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All Journal Wahana Teknik
Agus Umartono
Program Studi Teknik Mesin, Fakultas Teknik, Universitas Gresik
Civil Engineering, Building, Construction & Architecture Engineering Mechanical Engineering

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ANALISA PERBANDINGAN PENGELASAN SAMBUNGAN SINGLE-V SUDUT KAMPUH 30º DAN 40º DENGAN 60º MENGGUNAKAN PROSES LAS FCAW TERHADAP SIFAT MEKANIS DAN EFISIENSI WAKTU PADA MATERIAL BAJA GRADE A Agus Umartono; Putri Sundari; Dian Maulana Habib Azhar
Wahana Teknik Vol 11 No 1 (2022): Wahana Teknik
Publisher : Wahana Teknik

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Penelitian ini bertujuan untuk mengetahui perbedaan kekuatan dan kelenturan material Grade A apabila dilaksanakan pengelasan menggunakan proses las FCAW dengan sudut kampuh 60º, 40º, dan yang paling kecil 30º, durasi yang diperlukan dalam menyelesaikan pengelasan dan kesulitannya dalam pelaksanaan pengelasan. Metode penelitian yang digunakan adalah eksperimen yang dilakukan pada beda uji dengan sudut kampuh 60º, 40º, dan 30º yang dilakukan pengelasan dengan parameter pengelasan yang sama meliputi penggunaan jenis kawat las, ampere, voltage, dan travel speed. Data hasil penelitian dianalisis dengan cara mengamati secara langsung benda uji kemudian disimpulkan dan ditentukan hasil penelitian. Hasil penelitian menunjukkan adanya sedikit perbedaan kekuatan tarik antara benda uji dengan sudut kampuh 60º, 40º, dan 30º. Specimen uji tarik sudut kampuh 60º memiliki kekuatan tarik rata-rata 48,45 kgf/mm2, Spesimen uji tarik sudut kampuh 40º memiliki kekuatan tarik rata-rata 43,30 kgf/mm2, dan Spesimen uji tarik sudut kampuh 30º memiliki kekuatan tarik rata-rata 43,01 kgf/mm2. Semua lokasi patahan uji tarik terputus di area logam dasar. Pada uji lengkung benda uji dengan sudut kampuh 60º, 40º, dan 30º tidak terdapat cacat terbuka. Durasi pengelasan yang dibutuhkan dalam menyelesaikan pengelasan sudut kampuh 60º selama 47,2 menit, sudut kampuh 40º selama 36,6 menit, dan sudut kampuh 30º selama 27,7 menit.
ANALISIS LAJU KOROSI PADA BAJA STAINLESS STEEL 304 YANG MENGALAMI PENGELASAN DAN BENDING 90 DERAJAT PADA AIR LAUT Agus Umartono; Mochammad Miftachul Choiri
Wahana Teknik Vol 11 No 2 (2022): wahana teknik
Publisher : Wahana Teknik

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Stainless steel or stainless steel is a metal that is widely used in the industrial world. One of them is the austenitic stainless steel group due to its corrosion resistance, weldability and ease of shaping, making it widely used in industry. Stainless steel that is included in the food grade category is stainless steel with a composition of 18/8 or 18/10. The meaning of this code indicates the composition of chromium and nickel content. Samples were immersed in seawater for 7 weeks. The study used 10 samples, namely sample 1 and sample 2 were samples that did not experience welding and did not experience bending, samples 3, 4, 5, and 6 were samples that experienced welding, and samples 7, 8, 9 and 10 were samples that experienced bending 90 °. From the 3 types of test methods, it can be concluded that those undergoing welding had a higher corrosion rate than the samples subjected to bending 90° and samples that were not welded and not subjected to bending had the lowest corrosion rates.
ANALISA LAJU KOROSI PADA PIPA CARBON STEEL A.106. GR.B PADA PROSES PRODUKSI MINYAK BUMI DI LEPAS PANTAI Meryanalinda; Agus Umartono; Mustafa Sihombing
Wahana Teknik Vol 11 No 2 (2022): wahana teknik
Publisher : Wahana Teknik

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In the production process of oil and gas, corrosion is one of the factors to considered in planning the pipe will be used to adjust to the needs of operation. In this study, the pipe material used in the oil and gas production process is A.106. GR.B. To prevent potential failure or damage during operation, the corrosion rate is monitored using the weight loss method with a coupon sample and also measuring the pipe wall thickness with Ultrasonic Thickness Measurement (UTM). The pipes taken as data are 4 production well pipes, namely Well Z2, Well Z3, Well Z4 and Well Z5. The results of data processing showed that the corrosion rate value on ell Z5 is 3.20 mpy, Z3 is 1.95 mpy, Z4 is 1.82 mpy and Z2 is 0.92 mpy. While the corrosion rate values obtained through calculation with pipe wall thickness measurements are well Z5 which 4.01 mpy, Z3 is 3.24 mpy, Z4 is 3.20 mpy and Z2 is 1.50 mpy. Base on the assessment of the corrosion rate with the two methods above, the key is that the corrosion rate by measuring the thickness of the pipe wall has a greater value due to external corrosion the occurs in the well pipe of the production process. From the results of the corrosion rate value obtained, well pipes that have greater corrosion value will have a shorter remaining pipe life.
Co-Authors Dian Maulana Habib Azhar Meryanalinda Mochammad Miftachul Choiri Mustafa Sihombing Putri Sundari