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All Journal INTERNATIONAL JOURNAL OF MECHANICAL COMPUTATIONAL AND MANUFACTURING RESEARCH UPMI Proceeding Series Journal
Telaumbanua, Safitiar
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EFFECT OF SMAW WELDING CURRENT VARIATIONS ON THE TENSILE STRENGTH OF ST 41 STEEL: PENGARUH VARIASI ARUS LAS SMAW TERHADAP KEKUATAN TARIK BAJA ST 41 Telaumbanua, Safitiar
UPMI Proceeding Series Vol. 2 No. 2 (2024): OKTOBER 2024
Publisher : LPPM UPMI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55751/ups.v2i2.319

Abstract

Dalam dunia industri baja sering digunakan akibatnya perkembangan ilmu dan penggunaannya pun semakin luas. Keilmuan yang dekat dengan baja salah satunya pengelasan, pengelasan ialah menyambungkan dua atau lebih logam dengan menggunakan panas. Baja memiliki kandungan karbon sehingga lebih mudah teroksidasi dan berkarat. Penelitian ini bertujuan untuk mengetahui pengaruh variasi arus las terhadap kekuatan tarik baja ST 40. Metode penelitian yang digunakan ialah metode ekperimen, dimulai dari persiapan benda uji sampai proses pengujian material. Pada penelitian ini dilakukan variasi pada kuat arus las SMAW dengan arus 80 A, 90 A, 100 A dan 110 A untuk kemudian dilakukan uji kekuatan tarik. Pada pengujian ini diperoleh hasil uji terbaik pada spesimen dengan variasi arus 100 A dengan nilai 470,11 Mpa. Dapat disimpulkan pada penelitian ini yaitu arus pengelasan paling baik bagi baja ST 40 pada arus 100 A dengan kekuatan tarik yang tinggi yang baik.
Comparative analysis of mechanical strength in aluminum welding joints of AA 5052 and AA 6061 plates Telaumbanua, Safitiar; Derlini, Derlini; Lubis, Yakmur
International Journal of Mechanical Computational and Manufacturing Research Vol. 14 No. 1 (2025): May: Mechanical Computational And Manufacturing Research
Publisher : Trigin Publisher

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Abstract

Oxy-Acetylene welding is a commonly used manual welding method due to its affordability and portability, as it does not require electricity. This process joins metal surfaces by heating them with a flame from burning a mixture of acetylene (C₂H₂) and oxygen (O₂), with or without filler metal, and without applying pressure. Aluminum, known for its lightweight, corrosion resistance, and good conductivity, is often alloyed with elements like Cu, Mg, Si, Mn, Zn, and Ni to enhance its mechanical properties. This study analyzes the mechanical properties and microstructure of Oxy-Acetylene welded aluminum alloys AA 5052 and AA 6061. Tests conducted include tensile, flexural (bending), and hardness tests. The tensile test showed AA 6061 had a higher tensile strength of 78.4 MPa, though still considered brittle due to the presence of weld defects. These defects were linked to the uneven melting and poor adhesion of the welding wire, resulting in gaps. The highest bending strength was also recorded by AA 6061 at 70.44 MPa with no fractures, while AA 5052 had the lowest at 50.1 MPa with fractures in the weld metal. Overall, Oxy-Acetylene welding on both materials showed imperfections due to inconsistent weld quality.
Co-Authors Derlini, Derlini Lubis, Yakmur