ANALISIS CACAT SAMBUNGAN BUTT JOINT PIPA CARBON STEEL A106 AKIBAT VARIASI ARUS PENGELASAN 2G SMAW MENGGUNAKAN METODE NDT PAUT

Masrohan, NIM 22DK50019 (2026) ANALISIS CACAT SAMBUNGAN BUTT JOINT PIPA CARBON STEEL A106 AKIBAT VARIASI ARUS PENGELASAN 2G SMAW MENGGUNAKAN METODE NDT PAUT. S1 thesis, UNUGHA Cilacap.

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Abstract

Sistem perpipaan bertekanan tinggi pada industri minyak dan gas menuntut kualitas sambungan las yang optimal. Penelitian ini menganalisis pengaruh variasi arus pengelasan SMAW (70A–130A) terhadap jenis, ukuran, dan distribusi cacat internal pada sambungan butt joint pipa ASTM A106 Grade B posisi 2G
menggunakan elektroda BOHLER E7018-H4R. Inspeksi dilakukan dengan Phased Array Ultrasonic Testing (PAUT) sesuai standar ASME Section V dan dievaluasi berdasarkan ASME B31.3. Hasil menunjukkan bahwa arus rendah (V1) menghasilkan 15 indikasi dengan dominasi cacat Planar (lack of fusion, incomplete
penetration) dan rejection rate 46,7%, sedangkan arus tinggi (V3) menghasilkan 11 indikasi didominasi cacat Volumetric (porosity cluster) dengan rejection rate 54,5%. Arus menengah (V2) menghasilkan indikasi paling sedikit (9 indikasi) dengan rejection rate 0%. Rentang arus optimal yang direkomendasikan adalah root 85A, hot pass 100A, filler 120A, dan capping 110A, dengan heat input berkisar 1,05–2 kJ/mm. Keyword: ASTM A106, Butt Joint, Cacat Las, Multi-Pass Welding, Phased Array Ultrasonic Testing (PAUT), SMAW, Variasi Arus.

Item Type: Thesis (S1)
Subjects: T Technology > TJ Mechanical engineering and machinery
Divisions: Fakultas Teknologi Industri > Prodi Teknik Mesin
Depositing User: Minnati Umdatul Istiqomah NITK7700014404
Date Deposited: 06 Aug 2026 06:30
Last Modified: 06 Aug 2026 06:30
URI: http://repo.unugha.ac.id/id/eprint/632

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