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All Journal JOURNAL OF MECHANICAL ENGINEERING, MANUFACTURES, MATERIALS AND ENERGY Jurnal Pendidikan Teknik Mesin Undiksha Jurnal Pendidikan dan Teknologi Indonesia
Budi Darsono, Febri
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Automotive Engineering Education Energy Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Pengaruh Penggunaan Magnet Eksternal dan variasi arus Pada Pengelasan TIG Terhadap Struktur Mikro, Kekerasan dan Kekuatan Tarik Baja Karbon Rendah : The Effect of Using External Magnets and Current Variations in TIG Welding on the Microstructure, Hardness and Tensile Strength of Low Carbon Steel Paundra, Fajar; Rakha Yudanta, Faturrizky; muhyi, andul; Pujiyulianto, Eko; Budi Darsono, Febri
Jurnal Pendidikan Teknik Mesin Undiksha Vol. 13 No. 1 (2025)
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jptm.v13i1.73571

Abstract

External magnetic fields can improve the quality of TIG welding results. This research aims to determine the effect of external magnetic fields in the TIG welding process. The material used in this research is SS400 steel. The welding process uses TIG (Tungsten Inert Gas) with varying currents of 70 A, 80 A, 90 A and 100 A and uses additional 2 Neodymium external magnets. Testing of welding results in the form of macro, micro structure, Vickers hardness test and tensile test. The macro structure test results show several welding defects such as porosity, incomplete penetration, underfill and distortion. Meanwhile, the results of microstructure testing show that the base metal contains ferrite and pearlite structures. The HAZ section contains ferrite, pearlite and martensite types of structures. The highest tensile test results were found in TIG welding connections without using a magnet with a current of 100 A, namely 368.234 MPa. The highest hardness test results were found in TIG welding joints using a magnet with a current of 100 A, namely 176,712 HVN. The use of external magnets can produce large penetration during the welding process and produce good welded joints. On the other hand, this can have a negative impact on the welding results if the distance between the electric arc and the material is not correct, and the torch does not move according to the welding path.
Characteristics of Profile Pin Variation in HDPE Friction Stir Welding to Mechanical Properties of Materials Agus Wahyu Setiawan; Budi Darsono, Febri; Kriswanto; Ramadhani, Riski
JOURNAL OF MECHANICAL ENGINEERING MANUFACTURES MATERIALS AND ENERGY Vol. 9 No. 2 (2025): December 2025 Edition
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jmemme.v9i2.15638

Abstract

Friction Stir Welding (FSW) is one of the Solid-State Welding processes, which joins materials below their melting point by continuously rubbing two workpieces together to generate heat. The FSW process heavily relies on the use of pin profiles, which play a crucial role in forming the weld joint, as they directly affect material flow in the weld zone and heat distribution during the welding process. This research aims to evaluate the mechanical properties of FSW joints made using different pin profile variations, in order to achieve high-quality welds. The study applies a descriptive statistical analysis approach, utilizing tensile testing, flexural testing, hardness testing, and macro photography. The material used in this research is High-Density Polyethylene (HDPE), with three types of pin profiles: triangular, threaded cylindrical, and grooved cylindrical. The welding parameters are kept constant: feed rate of 25 mm/min, spindle speed of 930 RPM, plunge depth of 3.84 mm, and tilt angle of 0°. The results show that the threaded pin profile produced the highest average values: hardness of 59.5 SHD, tensile strength of 11.5 MPa, and flexural strength of 22.4 MPa. In contrast, the grooved pin profile showed the lowest average values: hardness of 57.83 SHD, tensile strength of 4.99 MPa, and flexural strength of 4.22 MPa. The mechanical strength test results were influenced by weld defects observed through macro images. These weld defects significantly impacted the mechanical properties and demonstrated that pin profile geometry plays a vital role in heat generation through friction and in controlling the material flow dynamics, which directly determine the structural integrity and mechanical performance of the weld joint.
Pengaruh Feed Rate pada Friction Stir Welding Polypropylene Menggunakan Tool Aluminium 7075 Terhadap Kekuatan Tarik dan Lentur Masruhan, Fahmi Irsad; Budi Darsono, Febri; Kriswanto, Kriswanto; Sibro Malisi, Muhammad
Jurnal Pendidikan dan Teknologi Indonesia Vol 5 No 12 (2025): JPTI - Desember 2025
Publisher : CV Infinite Corporation

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52436/1.jpti.1278

Abstract

Friction Stir Welding (FSW) merupakan metode penyambungan fase padat yang efektif untuk material termoplastik seperti Polypropylene (PP), terutama dalam industri otomotif dan manufaktur ringan. Tantangan utama dalam penerapannya pada polimer adalah pengendalian parameter proses, Khususnya kecepatan pengelasan (feed rate), yang memengaruhi kualitas sambungan. Penelitian ini bertujuan untuk mengevaluasi pengaruh variasi feed rate terhadap kekuatan tarik dan lentur pada sambungan polypropylene yang dibentuk melalui proses friction stir welding (FSW). Proses dilakukan dengan menggunakan mesin frais, dengan tool berbahan aluminium 7075 dan pin silinder ulir. Variasi feed rate sebesar 15, 20, dan 25 mm/menit diterpakan dengan kecepatan putar konstan 1460 rpm dan sudut kemiringan 0°. Evaluasi dilakukan melalui pengujian tarik (ASTM D638), lentur (ASTM D790), serta pengamatan makro terhadap stir zone. Hasil menunjukkan bahwa feed rate 15 mm/menit menghasilkan stir zone yang paling homogen dengan cacat internal yang rendah dan kekuatan tarik tertinggi sebesar 13,485 MPa, setara efisiensi sambungan 44,06%. Sementara itu, kekuatan lentur tertinggi sebesar 15,179 MPa dicapai pada feed rate 25 mm/menit, dengan efisiensi lentur sebesar 32,1%. Feed rate tinggi cenderung menyebabkan cacat seperti void dan incomplete fusion akibat distribusi panas yang tidak merata serta plastisitas material yang tidak optimal. Penelitian ini berkontribusi pada pengembangan parameter friction stir welding untuk material polimer, khususnya melalui penerapan tool berbahan aluminium 7075 yang masih jarang dilaporkan dalam literatur dan dapat menjadi acuan untuk optimasi proses di sektor industri termoplastik.
Co-Authors Agus Wahyu Setiawan Kriswanto Kriswanto Kriswanto, Kriswanto Masruhan, Fahmi Irsad muhyi, andul Paundra, Fajar Pujiyulianto, Eko Rakha Yudanta, Faturrizky Ramadhani, Riski Sibro Malisi, Muhammad