Analisa Pengaruh Variasi Pre-Weld Heat Treatment dan Aging Post Weld Heat Treatment pada Sambungan Las Alumunium 6061 terhadap Kekuatan Tarik dan Struktur Makro

Tin Rachmatullah, Herman Pratikno, Hasan Ikhwani
Submission Date: 2020-08-07 11:56:29
Accepted Date: 2021-02-01 10:55:12

Abstract


Alumunium 6061 merupakan alumunium dengan komposisi paduan Al-Mg-Si sebagai paduan utama yang sering digunakan untuk material struktur lepas pantai dikarenakan kekuatan yang tinggi, ductility baik dan ketahanan korosi yang baik juga sifat mekanisnya ditingkatkan dengan cara heat treatment. Tujuan dari paper ini adalah untuk menunjukkan bagaimana pengaruh variasi perlakuan heat treatment berupa preheating dan aging post weld heat treatment pada sambungan las alumunium 6061 dengan proses GTAW terhadap kekuatan tarik dan struktur mikro dengan elektroda ER 5356. Adapun variasi suhu preheat adalah 80℃, 100℃, dan 120℃ dan variasi suhu aging post weld heat treatment 180℃ dan 260℃. Hasil penelitian didapatkan spesimen dengan perlakuan preheat 120℃ dan aging post weld heat treatment 260℃ memiliki ultimate strength terbesar yaitu 246,74 MPa dan yield strength sebesar 125,21 MPa. Serta HAZ terpanjang dimiliki spesimen perlakuan preheat 120℃ dan aging PWHT 260℃ dengan lebar HAZ sepanjang 3,5 mm.

Keywords


Alumunium 6061; Preheating; Aging; Post Weld Heat Treatment, Gas Tungsten Arc Welding.

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