Zafii, Ahmad (2017) PENGARUH VARIASI GAP DAN KUAT ARUS PADA SAMBUNGAN SQUARE GROOVE TERHADAP KUAT TARIK, KEKERASAN, DAN METALLOGRAPHY. Diploma thesis, POLITEKNIK PERKAPALAN NEGERI SURABAYA.
Full text not available from this repository.Abstract
ABSTRAK Pengelasan kapal pada PT X, desain sambungan pengelasan yang digunakan adalah square groove. Namun WPS yang dipakai V groove. Pemilihan gap dan arus penegelasan sangat bervariasi. Menurut standard AWS D1.1, Lebar gap menggunakan square groove joint harus sama dengan tebal material yang dilas. Penelitian ini bertujuan untuk mengetahui pengaruh variasi gap ( 5 mm, 7 mm, 9 mm) dan arus ( 110 A, 150 A, 190 A ) terhadap kuat tarik, kekerasan, dan metallography. Penelitian dilakukan dengan cara melakukan pengelasan proses FCAW pada material BKI grade A dengan elektroda E71T-1C dan shielding gas CO 2 . Pengujian yang dilakukan adalah tensile test, hardness vickers test, makro etsa, dan mikro etsa. Hasil pada pengujian tarik dan kekerasan dilakukan analisa dengan metode ANOVA, sedangkan struktur mikro menggunakan metode Planimetri Jeffrie. Berdasarkan hasil dan analisa data yang dilakukan, gap dan arus las dapat merubah sifat mekanik dan struktur mikro pada material BKI Grade A. Semakin besar arus dan lebar gap maka masukan panas (heat input) akan semakin besar hal ini menyebabkan kuat tarik naik, kekerasan naik, dan luasan HAZ bertambah, namun diameter grain size turun. Berdasarkan analisa ANOVA gap dan arus las berpengaruh signifikan terhadap kuat tarik, namun tidak pada nilai kekerasan. Kata Kunci : BKI grade A, FCAW, Tensile , Hardness, Metallography ABSTRACT Welding process on shipbuilding in PT X, usually the design of welding joints was square groove. But the WPS used was V groove. The selection of gaps and currents were vary. According to AWS D1.1 standard, the width of gap using for square groove joint should be equal to the thickness of the material. The objectives of this study were to determine the effect of gap variation (5 mm, 7 mm, 9 mm) and current (110 A, 150 A, 190 A) on tensile strength, hardness, and metallography. The research was conducted by FCAW welding process on BKI grade A material with E71T-1C electrode and shielding gas CO2. The tests conducted are tensile test, hardness vickers test, macro etching, and microstructure etching. The results of tensile and hardness test were analyzed by ANOVA method, while the microstructure by Jeffrie Planimetri method. Based on the results and data analysis, gap and current influenced the mechanical properties and microstructure of BKI Grade A material. The larger the current and the gap, the higher the heat input, so it would cause the tensile strength, hardness, and HAZ area Increased, but the diameter of the grain size decreases. Based on ANOVA analysis gap and welding current have significant effect to tensile strength, but none on hardness Keyword : BKI grade A, FCAW, Tensile , Hardness, Metallography
| Item Type: | Thesis (Diploma) |
|---|---|
| Subjects: | T Technology > T Technology (General) |
| Divisions: | Jurusan Teknik Bangunan Kapal > D4 Teknik Pengelasan |
| Depositing User: | Unnamed user with email repository@ppns.ac.id |
| Date Deposited: | 05 Oct 2018 06:13 |
| Last Modified: | 05 Oct 2018 06:13 |
| URI: | http://repository.ppns.ac.id/id/eprint/1343 |
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