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All Journal Transmisi Ideguru: Jurnal Karya Ilmiah Guru Sinergi Polmed : Jurnal Ilmiah Teknik Mesin Prosiding Simposium Nasional Rekayasa Aplikasi Perancangan dan Industri
Widyastuti, Ike
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Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Other

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PENGGUNAAN X-RAY DIFRACTION DAN SOFTWARE PCPDFWIN UNTUK KARAKTERISASI SENYAWA DEPOSIT HASIL PELAPISAN ELECTOLESS NICKEL PHOSPHORUS Widyastuti, Ike
TRANSMISI Vol 3, No 1 (2007): Edisi Pebruari 2007
Publisher : University of Merdeka Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26905/jtmt.v3i1.4460

Abstract

Salah satu karakterisasi hasil pelapisan Electoless Nickel Phosphorus dilakukan menggunakan X-RayDiffraction (XRD) untuk mengetahui deposit yang terjadi di permukaan logam substrat.Hasil proses Electoless Nickel Phosphorus ini adalah deposit unsur Ni dan P tanpa terjadi difusi sehinggakekerasan yang rendah. Untuk itu perlu dilakukan proses perlakuan panas sehingga difusi dapat terjadiantara Ni dan P yang menghasilkan fasa atau senyawa Ni3P yang merupakan fasa keramik dan bersifatkeras berdasarkan analisa hasil pengujian XRD menggunakan alat bantu software PCPDFWIN.
Analysis of The Effect of Post Weld Heat Treatment (PWHT) on The Hardness and Corrosion Rate of SMAW Welded Joints on AISI 304 Plates Diantoro, Helga; Jumiadi, Jumiadi; Widyastuti, Ike
TRANSMISI Vol 20, No 1 (2024): March 2024
Publisher : Universitas Merdeka Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26905/jtmt.v20i1.12716

Abstract

Post-welding heat treatment (PWHT) is a heat treatment of steel that has undergone welding. The purpose of doing PWHT is to improve the properties of the material itself. Such as uniforming the microstructure, reducing residual stresses, and improving corrosion resistance. In this study the authors conducted a shielded arc welding (SMAW) welding experiment on an AISI 304 steel pelate which had a thickness of 8 mm, a width of 150 mm, and a length of 200 mm. AISI 304 is a type of austenitic stainless steel. The type of seam used is the v seam with an angle of 60˚ and a root face of 2 mm. As for the welding process, it was carried out in the 1G position, using an E308S-15 electrode with a diameter of 2 mm, and a current of 60 A. From the welding carried out on the AISI 304 pelate, then cuts were made to divide the steel into 10 specimens, with a width of 10 mm, a thickness of 8 mm, and 60 mm long. PWHT was carried out with temperature variations of 1100˚C, 900˚C and 700˚C for 15 minutes, and cooled using water as the medium. Conclusions that can be drawn from this research, among others; (1) From the PWHT process carried out at temperatures of 1100˚C, 900˚C and 700˚C. Temperature of 1100˚C can reduce carbide deposition in the weld metal, HAZ and base metal areas, (2) The highest level of hardness occurs in the weld metal area without PWHT of 111.7 HRB, while the lowest hardness level occurs in the HAZ area with PWHT of 1100˚C as big as 95.6 HRB. (3) The highest corrosion rate occurred at PWHT 700˚C of 0.429 mm/y, while the lowest corrosion rate occurred at PWHT 1100˚C of 0.073 mm/y.
Failure Analysis of Galvanized Iron Pipe at Perumda Tirta Kanjuruhan Pramita, Cynthia Rosa; Suprapto, Agus; Widyastuti, Ike
TRANSMISI Vol 19, No 2 (2023): September 2023
Publisher : Universitas Merdeka Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26905/jtmt.v19i2.12015

Abstract

The most commonly used type of water pipe is iron pipe or commonly called Galvanized Iron pipe. The disadvantage of GI pipe is that it rusts easily. So it can result in degradation, decreased efficiency and construction, poor water quality, and higher maintenance costs. Water channeled through rusty pipes will pollute the water and adversely affect the health of those who consume it. This study aims to determine the factors causing failures of GI pipe in the distribution pipeline that have failed due to corrosion. The tested pipes is 1/2"ᴓ sized, 5-year-old corroded pipe whose distribution uses a gravity system and a pumping system. To support this analysis, operational data on fluid and environmental conditions around the pipeline are needed, observations on macro and micro structures, and hardness testing. The corrosion rate is calculated through the thickness loss method and the corrosion rate in the gravity system is 0.153 mm / year that higher than pipe in pumping system. Microstructure observations support the characterization of the material that this pipe is a mild steel, where this type of steel has a high Fe content so it is vulnerable to corrosion attacks. Rockwell hardness testing showed that the corrosion rate is directly proportional to the hardness value of the pipeline. The results of the analysis show that the environment around the pipe which has low soil resistivity and high humidity levels is the main factor in the occurrence of uniform corrosion of the pipe. The selection of inappropriate materials is also supportive as the cause of corrosion occurring.
Co-Authors Agus Suprapto Dartim Darto, D Diantoro, Helga Jumiadi, Jumiadi Kurniawan, Pradhana Lestari, Dicky Candra Pramita, Cynthia Rosa Rudi Hariyanto Widiharsa, Fransiskus A.