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All Journal Jurnal Teknologi Terapan Jurnal Metalurgi dan Material Indonesia
Winarto Winarto
Universitas Indonesia
Automotive Engineering Chemistry Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Repair Welding: Pengaruh Pengelasan Perbaikan Berulang dengan Kombinasi Proses GTAW dan SMAW terhadap Struktur Mikro dan Sifat Mekanik Baja Tahan Karat Dua Fasa Austenitik-Feritik (Duplex) UNS S31803 Febi Dwi Antony; Rini Riastuti; Winarto Winarto
Jurnal Metalurgi dan Material Indonesia Vol. 2 No. 2 (2019): Agustus
Publisher : Badan Kerja Sama Pendidikan Metalurgi dan Material (BKPMM)

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Abstract

During welding and also in the stages of fabrication and assembly, welding repair sometimes required to eliminate the welding defects present. This paper focuses on the effect of multiple repair welding on microstructure and mechanical properties of Duplex Stainless Steel UNS S31803. Three times welding repair were performed using combination of Gas Tungsten Arc Welding (GTAW) for root pass up to hot passes and Shielded Metal Arc Welding (SMAW) processes for fill passes up to finish passes. The average of heat input used was of 1.5-1.9 kJ/mm. After welding, the test samples were prepared for microhardness test, Charpy impact test, and microstructural examinations. The results showed that there was a significant reduction of Charpy toughness value due to welding process from 339.22 Joules for base metal to 89.22 Joules and 101.23 Joules for average weld metal and fusion zone consecutively. However, the toughness value between each welding repair showed same pattern with no significant reduction or increment of Charpy impact value. Same pattern also observed on microhardness measurement which revealed no significant fluctuation between each welding repair. Furthermore, the morphology of microstructure present in weld metal and heat affected zone area were also investigated to achieve more understanding regarding the effect of multiple repairs to the properties of Duplex weldment. Bearing in mind that at the moment, carrying out just one repair per welded joint especially for Duplex Stainless Steel is advised as the limiting condition.
EFEK GETARAN PADA PENGELASAN ALUMINUM 5083 H112 MENGGUNAKAN PROSES LAS GAS METAL ARC WELDING (GMAW) TERHADAP POROSITAS Imam Khoirul Rohmat; Winarto Winarto
Jurnal Teknologi Terapan Vol 4, No 2 (2018): Jurnal Teknologi Terapan
Publisher : P3M Politeknik Negeri Indramayu

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (871.661 KB) | DOI: 10.31884/jtt.v4i2.126

Abstract

5083 series aluminum magnesium is widely used for marine industrial. It is caused aluminum has high specific strength and good corrosion resistance. However, at process of welding many of porosity occured in the aluminum and it decrease the mechanical properties especially in HAZ (Heat Affected Zone). At casting process of aluminum, porosity could reduce by giving vibration. So, this method is tried to be applicated for welding of aluminum due to welding is a miniature of casting. Tensile test, hardness test, metallography test, and image analysis are technique to characterize the effect. As a result, vibration is not really affected the amount of porosity that occurred. But for hardness it is influenced especially for ER 4043 filler where the vibrated specimens have a higher hardness. The higher average result of tensile test for ER 5356 filler obtained at unvibrated specimens with the value is 231 MPa and for ER 4043 filler the higher average result obtained at vibrated specimen, the value is 226 MPa.
Co-Authors Febi Dwi Antony Imam Khoirul Rohmat Rini Riastuti, Rini