AbstrakTujuan dari penelitian ini adalah menentukan spesimen uji agar bisa diterima berdasarkan acceptance criteria ASME. Penelitian ini menggunakan material mild steel dengan nilai kekerasan 135 HVN dengan ukuran 30 cm x 20 cm x 1,2 cm yang disambungkan dengan proses pengelasan SMAW posisi 3G buttjoint dengan elektroda rooting LB 52U diameter 2.6 mm menggunakan arus 70 Amper dan tegangan 380 volt, sedangkan untuk filler menggunakan elektroda LB 5218 diameter 3,2 mm dengan arus 80 Amper dan tegangan 380 volt. Pada proses pengelasan banyak hal terjadi yang dipengaruhi oleh banyak faktor baik yang sengaja maupun yang tidak disengaja. Metode untuk menginspeksi hasil lasan salah satunya dengan uji tidak merusak metode dye penetrant (NDT-PT) yang hasilnya akan ditentukan berdasarkan acceptance criteria berdasarkan standar ASME. Hasil pengujian menunjukkan adanya discontinuity berupa adanya porositas pada permukaan hasil pengelasan pada spesimen 1 terdapat rounded terbesar 5 mm pada jarak 233 mm sehingga berdasarkan acceptance criteria standar AWS dinyatakan hasil pengelasan tersebut accepted dan pada spesimen 2 terdapat discontinuity pada jarak 233 mm dengan ukuran 8 mm sehingga dinyatakan rejected. Hasil rejected ini dapat diperbaiki dengan cara di gouging pada discontinuity tersebut kemudian dilakukan pengelasan.
Kata Kunci: NDT-PT, SMAW, Butt Joint, ASME
AbstractThe purpose of the research are determine acceptance criteria the specimen based on ASME standard.
Portable vacuum grain conveyor (PVGC) work as transporting grain materials such as grain, wheat, sorghum, corn and its kind using air media. The advantages of this machine are that it can move material quickly, the material does not fall in the transportation process, it can move from the bottom to the top or vice versa, it does not require a feed hopper, and the machine can move places. How the PVGC machine works by utilizing the suction and thrust of a vacuum blower. The seed material is sucked in by the input hose and then into the cyclone to separate the air and seed material. Air from the cyclone enters the vacuum blower through the input hole and is blown into the output line to push the material falling from the cyclone through the rotary airlock. Seed material out through the output hose is directed to the desired place. Performance testing of the PVGC engine includes noise, the air suction speed of the input hose and the thrust speed of the output hose, the engine capacity, and thermal testing. The highest noise test results in the electric vacuum blower motor was 95.5 dBA ±1, the air suction speed at the input hose was 38 m/s ±3, the air thrust speed at the output hose was 44 m/s ±2, the capacity of the PVGC machine could transport IR64 of grain type with weighing 88 kg/minute. The hottest component was in the vacuum blower with a temperature of 52.50C.
In the metal machining process, especially in the milling process, the parameters that affect the quality milling process results are cooling media because it affects the tool life used. This paper aims to determine the performance of using fan chips as the coolant in the dry milling process area. The method used is the computational fluid dynamic (CFD) method and the experimental milling process on a workpiece made from aluminum alloy 5086. In experimental testing using a variation of the milling machine spindle rotation. The simulation test results on the fluid flow character on fan chips with a protector producing a central character with a small area. In contrast, fan chips without a protector make a central character with a broader area. The wind speed data in simulation testing and experimental testing produced the same trend graph. The results of the performance of fan chips after experimented with variations in spindle rotation, cooling process on area occurs when the motor spindle rotates above 1120 Rpm on the fan chips with a protector, and the engine spindle rotates above 770 Rpm on the fan chips without a protector. The effect of fan chips on tool life affects increasing tool life by 8 minutes on installing fan chips with a protector and increasing tool life by 12 minutes on installing fan chips without a protector.
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