45o dengan kuat arus 120 A dengan kekuatan tarik 385.84 MPa. Berdasarkan pengujian tarik tersebut dapat disimpulkan bahwa semakin sempit sudut kampuh yang digunakan dan semakin tinggi kuat arus yang diberikan akan semakin meningkatkan kekuatan tariknya karena distribusi panas yang merata dan kecepatan pendinginan yang seragam. Kata kunci: baja karbon, pengelasan tidak sejenis, stainless steel

THE EFFECT OF WELDING CURRENT ON AISI 1045 STRENGTH AND CORROSION RATE Iftika Philo Wardani; Vuri Ayu Setyowati; Suheni Suheni; Ilham Prajala Samudra
Journal of Applied Sciences, Management and Engineering Technology Vol 1, No 2 (2020)
Publisher : Institut Teknologi Adhi Tama Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jasmet.2020.v1i2.1159

Shielded Metal Arc Welding (SMAW) was widely used in industry for joining AISI 1045 steel because this method was simple, in-expensive, and the device is portable. This researched aimed to analyze the effect of variations in welding current towards material strength and corrosion rate of AISI 1045. Welding current that been used as variations in this study are 100, 110, and 120 Ampere. This research was conducted using tensile test on the weld area and immersion around the weld area in NaCl solution with 0.4% concentration. From the research that conducted, it is known that increasing in welding current made the yield strength, tensile strength, and fracture strength of material also increased. This phenomenon also happened for elongation of material in weld area. With increasing the welding current then the elongation of material also increasing. Another aspect that researched in this paper is the effect of welding current toward corrosion rate of material. From the result, it was known that increasing welding current made corrosion rate of material became faster.

The Mechanical Properties and Microstructure Analysis of Carbon Structural Steel After Quenching in Circulated Water Medium Afira Ainur Rosidah; Vuri Ayu Setyowati; Suheni Suheni; Muhamad Febrianto
Jurnal IPTEK Vol 26, No 1 (2022)
Publisher : LPPM Institut Teknologi Adhi Tama Surabaya (ITATS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.iptek.2022.v26i1.1139

The use of carbon structural steel in construction is widely developed. It is important to do research continuously in order to get the optimum mechanical and physical properties of a material. Heat treatment which includes heating and quenching is a process that can be carried out to improve mechanical properties. A fast cooling rate is used to obtain higher strength and hardness. This research studied the effect of quenching using circulated water medium with water flow rate variations in structural steel Q235, Q255, and Q275 to their mechanical properties and microstructure. The heat treatment process was done with hardening at 1150oC, roll milling at austenitizing temperature, then quenching using circulated water medium with water flow rate of 225, 238, 247 m3/h. The tensile and hardness test results showed that water flow rate and carbon content in steel give an effect on strength and hardness. The highest tensile strength and hardness value were achieved by Q275 steel with a flow rate of 247 m3/h, which are 73,49 kgf/mm2 and 298 HVN, respectively. Meanwhile, the microstructures resulted in the presence of the mixture of martensite and pearlite, as well as ferrite in every sample with the increase in the composition of martensite and pearlite in Q275 steel with a flow rate of 247 m3/h.

Analysis of Current, Filler Metal, and Groove on Tensile Strength and Hardness of Dissimilar Welding Using Gas Tungsten Arc Welding (GTAW) Eriek Wahyu Restu Widodo; Vuri Ayu Setyowati; Suheni Suheni
Jurnal Teknik Mesin Vol 8 No 2 (2018): Jurnal Teknik Mesin Vol.8 No.2 October 2018
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21063/jtm.2018.v8.i2.56-60

Dissimilar welding commonly used on many industries, for example power plan field. This paper presents the investigations carried out to study the influence of current, filler metal, and groove on 304 Stainless Steel to AISI 1040 Carbon Steel dissimilar joints. Gas Tungsten Arch Welding (GTAW) was conducted to join the both of base metals. 100 and 120 Ampere of current were conducted on this research, V and double-V groove with 70o of the angle as well. The maximum hardness was obtained 623.2 HVN of ER 70S-6 filler metal with 120 A of current and V groove. While the maximum tensile strength was obtained from the joint using ER 308L with 100 A of current and V-groove of 673.74 MPa. The HAZ region was obtained from the joint using double-V groove was wider than HAZ region of joint using V-groove according the macrostructure image of the joints.

Analisis Pengaruh Variasi Besar Arus dan Kecepatan Pengelasan Terhadap Pengujian Tekuk/Bending dan Struktur Makro pada Material Aluminium 6061 dengan Proses Pengelasan TIG (GTAW) Arnold Kuch Yeremia Jalmaf; Suheni Suheni
Prosiding SENASTITAN: Seminar Nasional Teknologi Industri Berkelanjutan Prosiding SENASTITAN Vol. 03 2023
Publisher : Institut Teknologi Adhi Tama Surabaya

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Pengelasan (welding) adalah suatu cara menyambung benda padat dengan jalan mencairkannya melalui pemanasan. Aluminium seri Al-6061 termasuk dalam material yang memiliki ketahanan korosi, kekuatan serta mampu las yang cukup. Untuk pengelasan aluminium, pengelasan TIG sangat baik digunakan karena gas tungsten akan mengusir oksigen yang akan menimbulkan oksida logam yang hasilnya sangat keras. Pengaturan besarnya kuat arus sebelum proses pengelasan dilakukan tentu saja akan mempengaruhi jumlah masukan panas, penetrasi las dan tegangan busur. Tujuan daripada penelitian ini adalah untuk mengetahui besar arus dan kecepatan pengelasan terhadap struktur makro dan kekuatan bending pada las TIG untuk material Aluminium 6061. Metode penelitian yang digunakan dalam penelitian ini berupa eksperimen. Pada penelitian ini perlakuan yang diberikan oleh peneliti adalah pengelasan dengan variasi kuat arus dan kecepatan pengelasan. Pengelasan dilakukan dengan metode Las TIG (Tungsten Inert Gas) pada material Aluminium 6061 dengan bahan pengisi/filler 4043 dengan kampuh V tunggal 600. Analisis data yang digunakan pada penelitian ini menggunakan analisis deskriptif. Hasil kekuatan bending tertinggi terdapat pada Arus 90 A dengan kecepatan pengelasan 1,5 mm/sec, yang memiliki nilai sebesar 62,50 Kg/mm2, sedangkan kekuatan bending terendah pada arus pengelasan 100 A dengan kecepatan pengelasan 2,5 mm/sec dengan nilai sebesar 40,417 Kg/mm2. Berdasarkan pengamatan foto makro menggunakan Software Image-J, lebar HAZ yang paling rendah terdapat pada spesimen arus 80 A dengan kecepatan pengelasan 1,5 mm/sec dengan nilai sebesar 0,63 mm. sedangkan lebar HAZ yang paling tinggi terdapat pada spesimen arus 100 A dengan kecepatan pengelasan 2,5 mm/sec dengan nilai sebesar 0,85 mm.

Analisis Pengaruh Posisi Pengelasan Dan Besar Arus Terhadap Kekuatan Tarik Dan Struktur Makro Pada Proses Las Gmaw Dengan Material Baja A-36 Ari Dieto Krisanggoro; Suheni Suheni
Prosiding SENASTITAN: Seminar Nasional Teknologi Industri Berkelanjutan Prosiding SENASTITAN Vol. 03 2023
Publisher : Institut Teknologi Adhi Tama Surabaya

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Uji Tarik adalah salah satu pengujian yang digunakan untuk mengetahui sifat mekanik logam maupun non logam. Uji tarik merupakan suatu metode yang digunakan untuk menguji kekuatan suatu bahan/material dengan cara memberikan beban gaya yang berlawanan arah. Pengujian tarik (tensile test) juga sering disebut sebagai tension test, merupakan salah satu dari pengujian mekanik yang paling mendasar/fundamental, sangat sederhana, tidak mahal dan telah distandarisasi di seluruh dunia, pengujian spesimen menggunakan ASME IX 2017 untuk uji tarik setelah dilas menggunakan GMAW. Dapat mengetahui tegangan, regangan. Tujuan dari penelitian ini adalah untuk mengetahui sambungan kekuatan las dilihat dari kekuatan tarik masing-masing specimen. Penelitian ini menggunakan metode eksperimen perbandingan, yaitu suatu cara untuk membandingkan antara tiga indikator speciment yang berbeda besar arus dan posisi pengelasan, untuk mengetahui kekuatan tarik masing-masing speciment Hasil dari pengujian tarik menunjukkan rata-rata semua sambungan mengalami patah getas. Hasil menunjukkan rata-rata nilai kuat tarik sambungan las dengan variabel 80 Ampere di peroleh rata-rata 28757,47 MPa, variabel 90 Ampere di peroleh rata-rata 39759,24 MPa, dan Variabel 100 Ampere di peroleh nilai rata-rata sebesar 53228,58 Mpa.

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