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All Journal Turbo : Jurnal Program Studi Teknik Mesin JTERA (Jurnal Teknologi Rekayasa) JRST (Jurnal Riset Sains dan Teknologi)
Yustiasih Purwaningrum
Universitas Islam Indonesia
Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Optimization of Mechanical Properties of Rotary Friction Welding (RFW) Joints in AISI 1008 Steel with Friction Time Variation Yustiasih Purwaningrum; Rachnaldy Putra; Excel Rifky Fachreza
JRST (Jurnal Riset Sains dan Teknologi) Volume 9 No. 2 September 2025: JRST
Publisher : Universitas Muhammadiyah Purwokerto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30595/jrst.v9i2.24402

Abstract

One method than can be used to joint solid cylinders is Rotary Friction Welding (RFW). RFW is a Type solid-state welding that has the advantage of not requiring filler, shielding gas and produces good mechanical properties because the joining occurs below the base metal temperature. This study aims was to determine the effect of friction time on the physical and mechanical properties of Rotary Friction Welding (RFW) joints in AISI 1008 steel. RFW welding is carried out with a rotation speed of 1,170 RPM and friction plunge of 3 mm and forging depth 2 mm with three kinds of welding time, 3 minutes, 4 minutes and 5 minutes were investigated.  The average temperature of RFW welding with variations of welding time (3-minute, 4-minute and 5-minute) are 1,022.3°C, 1034.5°C and 1,062.7°C. The physical properties of the weld joint were obtained from photomacro using an optical microscope and corrosion testing using the weight loss method. The mechanical properties of the RFW weld joint were determined from tensile and bending tests using a Universal Testing Machine as well as hardness testing using the Vickers Microhardness method. Photomacro observations show that the longer the welding time used in RFW welding, the wider the welded area. The test results show that optimal physical and mechanical properties were obtained on RFW weld joints with a welding time variation of 4 minutes. At the 4-minute variation, the highest tensile and bending strength values were obtained compared to other time variations. As for the hardness testing of the welding zone with a friction  time of 4 minutes, it has the smallest value compared to other variations in welding time (3 minutes and 5 minutes). For the base metal and the HAZ, the hardness values for all variations are relatively the same because the materials used are the same and the welding heat is not high enough to change the microstructure in the area. Corrosion testing conducted for 50 days showed that all RFW welds with welding time variations had excellent corrosion resistance values.
Peningkatan Sifat Fisik dan Mekanik Baja AISI 1030 dengan proses Pack Chromizing dengan variasi waktu penahanan Yustiasih Purwaningrum
JTERA (Jurnal Teknologi Rekayasa) Vol 11 No 1: Vol. 11 No. 1: Juni 2026
Publisher : Politeknik Sukabumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31544/jtera.v11.i1.2026.19-24

Abstract

Tujuan dari penelitian ini untuk mengetahui pengaruh variasi waktu pack chromizing terhadap sifat fisik dan sifat mekanik baja AISI 1030. Proses pack chromizing menggunakan campuran chromium (????????2????3) dan amonium klorida (????????4????????)dengan perbandingan 20 : 1. Proses pack chromizing dilakukan dengan menggunakan  temperatur 1000℃ dan variasi temperatur penahanan 4 , 5 dan 6 jam. Proses pendinginan dilakukan pada media terbuka. Pengujian yang dilakukan adalah pengujian komposisi kimia, pengamatan struktur mikro, pengujian kekerasan, pengujian keausan, dan pengujian korosi.  Pengujian komposisi kimia menunjukan bahwa material yang digunakan tergolong baja karbon sedang. Kandungan chromium meningkat setelah melalui proses chromizing. Kadar chromium tertinggi terdapat pada waktu penahanan 6 jam yaitu 0,49 % diikuti oleh waktu penahanan 5 jam dengan nilai 0,3139 % dan kadar chromium terendah terdapat pada waktu penahanan 4 jam dengan nilai 0,1136 % Pengamatan  struktur mikro menunjukan baja AISI 1030 dan hasil pack chromizing mempunyai struktur mikro berupa terdapat perlit dan ferit. Hasil pengujian kekerasan dengan metode Vickers microhardness menunjukkan semakin semakin lama waktu penahanan dalam proses pack chromizing, nilai kekerasnnya semakin tinggi. Proses pack chromizing menurunkan nilai keausan pada material. Penurunan tertinggi terdapat pada waktu penahanan 6 jam yaitu sebesar 41,82 %. Hasil pengujian korosi menunjukkan baja AISI 1030 mempunyai nilai ketahanan korosi dalam kategori baik dengan nilai 0,11 mmpy, sedangkan hasil pack chromizing untuk semua variasi waktu penahanan masuk kategori sangat baik (0,02 – 0,1) mmpy.
Pengaruh Proses Post Weld Heat Treatment (PWHT) terhadap Sifat Fisik dan Mekanik Sambungan Las Tungsten Inert Gas (TIG) pada Baja SS 400 Yustiasih Purwaningrum; Reza Arief Sidiq; Isal Alvianto
TURBO [Tulisan Riset Berbasis Online] Vol 15 No 1 (2026): TURBO: Jurnal Program Studi Teknik Mesin
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v15i1.5263

Abstract

The aimed of this research is to find the PWHT (post weld heat treatment) temperature that can produce the optimal physical and mechanical properties of TIG (tungsten inert gas) welded joints on SS 400 steel.. The PWHT temperature in previous TIG welding studies on steel used temperatures below 700℃. At this temperature, the steel's microstructure consists of ferrite and pearlite, so the microstructure after PWHT cooling does not change, remaining ferrite and pearlite. The PWHT process used in this study is quenching with water as the cooling medium. The temperature variations used are 900℃, 1000℃, and 1100℃. Within this temperature range, the steel's pearlite phase has transformed into austenite. After cooling, the austenite phase will change depending on the cooling rate, which further increases the potential improvement in its mechanical properties. The material used is SS 400 steel with dimensions of 300 mm x 100 mm and a thickness of 5 mm. The TIG welding process was carried out using a tungsten electrode AWS A5 12-80 ϕ 2.4 mm and filler metal ER 70S-6 ϕ 1.6 mm. The welding parameters used were a voltage of 230 V, current of 95 A, welding speed of 1.46 mm/s, and argon shielding gas. The tests conducted were dye penetrant testing, microstructure observation, tensile testing, bending testing, microvickers hardness testing, and corrosion rate testing. The test results indicate that a PWHT temperature variation of 1000℃ produces the most optimal weld joint. The tensile strength of the weld with a temperature variation of 1000℃ is 246.31 MPa. This value is 25.8% higher compared to the 900℃ variation and 9.9% higher compared to the 1100℃ variation. The bending test results show that the bending strength of the weld with PWHT at 1000℃ is 483.99 MPa. This value is higher compared to the welds with PWHT at 900℃ and 1100℃, which have bending strengths of 307.52 MPa and 280.81 MPa, respectively. The microstructure formed after the PWHT process at all temperature variations is the same, which is martensite with hard and brittle properties, due to the rapid cooling process. The corrosion rate values fall into the good category for all welds with PWHT. This research produced PWHT temperature data that is useful for improving the physical and mechanical properties of TIG welding results on SS 400 steel, which can be applied in the construction field.
Co-Authors Excel Rifky Fachreza Isal Alvianto Rachnaldy Putra Reza Arief Sidiq