Article
Pengaruh Variasi Arus Pengelasan Pada Sambungan Fillet Stainless Steel-Carbon Steel dengan Metode Las TIG Terhadap Kualitas Sambungan
Enthalpy : Jurnal Ilmiah Mahasiswa Teknik Mesin, Vol. 11 No. 3 (2026), hlm. 222–234
Abstrak
Dissimilar metal welding between Stainless Steel 316 and ASTM A36 carbon steel is widely applied in industry due to its ability to combine excellent corrosion resistance and mechanical strength. Gas Tungsten Arc Welding (GTAW/TIG) is commonly used for joining dissimilar materials because it produces high-quality welds with excellent arc stability. However, studies investigating the effect of welding current variations on fillet weld joints between stainless steel and carbon steel using CHG 309L filler metal remain limited, particularly those evaluated through Non-Destructive Testing (NDT) and macrostructure examination. Therefore, this study aimed to analyze the effect of welding current variations on the weld quality of TIG-welded fillet joints between Stainless Steel 316 and ASTM A36 carbon steel. The welding process was carried out using current ranges of 160–170 A, 165–175 A, and 170–180 A with ER 309L filler metal. Weld quality was evaluated using Liquid Penetrant Testing (PT), Radiographic Testing (RT), and macrostructure testing. The PT results indicated that all specimens met the acceptance criteria without any surface defects. The RT results showed that specimen 1 was defect-free, while specimens 2 and 3 exhibited indications of lack of fusion measuring 3 mm and 2–6 mm, respectively; however, both specimens still satisfied the acceptance criteria. Macrostructure examination revealed penetration depths of 1.1 mm, 1.3 mm, and 0.4 mm for specimens 1, 2, and 3, respectively. The results demonstrated that welding current variation influenced weld joint quality, where the specimen welded at 165–175 A produced the highest penetration depth of 1.3 mm and exhibited the most optimal weld quality.