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All Journal Jurnal POLIMESIN JTT (Jurnal Teknologi Terapan)
Amelia Rahmatika
Institut Teknologi Sains Bandung
Automotive Engineering Computer Science & IT Control & Systems Engineering Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology

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Studi pengaruh variasi kuat arus terhadap sifat mekanik hasil Pengelasan GTAW alumunium 1050 dengan filler ER 4043 Amelia Rahmatika; Setiani Ibrahim; Megarini Hersaputri; Ely Aprilia
Jurnal POLIMESIN Vol 17, No 1 (2019): Februari
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (563.286 KB) | DOI: 10.30811/jpl.v17i1.731

Abstract

Industri manufaktur di Indonesia sedang mengalami perkembangan yang sangat pesat. Perkembangan industri manufaktur sangat erat kaitannya dengan proses penyambungan logam melalui teknik pengelasan. Material Aluminium dan paduannya adalah salah satu jenis logam yang banyak digunakan dalam industri karena memiliki beberapa keunggulan sifat, diantaranya adalah ringan dan memiliki ketahanan korosi yang baik. Namun kelemahan material ini yaitu sukar untuk dilas. Penentuan parameter las sangat penting dalam proses pengelasan. Kuat arus las merupakan salah satu parameter proses pengelasan yang akan mempengaruhi sifat mekanik hasil lasan. Penelitian ini dilakukan untuk mengetahui sifat mekanik sambungan las Aluminium 1050 menggunakan paramater kuat arus dengan variasi nilai kuat arus yaitu 125 A, 150 A, dan 175 A. Metode pengelasan yang diterapkan pada penelitian ini adalah pengelasan GTAW dengan ER 4043 sebagai logam pengisinya. Pengujian kekuatan tarik dan pengujian kekerasan telah dilakukan untuk mengetahui pengaruh variasi kuat arus terhadap sifat kekuatan tarik dan kekerasan pada sambungan lasan. Berdasarkan pengujian tarik, kekuatan tarik tertinggi dicapai pada kuat arus 125 A dengan nilai 81,8 MPa. Hasil pengujian mikro Vickers menunjukkan bahwa nilai kekerasan pada daerah lasan selalu lebih besar dibandingkan nilai kekerasan di daerah HAZ dan logam induk untuk setiap kuat arus. Nilai kekerasan tertinggi pada daerah lasan sebesar 69 HV diperoleh pada kuat arus terbesar yaitu 175 A.Kata Kunci : Aluminium 1050, Pengelasan GTAW, Kuat Arus, Kekerasan, Kuat Tarik.  AbstractThe manufacturing industry in Indonesia is experiencing very rapid development. The development of the manufacturing industry is very closely related to the process of connecting metals through welding. Aluminum material and its alloys are one type of metal that is widely used in industry because it has several advantages in properties, including being lightweight and having good corrosion resistance. But the weakness of this material is that it is difficult to weld. Determination of welding parameters is very important in the welding process. Welding current strength is one of the welding process parameters that will affect the mechanical properties of welds. This study was conducted to determine the mechanical properties of aluminium 1050 welded joints using current strength parameters with variations in the current strength of 125 A, 150 A, and 175 A. The welding method applied in this study is GTAW with ER 4043 as its filler metal. Tensile strength testing and hardness testing have been carried out to determine the effect of strong current variations on the properties of tensile strength and hardness in weld joints. Based on tensile testing, the highest tensile strength was achieved at 125 A current with a value of 81.8 MPa. The Vickers micro test results show that the hardness value in the weld area is always greater than the hardness value in the HAZ region and the parent metal for each current strength. The highest hardness value in the weld area of 69 HV is obtained at the largest current strength of 175 A. Keywords : Aluminium 1050, GTAW welding process, Welding current strength, Hardness, Tensile strength test.
ANALISIS SAMBUNGAN LAS GMAW BAJA ASTM A36 YANG TERPAPAR PANAS TINGGI DAN PENDINGINAN CEPAT Nurudin Nurudin; Alfi Tranggono Agus Salim; Indarto Yuwono; Amelia Rahmatika; Suparman Suparman
Jurnal Teknologi Terapan Vol 8, No 2 (2022): Jurnal Teknologi Terapan
Publisher : P3M Politeknik Negeri Indramayu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31884/jtt.v8i2.436

Abstract

Fires in steel construction, especially in welding joints, cause damage, changes in crystal structure, and mechanical properties of the material. Another effect of the fires, the material undergoes rapid cooling due to extinguishing using water. This research aims to simulate fires on ASTM A36 steel material to analyze the impact of fires. The method of this research is to perform GMAW welding on A36 steel material with heat treatment at 400 °C unti 700 °C and rapid cooling using water. The results of the research are the mechanical properties of the material in the form of crystal structure, hardness level and ultimate tensile strength. The crystal structure of ferrite and pearlite was observed, there was a change in structure, namely coarse ferrite, fine ferrite, and a mixture of bainite martensite. The highest hardness values of coupons temperature is 550 °C until 700 °C, comparison coupons, and coupons temperature at 400 °C-550 °C, which value 169,3 HV, 166.3 HV, and 141,3 HV in the weld zone. Tensile test fractures on the base metal with the ultimate tensile strength coupon with temperature 550 until 700 °C of 481,75 N/mm², the comparison coupon of 478,5 N/mm², and the temperature coupon of 400 until 550 °C which is 456 N/mm². The material is ductile.
Co-Authors Alfi Tranggono Agus Salim Ely Aprilia Indarto Yuwono Megarini Hersaputri Nurudin Nurudin Setiani Ibrahim Suparman Suparman