ANALISIS PROSES PENGELASAN REPLATING LAMBUNG KAPAL PADA KONDISI FLOATING TERHADAP NILAI KEKERASANNYA
PENGELASAN LAMBUNG KAPAL
DOI:
https://doi.org/10.30871/jatra.v7i2.10850Kata Kunci:
Replating, Floating, Cooling Rate, KekerasanAbstrak
Replating kapal merupakan suatu hal penting dalam hal perbaikan kapal agar tetap dapat beroperasi sesuai fungsinya. Replating dapat dilakukan kondisi docking, serta dapat juga dilakukan kondisi floating. Laju pendinginan proses pengelasan kondisi floating berbeda dengan laju pendinginan pada pengelasan kondisi docking, sehingga hal tersebut mempengaruhi sifat mekanis dari material. Penelitian ini menggunakan empat variasi jarak antara garis las dengan garis air yaitu 30 mm, 60 mm, 100 mm, dan 130 mm, dan empat variasi temperatur air yaitu 25˚C, 28˚C, 30˚C dan 32˚C, yang nantinya akan dibandingkan hasilnya dengan pengelasan kondisi di darat. Pengujian kekerasan dilakukan untuk mengetahui sifat mekanis material. Hasil pengujian kekerasan menunjukkan bahwa terjadi penurunan nilai kekerasan pada setiap kenaikan variasi jarak garis air dengan garis las dan variasi temperatur air. Nilai kekerasan untuk seluruh variasi yang dilakukan pada penelitian ini memenuhi standard BKI. Sehingga berdasarkan penelitian ini, pengelasan dalam kondisi floating dengan minimal jarak antara garis air dengan garis las sebesar 30 mm, dan temperatur air antara 25˚C - 32˚C, dapat diaplikasikan dilapangan.
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Referensi
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